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## **Meet the editors**

Dr Sai Praveen Haranath is a physician working at Apollo Hospitals, Hyderabad, India and is also part of one of the first Tele ICU programs in India. He did his MBBS at Madras Medical College and then went to the USA. Over 15 years in America he specialized Internal Medicine, Pulmonary and Critical Care Medicine and is American Board Certified in these fields. His training and employment included the University of Connecticut, Loyola University, Oregon Health and Science University and numerous other hospitals. He also obtained a Masters in Public Health degree. He is a Fellow of the American College of Chest Physicians and is on the steering committee of the Disaster Response Network, the Occupational and Environmental Diseases Network, and also part of the Marketing Committee of this global organization. He returned to India in 2011 to pursue his lifelong desire to raise the standard of Indian and global healthcare through the ethical practice of excellent medicine. He has expertise in fiberoptic bronchoscopy and advanced bronchoscopic procedures. His prior experience in rural, community and academic settings in the USA and most recent engagement at The Permanente Medical Group/ Kaiser Permanente in the San Francisco area and his current position at Apollo Hospitals in Hyderabad have given him experience in pulmonary medicine and bronchoscopic procedures.

Dr Samiya Razvi obtained her medical degree and Diploma in Child Health from Christian Medical College and Hospital, Vellore, India. She has experience in clinical research at the All India Institute of Medical Sciences New Delhi and in basic science research at the Department of Clinical Immunology, Mount Sinai Medical Center, New York. Dr Razvi trained in Pediatrics at Long Island College Hospital and Beth Israel Medical Center, New York. Following residency, she completed a 3-year fellowship in Pediatric Pulmonology at the Morgan Stanley Children's Hospital of New York Presbyterian, Columbia University, New York. She obtained Board Certification in Pediatrics from the American Board of Pediatrics and subspecialty board certification in Pediatric Pulmonology, American Board of Pediatrics. Her keen interest in clinical research led her to pursue and obtain a Master's degree in Biostatistics, Patient Oriented Research Track in 2007, from the Mailman School of Public Health, Columbia University, New York. Dr Razvi worked as Staff Pediatric Pulmonologist at Children's Hospital at Cleveland Clinic, Ohio, where in addition to clinical responsibilities, she actively participated in resident and trainee teaching and as a mentor in research. She was awarded the Teacher of the Year, 2008 at the Pediatric Institute, Children's Hospital at Cleveland Clinic. Currently, she is Consultant Pediatric Pulmonologist at Apollo Hospitals, Jubilee Hills,Hyderabad, India. She continues to be involved in teaching and mentoring post-graduate trainees and is the Chairman of the Thesis Committee for post-graduateresearch. Dr Razvi's areas of clinical interest are pediatric asthma, lung disease of prematurity, cystic fibrosis and pediatric flexible bronchoscopy.

Contents

**Preface IX** 

**Section 1 Basics of Bronchoscopy 1** 

Chapter 1 **Role of Flexible-Bronchoscopy in** 

and Thomas B. Zanders

**Section 2 Bronchoscopic Investigations 55** 

Mohammad Shameem

Chapter 5 **Bronchoscopy in** 

Angel Estella

Chapter 7 **Endotracheal Intubation with** 

Chapter 4 **Lung Cancer – CT Vs Bronchoscopy 71** 

**Section 3 Bronchoscopy in Special Situations 89** 

Chapter 2 **Monitoring, Sedation, and Anesthesia** 

Michael J. Morris, Herbert P. Kwon

Chapter 3 **Role of Broncoalveolar Lavage in Diagnosis 57** 

António Saraiva and Christopher Oliveira

**Mechanically Ventilated Patients 91** 

**Section 4 Evolving Therapeutic Uses of Bronchoscopy 125** 

**Flexible Fiberoptic Bronchoscope (FFB) in Cases of Difficult Airway 127**  Francisco Navarro, Raúl Cicero and Andrea Colli

Chapter 6 **Bronchoscopy in Bronchiectasis and Cystic Fibrosis 107**  Aditya Kasarabada, Mark E. Lund and Jeffrey B. Hoag

**Pulmonary and Critical Care Practice 3** 

**for Flexible Fiberoptic Bronchoscopy 35** 

Gilda Diaz-Fuentes and Sindhaghatta K. Venkatram

### Contents

#### **Preface XI**


X Contents


Chapter 9 **Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 151**  Rosa Mastropierro, Michela Bettinzoli and Aldo Manzato

#### **Section 5 Pediatric Bronchoscopy 175**


### Preface

Bronchoscopy has become an essential part of modern medicine. Recent advances in technology have allowed integration of ultrasound with this tool. The use of lasers along with bronchoscopes has increased the therapeutic utility of this device. Globally an increasing number of pulmonary specialists, anaesthesiologists and thoracic surgeons are using the bronchoscope to expedite diagnosis and treatment. The current volume on bronchoscopy adds to the vast body of knowledge on this topic. The contributions from around the world cover the breadth of this field and include cutting edge uses as well as a section on pediatric bronchoscopy.

This was a tough job for me as an editor of the book, since the authors wrote vast and extensive chapters . It was a great experience. I would request readers to review the book and suggest areas for modification or further topic additions for future versions. Every care has been taken to ensure the accuracy of information and authors are aware of the strict rules against plagiarism. The book is divided in various sections in order to make it easier for the beginner, as well as the advanced reader to have a rapid overview of this topic. The section on pediatric bronchoscopy highlights issues specific to children that are recognizably different from adults, including airway anatomy, anesthesia considerations and the emerging field of diagnostic and therapeutic procedures in this age group. A major indication for bronchoscopy in infants and young children continues to be evaluation for congenital airway malformations, and both common and uncommon disorders are reviewed with illustrations in this text.

As a pulmonary and critical care physician it has been fulfilling to see the chapters on special areas like bronchoscopy in bronchiectasis as well as in the intensive care unit. Practical uses like managing and monitoring the airway during percutaneous tracheostomy performance has an entire chapter devoted to this evolving topic . In summary, this book is a great testament to the power of collaboration and is a superb resource for doctors in training, ancillary team members as well as practicing healthcare providers who have to perform or arrange bronchoscopy or the similar procedures. I would like to sincerely thank my associate editor Dr Samiya Razvi for ensuring the pediatric section to integrate well into this comprehensive book. I am grateful to InTech as well as Jana Sertic, my coordinator, for her patient yet firm requests for expediting this book. I hope the readers will find this book enjoyable for

#### X Preface

reading and that they will recignize a contemporary source of knowledge in our book.

#### **Dr. Sai Praveen Haranath**

Consultant Pulmonologist and Critical Care Medicine Specialist, Axon Anesthesia Associates, Hyderabad, Apollo Hospitals, Jubilee Hills, Hyderabad, India

#### **Dr. Samiya Razvi**

Consultant Pediatric Pulmonologist, Apollo Hospitals, Jubilee Hills, Hyderabad, India

X Preface

book.

reading and that they will recignize a contemporary source of knowledge in our

Consultant Pulmonologist and Critical Care Medicine Specialist,

**Dr. Sai Praveen Haranath** 

India

India

**Dr. Samiya Razvi** 

Axon Anesthesia Associates, Hyderabad, Apollo Hospitals, Jubilee Hills, Hyderabad,

Consultant Pediatric Pulmonologist, Apollo Hospitals, Jubilee Hills, Hyderabad,

**Section 1** 

**Basics of Bronchoscopy** 

## **Section 1**

**Basics of Bronchoscopy** 

**1** 

*USA* 

**Role of Flexible-Bronchoscopy in** 

Gilda Diaz-Fuentes and Sindhaghatta K. Venkatram

*Division of Pulmonary and Critical Care Medicine, Bronx Lebanon Hospital Center, Bronx, New York* 

**Pulmonary and Critical Care Practice** 

The introduction of the flexible bronchoscope by Dr. Ikeda in 1968 revolutionized bronchoscopy around the world. Initially, bronchoscopy was performed by surgical specialists with a rigid scope only in highly specialized centers, and the main indication was for therapeutic purposes. In the 1970s, flexible fiberoptic bronchoscopy (FFB) was learned by pulmonologists and surgical specialists and proved itself as a safe and useful technique for diagnostic and therapeutic purposes. The results have been a rapid proliferation of FFB

In the armamentarium of the pulmonary physician, FFB assumes a central position that is somewhere between the noninvasive diagnostic maneuvers such as physical examination, laboratory study, pulmonary function testing and radiologic diagnostics on one side and invasive surgical procedures such as mediastinoscopy and diagnostic thoracotomy on the

A recent trend has been the emergence of "interventional bronchoscopy" and the "interventional bronchoscopist". These phrases denote a two-tier system in which one group of bronchoscopists perform "routine bronchoscopy" and the other performs special bronchoscopic procedures. Disease processes encompassed within this discipline include complex airway management problems, benign and malignant central airway obstruction, pleural diseases, and pulmonary vascular procedures. Diagnostic and therapeutic procedures pertaining to these areas include, but are not limited to, rigid bronchoscopy, transbronchial needle aspiration (TBNA), auto fluorescence bronchoscopy, endobronchial ultrasound (EBUS), transthoracic needle aspiration (TTNA) and biopsy, laser bronchoscopy, endobronchial electrosurgery, argon-plasma coagulation, cryotherapy, airway stent insertion, balloon bronchoplasty and dilatation techniques, endobronchial radiation, photodynamic therapy, percutaneous dilatational tracheotomy, transtracheal oxygen catheter insertion, medical

Considering the prominence of FFB in the procedural armamentarium of pulmonary physicians (among other specialties) and the new developments of interventional bronchoscopy, it is important for the non-interventional pulmonologist and physician in

thoracoscopy, and imaging-guided thoracic interventions. (Anders et al. 1988)

pulmonary training to have a clear understanding of the role of FFB.

**1. Introduction** 

other side.

inside and outside of the academic institutions.

## **Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice**

Gilda Diaz-Fuentes and Sindhaghatta K. Venkatram *Division of Pulmonary and Critical Care Medicine, Bronx Lebanon Hospital Center, Bronx, New York USA* 

#### **1. Introduction**

The introduction of the flexible bronchoscope by Dr. Ikeda in 1968 revolutionized bronchoscopy around the world. Initially, bronchoscopy was performed by surgical specialists with a rigid scope only in highly specialized centers, and the main indication was for therapeutic purposes. In the 1970s, flexible fiberoptic bronchoscopy (FFB) was learned by pulmonologists and surgical specialists and proved itself as a safe and useful technique for diagnostic and therapeutic purposes. The results have been a rapid proliferation of FFB inside and outside of the academic institutions.

In the armamentarium of the pulmonary physician, FFB assumes a central position that is somewhere between the noninvasive diagnostic maneuvers such as physical examination, laboratory study, pulmonary function testing and radiologic diagnostics on one side and invasive surgical procedures such as mediastinoscopy and diagnostic thoracotomy on the other side.

A recent trend has been the emergence of "interventional bronchoscopy" and the "interventional bronchoscopist". These phrases denote a two-tier system in which one group of bronchoscopists perform "routine bronchoscopy" and the other performs special bronchoscopic procedures. Disease processes encompassed within this discipline include complex airway management problems, benign and malignant central airway obstruction, pleural diseases, and pulmonary vascular procedures. Diagnostic and therapeutic procedures pertaining to these areas include, but are not limited to, rigid bronchoscopy, transbronchial needle aspiration (TBNA), auto fluorescence bronchoscopy, endobronchial ultrasound (EBUS), transthoracic needle aspiration (TTNA) and biopsy, laser bronchoscopy, endobronchial electrosurgery, argon-plasma coagulation, cryotherapy, airway stent insertion, balloon bronchoplasty and dilatation techniques, endobronchial radiation, photodynamic therapy, percutaneous dilatational tracheotomy, transtracheal oxygen catheter insertion, medical thoracoscopy, and imaging-guided thoracic interventions. (Anders et al. 1988)

Considering the prominence of FFB in the procedural armamentarium of pulmonary physicians (among other specialties) and the new developments of interventional bronchoscopy, it is important for the non-interventional pulmonologist and physician in pulmonary training to have a clear understanding of the role of FFB.

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 5

Protected-specimen brushing is a telescoping plugged catheter passed through the suction channel of the bronchoscope. Once beyond the tip of the scope, the internal sheet is extended, its gelatin plug expelled, and the sterile brush is dipped into either the visible airway secretions or passed more distally into the involved pulmonary segment. The brush is retrieved by reversal of the process, and then cut into a sterile container with 1mL of buffer or broth. In the microbiology laboratory, the sample is quantitatively cultured. Most investigators use the cutoff of 103 cfu/ml for differentiation of infection from contamination. The main value of PSB is for the diagnosis of bacterial pneumonia; therefore, only quantitative culture and

The bronchial brush catheter is inserted in a similar way as the PSB. The cytology brush is stiffer than the PSB, so it makes it easier to obtain cellular material from the airway wall. The main indication for bronchial brushes is for the cytologic diagnosis of malignancies or viral

In comparison to bronchial washing, BAL samples a much larger airway and alveolar area. It is estimated that approximately 1 million alveoli (1% of the lung surface) are sampled, with approximately 1 ml of actual lung secretions returned in the total lavage fluid. Bronchoalveolar lavage requires careful wedging of the tip of the bronchoscope into the desired airway lumen, isolating that airway from the rest of the central airways. Wedging is defined as the position where the scope cannot be advanced while the distal lumen is still visible. Then, normal saline in 30 to 60 ml aliquots are instilled two or three times and after 2 respiratory cycles the fluid is intermittently suctioned out to a trap with low suction. The first 20 ml which are secretions found in the subsegmental bronchus is usually discarded as this is not representative of alveolar lavage The returned volume varies with the amount instilled but is generally 10 to 100 ml. The number of lavages needed is based on return and the number of tests ordered. In our institution

Bronchoalveolar lavage has been proven to be very safe and can be done without fluoroscopy. The diagnostic threshold for BAL fluid has been reported to be 104 cfu/ml for quantitative and 105 for non-quantitative cultures. Bronchoalveolar lavage is the mainstay of bronchoscopic diagnosis in the immunosuppressed patient when looking for an infectious process. In addition, BAL has diagnostic utility in eosinophilic pneumonias, pulmonary alveolar proteinosis, and pulmonary malignancies especially lymphangitic carcinomatosis.

This technique is performed wedging the scope in the segmental bronchus of interest, and then passing the biopsy forceps through the working channel of the scope. Fluoroscopy can assist to visualize the forceps entering the pulmonary sub segment. The biopsy forceps is advanced to the periphery of the diseased region until resistance is met. Placement of the biopsy forceps near, but not at the lung surface minimizes the risk of pneumothorax. Subsequently, the forceps is withdrawn approximately 1 cm, and the jaws are opened and

possibly Gram stain of the secretions obtained by the brushing justify its use.

inclusion bodies in airway cells. There is a slight increase in mucosal bleeding.

the bronchoscopy nurse informs us of the adequacy of the sample.

**Protected-specimen brushing (PSB)**

**Bronchial brushings** 

(Baughman, 2007)

**Transbronchial biopsy (TBBx)** 

**Bronchoalveolar lavage (BAL)** 

The objective of this review is to describe the place of non-interventional FFB in the practice of modern pulmonary and critical care medicine, to review the indications, contraindications and limitations of the procedure and to discuss the role of FFB in modern intensive care units (ICUs). The versatility of the flexible bronchoscope, combined with its portability, allows one to perform the technique at the bedside, and this is of major importance in the unstable patient, who is often unable to be transported safely to the bronchoscopy suite.

#### **2. Facilities, personnel, pre-procedure investigation and monitoring**

In order to perform a FFB, a well-equipped facility, trained personnel, pre-procedure evaluation, and monitoring is highly recommended. Bronchoscopies can be performed in a bronchoscopy suite, operating room, at the bedside and in the outpatient setting. The planned bronchoscopic procedures, the availability of equipment and ancillary personnel and resources will dictate the best and safe place for the FFB.

Prior to the procedure, the patient's history must be taken and a thorough physical examination must be given. The physician must obtain information on previous therapies and current performance status. Laboratory tests (e.g. complete blood count, coagulation profile and renal function) are usually obtained despite routine preoperative coagulation screening not being recommended in patients with no risk factors for complications. (Kozak & Brath, 1994)

A minimum requirement is the availability of cardiorespiratory monitoring and oxygen and resuscitation equipment. The bronchoscopist and nursing staff should have appropriate training for the procedure to be performed. Conscious sedation can be administered by a skilled bronchoscopist or anesthesiologist. If procedures are performed under general anesthesia, the presence of an anesthesiologist and specialist nurse should be added. (European Respiratory Society/American Thoracic Society [ERS/ATS], 2002; Becker at al. 1991)

#### **3. Fiberoptic bronchoscopic techniques**

Flexible bronchoscopy is preferably performed via the transnasal approach by many bronchoscopists after appropriate topical anesthesia and conscious sedation. A complete inspection of all segments of both lungs is carried out to exclude significant endobronchial abnormalities. The following section will describe the most common bronchoscopic techniques used by the non-interventional pulmonologist.

#### **Bronchial washings**

Bronchial washings are the secretions aspirated back through the bronchoscope channel after instillation of saline into a major airway. Secretions obtained by this method do not represent material from the bronchiolar or alveolar level and in non-intubated patients they may be contaminated by secretions from the upper airway.

The main use of bronchial washings is for diagnosing pneumonia caused by strictly pathogenic organisms, such as Mycobacterium tuberculosis and endemic systemic fungi. In addition, bronchial washing can be used to collect specimens for cytology in suspected malignancy.

#### **Protected-specimen brushing (PSB)**

Protected-specimen brushing is a telescoping plugged catheter passed through the suction channel of the bronchoscope. Once beyond the tip of the scope, the internal sheet is extended, its gelatin plug expelled, and the sterile brush is dipped into either the visible airway secretions or passed more distally into the involved pulmonary segment. The brush is retrieved by reversal of the process, and then cut into a sterile container with 1mL of buffer or broth. In the microbiology laboratory, the sample is quantitatively cultured. Most investigators use the cutoff of 103 cfu/ml for differentiation of infection from contamination. The main value of PSB is for the diagnosis of bacterial pneumonia; therefore, only quantitative culture and possibly Gram stain of the secretions obtained by the brushing justify its use.

#### **Bronchial brushings**

4 Global Perspectives on Bronchoscopy

The objective of this review is to describe the place of non-interventional FFB in the practice of modern pulmonary and critical care medicine, to review the indications, contraindications and limitations of the procedure and to discuss the role of FFB in modern intensive care units (ICUs). The versatility of the flexible bronchoscope, combined with its portability, allows one to perform the technique at the bedside, and this is of major importance in the unstable patient, who is often unable to be transported safely to the

In order to perform a FFB, a well-equipped facility, trained personnel, pre-procedure evaluation, and monitoring is highly recommended. Bronchoscopies can be performed in a bronchoscopy suite, operating room, at the bedside and in the outpatient setting. The planned bronchoscopic procedures, the availability of equipment and ancillary personnel

Prior to the procedure, the patient's history must be taken and a thorough physical examination must be given. The physician must obtain information on previous therapies and current performance status. Laboratory tests (e.g. complete blood count, coagulation profile and renal function) are usually obtained despite routine preoperative coagulation screening not being recommended in patients with no risk factors for complications. (Kozak

A minimum requirement is the availability of cardiorespiratory monitoring and oxygen and resuscitation equipment. The bronchoscopist and nursing staff should have appropriate training for the procedure to be performed. Conscious sedation can be administered by a skilled bronchoscopist or anesthesiologist. If procedures are performed under general anesthesia, the presence of an anesthesiologist and specialist nurse should be added. (European Respiratory Society/American Thoracic Society [ERS/ATS], 2002; Becker at al.

Flexible bronchoscopy is preferably performed via the transnasal approach by many bronchoscopists after appropriate topical anesthesia and conscious sedation. A complete inspection of all segments of both lungs is carried out to exclude significant endobronchial abnormalities. The following section will describe the most common bronchoscopic

Bronchial washings are the secretions aspirated back through the bronchoscope channel after instillation of saline into a major airway. Secretions obtained by this method do not represent material from the bronchiolar or alveolar level and in non-intubated patients they

The main use of bronchial washings is for diagnosing pneumonia caused by strictly pathogenic organisms, such as Mycobacterium tuberculosis and endemic systemic fungi. In addition, bronchial washing can be used to collect specimens for cytology in suspected

**2. Facilities, personnel, pre-procedure investigation and monitoring** 

and resources will dictate the best and safe place for the FFB.

**3. Fiberoptic bronchoscopic techniques** 

techniques used by the non-interventional pulmonologist.

may be contaminated by secretions from the upper airway.

bronchoscopy suite.

& Brath, 1994)

**Bronchial washings** 

malignancy.

1991)

The bronchial brush catheter is inserted in a similar way as the PSB. The cytology brush is stiffer than the PSB, so it makes it easier to obtain cellular material from the airway wall. The main indication for bronchial brushes is for the cytologic diagnosis of malignancies or viral inclusion bodies in airway cells. There is a slight increase in mucosal bleeding.

#### **Bronchoalveolar lavage (BAL)**

In comparison to bronchial washing, BAL samples a much larger airway and alveolar area. It is estimated that approximately 1 million alveoli (1% of the lung surface) are sampled, with approximately 1 ml of actual lung secretions returned in the total lavage fluid. Bronchoalveolar lavage requires careful wedging of the tip of the bronchoscope into the desired airway lumen, isolating that airway from the rest of the central airways. Wedging is defined as the position where the scope cannot be advanced while the distal lumen is still visible. Then, normal saline in 30 to 60 ml aliquots are instilled two or three times and after 2 respiratory cycles the fluid is intermittently suctioned out to a trap with low suction. The first 20 ml which are secretions found in the subsegmental bronchus is usually discarded as this is not representative of alveolar lavage The returned volume varies with the amount instilled but is generally 10 to 100 ml. The number of lavages needed is based on return and the number of tests ordered. In our institution the bronchoscopy nurse informs us of the adequacy of the sample.

Bronchoalveolar lavage has been proven to be very safe and can be done without fluoroscopy. The diagnostic threshold for BAL fluid has been reported to be 104 cfu/ml for quantitative and 105 for non-quantitative cultures. Bronchoalveolar lavage is the mainstay of bronchoscopic diagnosis in the immunosuppressed patient when looking for an infectious process. In addition, BAL has diagnostic utility in eosinophilic pneumonias, pulmonary alveolar proteinosis, and pulmonary malignancies especially lymphangitic carcinomatosis. (Baughman, 2007)

#### **Transbronchial biopsy (TBBx)**

This technique is performed wedging the scope in the segmental bronchus of interest, and then passing the biopsy forceps through the working channel of the scope. Fluoroscopy can assist to visualize the forceps entering the pulmonary sub segment. The biopsy forceps is advanced to the periphery of the diseased region until resistance is met. Placement of the biopsy forceps near, but not at the lung surface minimizes the risk of pneumothorax. Subsequently, the forceps is withdrawn approximately 1 cm, and the jaws are opened and

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 7

The diagnostic yield of transbronchial needle aspiration for staging of lung cancer varies between 15- 83%, with a positive predictive values of 90-100%. In evaluating peripheral lung nodules, TBNA increases the diagnostic yield of bronchoscopy by 20-25% by facilitating the sampling of lesions that are inaccessible with the forceps or brush. Transbronchial needle aspiration has also been shown to improve the yield in the evaluation of submucosal disease, sarcoidosis, and mediastinal lymphadenopathy in acquired immune deficiency syndrome (AIDS) patients. (ERS/ATS, 2002; Dasgupta &Mehta, 1999; Wang et al., 1983;

In the last decades we have seen the introduction of several bronchoscopic diagnostic techniques which include, among others, endobronchial ultrasound, auto fluorescence bronchoscopy and electromagnetic navigation. The aim of these modalities is to increase the diagnostic yield of bronchoscopy and minimize the need for more invasive procedures.

However, such specialized innovations are limited to specialized centers and in general do not reflect the application of this technique in routine clinical practice. In recent years, TBNA has been incorporated as a routine in the bronchoscopy suite and is part of the routine

The use of endobronchial ultrasound –transbronchial needle aspiration (EBUS-TBNA) is a relatively new, minimally invasive and an emerging diagnostic modality that has proven utility in the evaluation of patients with lung cancer for the assessment of mediastinal and

The traditional and newer indications for diagnostic and therapeutic bronchoscopies permit greater latitude in the application of the procedure. Several reports including the North American survey on bronchoscopy reveals that the most common indications for bronchoscopy are the evaluation of suspicious lesions (nodules and masses), hemoptysis, pneumonia and infections, diffuse pulmonary process, and therapeutic. (Prakash at al., 1991; ATS,1987; Alamoudi et al., 2000) A study looking at 124 consecutive bronchoscopies, showed that suspicion of pulmonary tuberculosis (31%), lung mass (19%) and hemoptysis (18%) were the most common indications for the procedure. (Alamoudi et al., 2000) Although the availability of flexible bronchoscopy has been a major advance in adult pulmonary medicine, its role in pediatrics has remained less well defined. The most common indications for the procedure in the pediatric literature included stridor, abnormal

It is not uncommon to perform diagnostic and therapeutic bronchoscopies simultaneously. In one study of 198 bronchoscopies performed in critical care units, 47% were done for therapeutic reasons, 44% for diagnostic reasons, and 9% for both. (Bellomo et al., 1992)

The major indications for diagnostic bronchoscopy are listed in Table 1. The overall yield of diagnostic bronchoscopy depends on the indication and the techniques used during the procedure and vary from 45% to 80%. The most common indication for diagnostic FFB is suspected malignancy, infection or tuberculosis. (Prakash at al., 1991; Joos et al., 2006)

hilar lymph nodes, and diagnosis of lung and mediastinal tumors. (Herth et al., 2006)

chest roentgenogram and airway evaluation. (Brown et al., 1983; Nicolai, 2001)

For peripheral lesions, TBNA should be performed with fluoroscopic guidance.

Ceron et al., 2007)

training of pulmonary fellows.

**4. Indications for flexible bronchoscopy** 

advanced slightly to obtain the sample of the lung. The forceps is then advanced close to the area where resistance was encountered, and the jaws are closed. In case the patient reports pain at this point, the forceps is opened and withdrawn; only the visceral pleura is painsensitive.

The biopsy forceps is firmly retracted to obtain the sample which is placed in formalin and sent for histopathologic evaluation.

Ideally, 4 to 6 transbronchial biopsy specimens should be obtained, with at least 1 sample containing full-thickness bronchial mucosa and some alveolar parenchyma. The number of biopsy specimens required for optimal diagnostic yield has been reported to be 4 to 10; BTS guidelines recommend 4–6 samples in diffuse lung disease and 7–8 samples in focal lung disease. (British Thoracic Society Bronchoscopy [BTS], 2001)

We routinely disconnect the patient from the respirator for a couple of seconds during the initial part of forceps withdrawal. If there is any bleeding the scope is wedged to allow for clot formation. Other options include instillation of cold saline or topical epinephrine.

Transbronchial biopsy specimens are examined by histological techniques to exclude infections, malignancies or other disorders. Specimens can also be placed in sterile saline and cultured. TBBx have been shown to increase the diagnosis of PCP in AIDS patients by 15 %. The most important role for TBBx is probably the documentation of noninfectious etiologies. (Prakash at al., 1991; American Thoracic Society [ATS], 1987)

A comparison of the yield of transbronchial biopsy specimen between standard-sized forceps and large forceps found no significant differences in the size of the biopsies or in the amount of alveolar tissue collected. (Wang et al., 1980; Loube et al., 1993)

The tissue samples obtained by means of TBBx forceps are small, approximately 3 mm in size. Therefore, this procedure is not useful in diagnosing heterogeneous lung diseases such as idiopathic lung diseases.

#### **Transbronchial needle aspiration (TBNA)**

Transbronchial needle aspiration through the flexible bronchoscope was developed in the early 1980s for the diagnosis and staging of lung cancer. The most important indication for transbronchial needle aspiration is the mediastinal staging of lung cancer. The lymph node stations as defined by the TNM system are easily accessible with TBNA, which is costeffective and reduces the need for exploratory surgery. TBNA have been incorporated in the training of basic bronchoscopic skills. For a detailed review, the reader is directed to some excellent reviews on the topic. (ERS/ATS, 2002; Dasgupta & Mehta, 1999)

To obtain a specimen, the needle assembly is introduced through the working channel of the bronchoscope with the needle retracted within the metal hub of the catheter. The scope is kept as straight as possible, with its distal tip in the neutral position. These precautions are necessary to prevent damaging the working channel of the scope. Once the metal hub is visible at the distal end of the scope, the needle is advanced and locked in place. The catheter is retracted until only the tip of the needle is visible at the end of the scope. The scope is advanced to the target, and the tip of the needle is anchored into the intercartilaginous space. At this stage, the goal is to penetrate the tracheobronchial wall at an angle as close to perpendicular as possible.

advanced slightly to obtain the sample of the lung. The forceps is then advanced close to the area where resistance was encountered, and the jaws are closed. In case the patient reports pain at this point, the forceps is opened and withdrawn; only the visceral pleura is pain-

The biopsy forceps is firmly retracted to obtain the sample which is placed in formalin and

Ideally, 4 to 6 transbronchial biopsy specimens should be obtained, with at least 1 sample containing full-thickness bronchial mucosa and some alveolar parenchyma. The number of biopsy specimens required for optimal diagnostic yield has been reported to be 4 to 10; BTS guidelines recommend 4–6 samples in diffuse lung disease and 7–8 samples in focal lung

We routinely disconnect the patient from the respirator for a couple of seconds during the initial part of forceps withdrawal. If there is any bleeding the scope is wedged to allow for clot formation. Other options include instillation of cold saline or topical epinephrine.

Transbronchial biopsy specimens are examined by histological techniques to exclude infections, malignancies or other disorders. Specimens can also be placed in sterile saline and cultured. TBBx have been shown to increase the diagnosis of PCP in AIDS patients by 15 %. The most important role for TBBx is probably the documentation of noninfectious

A comparison of the yield of transbronchial biopsy specimen between standard-sized forceps and large forceps found no significant differences in the size of the biopsies or in the

The tissue samples obtained by means of TBBx forceps are small, approximately 3 mm in size. Therefore, this procedure is not useful in diagnosing heterogeneous lung diseases such

Transbronchial needle aspiration through the flexible bronchoscope was developed in the early 1980s for the diagnosis and staging of lung cancer. The most important indication for transbronchial needle aspiration is the mediastinal staging of lung cancer. The lymph node stations as defined by the TNM system are easily accessible with TBNA, which is costeffective and reduces the need for exploratory surgery. TBNA have been incorporated in the training of basic bronchoscopic skills. For a detailed review, the reader is directed to some

To obtain a specimen, the needle assembly is introduced through the working channel of the bronchoscope with the needle retracted within the metal hub of the catheter. The scope is kept as straight as possible, with its distal tip in the neutral position. These precautions are necessary to prevent damaging the working channel of the scope. Once the metal hub is visible at the distal end of the scope, the needle is advanced and locked in place. The catheter is retracted until only the tip of the needle is visible at the end of the scope. The scope is advanced to the target, and the tip of the needle is anchored into the intercartilaginous space. At this stage, the goal is to penetrate the tracheobronchial wall at

sensitive.

sent for histopathologic evaluation.

as idiopathic lung diseases.

**Transbronchial needle aspiration (TBNA)** 

an angle as close to perpendicular as possible.

disease. (British Thoracic Society Bronchoscopy [BTS], 2001)

etiologies. (Prakash at al., 1991; American Thoracic Society [ATS], 1987)

amount of alveolar tissue collected. (Wang et al., 1980; Loube et al., 1993)

excellent reviews on the topic. (ERS/ATS, 2002; Dasgupta & Mehta, 1999)

For peripheral lesions, TBNA should be performed with fluoroscopic guidance.

The diagnostic yield of transbronchial needle aspiration for staging of lung cancer varies between 15- 83%, with a positive predictive values of 90-100%. In evaluating peripheral lung nodules, TBNA increases the diagnostic yield of bronchoscopy by 20-25% by facilitating the sampling of lesions that are inaccessible with the forceps or brush. Transbronchial needle aspiration has also been shown to improve the yield in the evaluation of submucosal disease, sarcoidosis, and mediastinal lymphadenopathy in acquired immune deficiency syndrome (AIDS) patients. (ERS/ATS, 2002; Dasgupta &Mehta, 1999; Wang et al., 1983; Ceron et al., 2007)

In the last decades we have seen the introduction of several bronchoscopic diagnostic techniques which include, among others, endobronchial ultrasound, auto fluorescence bronchoscopy and electromagnetic navigation. The aim of these modalities is to increase the diagnostic yield of bronchoscopy and minimize the need for more invasive procedures.

However, such specialized innovations are limited to specialized centers and in general do not reflect the application of this technique in routine clinical practice. In recent years, TBNA has been incorporated as a routine in the bronchoscopy suite and is part of the routine training of pulmonary fellows.

The use of endobronchial ultrasound –transbronchial needle aspiration (EBUS-TBNA) is a relatively new, minimally invasive and an emerging diagnostic modality that has proven utility in the evaluation of patients with lung cancer for the assessment of mediastinal and hilar lymph nodes, and diagnosis of lung and mediastinal tumors. (Herth et al., 2006)

#### **4. Indications for flexible bronchoscopy**

The traditional and newer indications for diagnostic and therapeutic bronchoscopies permit greater latitude in the application of the procedure. Several reports including the North American survey on bronchoscopy reveals that the most common indications for bronchoscopy are the evaluation of suspicious lesions (nodules and masses), hemoptysis, pneumonia and infections, diffuse pulmonary process, and therapeutic. (Prakash at al., 1991; ATS,1987; Alamoudi et al., 2000) A study looking at 124 consecutive bronchoscopies, showed that suspicion of pulmonary tuberculosis (31%), lung mass (19%) and hemoptysis (18%) were the most common indications for the procedure. (Alamoudi et al., 2000) Although the availability of flexible bronchoscopy has been a major advance in adult pulmonary medicine, its role in pediatrics has remained less well defined. The most common indications for the procedure in the pediatric literature included stridor, abnormal chest roentgenogram and airway evaluation. (Brown et al., 1983; Nicolai, 2001)

It is not uncommon to perform diagnostic and therapeutic bronchoscopies simultaneously. In one study of 198 bronchoscopies performed in critical care units, 47% were done for therapeutic reasons, 44% for diagnostic reasons, and 9% for both. (Bellomo et al., 1992)

The major indications for diagnostic bronchoscopy are listed in Table 1. The overall yield of diagnostic bronchoscopy depends on the indication and the techniques used during the procedure and vary from 45% to 80%. The most common indication for diagnostic FFB is suspected malignancy, infection or tuberculosis. (Prakash at al., 1991; Joos et al., 2006)

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 9

The flexible bronchoscope has become the main diagnostic tool in the evaluation of patients suspected of lung cancer, with more than 70% of lung carcinomas being approachable via bronchoscopy. Additionally, bronchoscopy plays an important role in the disease staging and an extended role in delivering therapeutic modalities. Regarding staging of the malignancy, bronchoscopy may help to determine the extension of the tumor. Bronchoscopic findings of vocal cord paralysis, tumor to the level of the right tracheobronchial junction or within 2 cm of the left tracheobronchial junction, and carinal or

An advantage of flexible bronchoscopy is that it is safe, well tolerated and readily available in most places. The flexibility of the bronchoscope allows the inspection of most of the fourth order and often up to sixth order bronchi and the direct assessment of the color and

Routine bronchoscopic techniques include bronchial washings and lavage, brushings, and transbronchial biopsies. These may be augmented by the use of needle aspiration with or without the use of endobronchial ultrasound. It is still unclear if the combination of cytologic and histologic procedures provides the best diagnostic yield for lung cancer, but

The diagnostic yield of bronchoscopy for malignancy depends on the location and the size

Central endobronchial lesions carry the highest diagnostic yield of more than >90%, whereas small peripheral lesions have lower yield and usually require additional time and techniques. In visible, but intramural rather than endobronchial tumors, the diagnostic yield decreases to around 55% and is reduced further when the tumor lies beyond the bronchoscopist's vision.

The presentation of central tumors varies from an exophytic lesion, with partial or total occlusion of the bronchial lumen, to peribronchial tumors with extrinsic compression of the airway, or with submucosal infiltration of tumor. Peribronchial tumors or lesions with submucosal infiltration produce subtle changes in the mucosa that includes changes in mucosal color and vascularity, loss of bronchial markings, and nodularity of the mucosal surface. The yield of endobronchial biopsies is highest for exophytic lesions, with a diagnostic yield of approximately 90%. Central lesions are best approached with a combination of bronchial washes and brushings, and at least three to five endobronchial

The addition of transbronchial needle aspiration may improve the yield and should be considered in submucosal lesions and peribronchial disease and extrinsic compression. The TBNA needle should be inserted into the submucosal plane at an oblique angle, and in patients with peribronchial disease and extrinsic compression, the needle should be passed through the bronchial wall into the lesion. Occasionally, the presence of crush artifact or surface necrosis will give a low yield of endobronchial biopsies for this kind of lesion. (Schreiber & McCrery, 2003; Dasgupta & Mehta, 1999) In general, the diagnostic yield is

probably depends on the local expertise. (Alamoudi et al., 2000; Garg et al., 2007)

of the lesion as well as the experience of the bronchoscopist.

increased with the use of multiple bronchoscopic techniques.

(Mazzone et al., 2002; El-Bayoumi & Silvestri, 2008; Gasparini et al., 1995)

tracheal involvement are evidence of advanced stages of the malignancy.

**4.1 Most common indications for bronchoscopy** 

**4.1.1 Lung cancer** 

vascularity of the mucosa.

biopsies.


Table 1. Indications for Diagnostic Bronchoscopy

Indications for therapeutic bronchoscopy are listed in Table 2. Often, bronchoscopy is done for diagnostic and therapeutic purposes- for example patients with airway obstruction with placement of stent, or hemoptysis. No indication is absolutely restricted to a specific location; with the current portability of the bronchoscope and the advances in monitoring and bedside care, many hospitals provide ventilator care or advanced care to patients in areas other than the intensive care unit.


Table 2. Indications for Therapeutic Bronchoscopy

#### **4.1 Most common indications for bronchoscopy**

#### **4.1.1 Lung cancer**

8 Global Perspectives on Bronchoscopy

Mass/nodule/ suspicious lesion/cancer

Persistent purulent sputum of unknown etiology Trachea/ stridor/ vocal cord paralysis/hoarseness

Unexplained cough or wheezing

Superior vena cava syndrome

Tracheobronchial obstruction

**Specific Indication in the ICU** 

Suspected tracheo-esophageal fistula Abnormal radiographic findings

To evaluate complications of artificial airway

Progressive or non- resolving pneumonias. Complications in lung transplant recipients

Ventilator associated Pneumonia

Smoke and Inhalational injury

areas other than the intensive care unit.

Atelectasis/lobar collapse

Delivery of brachytherapy Percutaneous tracheostomy

Thoracic trauma Laser bronchoscopy Photodynamic therapy Electrocautery / Cryotherapy

Retained secretions and atelectasis Foreign body in the tracheobronchial tree

Dilatation of strictures and stenosis Pneumothorax (fibrin glue therapy)

Endotracheal tube placement confirmation Airway trauma, Bronchial stump dehiscence

Table 1. Indications for Diagnostic Bronchoscopy

Thermal/chemical injury

Diffuse/interstitial disease in a non-immunocompromised patient Diffuse infiltrative pulmonary disorders in immunocompromised patients

Extrapulmonary symptoms with frequent pulmonary and bronchial involvement

Evaluation of abnormal pulmonary function testing like central airway stenosis

Double lumen intubation for independent lung ventilation

Difficult intubation of airway and assessment of tube placement

Debridement of necrotic tracheobronchial mucosa

Drainage of lung abscess/bronchogenic cysts

Table 2. Indications for Therapeutic Bronchoscopy

Indications for therapeutic bronchoscopy are listed in Table 2. Often, bronchoscopy is done for diagnostic and therapeutic purposes- for example patients with airway obstruction with placement of stent, or hemoptysis. No indication is absolutely restricted to a specific location; with the current portability of the bronchoscope and the advances in monitoring and bedside care, many hospitals provide ventilator care or advanced care to patients in

Hemoptysis

Pneumonia/infection

The flexible bronchoscope has become the main diagnostic tool in the evaluation of patients suspected of lung cancer, with more than 70% of lung carcinomas being approachable via bronchoscopy. Additionally, bronchoscopy plays an important role in the disease staging and an extended role in delivering therapeutic modalities. Regarding staging of the malignancy, bronchoscopy may help to determine the extension of the tumor. Bronchoscopic findings of vocal cord paralysis, tumor to the level of the right tracheobronchial junction or within 2 cm of the left tracheobronchial junction, and carinal or tracheal involvement are evidence of advanced stages of the malignancy.

An advantage of flexible bronchoscopy is that it is safe, well tolerated and readily available in most places. The flexibility of the bronchoscope allows the inspection of most of the fourth order and often up to sixth order bronchi and the direct assessment of the color and vascularity of the mucosa.

Routine bronchoscopic techniques include bronchial washings and lavage, brushings, and transbronchial biopsies. These may be augmented by the use of needle aspiration with or without the use of endobronchial ultrasound. It is still unclear if the combination of cytologic and histologic procedures provides the best diagnostic yield for lung cancer, but probably depends on the local expertise. (Alamoudi et al., 2000; Garg et al., 2007)

The diagnostic yield of bronchoscopy for malignancy depends on the location and the size of the lesion as well as the experience of the bronchoscopist.

Central endobronchial lesions carry the highest diagnostic yield of more than >90%, whereas small peripheral lesions have lower yield and usually require additional time and techniques. In visible, but intramural rather than endobronchial tumors, the diagnostic yield decreases to around 55% and is reduced further when the tumor lies beyond the bronchoscopist's vision. (Mazzone et al., 2002; El-Bayoumi & Silvestri, 2008; Gasparini et al., 1995)

The presentation of central tumors varies from an exophytic lesion, with partial or total occlusion of the bronchial lumen, to peribronchial tumors with extrinsic compression of the airway, or with submucosal infiltration of tumor. Peribronchial tumors or lesions with submucosal infiltration produce subtle changes in the mucosa that includes changes in mucosal color and vascularity, loss of bronchial markings, and nodularity of the mucosal surface. The yield of endobronchial biopsies is highest for exophytic lesions, with a diagnostic yield of approximately 90%. Central lesions are best approached with a combination of bronchial washes and brushings, and at least three to five endobronchial biopsies.

The addition of transbronchial needle aspiration may improve the yield and should be considered in submucosal lesions and peribronchial disease and extrinsic compression. The TBNA needle should be inserted into the submucosal plane at an oblique angle, and in patients with peribronchial disease and extrinsic compression, the needle should be passed through the bronchial wall into the lesion. Occasionally, the presence of crush artifact or surface necrosis will give a low yield of endobronchial biopsies for this kind of lesion. (Schreiber & McCrery, 2003; Dasgupta & Mehta, 1999) In general, the diagnostic yield is increased with the use of multiple bronchoscopic techniques.

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 11

decrease in the number of inadequate specimens. The overall reported diagnostic yield when ROSE is used is up to 80% when compared with a 50% yield when specimens are processed in the usual manner. The concordance between the preliminary diagnosis made in the bronchoscopy suite and the final diagnosis after subsequent review of material in the cytopathology laboratory was 87%, suggesting that ROSE of needle aspirate is fairly accurate but not perfect. Disadvantage of ROSE is the requirement of an expert and readily available cytopathologist in the bronchoscopy suite which involves extra time and effort.

The clinical-radiological and routine laboratory features of pulmonary infections often offer clues to the microbial cause of the infection, but the specific etiologic diagnosis usually

Fiberoptic bronchoscopy is frequently used as part of the diagnostic investigation of suspected pulmonary infections in those cases where noninvasive tests have been nondiagnostic. The various methods used are bronchoscopic lavage, brushing, biopsies and occasionally TBNA which frequently are performed together to identify potential pathogens. Quantitative cultures of the specimen collected are performed to differentiate colonization from real pathogens. Rapid diagnosis is important, especially in

In the past, bronchoscopy has been used to obtain specimens for the identification of pathogenic organisms, such as tuberculosis, in otherwise smear-negative cases, but its role in the diagnosis of lung infections in general has been limited. As a consequence of the rapid increase in the population of immunocompromised patients due to organ transplantation, human immunodeficiency virus (HIV) infection and increased use of chemotherapeutic agents, the last decade has seen an increase in the number of patients with life-threatening

The role of bronchoscopy for community acquired pneumonia (CAP) is not clearly defined. Bronchoscopy help to retrieve specimens from the lower airway in those patients not able to produce sputum and, in addition, can identify endobronchial obstructions and other processes mimicking pneumonia.( Gross et al., 1991; Lynch & Sitrin,1993; Wintrbauer, 1995) In community acquired pneumonia the causative organism is not identified in more than 40% of cases despite an aggressive search. The use of early bronchoscopy, especially prior to the initiation of antibiotics, has been shown to increase the identification of a specific microorganism. One study reported a yield of 54% to 85% with PSB for potential pathogens. (Jimenez et al., 1993) The use of BAL may be useful in the evaluation of pneumonia with quantitative cultures of specimens correlating well with PSB results. However, a more

accurate diagnosis may not significantly change antibiotic or clinical management.

Patients who present with severe pneumonia or who fail to improve or worsen during their hospitalization despite treatment with antibiotics may require further testing with bronchoscopy. Delayed resolution of pneumonia or suspicion of neoplasm should prompt the physician to perform a FFB. (Jimenez et al., 1993; Bates et al., 1992; Torres et al., 1991)

(Baram et al., 2005; Davenport, 1990; Uchida et al., 2006)

requires the assistance of the microbiology laboratory.

**4.1.2 Pulmonary infections** 

immunocompromised patients.

pneumonia or resistant microorganisms.

**Community acquired pneumonia** 

Peripheral lesions are usually approached with a combination of bronchoscopic techniques like bronchial wash, brushes, biopsies and needle aspiration. The main determinants for the bronchoscopic diagnostic yield for peripheral lesions include:


The use of fluoroscopy increases the diagnostic yield from bronchoscopy in focal lung lesions. Fluoroscopy carries the limitation of being time consuming, requires some experience, and is not readily available in all centers. A lesion that is too small and not visible by fluoroscopy during the bronchoscopy poses a diagnostic challenge and often times require further surgical biopsy procedures. Endobronchial ultrasound and electromagnetic navigation are exciting new technologies that could help to increase the diagnostic yield in those cases. (Gasparini, 1997; Cortese & McDougaIl 1979; Yung, 2003; Liam et al., 2007)

The diagnostic yield of the TBBx can be significantly increased up to 73% by combining bronchoscopy with computed tomogram (CT) guidance in a dedicated low-dose protocol. The sensitivity of transbronchial biopsy for a solitary pulmonary nodule with multislice CT guidance has been reported to be 62.2% compared with 52.6% with fluoroscopic guidance. (Tsushima et al., 2006; Hautmann et al., 2010) The diagnostic yield of bronchoalveolar lavage alone for primary lung cancer is in the lower 30% for peripheral lung lesions. (De Gracia et al. 1993; Fabin et al., 1975; Fedullo & Ettensohn, 1985; Semenzato et al., 1990)

In a study of 162 patients with malignant lung infiltrates the BAL showed increased sensitivity in cases of bronchoalveolar cell carcinoma (93%) and lymphangitic carcinomatosis (83%). (Rennard, 1990)

The objective of staging for non–small cell lung cancer in the absence of distant metastases is the evaluation of mediastinal lymph node involvement. This is decisive to determine the prognosis and treatment plan for the patient. Nonsurgical staging includes minimally invasive needle biopsy techniques such as transbronchial or transthoracic needle aspiration and esophageal or endobronchial endoscopic ultrasound-guided fine-needle aspiration.

The reported diagnostic yield for EBUS-TBNA of lymph nodes is as high as 93% with a sensitivity, specificity, and accuracy of 94%, 100%, and 94%, respectively; positive predictive value of 100% and negative predictive value of 11%.(Herth et al.,2006)

A detailed discussion of EBUS if beyond the scope of this review, but the bronchoscopist must be aware that for those patients with known or suspected lung cancer, EBUS alone or in combination with EUS-FNA could likely replace more invasive and expensive surgical techniques. (Spiro & Porter, 2002; Gomez & Silvestri, 2009)

The use of Rapid On-site Evaluation (ROSE) has been shown to reduce the incidence of inadequate specimens which is an important cause of non-diagnostic TBNA aspirates. Several studies showed an increase of 15 to 25% in the diagnostic yield for malignancy and a decrease in the number of inadequate specimens. The overall reported diagnostic yield when ROSE is used is up to 80% when compared with a 50% yield when specimens are processed in the usual manner. The concordance between the preliminary diagnosis made in the bronchoscopy suite and the final diagnosis after subsequent review of material in the cytopathology laboratory was 87%, suggesting that ROSE of needle aspirate is fairly accurate but not perfect. Disadvantage of ROSE is the requirement of an expert and readily available cytopathologist in the bronchoscopy suite which involves extra time and effort. (Baram et al., 2005; Davenport, 1990; Uchida et al., 2006)

#### **4.1.2 Pulmonary infections**

10 Global Perspectives on Bronchoscopy

Peripheral lesions are usually approached with a combination of bronchoscopic techniques like bronchial wash, brushes, biopsies and needle aspiration. The main determinants for the



The use of fluoroscopy increases the diagnostic yield from bronchoscopy in focal lung lesions. Fluoroscopy carries the limitation of being time consuming, requires some experience, and is not readily available in all centers. A lesion that is too small and not visible by fluoroscopy during the bronchoscopy poses a diagnostic challenge and often times require further surgical biopsy procedures. Endobronchial ultrasound and electromagnetic navigation are exciting new technologies that could help to increase the diagnostic yield in those cases. (Gasparini, 1997; Cortese & McDougaIl 1979; Yung, 2003;

The diagnostic yield of the TBBx can be significantly increased up to 73% by combining bronchoscopy with computed tomogram (CT) guidance in a dedicated low-dose protocol. The sensitivity of transbronchial biopsy for a solitary pulmonary nodule with multislice CT guidance has been reported to be 62.2% compared with 52.6% with fluoroscopic guidance. (Tsushima et al., 2006; Hautmann et al., 2010) The diagnostic yield of bronchoalveolar lavage alone for primary lung cancer is in the lower 30% for peripheral lung lesions. (De Gracia et

In a study of 162 patients with malignant lung infiltrates the BAL showed increased sensitivity in cases of bronchoalveolar cell carcinoma (93%) and lymphangitic

The objective of staging for non–small cell lung cancer in the absence of distant metastases is the evaluation of mediastinal lymph node involvement. This is decisive to determine the prognosis and treatment plan for the patient. Nonsurgical staging includes minimally invasive needle biopsy techniques such as transbronchial or transthoracic needle aspiration and esophageal or endobronchial endoscopic ultrasound-guided fine-needle aspiration.

The reported diagnostic yield for EBUS-TBNA of lymph nodes is as high as 93% with a sensitivity, specificity, and accuracy of 94%, 100%, and 94%, respectively; positive predictive

A detailed discussion of EBUS if beyond the scope of this review, but the bronchoscopist must be aware that for those patients with known or suspected lung cancer, EBUS alone or in combination with EUS-FNA could likely replace more invasive and expensive surgical

The use of Rapid On-site Evaluation (ROSE) has been shown to reduce the incidence of inadequate specimens which is an important cause of non-diagnostic TBNA aspirates. Several studies showed an increase of 15 to 25% in the diagnostic yield for malignancy and a

predicts a higher yield of bronchoscopy for peripheral lung lesions.

al. 1993; Fabin et al., 1975; Fedullo & Ettensohn, 1985; Semenzato et al., 1990)

value of 100% and negative predictive value of 11%.(Herth et al.,2006)

techniques. (Spiro & Porter, 2002; Gomez & Silvestri, 2009)

bronchoscopic diagnostic yield for peripheral lesions include:

cm.

Liam et al., 2007)

carcinomatosis (83%). (Rennard, 1990)

The clinical-radiological and routine laboratory features of pulmonary infections often offer clues to the microbial cause of the infection, but the specific etiologic diagnosis usually requires the assistance of the microbiology laboratory.

Fiberoptic bronchoscopy is frequently used as part of the diagnostic investigation of suspected pulmonary infections in those cases where noninvasive tests have been nondiagnostic. The various methods used are bronchoscopic lavage, brushing, biopsies and occasionally TBNA which frequently are performed together to identify potential pathogens. Quantitative cultures of the specimen collected are performed to differentiate colonization from real pathogens. Rapid diagnosis is important, especially in immunocompromised patients.

In the past, bronchoscopy has been used to obtain specimens for the identification of pathogenic organisms, such as tuberculosis, in otherwise smear-negative cases, but its role in the diagnosis of lung infections in general has been limited. As a consequence of the rapid increase in the population of immunocompromised patients due to organ transplantation, human immunodeficiency virus (HIV) infection and increased use of chemotherapeutic agents, the last decade has seen an increase in the number of patients with life-threatening pneumonia or resistant microorganisms.

#### **Community acquired pneumonia**

The role of bronchoscopy for community acquired pneumonia (CAP) is not clearly defined. Bronchoscopy help to retrieve specimens from the lower airway in those patients not able to produce sputum and, in addition, can identify endobronchial obstructions and other processes mimicking pneumonia.( Gross et al., 1991; Lynch & Sitrin,1993; Wintrbauer, 1995)

In community acquired pneumonia the causative organism is not identified in more than 40% of cases despite an aggressive search. The use of early bronchoscopy, especially prior to the initiation of antibiotics, has been shown to increase the identification of a specific microorganism. One study reported a yield of 54% to 85% with PSB for potential pathogens. (Jimenez et al., 1993) The use of BAL may be useful in the evaluation of pneumonia with quantitative cultures of specimens correlating well with PSB results. However, a more accurate diagnosis may not significantly change antibiotic or clinical management.

Patients who present with severe pneumonia or who fail to improve or worsen during their hospitalization despite treatment with antibiotics may require further testing with bronchoscopy. Delayed resolution of pneumonia or suspicion of neoplasm should prompt the physician to perform a FFB. (Jimenez et al., 1993; Bates et al., 1992; Torres et al., 1991)

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 13

Aspiration of stomach contents is a major cause of morbidity and mortality in adults and is a risk factor for acute respiratory distress syndrome. Bronchoscopy is indicated in patients with chemical pneumonia and when aspiration of a foreign body or food material is suspected. Aspirated material is frequently liquid in nature and disperses rapidly. Hence, routine FFB with lavage is not indicated. However, in the event that the aspirate is predominantly particulate in nature with radiographic evidence of lobar collapse or major

Bronchoscopy has an important role in diagnosing airway injury and confirming tracheobronchial damage secondary to orally aspirated caustic material. Bronchoscopy may be helpful in guiding antibiotic therapy. This procedure is useful when ruling out the presence of an obstructing neoplasm in anaerobic bacterial pneumonia with lung abscess; however, bronchoscopy is not useful in the treatment of community-acquired aspiration

Tuberculosis (TB) remains a threat with the increased traveling, globalization, HIV epidemic, and immigration. Those patients suspected to have TB and who have no sputum or sputum smear negative for acid fast bacilli seem to benefit the most from

Comparison of various bronchoscopic techniques showed that the yield of bronchoalveolar lavage for tuberculosis is superior to bronchial washings. Transbronchial biopsy and bronchial brushing cultures provided little additional diagnostic yield. Bronchoscopy can give immediate diagnosis when there is a positive smear from BAL fluid or caseating granulomas in the TBBx. Occasionally an alternative diagnosis can be found. (Venkateshiah

Fungal infections contribute to significant morbidity and mortality in immunocompromised patients and bronchoscopy is useful in the diagnosis of these infections. PJP is a common infection in the immunocompromised and the diagnostic yield for BAL is up to 98 %.

Aspergillus is a colonizer of the tracheobronchial tree and tissue diagnosis is necessary for the diagnosis. BAL fluid may suggest the development of invasive disease (Cahill et al., 1997), but does not establish the diagnosis. Newer techniques like BAL galactomannan levels which have a good sensitivity and specificity for the detection of invasive disease could be promising for the diagnosis (Meersseman et al.,2008; Hsu et al., 2010; Maertens et

Candida is a frequent colonizer and their presence in BAL fluid may represent colonization

In patients with non-resolving pneumonias in endemic areas, morphological and cytological analysis may aid in therapy of endemic mycoses like histoplasmosis, blastomycosis,

al., 2009); however, false-positive results are seen. (Digby et al., 2003)

rather than infection in the immunocompetent host.(el-Ebiary et al.,1997)

coccidioidomycosis and paracoccidioidomycosis; however culture is diagnostic.

**Aspiration pneumonia** 

**Tuberculosis**

bronchoscopy.

**Fungal infections** 

(Huang et al., 2006)

& Mehta, 2003; Kobashi et al., 2007)

atelectasis, therapeutic bronchoscopy is helpful.

pneumonia. (Kollef et al., 1995; Raghavendran et al., 2011)

#### **Progressive or non-resolving pneumonias**

Majority of patients with CAP recover after appropriate antimicrobial therapy with about 10-15% of cases having no clinical improvement and they are categorized as non-responding or progressive pneumonia. (Arancibia et al., 2000)

Progressive pneumonias are defined as actual clinical deterioration, with acute respiratory failure requiring ventilatory support and/or septic shock, usually occurring within the first 72 h of hospital admission. Non-resolving pneumonias refer to absence of clinical stability after 3 days of antibiotics. (Mandell et al., 2007)

Causes include host factors, inappropriate microbiological therapy (uncommon pathogens) and non infective causes mimicking pneumonia. Non infective differential diagnosis includes acute eosinophilic pneumonia, acute cryptogenic organizing pneumonia, acute sarcoidosis, acute hypersensitivity pneumonitis, pulmonary alveolar proteinosis and others. (Gross et al., 1991; Lynch & Sitrin,1993; Wintrbauer, 1995) Bronchoscopy can establish the diagnosis in many of the infections as well as in non-infectious etiologies like acute eosinophilic pneumonia, diffuse alveolar hemorrhage or damage, pulmonary alveolar proteinosis, lipoid pneumonia, eosinophilic granulomas, and rarely rapidly progressing neoplasms. The use of TBBx can add additional diagnosis in selected patients. (Bulpa et al.,2003)

#### **Ventilator associated pneumonia**

Ventilator associated pneumonia (VAP) is a common health care associated infection, that develops in patients on mechanical ventilation and complicates the hospital course in 8-28% of patients on mechanical ventilation. (Haley et al., 1981; Pennington, 1990; Chastre & Fagon, 1994; Centers for Disease Control and Prevention [CDC] MMWR 2000; National Nosocomial Infections Surveillance [NNIS] System.1999)

The crude mortality ranges from 30 to 50%; however attributable mortality ranges widely from 5.8% to 18.8%. (Esperatti et al., 2010; Nguile-Makao et al., 2010; Muscedere et al., 2008)

Early and appropriate antimicrobial therapy has been advocated to decrease complication rates and mortality. (Celis et al., 1988; Luna et al., 1997; Kollef & Ward 1998)

Chest radiographic abnormalities are common in ventilated patients and some of the differential diagnosis includes atelectasis, pneumonia, drug reactions, and pulmonary embolism. Diagnosis of VAP remains a diagnostic challenge with a potential for overuse of antibiotics. To aid in decision making, Pugin et al. suggested the clinical pulmonary infection score (CPIS); a score higher than 6 having a high predictive value for the diagnosis of VAP.( Pugin et al., 1991; Alvarez-Lerma, 1996; Fabregas et al., 1999; Fischer et al., 1998; Flanagan et al., 2000; Singh et al., 2000) A subsequent trial comparing inter observer variability of CPIS score for the diagnosis of VAP, revealed a sensitivity of 83% and specificity of 17% with a area under receiver operating characteristic (AROC) of 0.55 ,when CPIS score was compared with qualitative BAL fluid cultures. (Schurink et al., 2004)

Fagon et al. reported reduced 14-day mortality with the use of a bronchoscopic bacteriologic strategy compared with a clinical strategy alone. (Fagon et al., 2000)

The use of TBBx could increase the diagnostic yield especially in patients with unexplained pulmonary infiltrates. Bronchoscopy can aid to distinguish between colonization and infection in those patients. (Pechkam & Elliott, 2002)

#### **Aspiration pneumonia**

12 Global Perspectives on Bronchoscopy

Majority of patients with CAP recover after appropriate antimicrobial therapy with about 10-15% of cases having no clinical improvement and they are categorized as non-responding

Progressive pneumonias are defined as actual clinical deterioration, with acute respiratory failure requiring ventilatory support and/or septic shock, usually occurring within the first 72 h of hospital admission. Non-resolving pneumonias refer to absence of clinical stability

Causes include host factors, inappropriate microbiological therapy (uncommon pathogens) and non infective causes mimicking pneumonia. Non infective differential diagnosis includes acute eosinophilic pneumonia, acute cryptogenic organizing pneumonia, acute sarcoidosis, acute hypersensitivity pneumonitis, pulmonary alveolar proteinosis and others. (Gross et al., 1991; Lynch & Sitrin,1993; Wintrbauer, 1995) Bronchoscopy can establish the diagnosis in many of the infections as well as in non-infectious etiologies like acute eosinophilic pneumonia, diffuse alveolar hemorrhage or damage, pulmonary alveolar proteinosis, lipoid pneumonia, eosinophilic granulomas, and rarely rapidly progressing neoplasms. The use of

Ventilator associated pneumonia (VAP) is a common health care associated infection, that develops in patients on mechanical ventilation and complicates the hospital course in 8-28% of patients on mechanical ventilation. (Haley et al., 1981; Pennington, 1990; Chastre & Fagon, 1994; Centers for Disease Control and Prevention [CDC] MMWR 2000; National

The crude mortality ranges from 30 to 50%; however attributable mortality ranges widely from 5.8% to 18.8%. (Esperatti et al., 2010; Nguile-Makao et al., 2010; Muscedere et al., 2008) Early and appropriate antimicrobial therapy has been advocated to decrease complication

Chest radiographic abnormalities are common in ventilated patients and some of the differential diagnosis includes atelectasis, pneumonia, drug reactions, and pulmonary embolism. Diagnosis of VAP remains a diagnostic challenge with a potential for overuse of antibiotics. To aid in decision making, Pugin et al. suggested the clinical pulmonary infection score (CPIS); a score higher than 6 having a high predictive value for the diagnosis of VAP.( Pugin et al., 1991; Alvarez-Lerma, 1996; Fabregas et al., 1999; Fischer et al., 1998; Flanagan et al., 2000; Singh et al., 2000) A subsequent trial comparing inter observer variability of CPIS score for the diagnosis of VAP, revealed a sensitivity of 83% and specificity of 17% with a area under receiver operating characteristic (AROC) of 0.55 ,when

CPIS score was compared with qualitative BAL fluid cultures. (Schurink et al., 2004)

strategy compared with a clinical strategy alone. (Fagon et al., 2000)

infection in those patients. (Pechkam & Elliott, 2002)

Fagon et al. reported reduced 14-day mortality with the use of a bronchoscopic bacteriologic

The use of TBBx could increase the diagnostic yield especially in patients with unexplained pulmonary infiltrates. Bronchoscopy can aid to distinguish between colonization and

TBBx can add additional diagnosis in selected patients. (Bulpa et al.,2003)

rates and mortality. (Celis et al., 1988; Luna et al., 1997; Kollef & Ward 1998)

Nosocomial Infections Surveillance [NNIS] System.1999)

**Progressive or non-resolving pneumonias** 

or progressive pneumonia. (Arancibia et al., 2000)

after 3 days of antibiotics. (Mandell et al., 2007)

**Ventilator associated pneumonia** 

Aspiration of stomach contents is a major cause of morbidity and mortality in adults and is a risk factor for acute respiratory distress syndrome. Bronchoscopy is indicated in patients with chemical pneumonia and when aspiration of a foreign body or food material is suspected. Aspirated material is frequently liquid in nature and disperses rapidly. Hence, routine FFB with lavage is not indicated. However, in the event that the aspirate is predominantly particulate in nature with radiographic evidence of lobar collapse or major atelectasis, therapeutic bronchoscopy is helpful.

Bronchoscopy has an important role in diagnosing airway injury and confirming tracheobronchial damage secondary to orally aspirated caustic material. Bronchoscopy may be helpful in guiding antibiotic therapy. This procedure is useful when ruling out the presence of an obstructing neoplasm in anaerobic bacterial pneumonia with lung abscess; however, bronchoscopy is not useful in the treatment of community-acquired aspiration pneumonia. (Kollef et al., 1995; Raghavendran et al., 2011)

#### **Tuberculosis**

Tuberculosis (TB) remains a threat with the increased traveling, globalization, HIV epidemic, and immigration. Those patients suspected to have TB and who have no sputum or sputum smear negative for acid fast bacilli seem to benefit the most from bronchoscopy.

Comparison of various bronchoscopic techniques showed that the yield of bronchoalveolar lavage for tuberculosis is superior to bronchial washings. Transbronchial biopsy and bronchial brushing cultures provided little additional diagnostic yield. Bronchoscopy can give immediate diagnosis when there is a positive smear from BAL fluid or caseating granulomas in the TBBx. Occasionally an alternative diagnosis can be found. (Venkateshiah & Mehta, 2003; Kobashi et al., 2007)

#### **Fungal infections**

Fungal infections contribute to significant morbidity and mortality in immunocompromised patients and bronchoscopy is useful in the diagnosis of these infections. PJP is a common infection in the immunocompromised and the diagnostic yield for BAL is up to 98 %. (Huang et al., 2006)

Aspergillus is a colonizer of the tracheobronchial tree and tissue diagnosis is necessary for the diagnosis. BAL fluid may suggest the development of invasive disease (Cahill et al., 1997), but does not establish the diagnosis. Newer techniques like BAL galactomannan levels which have a good sensitivity and specificity for the detection of invasive disease could be promising for the diagnosis (Meersseman et al.,2008; Hsu et al., 2010; Maertens et al., 2009); however, false-positive results are seen. (Digby et al., 2003)

Candida is a frequent colonizer and their presence in BAL fluid may represent colonization rather than infection in the immunocompetent host.(el-Ebiary et al.,1997)

In patients with non-resolving pneumonias in endemic areas, morphological and cytological analysis may aid in therapy of endemic mycoses like histoplasmosis, blastomycosis, coccidioidomycosis and paracoccidioidomycosis; however culture is diagnostic.

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 15

Atelectasis is a frequent complication seen in the ICU and retained secretions and atelectasis remains a common therapeutic indication for bronchoscopy. Although the use of FFB in situations of whole lung collapse associated with hypoxia is well established, there are no definitive guidelines in other situations. Bronchoscopy is usually performed when suctioning and chest physiotherapy fails to result in aeration of involved lungs. Stevens et al reported that 93 (79 %) of 118 bronchoscopies performed for atelectasis resulted in improvement compared with 31 (44%) of 70 patients with retained secretions. (Stevens et al., 1981) Other studies have reported a success rate between 19% to 81%. (Weinstein et al., 1977;

In a prospective study Marini et al reported that the presence of air bronchograms on the initial chest roentgenogram predicted delayed resolution of atelectasis. (Marini et al.,

Bronchoalveolar lavage may aid in the resolution of atelectasis and identify some pathogenic microorganisms. In addition, bronchoscopy allows the instillation of mucolytic agents. We suggest bronchoscopy in critically ill patients with lobar or whole lung collapse

Foreign body (FB) aspiration is frequently suspected in children with acute or recurrent pulmonary symptoms, but it is rarely considered in adults with acute or chronic respiratory symptoms unless a clear history of aspiration can be obtained. Food items are the most common aspirated FB with peanuts and animal or fish bones being the most common ones. The most common presentation is chronic cough, hemoptysis, dyspnea, and fever. If the FB is not removed, then more persistent findings may be seen such as atelectasis, post obstructive pneumonia, bronchiectasis, or lung abscess, and/or emphysema. The exact incidence of FB aspiration in adults is not known. Some studies report that only 7% of

Any condition leading to diminished swallowing reflex places the patients at risk for FB aspiration. Bronchoscopy is a valuable tool for the diagnosis and retrieval of the FB. Instruments used in retrieval include alligator and biopsy forceps, wire baskets and retrieval forceps. Overall success rates for retrieval of FBs ranges from 61 to 89% for both flexible and rigid bronchoscopies. (Limper &Prakash, 1990; Debeljak et al., 1999; Cunanan, 1978; Lan et al., 1989) FFB is probably more useful for FB in distal segments beyond the reach of rigid bronchoscope. In some cases, flexible and rigid bronchoscopy are complementary, with FFB assisting in the localization of the FB and then retrieval done with the rigid bronchoscope. Significant tissue reaction with inflammation is commonly seen in the delayed cases at bronchoscopy. Innovative anecdotal use of cryotherapy instruments to remove some foreign

Approximately 1% to 3% of tracheal intubations prove to be difficult with standard techniques. This is especially true as all invasive airway maneuvers can be considered difficult in a critically ill patient, either in the ICU or other setting. (Schwartz et al.,1995)

**4.1.4 Miscellaneous** 

**Retained secretions and atelectasis** 

Lindholm et al., 1974; Snow& Lucas, 1984)

**Removal of foreign bodies** 

bodies have also been described.

**Difficult intubation** 

1979).In this situation bronchoscopy may not be beneficial.

without air bronchograms if chest physiotherapy is unsuccessful.

patients present with a history of choking (Chen et al., 1997).

#### **4.1.3 Diffuse lung diseases**

#### **Interstitial lung diseases**

The interstitial lung diseases (ILDs), are a diverse group of pulmonary disorders classified together because of similar clinical, radiological, physiologic, or pathologic characteristics. The patient with suspected ILD presents a diagnostic challenge to physicians.

The role of bronchoscopy for the diagnosis of ILD's is limited due to the small size of the biopsies. Several studies have shown that the accuracy of TBBx for the diagnosis of ILD's is only 7 to 37% in immunocompetent patients. (Wall et al., 1981)

The role of FFB with BAL and TBBX in patients with diffuse lung disease is limited to the exclusion of infections, malignancy, sarcoidosis, eosinophilic pneumonias and occasionally cryptogenic organizing pneumonia. Analysis of BAL fluid can show certain cellular profiles that suggest specific disease processes; for example, sarcoidosis has lymphocytosis characterized by an increase in T-helper cells and a high CD4/CD8 ratio; hypersensitivity pneumonitis has T lymphocytosis, with predominance of the suppressor subset CD8; and idiopathic pulmonary fibrosis is characterized by increases in neutrophils and eosinophils. Unfortunately, the BAL findings have limited clinical utility for the diagnosis, prognosis or as a guide to therapy in patients with ILD's. Using TBBx to diagnose idiopathic ILD's is not recommended. Surgical lung biopsy remains the investigation with the greatest overall diagnostic sensitivity for ILD's. (ATS/ERS, 2002; Talmadge, 2005)

#### **Diffuse infiltrative pulmonary disorders in immunocompromised patients**

Immunocompromised hosts include patients with AIDS, bone marrow and other transplant recipients, patients on chemo or radiation therapy, and patients on immunosuppressive therapy. These patients can be acutely ill and present often with progressive hypoxia. (Pechkam & Elliott, 2002). Differential diagnosis in this group includes both infective and non infective causes. Infective causes are viral and PJP infections, atypical pathogens, fungal and parasitic infections. Non-infective causes include graft rejection, toxicity secondary to radiation or chemotherapy, diffuse alveolar damage and diffuse alveolar hemorrhage. Rapid progression of the illness is not uncommon with the need for mechanical ventilation. Diagnostic delay in this group increases mortality and bronchoscopy can be very useful in the early diagnosis and management of these patients.

#### **Lung transplant recipients**

The number of transplant patients continues to grow and their care is not limited to specialized centers. They can present with a wide range of pulmonary disorders and causes of respiratory deterioration in transplant patients include rejection or infections. Bronchoscopy remains a valuable tool in this setting. FFB with BAL and TBBx has high sensitivity for the diagnosis of PJP, CMV and rejection. (Bulpa et al., 2003) The presence of Aspergillus in BAL fluid though non-diagnostic is predictive of development of invasive disease. (Cahill et al., 1997) Therapeutic bronchoscopic interventions include dilatation and stenting of stenotic lesions and laser ablation of granulation tissue. (Wahidi & Ernst, 2004)

#### **4.1.4 Miscellaneous**

14 Global Perspectives on Bronchoscopy

The interstitial lung diseases (ILDs), are a diverse group of pulmonary disorders classified together because of similar clinical, radiological, physiologic, or pathologic characteristics.

The role of bronchoscopy for the diagnosis of ILD's is limited due to the small size of the biopsies. Several studies have shown that the accuracy of TBBx for the diagnosis of ILD's is

The role of FFB with BAL and TBBX in patients with diffuse lung disease is limited to the exclusion of infections, malignancy, sarcoidosis, eosinophilic pneumonias and occasionally cryptogenic organizing pneumonia. Analysis of BAL fluid can show certain cellular profiles that suggest specific disease processes; for example, sarcoidosis has lymphocytosis characterized by an increase in T-helper cells and a high CD4/CD8 ratio; hypersensitivity pneumonitis has T lymphocytosis, with predominance of the suppressor subset CD8; and idiopathic pulmonary fibrosis is characterized by increases in neutrophils and eosinophils. Unfortunately, the BAL findings have limited clinical utility for the diagnosis, prognosis or as a guide to therapy in patients with ILD's. Using TBBx to diagnose idiopathic ILD's is not recommended. Surgical lung biopsy remains the investigation with the greatest overall diagnostic sensitivity for ILD's. (ATS/ERS, 2002;

Immunocompromised hosts include patients with AIDS, bone marrow and other transplant recipients, patients on chemo or radiation therapy, and patients on immunosuppressive therapy. These patients can be acutely ill and present often with progressive hypoxia. (Pechkam & Elliott, 2002). Differential diagnosis in this group includes both infective and non infective causes. Infective causes are viral and PJP infections, atypical pathogens, fungal and parasitic infections. Non-infective causes include graft rejection, toxicity secondary to radiation or chemotherapy, diffuse alveolar damage and diffuse alveolar hemorrhage. Rapid progression of the illness is not uncommon with the need for mechanical ventilation. Diagnostic delay in this group increases mortality and bronchoscopy can be very useful in

The number of transplant patients continues to grow and their care is not limited to specialized centers. They can present with a wide range of pulmonary disorders and causes of respiratory deterioration in transplant patients include rejection or infections. Bronchoscopy remains a valuable tool in this setting. FFB with BAL and TBBx has high sensitivity for the diagnosis of PJP, CMV and rejection. (Bulpa et al., 2003) The presence of Aspergillus in BAL fluid though non-diagnostic is predictive of development of invasive disease. (Cahill et al., 1997) Therapeutic bronchoscopic interventions include dilatation and stenting of stenotic lesions and laser ablation of granulation tissue. (Wahidi & Ernst,

The patient with suspected ILD presents a diagnostic challenge to physicians.

**Diffuse infiltrative pulmonary disorders in immunocompromised patients** 

the early diagnosis and management of these patients.

only 7 to 37% in immunocompetent patients. (Wall et al., 1981)

**4.1.3 Diffuse lung diseases Interstitial lung diseases** 

Talmadge, 2005)

**Lung transplant recipients** 

2004)

#### **Retained secretions and atelectasis**

Atelectasis is a frequent complication seen in the ICU and retained secretions and atelectasis remains a common therapeutic indication for bronchoscopy. Although the use of FFB in situations of whole lung collapse associated with hypoxia is well established, there are no definitive guidelines in other situations. Bronchoscopy is usually performed when suctioning and chest physiotherapy fails to result in aeration of involved lungs. Stevens et al reported that 93 (79 %) of 118 bronchoscopies performed for atelectasis resulted in improvement compared with 31 (44%) of 70 patients with retained secretions. (Stevens et al., 1981) Other studies have reported a success rate between 19% to 81%. (Weinstein et al., 1977; Lindholm et al., 1974; Snow& Lucas, 1984)

In a prospective study Marini et al reported that the presence of air bronchograms on the initial chest roentgenogram predicted delayed resolution of atelectasis. (Marini et al., 1979).In this situation bronchoscopy may not be beneficial.

Bronchoalveolar lavage may aid in the resolution of atelectasis and identify some pathogenic microorganisms. In addition, bronchoscopy allows the instillation of mucolytic agents. We suggest bronchoscopy in critically ill patients with lobar or whole lung collapse without air bronchograms if chest physiotherapy is unsuccessful.

#### **Removal of foreign bodies**

Foreign body (FB) aspiration is frequently suspected in children with acute or recurrent pulmonary symptoms, but it is rarely considered in adults with acute or chronic respiratory symptoms unless a clear history of aspiration can be obtained. Food items are the most common aspirated FB with peanuts and animal or fish bones being the most common ones. The most common presentation is chronic cough, hemoptysis, dyspnea, and fever. If the FB is not removed, then more persistent findings may be seen such as atelectasis, post obstructive pneumonia, bronchiectasis, or lung abscess, and/or emphysema. The exact incidence of FB aspiration in adults is not known. Some studies report that only 7% of patients present with a history of choking (Chen et al., 1997).

Any condition leading to diminished swallowing reflex places the patients at risk for FB aspiration. Bronchoscopy is a valuable tool for the diagnosis and retrieval of the FB. Instruments used in retrieval include alligator and biopsy forceps, wire baskets and retrieval forceps. Overall success rates for retrieval of FBs ranges from 61 to 89% for both flexible and rigid bronchoscopies. (Limper &Prakash, 1990; Debeljak et al., 1999; Cunanan, 1978; Lan et al., 1989) FFB is probably more useful for FB in distal segments beyond the reach of rigid bronchoscope. In some cases, flexible and rigid bronchoscopy are complementary, with FFB assisting in the localization of the FB and then retrieval done with the rigid bronchoscope. Significant tissue reaction with inflammation is commonly seen in the delayed cases at bronchoscopy. Innovative anecdotal use of cryotherapy instruments to remove some foreign bodies have also been described.

#### **Difficult intubation**

Approximately 1% to 3% of tracheal intubations prove to be difficult with standard techniques. This is especially true as all invasive airway maneuvers can be considered difficult in a critically ill patient, either in the ICU or other setting. (Schwartz et al.,1995)

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 17

patients.(Cunningham et al., 1977) A more recent study looking at 72 patients with renal insufficiency reported a much lower rate of bleeding complications with TBBx. There were no complications in the hemodialysis (HD) group and only one of 25 (4%) patients not on

These findings suggest the possibility that the risk of bleeding in patients with renal insufficiency undergoing TBBx is lower than initially reported. Those patients should be screened for coagulation abnormalities and, if receiving HD, the TBBx should be done after HD with pre-bronchoscopy administration of 1-deamino-8-D-arginine vasopressin (DDAVP).Platelet transfusions, infusion of cryoprecipitate or DDAVP, administration of analogues or derivatives of vasopressin and administration of estrogen are some of the strategies implemented to decrease bleeding complications during FFB. (Cordasco et al., 1991)

Hypoxia is a relatively common complication of FFB, which may predispose to cardiac arrhythmias. (Katz et al., 1981) Cardiovascular stress and hypertension are common and can result in cardiovascular changes during bronchoscopy especially if they have cardiac risk factors.( Davies et al.,1997) Acute myocardial infarction (AMI) is generally considered to increase the risk of FFB. A retrospective study concluded that bronchoscopy is safe in the immediate post-AMI period as long as the patient does not have active ischemia at the time of the procedure; the mean period between the AMI and FFB was 11.7 days. The risks of bronchoscopy are thought to be reduced 4–6 weeks after myocardial infarction. (Dweik et al., 1996; Kvale, 1996; American College of Cardiology and American Heart Association

Asthma has been associated with laryngospasm or bronchospasm complicating bronchoscopy. The reported incidence of bronchoscopy induced bronchospasm ranges from 0.02% to 8%. Decrease in FEV1 is seen during FFB and this is more pronounced in asthmatics compared to non asthmatics. In patients with mild asthma, pre procedure use of bronchodilator has not been associated with a decrease in the postoperative FEV1, however, the use of pre-bronchoscopy bronchodilator is associated with blunting of the post bronchoscopy decrease in FEV1 in asthmatics with more severe disease.( Fish & Peterman 1979; Djukanovic et al., 1991;Van Vyve et al., 1992; Rankin et al., 1984; Mavritsyn & Lifshits, 1980) In a large multicenter study of over 20,000 bronchoscopies, bronchospasm was reported in 0.004% of all the procedures.(Facciolongo et al., 2009) In general, it is recommended that patients with asthma receive bronchodilator nebulizers before the procedure; taking in consideration that the benefit have been reported mainly in the most

The presence of severe chronic obstructive pulmonary disease (COPD) has been shown to increase the complication rate of bronchoscopy. The complication rate is as high as 3% to 5% in severe COPD (FEV1 /FVC <50% or FEV1 <1.2 L) when compared with 0.6% of patients with normal lung function. An arterial blood gas should be considered prior to bronchoscopy for those patients with severe COPD. The judicious use of sedation and monitoring of oxygenation and ventilation permit the safe performance of FFB in selected patients with COPD.( BTS, 2001; Peacock et al., 1994; Hattotuwa et al., 2002) Although there is no data regarding the use of pre-procedure bronchodilators in COPD, we routinely use

HD had a bleeding complication. (Mehta et al., 2005)

**Bronchoscopy in patients with cardiac ischemia** 

Taskforce, 1996; Dunagan et al., 1998; Bein &Pfeifer, 1997) **Bronchoscopy in patients with obstructive airway disease**

severe asthmatic.

Fiberoptic intubation is a key aspect in the management of difficult intubations and forms part of several difficult airway algorithms (Benumof, 1991; American Society of Anesthesiologists, 2003; Crosby et al., 1998; Henderson et al., 2004) Intubation in these instances is performed using the bronchoscope as an obturator. Care must be taken to use a bite guard or an oral airway as damage to the scope by patient bites should be avoided.

#### **Hemoptysis**

Massive hemoptysis, defined as the volume of expectorated blood that is life-threatening due to hypoxia from airway obstruction or hemodynamic instability from blood loss, accounts for 4.8% to 14% of all patients with hemoptysis. (Dweik & Stoller, 1999)

Massive hemoptysis remains an emergent indication for bronchoscopy. The primary intention is to locate the source of bleeding and if possible to control it by use of topical or endobronchial tamponade. Control of bleeding can be achieved by topical application of cold saline or diluted 1: 1000 epinephrine; other agents include application of thrombin or fibrinogen–thrombin combination. (Tsukamoto et al., 1989)

Endobronchial tamponade can be achieved using a Fogarty balloon or rarely a pulmonary artery catheter. In rare instances bronchoscopic guided contralateral lung intubation is life saving. Localization of the bleed helps in the planning of bronchial artery embolization or thoracotomy.

#### **Bronchopleural fistula**

In patients with persistent air leaks and suspected broncho-pleural fistula (BPF), bronchoscopy can help define the extent of the broncho-pleural fistula and differentiate between stump dehiscence and a distal parenchymal leak. In addition, BPF associated with pneumonectomy or lobectomy can be directly visualized. In patients with suspected distal BPF a careful sequential inspection of each bronchopulmonary segment should be performed; this usually requires the use of balloons to occlude the bronchial segments to locate the one leading to the fistula and then apply sealants. (Lan et al., 1987; Regel et al. 1989; Lois & Noppen,2005; Oren et al., 2011)

Other indications include confirmation of endotracheal tube (ETT) placement, double lumen ETT placement, diagnosis of bronchial rupture or bronchial stump dehiscence. Less common indications include inspection of upper airway prior to extubation when edema or other anatomical problems are expected in an intubated patient. In such instances, extubation can be attempted under bronchoscopic guidance and reintubation if necessary can be easily done using the bronchoscope as a guide wire. Bronchoscopy in indicated in patients with smoke inhalation to categorize the extent of injury and the need for intubation and in the presence of glottic and subglottic edema, intubation can be performed safely under bronchoscopic guidance.

#### **4.1.5 Bronchoscopy in special circumstances**

#### **Bronchoscopy in patients with renal impairment**

Uremia has been reported to be associated with an increased risk of bleeding, mainly due to platelet dysfunction. (Cordasco et al., 1991)A 45% incidence of pulmonary hemorrhage after bronchoscopic lung biopsy was documented in immunosuppressed uremic

Fiberoptic intubation is a key aspect in the management of difficult intubations and forms part of several difficult airway algorithms (Benumof, 1991; American Society of Anesthesiologists, 2003; Crosby et al., 1998; Henderson et al., 2004) Intubation in these instances is performed using the bronchoscope as an obturator. Care must be taken to use a bite guard or an oral airway as damage to the scope by patient bites should be avoided.

Massive hemoptysis, defined as the volume of expectorated blood that is life-threatening due to hypoxia from airway obstruction or hemodynamic instability from blood loss,

Massive hemoptysis remains an emergent indication for bronchoscopy. The primary intention is to locate the source of bleeding and if possible to control it by use of topical or endobronchial tamponade. Control of bleeding can be achieved by topical application of cold saline or diluted 1: 1000 epinephrine; other agents include application of thrombin or

Endobronchial tamponade can be achieved using a Fogarty balloon or rarely a pulmonary artery catheter. In rare instances bronchoscopic guided contralateral lung intubation is life saving. Localization of the bleed helps in the planning of bronchial artery embolization or

In patients with persistent air leaks and suspected broncho-pleural fistula (BPF), bronchoscopy can help define the extent of the broncho-pleural fistula and differentiate between stump dehiscence and a distal parenchymal leak. In addition, BPF associated with pneumonectomy or lobectomy can be directly visualized. In patients with suspected distal BPF a careful sequential inspection of each bronchopulmonary segment should be performed; this usually requires the use of balloons to occlude the bronchial segments to locate the one leading to the fistula and then apply sealants. (Lan et al., 1987; Regel et al.

Other indications include confirmation of endotracheal tube (ETT) placement, double lumen ETT placement, diagnosis of bronchial rupture or bronchial stump dehiscence. Less common indications include inspection of upper airway prior to extubation when edema or other anatomical problems are expected in an intubated patient. In such instances, extubation can be attempted under bronchoscopic guidance and reintubation if necessary can be easily done using the bronchoscope as a guide wire. Bronchoscopy in indicated in patients with smoke inhalation to categorize the extent of injury and the need for intubation and in the presence of glottic and subglottic edema, intubation can be performed safely

Uremia has been reported to be associated with an increased risk of bleeding, mainly due to platelet dysfunction. (Cordasco et al., 1991)A 45% incidence of pulmonary hemorrhage after bronchoscopic lung biopsy was documented in immunosuppressed uremic

accounts for 4.8% to 14% of all patients with hemoptysis. (Dweik & Stoller, 1999)

fibrinogen–thrombin combination. (Tsukamoto et al., 1989)

**Hemoptysis** 

thoracotomy.

**Bronchopleural fistula** 

1989; Lois & Noppen,2005; Oren et al., 2011)

**4.1.5 Bronchoscopy in special circumstances Bronchoscopy in patients with renal impairment** 

under bronchoscopic guidance.

patients.(Cunningham et al., 1977) A more recent study looking at 72 patients with renal insufficiency reported a much lower rate of bleeding complications with TBBx. There were no complications in the hemodialysis (HD) group and only one of 25 (4%) patients not on HD had a bleeding complication. (Mehta et al., 2005)

These findings suggest the possibility that the risk of bleeding in patients with renal insufficiency undergoing TBBx is lower than initially reported. Those patients should be screened for coagulation abnormalities and, if receiving HD, the TBBx should be done after HD with pre-bronchoscopy administration of 1-deamino-8-D-arginine vasopressin (DDAVP).Platelet transfusions, infusion of cryoprecipitate or DDAVP, administration of analogues or derivatives of vasopressin and administration of estrogen are some of the strategies implemented to decrease bleeding complications during FFB. (Cordasco et al., 1991)

#### **Bronchoscopy in patients with cardiac ischemia**

Hypoxia is a relatively common complication of FFB, which may predispose to cardiac arrhythmias. (Katz et al., 1981) Cardiovascular stress and hypertension are common and can result in cardiovascular changes during bronchoscopy especially if they have cardiac risk factors.( Davies et al.,1997) Acute myocardial infarction (AMI) is generally considered to increase the risk of FFB. A retrospective study concluded that bronchoscopy is safe in the immediate post-AMI period as long as the patient does not have active ischemia at the time of the procedure; the mean period between the AMI and FFB was 11.7 days. The risks of bronchoscopy are thought to be reduced 4–6 weeks after myocardial infarction. (Dweik et al., 1996; Kvale, 1996; American College of Cardiology and American Heart Association Taskforce, 1996; Dunagan et al., 1998; Bein &Pfeifer, 1997)

#### **Bronchoscopy in patients with obstructive airway disease**

Asthma has been associated with laryngospasm or bronchospasm complicating bronchoscopy. The reported incidence of bronchoscopy induced bronchospasm ranges from 0.02% to 8%. Decrease in FEV1 is seen during FFB and this is more pronounced in asthmatics compared to non asthmatics. In patients with mild asthma, pre procedure use of bronchodilator has not been associated with a decrease in the postoperative FEV1, however, the use of pre-bronchoscopy bronchodilator is associated with blunting of the post bronchoscopy decrease in FEV1 in asthmatics with more severe disease.( Fish & Peterman 1979; Djukanovic et al., 1991;Van Vyve et al., 1992; Rankin et al., 1984; Mavritsyn & Lifshits, 1980) In a large multicenter study of over 20,000 bronchoscopies, bronchospasm was reported in 0.004% of all the procedures.(Facciolongo et al., 2009) In general, it is recommended that patients with asthma receive bronchodilator nebulizers before the procedure; taking in consideration that the benefit have been reported mainly in the most severe asthmatic.

The presence of severe chronic obstructive pulmonary disease (COPD) has been shown to increase the complication rate of bronchoscopy. The complication rate is as high as 3% to 5% in severe COPD (FEV1 /FVC <50% or FEV1 <1.2 L) when compared with 0.6% of patients with normal lung function. An arterial blood gas should be considered prior to bronchoscopy for those patients with severe COPD. The judicious use of sedation and monitoring of oxygenation and ventilation permit the safe performance of FFB in selected patients with COPD.( BTS, 2001; Peacock et al., 1994; Hattotuwa et al., 2002) Although there is no data regarding the use of pre-procedure bronchodilators in COPD, we routinely use

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 19

Respiratory involvement is common in the critically ill patient in the intensive care unit (ICU) with 30 to 50% of the admissions requiring the use of mechanical ventilation. Fiberoptic bronchoscopy remains a very valuable tool in the evaluation and management of these patients as well as to evaluate complications of mechanical ventilation especially atelectasis and ventilator associated pneumonias (VAP). Bronchoscopy in the ICU plays a role as a diagnostic and therapeutic tool. Many of the indications for bronchoscopy in the

The routine FFB with BAL is frequently performed in patients on mechanical ventilation (MV). Use of transbronchial biopsy in this group of patient's remains low and underutilized

In a non intubated patient a regular 5.7 mm bronchoscope usually occupies 10 % of the tracheal cross sectional area and is of no physiological consequence. The consequences on the respiratory mechanics have been described in detail by Jollier and Chevrolet. (Jolliet & Chevrolet 1992) . A 5.7 mm internal diameter bronchoscope occupies 40% of the total cross-section of a 9 mm internal diameter ETT, 51 % of an 8 mm ETT, and 66% of a 7 mm ETT. This results in the development of intrinsic PEEP and as described, smaller the tube, higher the development of PEEP with the consequent increase in airway pressures. Additionally, functional residual capacity increases by 30% and forced expiratory volume in one second (FEV1) decreases by 40%.( Matsushima et al.,1984) The decrease in the delivered tidal volume leads to hypoventilation and gas exchange abnormalities resulting in hypoxia and hypercapnea. Suctioning during bronchoscopy limits the delivered tidal volume further and up to 200 to 300 ml of delivered volume can be removed with each suctioning. It is therefore recommended that an ETT of at least size 8 or 8.5 mm be used when performing bronchoscopy in intubated patients. (Grossman& Jacobi, 1974; Jolliet &

Cardiovascular consequences of bronchoscopy include arrhythmias secondary to vagotonic effects, hypoxia or hypercapnea. Increased intrinsic PEEP can result in impaired preload and hypotension. Adjustments needed prior to bronchoscopy in a patient on MV include preoxygenation with 100% oxygen and increase in the tidal volume by 30%. Bronchoscopy should be performed on 100% FIO2 and this should be continued into the post bronchoscopy period. Peak airway pressure alarm limit should be increased before the procedure to account for the increase in pressure on introduction of the scope and ensure delivery of adequate tidal volume and adequate ventilation. It is our personal experience to withdraw the scope and allow for ventilation when the SpO2 reaches 90%. In patients who have acute

Bronchoscopic techniques used for procedures done at the bedside of the patient in the ICU

1. Review the indication for bronchoscopy and review imaging before the procedure

or chronic pre-procedure hypercapnia, the use of ETCO2 monitoring is helpful.

**Bronchoscopy in mechanically ventilated patients – A bed side approach** 

are similar to the ones done in the bronchoscopy suite.

2. Obtain informed consent

ICU overlap with the general indications for the procedure as discussed above.

**5. Bronchoscopy in the intensive care unit** 

**Bronchoscopy on patients on mechanical ventilation** 

Chevrolet 1992))

probably due to the lack of fluoroscopy in the ICU setting.

bronchodilators prior to the bronchoscopy and monitoring is done with pulse oximetry and end tidal CO2 (ETCO2).

#### **Bronchoscopy in the elderly**

Epidemiologic studies have shown a trend in the increase of the "oldest old" or those 85 years of age or older from the absolute number of 3.5 million as measured in 1990 to approximately 15.3 million persons in the year 2050. Proportionately to this trend, this age group might comprise a portion of the population that could need diagnostic and therapeutic bronchoscopy.

A study of FFB in 107 octogenarians revealed no difference in procedural indications, complication rates, or diagnostic yield between octogenarians and non-octogenarians. Despite a significantly lower doses of sedation used in octogenarians, they experienced a predominant complication of oversedation. (Patrick et al., 2003; Knox et al., 1988)

#### **Raised intracranial pressure**

In patients with head injuries, brain tumor or massive stroke, the increase in the intracranial pressure (ICP) can be significant; (Snow& Lucas, 1984, Lee, 1994; Peerless et al., 1995) raising concerns about the safety of bronchoscopy in this setting. A potential complication of bronchoscopy includes an increase in the ICP due to the manipulation of the airways especially during suctioning and excessive coughing. (Rudy et al., 1991) Kerwin et al reported an increase in ICP during bronchoscopy, the concomitant increase in MAP maintained CPP but the increase in MAP was not linear and there was no persistent increase in ICP after the procedure. (Kerwin et al 2000) They suggested that pharmacologic paralysis and heavy sedation should be used and that the bronchoscopy should be performed in the minimum amount of time possible. In general, bronchoscopy carries a low risk in patients with raised ICP in patients with intracranial space occupying lesions. (Bajwaet al., 1993)

#### **Bronchoscopy in pediatric population**

Although the availability of bronchoscopy has been a major advance in adult pulmonary medicine, the role of FFB in pediatrics has remained less well defined. The last 20 years has seen an increase in the use of FFB for the evaluation of respiratory disorders in children. (Nicolai, 2001; Barbato et al., 1997) The main indications for bronchoscopy in children includes the evaluation of stridor, persistent wheezing, or a suspected foreign body, abnormal chest roentgenogram, airway evaluation in patients with tracheostomy, airway obstruction , hoarseness, recurrent pneumonia , chronic cough and hemoptysis.

Overall, the diagnostic yield in this population has been reported in the range of 75% to 88% of cases. (Brown et al., 1983; Wood, 1985; Martinot et al., 1997)

Several studies looking at the safety of bronchoscopy in the pediatric population have reported a low complication rate of less than 2%. De Blic study in 1328 children that underwent FFB under conscious sedation reported 5.2% of minor complications which included moderate and transient episodes of desaturation, excessive coughing and nausea, transient laryngospasm and epistaxis. Major complications were seen in 1.7% of cases and included oxygen desaturation to less than 90%, laryngospasm and bronchospasm, and pneumothorax.( J. de Blic et al 2002) The high diagnostic yield and low complication rate strongly support the use of the FFB in the diagnostic evaluation of infants and children who have a variety of pulmonary problems.( Wood, 1984, 1985)

#### **5. Bronchoscopy in the intensive care unit**

18 Global Perspectives on Bronchoscopy

bronchodilators prior to the bronchoscopy and monitoring is done with pulse oximetry and

Epidemiologic studies have shown a trend in the increase of the "oldest old" or those 85 years of age or older from the absolute number of 3.5 million as measured in 1990 to approximately 15.3 million persons in the year 2050. Proportionately to this trend, this age group might comprise a

A study of FFB in 107 octogenarians revealed no difference in procedural indications, complication rates, or diagnostic yield between octogenarians and non-octogenarians. Despite a significantly lower doses of sedation used in octogenarians, they experienced a

In patients with head injuries, brain tumor or massive stroke, the increase in the intracranial pressure (ICP) can be significant; (Snow& Lucas, 1984, Lee, 1994; Peerless et al., 1995) raising concerns about the safety of bronchoscopy in this setting. A potential complication of bronchoscopy includes an increase in the ICP due to the manipulation of the airways especially during suctioning and excessive coughing. (Rudy et al., 1991) Kerwin et al reported an increase in ICP during bronchoscopy, the concomitant increase in MAP maintained CPP but the increase in MAP was not linear and there was no persistent increase in ICP after the procedure. (Kerwin et al 2000) They suggested that pharmacologic paralysis and heavy sedation should be used and that the bronchoscopy should be performed in the minimum amount of time possible. In general, bronchoscopy carries a low risk in patients with raised ICP in patients with intracranial space occupying lesions. (Bajwaet al., 1993)

Although the availability of bronchoscopy has been a major advance in adult pulmonary medicine, the role of FFB in pediatrics has remained less well defined. The last 20 years has seen an increase in the use of FFB for the evaluation of respiratory disorders in children. (Nicolai, 2001; Barbato et al., 1997) The main indications for bronchoscopy in children includes the evaluation of stridor, persistent wheezing, or a suspected foreign body, abnormal chest roentgenogram, airway evaluation in patients with tracheostomy, airway

Overall, the diagnostic yield in this population has been reported in the range of 75% to 88%

Several studies looking at the safety of bronchoscopy in the pediatric population have reported a low complication rate of less than 2%. De Blic study in 1328 children that underwent FFB under conscious sedation reported 5.2% of minor complications which included moderate and transient episodes of desaturation, excessive coughing and nausea, transient laryngospasm and epistaxis. Major complications were seen in 1.7% of cases and included oxygen desaturation to less than 90%, laryngospasm and bronchospasm, and pneumothorax.( J. de Blic et al 2002) The high diagnostic yield and low complication rate strongly support the use of the FFB in the diagnostic evaluation of infants and children who

obstruction , hoarseness, recurrent pneumonia , chronic cough and hemoptysis.

of cases. (Brown et al., 1983; Wood, 1985; Martinot et al., 1997)

have a variety of pulmonary problems.( Wood, 1984, 1985)

portion of the population that could need diagnostic and therapeutic bronchoscopy.

predominant complication of oversedation. (Patrick et al., 2003; Knox et al., 1988)

end tidal CO2 (ETCO2).

**Bronchoscopy in the elderly** 

**Raised intracranial pressure** 

**Bronchoscopy in pediatric population** 

Respiratory involvement is common in the critically ill patient in the intensive care unit (ICU) with 30 to 50% of the admissions requiring the use of mechanical ventilation. Fiberoptic bronchoscopy remains a very valuable tool in the evaluation and management of these patients as well as to evaluate complications of mechanical ventilation especially atelectasis and ventilator associated pneumonias (VAP). Bronchoscopy in the ICU plays a role as a diagnostic and therapeutic tool. Many of the indications for bronchoscopy in the ICU overlap with the general indications for the procedure as discussed above.

#### **Bronchoscopy on patients on mechanical ventilation**

The routine FFB with BAL is frequently performed in patients on mechanical ventilation (MV). Use of transbronchial biopsy in this group of patient's remains low and underutilized probably due to the lack of fluoroscopy in the ICU setting.

In a non intubated patient a regular 5.7 mm bronchoscope usually occupies 10 % of the tracheal cross sectional area and is of no physiological consequence. The consequences on the respiratory mechanics have been described in detail by Jollier and Chevrolet. (Jolliet & Chevrolet 1992) . A 5.7 mm internal diameter bronchoscope occupies 40% of the total cross-section of a 9 mm internal diameter ETT, 51 % of an 8 mm ETT, and 66% of a 7 mm ETT. This results in the development of intrinsic PEEP and as described, smaller the tube, higher the development of PEEP with the consequent increase in airway pressures. Additionally, functional residual capacity increases by 30% and forced expiratory volume in one second (FEV1) decreases by 40%.( Matsushima et al.,1984) The decrease in the delivered tidal volume leads to hypoventilation and gas exchange abnormalities resulting in hypoxia and hypercapnea. Suctioning during bronchoscopy limits the delivered tidal volume further and up to 200 to 300 ml of delivered volume can be removed with each suctioning. It is therefore recommended that an ETT of at least size 8 or 8.5 mm be used when performing bronchoscopy in intubated patients. (Grossman& Jacobi, 1974; Jolliet & Chevrolet 1992))

Cardiovascular consequences of bronchoscopy include arrhythmias secondary to vagotonic effects, hypoxia or hypercapnea. Increased intrinsic PEEP can result in impaired preload and hypotension. Adjustments needed prior to bronchoscopy in a patient on MV include preoxygenation with 100% oxygen and increase in the tidal volume by 30%. Bronchoscopy should be performed on 100% FIO2 and this should be continued into the post bronchoscopy period. Peak airway pressure alarm limit should be increased before the procedure to account for the increase in pressure on introduction of the scope and ensure delivery of adequate tidal volume and adequate ventilation. It is our personal experience to withdraw the scope and allow for ventilation when the SpO2 reaches 90%. In patients who have acute or chronic pre-procedure hypercapnia, the use of ETCO2 monitoring is helpful.

Bronchoscopic techniques used for procedures done at the bedside of the patient in the ICU are similar to the ones done in the bronchoscopy suite.

#### **Bronchoscopy in mechanically ventilated patients – A bed side approach**


Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 21

Torres & el-Ebiary reviewed 23 studies that evaluated the accuracy of BAL to diagnose VAP in a total of 957 patients. In this review, BAL had a mean sensitivity of 73% (range 22 to 100%) and mean specificity of 82%. The presence of intracellular organisms in BAL was

In patients with AIDS, BAL had a diagnostic accuracy of 89 to 98% in the diagnosis of PJP. (Huang et al., 2006) In a prospective multicentre trial in hematology and oncology patients there was no difference between bronchoscopic BAL versus other strategies in establishing diagnosis. (Azoulay et al., 2008) However, FFB-BAL was the only conclusive investigation in a third of patients and induced respiratory deterioration in about half of these cases. A subsequent study by the same investigators showed that noninvasive testing alone was not inferior to noninvasive testing plus FFB-BAL within 24 hours of admission for the

In neutropenic patients with pulmonary infiltrates, the diagnostic yield of BAL was 49% with low complication rates; there were infrequent treatment changes and there was

In patients with diffuse unexplained pulmonary infiltrates, combined BAL and TBBx resulted in diagnosis in 74% of patients and the authors concluded that the benefits of the procedure exceeded the risks. (Bulpa et al 2003) TBBx is useful in distinguishing infections

Management of critically ill patient on mechanical ventilation with unclear lung findings represents a challenge to the clinician. In cases where FFB-BAL and all noninvasive studies have been non diagnostics, TBBx or surgical lung biopsy is recommended. This is compounded by the fact that there are few studies looking into the role of TBBx in ventilated

Flexible bronchoscopy is an extremely safe procedure with a low incidence of complications.(Dweik et al., 1996; BTS, 2001;Prakash at al., 1991;ATS,1987) One study reported a mortality rate of 0.01% and a major complication rate of 0.08% in a series of 24521 procedures, and another a mortality of 0.02% and a 0.3% rate of major complications in a series of around 48 000 cases. (Kvale, 1996; Zavala, 1975; Credle et al., 1974; Pue & Pacht,

A multicenter, prospective study describing the practice of bronchoscopy in the United States revealed adverse events in 35% of cases, most of them mild (sore throat 10%, hemoptysis 8%, bleeding 4%, cough 3%). Severe adverse events occurred in 10% and included hospitalizations for cardiac arrhythmias, exacerbation of chronic obstructive pulmonary disease, and hypoxia. The mortality rate was 2% , a rate higher than previously

Major life threatening complications include respiratory depression, pneumonia, pneumothorax, airway obstruction, cardio-respiratory arrest, arrhythmias, and pulmonary

identification of the cause for acute respiratory failure. (Azoulay et al., 2010)

**BAL** 

**TBBx** 

specific for VAP. (Torres & El-Ebiary 2000)

improved survival.( Gruson et al., 2000)

from rejection in lung transplant patients.

**6. Safety and contraindications of bronchoscopy** 

patients. (Papazian et al., 1998)

1995; Surrat et al., 1979)

reported. (Bechara et al., 2005)


#### **Diagnostic yield of bronchoscopy in mechanically ventilated patients**

The diagnostic yield of FFB depends on the indication and the comorbid clinical status. Different bronchoscopic techniques are associated with different diagnostic yield in this group of patients.

#### **Protected brush**

Pooled results of 18 studies of PSB technique was evaluated in a total of 795 critically ill patients. The overall accuracy of this diagnostic method for diagnosing health care associated pneumonia (HCAP) was high, with a sensitivity of 89% and a specificity of 94%. Prior anti microbial therapy decreases the diagnostic yield. (Chastre & Fagon, 2002)

#### **BAL**

20 Global Perspectives on Bronchoscopy

3. Inspect the ETT or tracheostomy size. If ≥ 8mm then a standard 5.7mm outer diameter bronchoscope can be used. If the artificial airway tube is smaller, then a smaller size scope is needed. Shorten the ETT by cutting the distal end to facilitate inspection of the distal tracheobronchial tree. Attach Portex adapter to facilitate ventilation during bronchoscopy. Oral airway or bite guard is recommended to prevent trauma to the

4. Increase FiO2 to 100 percent 15 minutes before the procedure and make ventilator adjustments. In volume assist modes the peak pressure limit is increased and in pressure control assist mode the pressure control needs to be increased to compensate

5. Time out and sedation as per hospital policies. On patients with sedative infusion drips,

7. Patient should be monitored with continuous EKG, SpO2 and ETCO2 for those with hypercapnea. Blood pressure should be monitored every 5 minutes during the

8. Lubricate bronchoscope and insert into the ETT/tracheostomy via the adapter. Topical anesthesia is achieved with topical lidocaine application into the trachea, carinal and main stem bronchi. Recommended maximal dose of lidocaine is 4-5 ml/kg ideal body weight or 300 mg per procedure. Minimal use of suction to prevent loss of tidal volume.

9. After inspection of the tracheobronchial tree, BAL is performed. The exception to this rule is suspected infection, in which case locate the bronchopulmonary segment of interest and perform lavage. This decreases the chances of contamination of the

11. To perform the TBBx, apply topical lidocaine to the segment of interest and perform biopsy as described under techniques. We take special care that the patient is well sedated and not fighting the ventilator or coughing excessively. We routinely disconnect patient from the respirator for a couple of seconds during initial part of forceps withdrawal. If there is any instability pull out the scope and ventilate patient.

12. Post procedure check peak airway and plateau pressure and obtain a chest

The diagnostic yield of FFB depends on the indication and the comorbid clinical status. Different bronchoscopic techniques are associated with different diagnostic yield in this

Pooled results of 18 studies of PSB technique was evaluated in a total of 795 critically ill patients. The overall accuracy of this diagnostic method for diagnosing health care associated pneumonia (HCAP) was high, with a sensitivity of 89% and a specificity of 94%.

Prior anti microbial therapy decreases the diagnostic yield. (Chastre & Fagon, 2002)

10. The BAL is performed as described under bronchoscopic techniques.

Bronchoscopy can be continued after the situation resolves.

**Diagnostic yield of bronchoscopy in mechanically ventilated patients** 

roentgenogram to evaluate for complications.

for the increased resistance generated due to the insertion of the scope.

scope.

procedure

specimen.

group of patients. **Protected brush**

an initial bolus is recommended

6. Document peak air way pressure before procedure

Restrict suctioning to less than 3 seconds.

Torres & el-Ebiary reviewed 23 studies that evaluated the accuracy of BAL to diagnose VAP in a total of 957 patients. In this review, BAL had a mean sensitivity of 73% (range 22 to 100%) and mean specificity of 82%. The presence of intracellular organisms in BAL was specific for VAP. (Torres & El-Ebiary 2000)

In patients with AIDS, BAL had a diagnostic accuracy of 89 to 98% in the diagnosis of PJP. (Huang et al., 2006) In a prospective multicentre trial in hematology and oncology patients there was no difference between bronchoscopic BAL versus other strategies in establishing diagnosis. (Azoulay et al., 2008) However, FFB-BAL was the only conclusive investigation in a third of patients and induced respiratory deterioration in about half of these cases. A subsequent study by the same investigators showed that noninvasive testing alone was not inferior to noninvasive testing plus FFB-BAL within 24 hours of admission for the identification of the cause for acute respiratory failure. (Azoulay et al., 2010)

In neutropenic patients with pulmonary infiltrates, the diagnostic yield of BAL was 49% with low complication rates; there were infrequent treatment changes and there was improved survival.( Gruson et al., 2000)

#### **TBBx**

In patients with diffuse unexplained pulmonary infiltrates, combined BAL and TBBx resulted in diagnosis in 74% of patients and the authors concluded that the benefits of the procedure exceeded the risks. (Bulpa et al 2003) TBBx is useful in distinguishing infections from rejection in lung transplant patients.

Management of critically ill patient on mechanical ventilation with unclear lung findings represents a challenge to the clinician. In cases where FFB-BAL and all noninvasive studies have been non diagnostics, TBBx or surgical lung biopsy is recommended. This is compounded by the fact that there are few studies looking into the role of TBBx in ventilated patients. (Papazian et al., 1998)

#### **6. Safety and contraindications of bronchoscopy**

Flexible bronchoscopy is an extremely safe procedure with a low incidence of complications.(Dweik et al., 1996; BTS, 2001;Prakash at al., 1991;ATS,1987) One study reported a mortality rate of 0.01% and a major complication rate of 0.08% in a series of 24521 procedures, and another a mortality of 0.02% and a 0.3% rate of major complications in a series of around 48 000 cases. (Kvale, 1996; Zavala, 1975; Credle et al., 1974; Pue & Pacht, 1995; Surrat et al., 1979)

A multicenter, prospective study describing the practice of bronchoscopy in the United States revealed adverse events in 35% of cases, most of them mild (sore throat 10%, hemoptysis 8%, bleeding 4%, cough 3%). Severe adverse events occurred in 10% and included hospitalizations for cardiac arrhythmias, exacerbation of chronic obstructive pulmonary disease, and hypoxia. The mortality rate was 2% , a rate higher than previously reported. (Bechara et al., 2005)

Major life threatening complications include respiratory depression, pneumonia, pneumothorax, airway obstruction, cardio-respiratory arrest, arrhythmias, and pulmonary

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 23

experience, and is not readily available in all centers. (Gasparini, 1997; Cortese & McDougaIl

Several studies have shown that patients with uremia, immunosuppression, pulmonary hypertension, liver disease, coagulation disorders, or thrombocytopenia have a higher risk for hemorrhage with transbronchial biopsy(TBBx). (Papin et al., 1985; Zavala, 1976; Borchers

The risk of bleeding during TBBx seems to be unrelated to the size of forceps and is slightly higher in those being mechanically ventilated. (Loube et al., 1993; O'Brien et al., 1997)

In patients with a potential increased risk of bleeding, coagulation profile should be checked before bronchoscopy. There is no information about what constitutes a "safe" level for clotting in this context. Transfusion guidelines and expert opinions recommend platelet counts of 20,000–50,000/mm3 for FFB with BAL and greater than 50,000/mm3 for TBBx. It is

Thrombocytopenia (platelet count <150.000 mm3) is seen in 35 to 40% of critically ill medical patients (Vanderschueren et al., 2000; Strauss et al., 2002), with surgical and trauma patients

Patients with coagulopathy are at a high risk for bleeding with brushings and biopsy; Weiss et al., reported 12% of complications in patients with significant thrombocytopenia after

In patient taking oral anticoagulants, published guidelines for managing anticoagulation in the perioperative period are relevant. These state that "the short term risk of thromboembolism in patients with mechanical heart valves when not anticoagulated is very small". (Brickey & Lawlor, 1999; British Committee for Standards in Haematology, 1998)

In patients on anticoagulation undergoing transbronchial biopsy, unfractionated heparin drips should be stopped 6 hours prior and low molecular weight heparin should be held the

The use of aspirin alone in humans has not been associated with an increase in bleeding complications from TBBx and therefore there are no recommendations to stop the

The data from aspirin cannot be generalized to clopidogrel use because its mechanism of action differs from that of aspirin. Several studies indicate an increased risk of bleeding when clopidogrel is combined with other antiplatelet drugs. (Hongo et al., 2002; Yende & Wunderink, 2001) A study in 604 patients without underlying coagulation problems who underwent TBBx while on clopidogrel with or without aspirin revealed an increased risk of bleeding after the lung biopsy. Marked bleeding was observed in most patients receiving clopidogrel and in all patients receiving clopidogrel combined with aspirin. On the basis of these results, it is recommended that clopidogrel should be stopped 5 to 7 days before TBBx to ensure patient safety. The indications for TBBx need to be clearly defined, as it means stopping a beneficial medication for patients with cardiovascular

recommended that platelets be transfused following those guidelines. (Rebulla, 2001)

bronchoscopy with BAL, but serious complications were rare. (Weiss et al., 1993)

having a higher incidence of thrombocytopenia. ((Stephan et al., 1999)

evening prior and on the day of the procedure

diseases. (Ernst et al., 2006)

medication before this procedure. (Herth et al., 2002)

1979; Yung, 2003; Liam et al., 2007)

**6.3 Bleeding complications** 

& Beamis 1996)

edema. Major complications are partly because of the cardiovascular effects of bronchoscopy, leading to an increase in blood pressure and heart rate causing arrhythmias and cardiovascular ischemia. Oxygen desaturation can occur because of the procedure itself or respiratory depression by sedative drugs leading to hypoxemia and increased risk of arrhythmias and ischemia. Bronchoscopy is performed in different settings, varying from local to general anesthesia with intubation; the choice of the way in which the bronchoscopy is performed is more a matter of personal experience and choice than of evidence-based medicine. Comparison of rigid bronchoscopy under general anesthesia and flexible fiberoptic bronchoscopy reveals that FFB with topical anesthesia has a safer profile than rigid bronchoscopy. (BTS, 2001; Hattotuwa et al., 2002; Surrat et al., 1979; Pereira et al., 1978; Lundgren et al.,1982; Davies et al.,1997)

Minor non-life threatening complications include, in order of frequency, vasovagal reactions, fever, cardiac arrhythmias, hemorrhage, nausea and vomiting. Post-bronchoscopy fever occurs in approximately 5% to 16% of the patients, with pulmonary infiltrate occurring in 0.6% of all cases. The self-limiting fever is usually not indicative of pneumonia and may be due to transient bacteremia, translocation of endotoxins or release of inflammatory mediators. (BTS, 2001; Pereira et al., 1978; de Castro & Violan,1996)

Complication rates that are related specifically to the procedure of transbronchial biopsies are higher, with pneumothorax reported in 1 to 5% of cases and mild hemorrhage in 9%. (Bechara et al., 2005; Zavala, 1978; Hanson et al., 1976)

#### **6.1 Pneumothorax**

Pneumothorax is very uncommon after FFB; however, a major pneumothorax requiring drainage has been reported to occur in 3.5% of FFB with TBBx. The incidence of pneumothorax with TBBx is as high as 14% for patients on mechanical ventilation. Symptoms and/or signs of a pneumothorax may be delayed after TBBx but it is very uncommon for a pneumothorax to develop after an hour of TBBX. (Lindholm et al., 1974) About 50% of patients who develop pneumothorax will require drainage.

#### **6.2 Fluoroscopy for bronchoscopy**

The use of fluoroscopy does not appear to reduce the frequency of pneumothorax, especially in non-mechanically ventilated patients. (Zink et al., 2007; O'Brien et al., 1997; Milman et al., 1993) Literature regarding non fluoroscopy guided transbronchial biopsy in patients on mechanical ventilation is scarce. In most of the ICU's fluoroscopy is not available which limits the use of TBBx in mechanically ventilated patients. In smaller series, the rate of pneumothorax varies from 12 to 27% (Bulpa et al.,2003; Pincus et al., 1987;) and 10.4% in larger series ( O'Brien et al., 1997). Risk of pneumothorax is directly proportional to the number of biopsies attempted; Descombes et al reported 38% and 69% yields with 1–3, and 6–10 specimens, respectively. (Descombes et al., 1997)

At our institution, we perform 1-3 biopsies on patients on mechanical ventilation without the use of fluoroscopy; otherwise, to obtain more biopsies we do the procedure in the operating room under fluoroscopic guidance.

In general, the use of fluoroscopy increases the diagnostic yield from TBBx in focal lung lesions. Fluoroscopy carries the limitation of being time consuming, requires some experience, and is not readily available in all centers. (Gasparini, 1997; Cortese & McDougaIl 1979; Yung, 2003; Liam et al., 2007)

#### **6.3 Bleeding complications**

22 Global Perspectives on Bronchoscopy

edema. Major complications are partly because of the cardiovascular effects of bronchoscopy, leading to an increase in blood pressure and heart rate causing arrhythmias and cardiovascular ischemia. Oxygen desaturation can occur because of the procedure itself or respiratory depression by sedative drugs leading to hypoxemia and increased risk of arrhythmias and ischemia. Bronchoscopy is performed in different settings, varying from local to general anesthesia with intubation; the choice of the way in which the bronchoscopy is performed is more a matter of personal experience and choice than of evidence-based medicine. Comparison of rigid bronchoscopy under general anesthesia and flexible fiberoptic bronchoscopy reveals that FFB with topical anesthesia has a safer profile than rigid bronchoscopy. (BTS, 2001; Hattotuwa et al., 2002; Surrat et al., 1979; Pereira et al., 1978;

Minor non-life threatening complications include, in order of frequency, vasovagal reactions, fever, cardiac arrhythmias, hemorrhage, nausea and vomiting. Post-bronchoscopy fever occurs in approximately 5% to 16% of the patients, with pulmonary infiltrate occurring in 0.6% of all cases. The self-limiting fever is usually not indicative of pneumonia and may be due to transient bacteremia, translocation of endotoxins or release of inflammatory

Complication rates that are related specifically to the procedure of transbronchial biopsies are higher, with pneumothorax reported in 1 to 5% of cases and mild hemorrhage in 9%.

Pneumothorax is very uncommon after FFB; however, a major pneumothorax requiring drainage has been reported to occur in 3.5% of FFB with TBBx. The incidence of pneumothorax with TBBx is as high as 14% for patients on mechanical ventilation. Symptoms and/or signs of a pneumothorax may be delayed after TBBx but it is very uncommon for a pneumothorax to develop after an hour of TBBX. (Lindholm et al., 1974)

The use of fluoroscopy does not appear to reduce the frequency of pneumothorax, especially in non-mechanically ventilated patients. (Zink et al., 2007; O'Brien et al., 1997; Milman et al., 1993) Literature regarding non fluoroscopy guided transbronchial biopsy in patients on mechanical ventilation is scarce. In most of the ICU's fluoroscopy is not available which limits the use of TBBx in mechanically ventilated patients. In smaller series, the rate of pneumothorax varies from 12 to 27% (Bulpa et al.,2003; Pincus et al., 1987;) and 10.4% in larger series ( O'Brien et al., 1997). Risk of pneumothorax is directly proportional to the number of biopsies attempted; Descombes et al reported 38% and 69% yields with 1–3, and

At our institution, we perform 1-3 biopsies on patients on mechanical ventilation without the use of fluoroscopy; otherwise, to obtain more biopsies we do the procedure in the

In general, the use of fluoroscopy increases the diagnostic yield from TBBx in focal lung lesions. Fluoroscopy carries the limitation of being time consuming, requires some

mediators. (BTS, 2001; Pereira et al., 1978; de Castro & Violan,1996)

About 50% of patients who develop pneumothorax will require drainage.

(Bechara et al., 2005; Zavala, 1978; Hanson et al., 1976)

6–10 specimens, respectively. (Descombes et al., 1997)

operating room under fluoroscopic guidance.

Lundgren et al.,1982; Davies et al.,1997)

**6.2 Fluoroscopy for bronchoscopy** 

**6.1 Pneumothorax** 

Several studies have shown that patients with uremia, immunosuppression, pulmonary hypertension, liver disease, coagulation disorders, or thrombocytopenia have a higher risk for hemorrhage with transbronchial biopsy(TBBx). (Papin et al., 1985; Zavala, 1976; Borchers & Beamis 1996)

The risk of bleeding during TBBx seems to be unrelated to the size of forceps and is slightly higher in those being mechanically ventilated. (Loube et al., 1993; O'Brien et al., 1997)

In patients with a potential increased risk of bleeding, coagulation profile should be checked before bronchoscopy. There is no information about what constitutes a "safe" level for clotting in this context. Transfusion guidelines and expert opinions recommend platelet counts of 20,000–50,000/mm3 for FFB with BAL and greater than 50,000/mm3 for TBBx. It is recommended that platelets be transfused following those guidelines. (Rebulla, 2001)

Thrombocytopenia (platelet count <150.000 mm3) is seen in 35 to 40% of critically ill medical patients (Vanderschueren et al., 2000; Strauss et al., 2002), with surgical and trauma patients having a higher incidence of thrombocytopenia. ((Stephan et al., 1999)

Patients with coagulopathy are at a high risk for bleeding with brushings and biopsy; Weiss et al., reported 12% of complications in patients with significant thrombocytopenia after bronchoscopy with BAL, but serious complications were rare. (Weiss et al., 1993)

In patient taking oral anticoagulants, published guidelines for managing anticoagulation in the perioperative period are relevant. These state that "the short term risk of thromboembolism in patients with mechanical heart valves when not anticoagulated is very small". (Brickey & Lawlor, 1999; British Committee for Standards in Haematology, 1998)

In patients on anticoagulation undergoing transbronchial biopsy, unfractionated heparin drips should be stopped 6 hours prior and low molecular weight heparin should be held the evening prior and on the day of the procedure

The use of aspirin alone in humans has not been associated with an increase in bleeding complications from TBBx and therefore there are no recommendations to stop the medication before this procedure. (Herth et al., 2002)

The data from aspirin cannot be generalized to clopidogrel use because its mechanism of action differs from that of aspirin. Several studies indicate an increased risk of bleeding when clopidogrel is combined with other antiplatelet drugs. (Hongo et al., 2002; Yende & Wunderink, 2001) A study in 604 patients without underlying coagulation problems who underwent TBBx while on clopidogrel with or without aspirin revealed an increased risk of bleeding after the lung biopsy. Marked bleeding was observed in most patients receiving clopidogrel and in all patients receiving clopidogrel combined with aspirin. On the basis of these results, it is recommended that clopidogrel should be stopped 5 to 7 days before TBBx to ensure patient safety. The indications for TBBx need to be clearly defined, as it means stopping a beneficial medication for patients with cardiovascular diseases. (Ernst et al., 2006)

Role of Flexible-Bronchoscopy in Pulmonary and Critical Care Practice 25

accurate evaluations of the tracheobronchial tree and to perform an ever-increasing array of

We believe that a well trained pulmonologist should continue using the bronchoscope in order to diagnose the most commonly encountered pulmonary conditions. The idea of having an "optimal bronchoscopist" who is highly skilled in all the bronchoscopic techniques and able to handle flexible and rigid scope in adults and pediatric population as Prakash and Stubbs discussed in their 1994 publication is probably not feasible at this point on time. (Prakash & Stubbs 1994) Pulmonologists need to be able to identify those patients that could benefit from more invasive or sophisticated bronchoscopic procedures and refer

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**8. References** 

#### **6.4 Contraindications**

The contraindications to bronchoscopy must always be considered in relationship to the expected benefits and clinical consequences. The determining factors are, in addition to the clinical status and prognosis of the patient, the technical difficulties of the procedure, and the skills and experience of the endoscopist. There are no controlled studies of the factors which may make a patient totally unfit for the procedure, so a decision to perform a bronchoscopy is a balance between the likely benefit of obtaining diagnostic material (including therapeutic benefit) and an assessment of the likely risk for complications in that individual patient. (BTS, 2001; ATS, 1987; Ernst et al.,2003; Wood-Baker et al., 2001)

Relative contraindications to bronchoscopy include severe respiratory insufficiency when bronchoscopy will be non-therapeutic, inability to maintain a patent airway and severe cardiovascular instability. Coagulopathy when biopsy is considered and severe generalized debilitated status are other relative factors to be considered prior to bronchoscopy.

Careful planning and taking all appropriate precautions prior to the bronchoscopy cannot be overemphasized in those patients with myocardial infarction within the last 4 weeks and patients with severe hypoxemia who could benefit from intubation prior to the bronchoscopy.

For those patients with severe renal or coagulation impairment, transmissible infection (e.g. active pulmonary tuberculosis) and the very uncooperative patient the benefit of the procedure must be weighed carefully.

Additionally caution is advised in patients on mechanical ventilation with high PEEP, hypoxia requiring high supplemental oxygen and electrolyte abnormalities. In unstable patients it is recommended to stabilize the respiratory status before FFB and this may include intubation and mechanical ventilation. (Crosby et al.,1998; Henderson et al.,2004; Alamoudi et al.,2000;Becker at al., 1991)

#### **7. Conclusion**

The development of flexible bronchoscopy in the late 1960s revolutionized the care of patients with lung and airway problems. The flexible bronchoscope has almost completely supplanted the rigid scope for the routine diagnostic evaluation of lung diseases. The technique is acceptable to the patient, is safe and allows a more complete examination of the bronchial tree and is ideal for a variety of other diagnostic procedures such as transbronchial biopsy, bronchial lavage and needle aspiration. Bronchoscopy remains a very valuable tool for both diagnostic and therapeutic procedures for a variety of respiratory conditions encountered in clinical practice including in critically ill patients. Bronchoscopy has a definite diagnostic role in those patients suspected of having pulmonary malignancy or some diffuse lung diseases like sarcoidosis and infections in the immunosuppressed host. In experienced hands, the bronchoscope is an invaluable diagnostic and therapeutic tool in the ICU that at present is probably underused.

Appropriate indication, experience of the bronchoscopist and careful attention to detail results in a high diagnostic yield with a low complication rate even with the inclusion of needle aspiration and biopsies. The current advances in technology, imaging and information processing continue to improve the ability to perform minimally invasive, accurate evaluations of the tracheobronchial tree and to perform an ever-increasing array of diagnostic, staging, therapeutic, and palliative interventions.

We believe that a well trained pulmonologist should continue using the bronchoscope in order to diagnose the most commonly encountered pulmonary conditions. The idea of having an "optimal bronchoscopist" who is highly skilled in all the bronchoscopic techniques and able to handle flexible and rigid scope in adults and pediatric population as Prakash and Stubbs discussed in their 1994 publication is probably not feasible at this point on time. (Prakash & Stubbs 1994) Pulmonologists need to be able to identify those patients that could benefit from more invasive or sophisticated bronchoscopic procedures and refer them to centers of excellence with an interventional pulmonologist.

#### **8. References**

24 Global Perspectives on Bronchoscopy

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Relative contraindications to bronchoscopy include severe respiratory insufficiency when bronchoscopy will be non-therapeutic, inability to maintain a patent airway and severe cardiovascular instability. Coagulopathy when biopsy is considered and severe generalized

Careful planning and taking all appropriate precautions prior to the bronchoscopy cannot be overemphasized in those patients with myocardial infarction within the last 4 weeks and patients with severe hypoxemia who could benefit from intubation prior to the

For those patients with severe renal or coagulation impairment, transmissible infection (e.g. active pulmonary tuberculosis) and the very uncooperative patient the benefit of the

Additionally caution is advised in patients on mechanical ventilation with high PEEP, hypoxia requiring high supplemental oxygen and electrolyte abnormalities. In unstable patients it is recommended to stabilize the respiratory status before FFB and this may include intubation and mechanical ventilation. (Crosby et al.,1998; Henderson et al.,2004;

The development of flexible bronchoscopy in the late 1960s revolutionized the care of patients with lung and airway problems. The flexible bronchoscope has almost completely supplanted the rigid scope for the routine diagnostic evaluation of lung diseases. The technique is acceptable to the patient, is safe and allows a more complete examination of the bronchial tree and is ideal for a variety of other diagnostic procedures such as transbronchial biopsy, bronchial lavage and needle aspiration. Bronchoscopy remains a very valuable tool for both diagnostic and therapeutic procedures for a variety of respiratory conditions encountered in clinical practice including in critically ill patients. Bronchoscopy has a definite diagnostic role in those patients suspected of having pulmonary malignancy or some diffuse lung diseases like sarcoidosis and infections in the immunosuppressed host. In experienced hands, the bronchoscope is an invaluable diagnostic and therapeutic tool in

Appropriate indication, experience of the bronchoscopist and careful attention to detail results in a high diagnostic yield with a low complication rate even with the inclusion of needle aspiration and biopsies. The current advances in technology, imaging and information processing continue to improve the ability to perform minimally invasive,

individual patient. (BTS, 2001; ATS, 1987; Ernst et al.,2003; Wood-Baker et al., 2001)

debilitated status are other relative factors to be considered prior to bronchoscopy.

**6.4 Contraindications** 

bronchoscopy.

**7. Conclusion** 

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**2** 

*USA* 

**Monitoring, Sedation, and Anesthesia** 

**for Flexible Fiberoptic Bronchoscopy** 

*1Brooke Army Medical Center, Fort Sam Houston, Texas 2Womack Army Medical Center, Fort Bragg, North Carolina 3Brooke Army Medical Center, Fort Sam Houston, Texas \**

Michael J. Morris1, Herbert P. Kwon2 and Thomas B. Zanders3

Since the advent of flexible fiberoptic bronchoscopy (FFB) in the 1970's, the use of sedation and topical anesthesia has allowed the practice of bronchoscopy, specifically FFB, to evolve from the operating room to the outpatient setting. Early techniques of general anesthesia and regional blockade of nerves innervating the airway have been largely replaced by improved techniques of patient monitoring, intravenous conscious sedation, and application of topical anesthetics in the airway. Today the bronchoscopist, in addition to basic FFB techniques such as bronchoalveolar lavage and transbronchial biopsy, can also perform complicated procedures such as removal of foreign bodies, ablation of airway tumors, and endobronchial stenting, all in the outpatient bronchoscopy suite. A continued emphasis has been placed on improvements in patient safety due to the complexities of the procedure itself, but also the role of conscious sedation and topical anesthetics to ensure maximal performance by the bronchoscopist to achieve the desired goal of successful biopsy or other interventions while the patient remains comfortable throughout the entire procedure. A full understanding of the patient's medical history, underlying risk factors such as cardiovascular and pulmonary disease, and medication use is required to plan the

There is some expert consensus guidance published on the use of sedation and topical anesthesia during FFB. The National Institutes of Health published a workshop summary on the investigational use of FFB in patients with asthma in 1985 (National Institutes of Health [NIH], 1985). Further recommendations for investigational FFB in asthmatics was provided in 1991 and commented on potential hazards, high risk and unsuitable patients, and

\*The opinions or assertions contained herein are the private views of the authors and are not to be construed as reflecting the Department of the Army, Department of the Air Force, or the Department of

No outside funding from any source was received during conduct of this research or preparation of this manuscript. Dr. Morris is a paid speaker for Spiriva by Boehringer-Ingelheim/Pfizer. The other authors

**1. Introduction** 

requirements for the FFB.

Defense.

**1.1 Guidelines for bronchoscopy** 

have no financial conflicts to disclose.


### **Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy**

Michael J. Morris1, Herbert P. Kwon2 and Thomas B. Zanders3 *1Brooke Army Medical Center, Fort Sam Houston, Texas 2Womack Army Medical Center, Fort Bragg, North Carolina 3Brooke Army Medical Center, Fort Sam Houston, Texas \* USA* 

#### **1. Introduction**

34 Global Perspectives on Bronchoscopy

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Wood RE. (1985). The diagnostic effectiveness of the flexible bronchoscope in children Pediatric Pulmonology. 1985; 1:188–192 DOI: 10. 1002/ppul. 1950010404 Wood-Baker R, Burdon J, McGregor A, Robinson P & Seal P. (2001). Fiber-optic

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Zavala DC. (1978). Complications following fiberoptic bronchoscopy. Chest 1978; 73:783–5. Zink A, Fritsch K, Eich C & Thurnheer R. (2007). Pneumothorax after Transbronchial Biopsy

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fiberoptic bronchoscope. Pediatr Clin North Am 1984; 31: 785–799.

severity. Am Rev Respir Dis 1992; 146: 116–21.

transplant recipients. Respir Care Clin 2004;10: 549–562

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300–308

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bronchoalveolar lavage and bronchial biopsies in patients with asthma of variable

Bobbaers H. (2000). Thrombocytopenia and prognosis in intensive care. Crit Care

Pulmonary Tuberculosis in Immunocompetent Individuals. J Bronchol 2003;10:

and open biopsies in chronic infiltrative lung diseases. Am Rev Respir Dis 1981;

(1980). Comparison of standard and large forceps for transbronchial lung biopsy in

Since the advent of flexible fiberoptic bronchoscopy (FFB) in the 1970's, the use of sedation and topical anesthesia has allowed the practice of bronchoscopy, specifically FFB, to evolve from the operating room to the outpatient setting. Early techniques of general anesthesia and regional blockade of nerves innervating the airway have been largely replaced by improved techniques of patient monitoring, intravenous conscious sedation, and application of topical anesthetics in the airway. Today the bronchoscopist, in addition to basic FFB techniques such as bronchoalveolar lavage and transbronchial biopsy, can also perform complicated procedures such as removal of foreign bodies, ablation of airway tumors, and endobronchial stenting, all in the outpatient bronchoscopy suite. A continued emphasis has been placed on improvements in patient safety due to the complexities of the procedure itself, but also the role of conscious sedation and topical anesthetics to ensure maximal performance by the bronchoscopist to achieve the desired goal of successful biopsy or other interventions while the patient remains comfortable throughout the entire procedure. A full understanding of the patient's medical history, underlying risk factors such as cardiovascular and pulmonary disease, and medication use is required to plan the requirements for the FFB.

#### **1.1 Guidelines for bronchoscopy**

There is some expert consensus guidance published on the use of sedation and topical anesthesia during FFB. The National Institutes of Health published a workshop summary on the investigational use of FFB in patients with asthma in 1985 (National Institutes of Health [NIH], 1985). Further recommendations for investigational FFB in asthmatics was provided in 1991 and commented on potential hazards, high risk and unsuitable patients, and

<sup>\*</sup>The opinions or assertions contained herein are the private views of the authors and are not to be construed as reflecting the Department of the Army, Department of the Air Force, or the Department of Defense.

No outside funding from any source was received during conduct of this research or preparation of this manuscript. Dr. Morris is a paid speaker for Spiriva by Boehringer-Ingelheim/Pfizer. The other authors have no financial conflicts to disclose.

Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy 37

unstable cardiac arrhythmias, and 7) significant debilitation or malnutrition. The 2001 BTS guidelines do not present any specified contraindications but noted there are no controlled studies of the patient risk factors and each patient must be individually assessed based on

The goal of patient assessment for any invasive procedure such as FFB is to forewarn of potential complications or to identify complications that occur as a result of the procedure. Possible bronchoscopic complications may include a variety of respiratory, cardiac, and other conditions (Pereira et al., 1978, Suratt et al., 1976). Reported respiratory complications include hypoxia, hypercapnea, laryngospasm, bronchospasm, pulmonary edema, aspiration, airway obstruction, pneumomediastinum and pneumothorax (Facciolongo et al., 2009). Cardiac complications can include vasovagal reactions, tachycardia, bradycardia, dysrhythmias, and myocardial infarction. Other reported complications are airway trauma, hemorrhage, epistaxis, infection, nausea and vomiting, adverse reactions to topical anesthesia, exposure to radiation, and death. In an attempt to avoid these possible events, preparation of the patient begins with the initial assessment and evaluation, and monitoring

All patients with an indication for FFB should undergo a historical assessment to identify potential bleeding, respiratory, medication, neurologic, or cardiovascular risks. These could potentially include blood dyscrasias, uremia, anti-coagulant or anti-platelet medications, surgical or dental history, a history of asthma, cervical spine disease, interstitial pneumonia, upper airway obstructions, congenital defects, cardiac history, epilepsy, neoplastic mass or therapies. A previous history of bronchoscopy complications, adverse reactions to sedation, drug or alcohol abuse history may also prove useful (American Society of Anesthesiologists [ASA], 2002). Additionally, a family history for clotting complications or bleeding disorders may suggest when a patient is at higher risk for complication. The airway exam should include an assessment of potential bronchoscope entry points in either nares or mouth for potential risks such as small lumens, excessive deviation, congenital deformities or loose dentition. As some patients require intubation due to procedural complications a Mallampati score, exam of habitus, neck, jaw, and oral structures as they affect direct laryngoscopic intubation are also recommended. Pulmonary exams should include an assessment for tachypnea, increased effort or asymmetry, "barrel-chest", auscultation, cyanosis or clubbing. As bleeding and cardiovascular events have also been reported to complicate bronchoscopy a focused exam to identify potential risk factors in these systems should also be performed. Finally, an American Society of Anesthesiologist's Physical Status

All patients undergoing FFB with sedation should undergo a thorough evaluation to include medical and surgical history, current medications, drug allergies, and amount and type of alcohol and illicit drug use. Medical and surgical history should focus on evaluating the patient's degree of cardiac and respiratory compromise and reserve physiology. Close attention and consideration should be given to those with obstructive lung disease, obstructive sleep apnea, neuromuscular disorders, renal and hepatic impairments. Physical exam should

the risk-benefit ratio (BTS, 2001).

**2. Preparation for bronchoscopy** 

continues through all phases of FFB.

Classification should also be recorded (ASA, 2002).

**2.1 Patient evaluation** 

procedural limitations (NIH, 1991). The American Thoracic Society (ATS) published a concise one-page guideline in 1987 which outlined diagnostic and therapeutic uses, research applications, conditions with increased risk, and contraindications for FFB (American Thoracic Society [ATS], 1987). It did not, however, provide any specific guidance on the optimal use of topical anesthesia or intravenous sedation. In 2001, the British Thoracic Society published a more complete guideline and made several major recommendations related to sedation and topical anesthesia for all patients undergoing FFB (British Thoracic Society [BTS], 2001). All of the following recommendations had level B evidence (except for #8 with level C) to support their use.


A survey of BTS pulmonologists was conducted after the publication of these guidelines (Pickles et al., 2003). A variety of lidocaine (or lignocaine) preparations to include gel, spray, and nebulized were used in 97% of patients with rare use of other anesthetics such as cocaine or amethocaine lozenges. Interestingly, sedation was most commonly done with midazolam but was not used by 27% of respondents citing age, frailty, and medical comorbidities. Assessment of sedation during FFB was most frequently done by measurements of oxygen saturations (98%) and observation of patient response (57%). Similar findings on the lack of standardization were noted in a separate survey of BTS pulmonologists (Smyth et al., 2002).

#### **1.2 Contraindications**

The American Thoracic Society (ATS) 1987 guidelines presented four absolute contraindications to the performance of FFB that included: 1) operator inexperience, 2) lack of adequate facilities, 3) absence of informed consent, and 4) inability to maintain adequate oxygenation. Other significant contraindications thought to confer a high risk to patients during FFB included: 1) profound refractory hypoxemia; 2) severe bleeding diathesis uncorrectable prior to the procedure, and 3) malignant cardiac arrhythmias (ATS, 1987). Other medical conditions that also increased the risk of FFB and were listed as relative contraindications included: 1) lack of patient cooperation, 2) recent myocardial infarction or unstable angina, 3) respiratory insufficiency or failure, 4) uremia, 5) unstable asthma, 6) unstable cardiac arrhythmias, and 7) significant debilitation or malnutrition. The 2001 BTS guidelines do not present any specified contraindications but noted there are no controlled studies of the patient risk factors and each patient must be individually assessed based on the risk-benefit ratio (BTS, 2001).

#### **2. Preparation for bronchoscopy**

36 Global Perspectives on Bronchoscopy

procedural limitations (NIH, 1991). The American Thoracic Society (ATS) published a concise one-page guideline in 1987 which outlined diagnostic and therapeutic uses, research applications, conditions with increased risk, and contraindications for FFB (American Thoracic Society [ATS], 1987). It did not, however, provide any specific guidance on the optimal use of topical anesthesia or intravenous sedation. In 2001, the British Thoracic Society published a more complete guideline and made several major recommendations related to sedation and topical anesthesia for all patients undergoing FFB (British Thoracic Society [BTS], 2001). All of the following recommendations had level B evidence (except for

4. Oxygen supplementation should be used to achieve an oxygen saturation of at least 90% to reduce the risk of significant arrhythmias during the procedure and also in the

5. The total dose of lidocaine should be limited to 8.2 mg/kg in adults (approximately 29 ml of a 2% solution for a 70 kg patient) with extra care in the elderly or those with liver

6. The minimum amount of lidocaine necessary should be used when instilled through

7. Sedatives should be used in incremental doses to achieve adequate sedation and

8. Routine ECG monitoring during bronchoscopy is not required but should be considered in those patients with a history of severe cardiac disease and those who

A survey of BTS pulmonologists was conducted after the publication of these guidelines (Pickles et al., 2003). A variety of lidocaine (or lignocaine) preparations to include gel, spray, and nebulized were used in 97% of patients with rare use of other anesthetics such as cocaine or amethocaine lozenges. Interestingly, sedation was most commonly done with midazolam but was not used by 27% of respondents citing age, frailty, and medical comorbidities. Assessment of sedation during FFB was most frequently done by measurements of oxygen saturations (98%) and observation of patient response (57%). Similar findings on the lack of standardization were noted in a separate survey of BTS

The American Thoracic Society (ATS) 1987 guidelines presented four absolute contraindications to the performance of FFB that included: 1) operator inexperience, 2) lack of adequate facilities, 3) absence of informed consent, and 4) inability to maintain adequate oxygenation. Other significant contraindications thought to confer a high risk to patients during FFB included: 1) profound refractory hypoxemia; 2) severe bleeding diathesis uncorrectable prior to the procedure, and 3) malignant cardiac arrhythmias (ATS, 1987). Other medical conditions that also increased the risk of FFB and were listed as relative contraindications included: 1) lack of patient cooperation, 2) recent myocardial infarction or unstable angina, 3) respiratory insufficiency or failure, 4) uremia, 5) unstable asthma, 6)

1. Sedation should be offered to patients where there is no contraindication.

2. Atropine is not required routinely before bronchoscopy. 3. Patients should be monitored by pulse oximetry.

have hypoxia despite oxygen supplementation.

#8 with level C) to support their use.

postoperative recovery period.

or cardiac impairment.

pulmonologists (Smyth et al., 2002).

**1.2 Contraindications** 

the bronchoscope.

amnesia.

The goal of patient assessment for any invasive procedure such as FFB is to forewarn of potential complications or to identify complications that occur as a result of the procedure. Possible bronchoscopic complications may include a variety of respiratory, cardiac, and other conditions (Pereira et al., 1978, Suratt et al., 1976). Reported respiratory complications include hypoxia, hypercapnea, laryngospasm, bronchospasm, pulmonary edema, aspiration, airway obstruction, pneumomediastinum and pneumothorax (Facciolongo et al., 2009). Cardiac complications can include vasovagal reactions, tachycardia, bradycardia, dysrhythmias, and myocardial infarction. Other reported complications are airway trauma, hemorrhage, epistaxis, infection, nausea and vomiting, adverse reactions to topical anesthesia, exposure to radiation, and death. In an attempt to avoid these possible events, preparation of the patient begins with the initial assessment and evaluation, and monitoring continues through all phases of FFB.

#### **2.1 Patient evaluation**

All patients with an indication for FFB should undergo a historical assessment to identify potential bleeding, respiratory, medication, neurologic, or cardiovascular risks. These could potentially include blood dyscrasias, uremia, anti-coagulant or anti-platelet medications, surgical or dental history, a history of asthma, cervical spine disease, interstitial pneumonia, upper airway obstructions, congenital defects, cardiac history, epilepsy, neoplastic mass or therapies. A previous history of bronchoscopy complications, adverse reactions to sedation, drug or alcohol abuse history may also prove useful (American Society of Anesthesiologists [ASA], 2002). Additionally, a family history for clotting complications or bleeding disorders may suggest when a patient is at higher risk for complication. The airway exam should include an assessment of potential bronchoscope entry points in either nares or mouth for potential risks such as small lumens, excessive deviation, congenital deformities or loose dentition. As some patients require intubation due to procedural complications a Mallampati score, exam of habitus, neck, jaw, and oral structures as they affect direct laryngoscopic intubation are also recommended. Pulmonary exams should include an assessment for tachypnea, increased effort or asymmetry, "barrel-chest", auscultation, cyanosis or clubbing. As bleeding and cardiovascular events have also been reported to complicate bronchoscopy a focused exam to identify potential risk factors in these systems should also be performed. Finally, an American Society of Anesthesiologist's Physical Status Classification should also be recorded (ASA, 2002).

All patients undergoing FFB with sedation should undergo a thorough evaluation to include medical and surgical history, current medications, drug allergies, and amount and type of alcohol and illicit drug use. Medical and surgical history should focus on evaluating the patient's degree of cardiac and respiratory compromise and reserve physiology. Close attention and consideration should be given to those with obstructive lung disease, obstructive sleep apnea, neuromuscular disorders, renal and hepatic impairments. Physical exam should

Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy 39

Anti-platelet agents and non-steroidal anti-inflammatory (NSAID) medications are commonly used by patients who have an indication for FFB. While there is a potential for bleeding complications from biopsy, there are few reported cases of complications related to NSAID medication use. Aspirin is not reported to increase the rate of bleeding bronchoscopic complications when compared to controls (Herth et al., 2002). However, the continued use of clopidogrel prior to bronchoscopy has been associated with a bleeding rate of 89% and up to 100% of patients who continued to take both aspirin and clopidogrel together (Ernst et al., 2006). In patients who can tolerate the cessation of antiplatelet therapy, the 2008 American College of Chest Physicians (ACCP) clinical practice guidelines recommend stopping clopidogrel seven to ten days before FFB while Ernst, et al. recommended stopping five to seven days before FFB.(Douketis et al., 2008; Ernst et al., 2006) While the ACCP additionally recommends that NSAID medications be stopped five half-lives prior to a planned procedure with bleeding risk, there is no specific data on FFB to support this statement. Direct thrombin inhibitors and vitamin K antagonists such as warfarin are also commonly used by patients who require bronchoscopy. The 2008 ACCP Clinical Practice guidelines recommend cessation of warfarin for at least five days prior to a procedure with an INR assessment 1-2 days before the procedure for an INR < 1.5. Certain patients, i.e. those with mechanical valves, may also require bridging on other

Immediately prior to FFB, the patient should be re-evaluated for recent medical events or other changes in condition such as infection or flare of respiratory disease (ASA, 2002; BTS, 2001). Patients who have experienced a recent myocardial infarction are recommended to have the procedure delayed for up to 6 weeks (BTS, 2001). The patient history of oral intake should be confirmed. In healthy patients without modifiers such as delayed gastric emptying, the ASA Pre-Procedure Fasting Guidelines recommend fasting for two hours for clear liquids, four hours for breast milk, and six hours for formula or light meals to decrease the risk of aspiration (ASA, 2002) The BTS guidelines for FFB lower the time limit for light meals to four hours (BTS, 2001). In all patients, intravenous access should be obtained and maintained throughout the procedure. Routine vital signs to confirm systemic and hemodynamic stability are recommended. If the patient has a high risk for cardiovascular disease, consideration should be given to obtain a 12-lead electrocardiogram (Shrader &

For patients who will receive a moderate level of sedation (able to maintain spontaneous ventilation and respond to verbal or tactile stimuli), continuous hemodynamic monitoring should be used at five minute intervals (ASA, 2002). While it is uncertain that all patients undergoing FFB would benefit from intra-procedural continuous electrocardiographic monitoring, both societies recommend continued monitoring in patients who are at high cardiovascular risk. (ASA, 2002; BTS, 2001) A study of continuous electrocardiographic

**2.5 Anti-platelet medications and anticoagulants** 

anticoagulants (Douketis et al., 2008).

**3.1 Pre-procedure assessment** 

Lakshminarayan, 1978).

**3.2 Intraprocedural monitoring** 

**3. Monitoring during bronchoscopy** 

focus on upper airway abnormalities, assessment of potential difficult airway anatomy, pulmonary system focusing on active airway obstruction, and gross neurologic function.

#### **2.2 Pulmonary function testing**

Pulmonary function testing should be performed if there is clinical suspicion for severe obstruction. The BTS guideline suggests testing be performed when forced expiratory volume at one second (FEV1) is less than 40% predicted or oxygen saturation (SaO2) is less than 93% (BTS, 2001). One small prospective trial reported a drop of 13.8% in FEV1 (baseline 1.37 ± 0.16L) approximately 15 minutes into bronchoscopy (Salisbury et al., 1975). A slightly larger retrospective review reported patients who had a FEV1/forced expiratory volume (FVC) ratio less than 50% or an FEV1 less than one liter with an FEV1/FVC ratio less than 69% had a bronchoscopic complication rate of 5% compared to 0.6% of controls with normal spirometric function (Peacock et al., 1994). If the patient requires additional procedures such as bronchoalveolar lavage or transbronchial biopsy and there are concerns for possible respiratory compromise, screening spirometry may also be useful. Lima reported that patients with diffuse lung disease have a decrease of approximately 12.7% in FEV1 following bronchoalveolar lavage (Lima et al., 2009).

#### **2.3 Radiographic studies**

It is assumed that a patient who is scheduled to undergo FFB has already had a chest radiograph performed given the minimal risk and ability to non-invasively assess the thorax. However, if a computed tomography (CT) scan of the chest has not already been performed, it should be considered for patients with hemoptysis or undergoing a neoplastic evaluation. A higher diagnostic sampling yield for malignancy has been reported if the patient had a CT performed prior to bronchoscopy (Bungay et al., 2000; Laroche et al., 2000). Additionally, in cases of hemoptysis, pre-procedural CT was able to improve sampling in patients who were at higher risk for neoplastic associated hemoptysis, obviate the need for invasive evaluation, or help identify areas of bronchiectasis for sampling (McGuinness et al., 1994; Tsoumakidou et al., 2006).

#### **2.4 Laboratory testing**

A large number of practitioners empirically order coagulation tests prior to performing FFB. The ability of these tests to predict bleeding risks prior to FFB is controversial and several sources recommend against routine testing (Bjørtuft et al., 1998; Kozak & Brath, 1994; Segal et al., 2005). Additionally, Weiss reported bleeding risks in a group of thrombocytopenic patients with platelet counts less than 100,000 who underwent a total of 58 FFB procedures. There were seven occurrences of epistaxis and/or hemorrhage but only one patient experienced severe epistaxis despite an oral approach and a platelet count of 18,000 (Weiss et al., 1993). Thus, routine testing without significant suspicion for bleeding risk is not recommended. A pre-procedural arterial blood gas is recommended in the 2001 BTS guidelines for the same patients who may benefit from a pre-procedural PFT, FEV1 less than 40% predicted or SaO2 <93% (BTS, 2001). There is scant available data to support this recommendation except for the report by Salisbury in which one patient whose PaO2 plummeted from 60 mm Hg to 38 mm Hg intra-procedurally and resolved with removal of the bronchoscope (Salisbury et al., 1975).

#### **2.5 Anti-platelet medications and anticoagulants**

38 Global Perspectives on Bronchoscopy

focus on upper airway abnormalities, assessment of potential difficult airway anatomy, pulmonary system focusing on active airway obstruction, and gross neurologic function.

Pulmonary function testing should be performed if there is clinical suspicion for severe obstruction. The BTS guideline suggests testing be performed when forced expiratory volume at one second (FEV1) is less than 40% predicted or oxygen saturation (SaO2) is less than 93% (BTS, 2001). One small prospective trial reported a drop of 13.8% in FEV1 (baseline 1.37 ± 0.16L) approximately 15 minutes into bronchoscopy (Salisbury et al., 1975). A slightly larger retrospective review reported patients who had a FEV1/forced expiratory volume (FVC) ratio less than 50% or an FEV1 less than one liter with an FEV1/FVC ratio less than 69% had a bronchoscopic complication rate of 5% compared to 0.6% of controls with normal spirometric function (Peacock et al., 1994). If the patient requires additional procedures such as bronchoalveolar lavage or transbronchial biopsy and there are concerns for possible respiratory compromise, screening spirometry may also be useful. Lima reported that patients with diffuse lung disease have a decrease of approximately 12.7% in FEV1 following

It is assumed that a patient who is scheduled to undergo FFB has already had a chest radiograph performed given the minimal risk and ability to non-invasively assess the thorax. However, if a computed tomography (CT) scan of the chest has not already been performed, it should be considered for patients with hemoptysis or undergoing a neoplastic evaluation. A higher diagnostic sampling yield for malignancy has been reported if the patient had a CT performed prior to bronchoscopy (Bungay et al., 2000; Laroche et al., 2000). Additionally, in cases of hemoptysis, pre-procedural CT was able to improve sampling in patients who were at higher risk for neoplastic associated hemoptysis, obviate the need for invasive evaluation, or help identify areas of bronchiectasis for sampling (McGuinness et al.,

A large number of practitioners empirically order coagulation tests prior to performing FFB. The ability of these tests to predict bleeding risks prior to FFB is controversial and several sources recommend against routine testing (Bjørtuft et al., 1998; Kozak & Brath, 1994; Segal et al., 2005). Additionally, Weiss reported bleeding risks in a group of thrombocytopenic patients with platelet counts less than 100,000 who underwent a total of 58 FFB procedures. There were seven occurrences of epistaxis and/or hemorrhage but only one patient experienced severe epistaxis despite an oral approach and a platelet count of 18,000 (Weiss et al., 1993). Thus, routine testing without significant suspicion for bleeding risk is not recommended. A pre-procedural arterial blood gas is recommended in the 2001 BTS guidelines for the same patients who may benefit from a pre-procedural PFT, FEV1 less than 40% predicted or SaO2 <93% (BTS, 2001). There is scant available data to support this recommendation except for the report by Salisbury in which one patient whose PaO2 plummeted from 60 mm Hg to 38 mm Hg intra-procedurally and resolved with removal of

**2.2 Pulmonary function testing** 

bronchoalveolar lavage (Lima et al., 2009).

**2.3 Radiographic studies** 

1994; Tsoumakidou et al., 2006).

the bronchoscope (Salisbury et al., 1975).

**2.4 Laboratory testing** 

Anti-platelet agents and non-steroidal anti-inflammatory (NSAID) medications are commonly used by patients who have an indication for FFB. While there is a potential for bleeding complications from biopsy, there are few reported cases of complications related to NSAID medication use. Aspirin is not reported to increase the rate of bleeding bronchoscopic complications when compared to controls (Herth et al., 2002). However, the continued use of clopidogrel prior to bronchoscopy has been associated with a bleeding rate of 89% and up to 100% of patients who continued to take both aspirin and clopidogrel together (Ernst et al., 2006). In patients who can tolerate the cessation of antiplatelet therapy, the 2008 American College of Chest Physicians (ACCP) clinical practice guidelines recommend stopping clopidogrel seven to ten days before FFB while Ernst, et al. recommended stopping five to seven days before FFB.(Douketis et al., 2008; Ernst et al., 2006) While the ACCP additionally recommends that NSAID medications be stopped five half-lives prior to a planned procedure with bleeding risk, there is no specific data on FFB to support this statement. Direct thrombin inhibitors and vitamin K antagonists such as warfarin are also commonly used by patients who require bronchoscopy. The 2008 ACCP Clinical Practice guidelines recommend cessation of warfarin for at least five days prior to a procedure with an INR assessment 1-2 days before the procedure for an INR < 1.5. Certain patients, i.e. those with mechanical valves, may also require bridging on other anticoagulants (Douketis et al., 2008).

#### **3. Monitoring during bronchoscopy**

#### **3.1 Pre-procedure assessment**

Immediately prior to FFB, the patient should be re-evaluated for recent medical events or other changes in condition such as infection or flare of respiratory disease (ASA, 2002; BTS, 2001). Patients who have experienced a recent myocardial infarction are recommended to have the procedure delayed for up to 6 weeks (BTS, 2001). The patient history of oral intake should be confirmed. In healthy patients without modifiers such as delayed gastric emptying, the ASA Pre-Procedure Fasting Guidelines recommend fasting for two hours for clear liquids, four hours for breast milk, and six hours for formula or light meals to decrease the risk of aspiration (ASA, 2002) The BTS guidelines for FFB lower the time limit for light meals to four hours (BTS, 2001). In all patients, intravenous access should be obtained and maintained throughout the procedure. Routine vital signs to confirm systemic and hemodynamic stability are recommended. If the patient has a high risk for cardiovascular disease, consideration should be given to obtain a 12-lead electrocardiogram (Shrader & Lakshminarayan, 1978).

#### **3.2 Intraprocedural monitoring**

For patients who will receive a moderate level of sedation (able to maintain spontaneous ventilation and respond to verbal or tactile stimuli), continuous hemodynamic monitoring should be used at five minute intervals (ASA, 2002). While it is uncertain that all patients undergoing FFB would benefit from intra-procedural continuous electrocardiographic monitoring, both societies recommend continued monitoring in patients who are at high cardiovascular risk. (ASA, 2002; BTS, 2001) A study of continuous electrocardiographic

Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy 41

(Putinati et al., 1999). Interestingly, Hatton et al. described decreased patient satisfaction and willingness to undergo repeat procedure when comparing midazolam to placebo (Hatton et al., 1994). Subsequent editorial comments highlight the difficulty in evaluating these studies as the results were criticized for insufficient medication dosing and administration sequence

Previous reviews reveal wide variation in the practice patterns for sedation use during FFB (Matot & Kramer, 2000; Vincent & Silvestri, 2007). No single regimen has been found to be superior and previous guidelines did not have recommended regimens (BTS, 2001). Recently, the American College of Chest Physicians released a consensus statement on topical anesthesia, analgesia and sedation during FFB. The consensus statement suggested the use of lidocaine for topical anesthesia and the combination of a benzodiazepine and opiate administration for sedation and analgesia during the procedure, with propofol as an effective alternative agent (Wahidi et al., 2011). Multiple factors must be taken into consideration when selecting an analgesic and sedative regimen. Patient characteristics include age, co-morbidities, and baseline respiratory physiology. The procedure complexity and time required must be considered as an airway survey and bronchoalveolar lavage invariably requires less time and sedation than more complex procedures such as transbronchial biopsies, mediastinal lymph node sampling, debulking and stenting of endobronchial lesions. The degree of sedation required can vary greatly from mild sedation to general anesthesia (ASA, 2002). Increasingly complex FFB procedures are being performed without the assistance of general anesthesia including mediastinal lymph node staging with endobronchial ultrasound guidance with good patient satisfaction (Steinfort & Irvin, 2010). Finally one must be familiar with the degree of support staff able to provide pre

The desired degree of sedation and analgesia should be determined for individual patients

1. Minimal Sedation (Anxiolysis): A drug induced state with normal response to verbal stimulation with unaffected airway, spontaneous ventilation and cardiovascular

2. Moderate Sedation/Analgesia (Conscious Sedation): A drug induced state with purposeful response to verbal or tactile stimulation, no airway interventions required, maintains adequate spontaneous ventilation, and cardiovascular function typically

3. Deep Sedation/Analgesia: A drug induced state with purposeful response after repeated or painful stimuli, airway intervention may be required, spontaneous ventilation may be inadequate and cardiovascular function typically maintained. 4. General Anesthesia: A drug induced state in which patients are not arousable even with painful stimulus, airway intervention required, spontaneous ventilation frequently

The level of sedation required for FFB is typically minimal to moderate depending upon the type of procedure planned and is often performed by a non-anesthesiologist. When greater than moderate sedation is desired, those patients with limited cardiovascular or pulmonary

and post-procedural care and monitoring during the recovery process.

and follow American Society of Anesthesiologists (ASA) definitions:

inadequate, and cardiovascular function may be impaired.

(Hanley, 1995).

**4.1 Degree of sedation** 

function

maintained.

monitoring demonstrated evidence of myocardial ischemia in 17% of 29 patients above the age of 50 undergoing FFB (Matot et al., 1997).

#### **3.3 Supplemental oxygen**

The routine use of supplemental oxygen during FFB has previously been a point of disagreement with some authors. Given the known risks for cardiac arrhythmia during periods of hypoxia, both supplemental oxygen administration and monitoring with pulse oximetry are recommended for all patients. The sensitivity of pulse oximetry to detect hypoxia compared to clinical exam should make this a routine part of FFB even in healthy or research patients, especially with the use of conscious sedation (ASA, 2002; BTS, 2001; Shrader & Lakshminarayan, 1978). Ghio et al. demonstrated evidence of hypoxia in healthy volunteers during the initiation of bronchoalveolar lavage (Ghio et al., 2007). Nearly 25% of patients in a study of 1,051 FFB required the use of supplemental oxygen for desaturations (Jones & O'Driscoll, 2000). The BTS recommends using supplemental oxygen to maintain a goal of SaO2 greater than 89% during and after FFB (BTS, 2001). Patients who undergo FFB are frequently at increased risk for hypercapnea due to intravenous sedation or underlying lung disease (Salisbury et al., 1975). While capnography is also more sensitive to hypercapnea than physical exam, there is no clear recommendation or evidence to support the routine use of capnography during FFB with moderate levels of sedation.

#### **3.4 Post-procedure assessment**

After FFB is completed, patients should continue to receive oximetry and be monitored until they are near their baseline state of consciousness and interaction (ASA, 2002). Supplemental oxygen should also be continued until the patient can spontaneously maintain a SaO2 greater than 89%. The return of the gag reflex and the ability to safely swallow clear liquids should be confirmed (BTS, 2001). If the patient has received transbronchial biopsies with or without fluoroscopic guidance, a chest radiograph should be performed one hour following the procedure (BTS, 2001). Transthoracic ultrasound has recently come to prominence for the ability to identify the presence of pneumothorax, but its routine use following FFB is not yet well established.

#### **4. Sedation**

Persons undergoing FFB can experience significant degree of anxiety, sense of asphyxiation, and severe coughing. Sedative and analgesic agents are frequently administered to patients undergoing bronchoscopy to reduce these noxious sensations. Both the ATS and the BTS guidelines recommend the use of sedation during bronchoscopy (ATS, 1987; BTS, 2001). Despite this, debate has continued regarding the necessity of sedation during FFB. Surveys have revealed increased physician comfort and use of sedation during bronchoscopy (McLean et al., 1998; Prakash et al., 1991). Patient satisfaction and willingness to pursue repeat FFB procedures if required has been shown to be higher in those receiving sedative and systemic analgesic agents (Gonzales et al., 2003; Hirose et al., 2008; Putinati et al., 1999; Steinfort & Irvin, 2010). Tolerance to FFB was clearly decreased in a prospective study of 357 patients who received no sedation for their procedure (Lopez et al., 2006). Putinati et al. also demonstrated improved procedural success in those receiving sedative agents. Bronchoscopy was aborted prior to completion in six of fifty patients in the placebo group (Putinati et al., 1999). Interestingly, Hatton et al. described decreased patient satisfaction and willingness to undergo repeat procedure when comparing midazolam to placebo (Hatton et al., 1994). Subsequent editorial comments highlight the difficulty in evaluating these studies as the results were criticized for insufficient medication dosing and administration sequence (Hanley, 1995).

Previous reviews reveal wide variation in the practice patterns for sedation use during FFB (Matot & Kramer, 2000; Vincent & Silvestri, 2007). No single regimen has been found to be superior and previous guidelines did not have recommended regimens (BTS, 2001). Recently, the American College of Chest Physicians released a consensus statement on topical anesthesia, analgesia and sedation during FFB. The consensus statement suggested the use of lidocaine for topical anesthesia and the combination of a benzodiazepine and opiate administration for sedation and analgesia during the procedure, with propofol as an effective alternative agent (Wahidi et al., 2011). Multiple factors must be taken into consideration when selecting an analgesic and sedative regimen. Patient characteristics include age, co-morbidities, and baseline respiratory physiology. The procedure complexity and time required must be considered as an airway survey and bronchoalveolar lavage invariably requires less time and sedation than more complex procedures such as transbronchial biopsies, mediastinal lymph node sampling, debulking and stenting of endobronchial lesions. The degree of sedation required can vary greatly from mild sedation to general anesthesia (ASA, 2002). Increasingly complex FFB procedures are being performed without the assistance of general anesthesia including mediastinal lymph node staging with endobronchial ultrasound guidance with good patient satisfaction (Steinfort & Irvin, 2010). Finally one must be familiar with the degree of support staff able to provide pre and post-procedural care and monitoring during the recovery process.

#### **4.1 Degree of sedation**

40 Global Perspectives on Bronchoscopy

monitoring demonstrated evidence of myocardial ischemia in 17% of 29 patients above the

The routine use of supplemental oxygen during FFB has previously been a point of disagreement with some authors. Given the known risks for cardiac arrhythmia during periods of hypoxia, both supplemental oxygen administration and monitoring with pulse oximetry are recommended for all patients. The sensitivity of pulse oximetry to detect hypoxia compared to clinical exam should make this a routine part of FFB even in healthy or research patients, especially with the use of conscious sedation (ASA, 2002; BTS, 2001; Shrader & Lakshminarayan, 1978). Ghio et al. demonstrated evidence of hypoxia in healthy volunteers during the initiation of bronchoalveolar lavage (Ghio et al., 2007). Nearly 25% of patients in a study of 1,051 FFB required the use of supplemental oxygen for desaturations (Jones & O'Driscoll, 2000). The BTS recommends using supplemental oxygen to maintain a goal of SaO2 greater than 89% during and after FFB (BTS, 2001). Patients who undergo FFB are frequently at increased risk for hypercapnea due to intravenous sedation or underlying lung disease (Salisbury et al., 1975). While capnography is also more sensitive to hypercapnea than physical exam, there is no clear recommendation or evidence to support

the routine use of capnography during FFB with moderate levels of sedation.

After FFB is completed, patients should continue to receive oximetry and be monitored until they are near their baseline state of consciousness and interaction (ASA, 2002). Supplemental oxygen should also be continued until the patient can spontaneously maintain a SaO2 greater than 89%. The return of the gag reflex and the ability to safely swallow clear liquids should be confirmed (BTS, 2001). If the patient has received transbronchial biopsies with or without fluoroscopic guidance, a chest radiograph should be performed one hour following the procedure (BTS, 2001). Transthoracic ultrasound has recently come to prominence for the ability to identify the presence of pneumothorax, but its

Persons undergoing FFB can experience significant degree of anxiety, sense of asphyxiation, and severe coughing. Sedative and analgesic agents are frequently administered to patients undergoing bronchoscopy to reduce these noxious sensations. Both the ATS and the BTS guidelines recommend the use of sedation during bronchoscopy (ATS, 1987; BTS, 2001). Despite this, debate has continued regarding the necessity of sedation during FFB. Surveys have revealed increased physician comfort and use of sedation during bronchoscopy (McLean et al., 1998; Prakash et al., 1991). Patient satisfaction and willingness to pursue repeat FFB procedures if required has been shown to be higher in those receiving sedative and systemic analgesic agents (Gonzales et al., 2003; Hirose et al., 2008; Putinati et al., 1999; Steinfort & Irvin, 2010). Tolerance to FFB was clearly decreased in a prospective study of 357 patients who received no sedation for their procedure (Lopez et al., 2006). Putinati et al. also demonstrated improved procedural success in those receiving sedative agents. Bronchoscopy was aborted prior to completion in six of fifty patients in the placebo group

age of 50 undergoing FFB (Matot et al., 1997).

**3.3 Supplemental oxygen** 

**3.4 Post-procedure assessment**

**4. Sedation** 

routine use following FFB is not yet well established.

The desired degree of sedation and analgesia should be determined for individual patients and follow American Society of Anesthesiologists (ASA) definitions:


The level of sedation required for FFB is typically minimal to moderate depending upon the type of procedure planned and is often performed by a non-anesthesiologist. When greater than moderate sedation is desired, those patients with limited cardiovascular or pulmonary

Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy 43

slightly superior to alfentanil combination (Leite et al., 2008). All opiates can produce respiratory depression and this is amplified when given in combination with another sedative agent (Yoon et al., 2011). If severe respiratory depression occurs, reversal of opiate agents can be obtained with naloxone use. Due to potential adverse hemodynamic effects of naloxone and sudden opiate reversal, this should be reserved for those patients with

Propofol is an alkyl-phenol sedative-hypnotic agent in a lipid emulsion capable of producing a dose-dependent degree of sedation from conscious sedation to general anesthesia. It has a rapid onset of action (less than two minutes) and rapid recovery (less than 15 minutes) (Matot & Kramer, 2000; Vincent & Silvestri, 2007). When compared to alfentanil and midazolam as well as topical lidocaine, propofol had the lowest composite score indicating the lowest complication index (Leite et al., 2008). Propofol has been demonstrated to have improved patient neuropsychometric recovery with no difference in physician procedural sedation satisfaction when compared to midazolam (Clark et al., 2009). Propofol has also been reported to be a safe option for sedation in pediatric patients (Berkenbosch et al., 2004; Larsen et al., 2009). In a retrospective study, it must be noted however that fifty percent of pediatric patients were classified as having minor complications which included the need for supplemental oxygen, oropharyngeal suctioning or jaw-thrust to improve oxygen saturation (Larsen et al., 2009). Propofol in separate combinations with alfentanil and ketamine has been demonstrated to provide patient controlled sedation via a patient-controlled-analgesia device (Hwang et al., 2005). Fospropofol, a water-soluble prodrug of propofol, has been demonstrated to be a safe agent during FFB in a phase three trial (Silvestri et al., 2009). Mild to moderate hypoxia was noted in 15% of the patients given the described optimal sedative dose. One must be aware of and recognize the typically dose dependent hemodynamic effects (hypotension, decreased

cardiac output) as well as the rare development of propofol infusion syndrome.

the ability for the bronchoscopist to complete the procedure is likewise paramount.

There is significant variation in the administration of topical anesthesia during FFB. The optimal preparation largely depends on the patient, the experience of the technician, and the estimated length of the procedure. A typical airway preparation for FFB in our institution

Along with sedation, topical airway anesthesia is an important component of FFB as it provides the patient additional comfort and tolerability that sedation alone will not provide. Local anesthesia of the nares, oropharynx, and hypopharynx allows comfortable passage of the bronchoscope to the upper airway. More importantly, topical anesthesia of the airways beyond the glottis blunts the cough reflex and allows the bronchoscopist to visualize the airways and perform necessary procedures. Selected patients such as healthy volunteers with adequate topical anesthesia can tolerate FFB without the need for intravenous sedation (Ghio et al., 1998). There have been a variety of studies that have explored issues of patient comfort, tolerability of FFB and dosing regimens. While patient comfort is the primary goal,

clinically significant respiratory depression.

**4.2.3 Propofol** 

**5. Topical anesthesia** 

**5.1 Administration** 

reserve, or prolonged procedure anticipated, it is recommended the expertise of an anesthesiologist be obtained.

#### **4.2 Sedative and analgesic agents**

Favorable agent profiles include relatively rapid onset of action, rapid and predictable recovery, with minimal hemodynamic instability and lack of significant respiratory depression at doses achieving desired level of sedation. For these reasons benzodiazepines, opioids, and more recently propofol have been increasingly used for sedation during FFB (Vincent & Silvestri, 2007). Other intravenous agents to improve patient comfort such as atropine are not currently recommended and limited studies have failed to demonstrate a significant benefit (Hasanoglu et al., 2001; Korteweg et al., 2004; Triller et al., 2004)

#### **4.2.1 Benzodiazepines**

Benzodiazepines have sedative-hypnotic, anxiolytic, and amnestic effects by interacting on GABA receptors. Frequently used agents include diazepam, midazolam, lorazepam, and temazepam (Greig et al., 1995; Leite et al., 2008; Vincent & Silvestri, 2007; Watts et al., 2005). Oral use of temazepam and diazepam has been described and appear to offer an appropriate degree of mild sedation/anxiolysis (Matot & Kramer, 2000; Watts et al., 2005). The advent of midazolam, a water soluble, short-acting benzodiazepine able to be given intravenously has made it the primary agent in many bronchoscopy suites. The metabolites of midazolam have minimal subsequent effects. Midazolam can be given via intermittent intravenous doses and tailored to patient responses. Caution should be used when administrating to the elderly and those with obstructive airway physiology. Sedation is typically effective for 20-40 minutes. Midazolam can be safely given in 0.5mg to 1mg increments at five minute intervals until desired level of sedation achieved. Another desirable attribute to benzodiazepines is the availability of a reversal agent. The competitive antagonist, flumazenil can rapidly reverse the effects of benzodiazepines. Though not standard practice, a study of 22 patients demonstrated successful reversal FB sedation using flumazenil (Williamson et al., 1997). Flumazenil use is typically reserved for benzodiazepine reversal in those patients experiencing sedation related hypoxia, need for improved airway clearance, or increasing hypercarbia. Flumazenil use should be avoided in those patients on chronic benzodiazepines due to possible seizure provocation.

#### **4.2.2 Opiates**

Opiates have both sedative and analgesic properties as well as antitussive effects. Frequently used opiate agents include fentanyl, alfentanil, remifentanil, meperidine and less frequently morphine. Many studies have evaluated opiate agents in combination with other sedatives including benzodiazepines and propofol (Greig et al., 1995; Hwang et al., 2005; Leite et al., 2008; Matot & Kramer, 2000; Vincent & Silvestri, 2007; Yoon et al., 2011). Greig et al. demonstrated that a lone opiate agent in combination with a benzodiazepine resulted in a reduced number of coughs and reduced topical lidocaine dose (Greig et al., 1995). Fentanyl and related agents are desired due to rapid onset of action, high potency, and short duration of action. A study of alfentanil with standard dose topical lidocaine revealed improved composite score of sedative effects and adverse events when compared to lidocaine alone or midazolam combined with topical lidocaine. The propofol combination composite score was slightly superior to alfentanil combination (Leite et al., 2008). All opiates can produce respiratory depression and this is amplified when given in combination with another sedative agent (Yoon et al., 2011). If severe respiratory depression occurs, reversal of opiate agents can be obtained with naloxone use. Due to potential adverse hemodynamic effects of naloxone and sudden opiate reversal, this should be reserved for those patients with clinically significant respiratory depression.

#### **4.2.3 Propofol**

42 Global Perspectives on Bronchoscopy

reserve, or prolonged procedure anticipated, it is recommended the expertise of an

Favorable agent profiles include relatively rapid onset of action, rapid and predictable recovery, with minimal hemodynamic instability and lack of significant respiratory depression at doses achieving desired level of sedation. For these reasons benzodiazepines, opioids, and more recently propofol have been increasingly used for sedation during FFB (Vincent & Silvestri, 2007). Other intravenous agents to improve patient comfort such as atropine are not currently recommended and limited studies have failed to demonstrate a

Benzodiazepines have sedative-hypnotic, anxiolytic, and amnestic effects by interacting on GABA receptors. Frequently used agents include diazepam, midazolam, lorazepam, and temazepam (Greig et al., 1995; Leite et al., 2008; Vincent & Silvestri, 2007; Watts et al., 2005). Oral use of temazepam and diazepam has been described and appear to offer an appropriate degree of mild sedation/anxiolysis (Matot & Kramer, 2000; Watts et al., 2005). The advent of midazolam, a water soluble, short-acting benzodiazepine able to be given intravenously has made it the primary agent in many bronchoscopy suites. The metabolites of midazolam have minimal subsequent effects. Midazolam can be given via intermittent intravenous doses and tailored to patient responses. Caution should be used when administrating to the elderly and those with obstructive airway physiology. Sedation is typically effective for 20-40 minutes. Midazolam can be safely given in 0.5mg to 1mg increments at five minute intervals until desired level of sedation achieved. Another desirable attribute to benzodiazepines is the availability of a reversal agent. The competitive antagonist, flumazenil can rapidly reverse the effects of benzodiazepines. Though not standard practice, a study of 22 patients demonstrated successful reversal FB sedation using flumazenil (Williamson et al., 1997). Flumazenil use is typically reserved for benzodiazepine reversal in those patients experiencing sedation related hypoxia, need for improved airway clearance, or increasing hypercarbia. Flumazenil use should be avoided in those patients on

Opiates have both sedative and analgesic properties as well as antitussive effects. Frequently used opiate agents include fentanyl, alfentanil, remifentanil, meperidine and less frequently morphine. Many studies have evaluated opiate agents in combination with other sedatives including benzodiazepines and propofol (Greig et al., 1995; Hwang et al., 2005; Leite et al., 2008; Matot & Kramer, 2000; Vincent & Silvestri, 2007; Yoon et al., 2011). Greig et al. demonstrated that a lone opiate agent in combination with a benzodiazepine resulted in a reduced number of coughs and reduced topical lidocaine dose (Greig et al., 1995). Fentanyl and related agents are desired due to rapid onset of action, high potency, and short duration of action. A study of alfentanil with standard dose topical lidocaine revealed improved composite score of sedative effects and adverse events when compared to lidocaine alone or midazolam combined with topical lidocaine. The propofol combination composite score was

significant benefit (Hasanoglu et al., 2001; Korteweg et al., 2004; Triller et al., 2004)

chronic benzodiazepines due to possible seizure provocation.

anesthesiologist be obtained.

**4.2.1 Benzodiazepines** 

**4.2.2 Opiates** 

**4.2 Sedative and analgesic agents** 

Propofol is an alkyl-phenol sedative-hypnotic agent in a lipid emulsion capable of producing a dose-dependent degree of sedation from conscious sedation to general anesthesia. It has a rapid onset of action (less than two minutes) and rapid recovery (less than 15 minutes) (Matot & Kramer, 2000; Vincent & Silvestri, 2007). When compared to alfentanil and midazolam as well as topical lidocaine, propofol had the lowest composite score indicating the lowest complication index (Leite et al., 2008). Propofol has been demonstrated to have improved patient neuropsychometric recovery with no difference in physician procedural sedation satisfaction when compared to midazolam (Clark et al., 2009). Propofol has also been reported to be a safe option for sedation in pediatric patients (Berkenbosch et al., 2004; Larsen et al., 2009). In a retrospective study, it must be noted however that fifty percent of pediatric patients were classified as having minor complications which included the need for supplemental oxygen, oropharyngeal suctioning or jaw-thrust to improve oxygen saturation (Larsen et al., 2009). Propofol in separate combinations with alfentanil and ketamine has been demonstrated to provide patient controlled sedation via a patient-controlled-analgesia device (Hwang et al., 2005). Fospropofol, a water-soluble prodrug of propofol, has been demonstrated to be a safe agent during FFB in a phase three trial (Silvestri et al., 2009). Mild to moderate hypoxia was noted in 15% of the patients given the described optimal sedative dose. One must be aware of and recognize the typically dose dependent hemodynamic effects (hypotension, decreased cardiac output) as well as the rare development of propofol infusion syndrome.

#### **5. Topical anesthesia**

Along with sedation, topical airway anesthesia is an important component of FFB as it provides the patient additional comfort and tolerability that sedation alone will not provide. Local anesthesia of the nares, oropharynx, and hypopharynx allows comfortable passage of the bronchoscope to the upper airway. More importantly, topical anesthesia of the airways beyond the glottis blunts the cough reflex and allows the bronchoscopist to visualize the airways and perform necessary procedures. Selected patients such as healthy volunteers with adequate topical anesthesia can tolerate FFB without the need for intravenous sedation (Ghio et al., 1998). There have been a variety of studies that have explored issues of patient comfort, tolerability of FFB and dosing regimens. While patient comfort is the primary goal, the ability for the bronchoscopist to complete the procedure is likewise paramount.

#### **5.1 Administration**

There is significant variation in the administration of topical anesthesia during FFB. The optimal preparation largely depends on the patient, the experience of the technician, and the estimated length of the procedure. A typical airway preparation for FFB in our institution

Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy 45

lowest topical anesthetic dose possible should be used (NIH, 1991). When the BTS published general guidelines for topical anesthesia in the routine clinical practice of FFB, their recommendation was based primarily on two recently published studies (BTS, 2001). A study of 48 asthmatics undergoing research FFB demonstrated safety with a mean dose of 8.2 mg/kg of lidocaine as the upper limit of normal (Langmack et al., 2000). Another smaller study by Milman et al. of 16 patients undergoing FFB recommended a maximum dosage of

The current medical literature contains a substantial collection of studies evaluating serum lidocaine levels during FFB. These studies evaluating lidocaine dosing have been done to evaluate a variety of techniques in application of topical anesthesia (Ameer et al., 1989; Amitai et al., 1990, Berger et al., 1989; Boye & Bresden, 1979; Efthimiou et al., 1982; Gjonaj et al., 1997; Gomez et al., 1983; Jones et al., 1982; Karvonen et al., 1976; Korttila et al., 1981; Langmack et al., 2000; Le Lorier et al., 1979; Loukides et al., 2000; Mainland et al., 2001; McBurney et al., 1984; Milman et al., 1998; Patterson et al., 1975; Smith et al., 1985; Sucena et al., 2004; Sutherland et al., 1985). These twenty studies were reviewed by Frey et al. in their study of lidocaine dosing (Frey et al., 2008). This compilation of studies included a total of 457 patients whose mean age was 47.4 ± 23.7 years and the mean total dose of lidocaine was 488 ± 463 mg. The mean lidocaine dose (reported as adjusted for weight) was 9.7 ± 5.0 mg/kg. Only six of these studies gave a lidocaine dose greater than 8.2 mg/kg or total dose greater than 600 mg. None of the studies reported an average peak lidocaine level > 5.0 mg/kg, while only three of the 21 studies reported a maximum lidocaine level > 5.0 mg/kg. This cumulative data of nearly 500 patients did not suggest a trend towards lidocaine toxicity despite higher lidocaine levels than the BTS recommendations (Frey et al., 2008) The Frey study collected measured lidocaine dosing and serum levels for 154 patients with a mean age of 64.7 years undergoing FFB. Mean lidocaine usage was 15.4 ± 4.5 mg/kg (1.17±0.20 gm), mean serum lidocaine level was 1.6 ± 0.7 mg/mL, and mean blood methemoglobin level was 0.7 ± 0.3%. No clinical toxicity was noted and the authors adequately demonstrated the safety of higher doses of topical lidocaine (Frey et al., 2008). Other studies have also demonstrated the safety of higher doses of lidocaine during FFB (Ameer et al., 1989; Gjonaj et al., 1997; Sucena et al., 2004]. In the earliest study in 1979, 12 FOB patients received an average of 600 mg of topical lidocaine. The maximum lidocaine level was found to be 3.79 μg/ml in a patient with hepatic metastases who only received 420 mg topical lidocaine (LeLorier et al., 1979). A follow-up study in 1982 by Efthimiou et al. of 41 FOB patients used a similar mean lidocaine dose (9.3 ± 0.5 mg/kg); mean peak levels were 2.9 ± 0.5 μg/ml and two patients had a lidocaine level > 5 μg/ml with no complications (Efthimiou et al., 1982). Ameer et al. compared an elderly group of 14 patients (mean age of 67 years) with a young group of five patients (mean age of 42 years). Both groups received total lidocaine doses of nearly 1200 mg without significant toxicity. No difference in mean or peak serum lidocaine was found between groups (Ameer et al., 1989). As part of a study evaluating the effect of lidocaine on endobronchial cultures, Berger et al. studied eight patients who received an average total lidocaine dose greater than 2000 mg. The mean serum level was 2.7 μg/ml and the peak level in one patient was 5.5 μg/ml; no toxicity was reported (Berger et al., 1989). In 1997, Gjonaj et al. evaluated 8 mg/kg vs. 4 mg/kg of nebulized 2% lidocaine in a pediatric population and found no evidence of toxicity. The total lidocaine dose for the high-dose group was 10.13 ± 1.26 mg/kg with mean serum lidocaine levels of 1.17 ± 0.54 μg/ml and peak levels of 2.27 μg/ml [Gjonaj et al.,

6-7 mg/kg (Milman et al., 1998).

includes the application of 2% viscous lidocaine for the nasal mucosa, nebulized 4% topical lidocaine for oral inhalation prior to the FFB, and application of 1% topical lidocaine during the procedure for additional upper and lower airway mucosal anesthesia to control coughing. This airway preparation uses approximately 500 mg of topical lidocaine. The amount of 1% lidocaine used is highly variable and physician dependent with approximately 100 mg used for direct application to the vocal cords and carina and additional lidocaine used for lower airway anesthesia to suppress coughing. There are relatively few studies examining the optimal lidocaine dosing for patient comfort and safety during FFB. A study examining various lidocaine amounts (mg/kg) and strengths ranging from 1% to 2% in 96 patients found no differences between the six groups in terms of patient comfort (Mainland et al., 2001). The author recommended use of 1% lidocaine for topical airway anesthesia based on similar amounts of supplemental lidocaine doses and serum lidocaine levels. An earlier 1985 study demonstrated there was no effect on patient comfort scores when a fixed dose of 370 mg of lidocaine was compared with higher lidocaine doses with as needed dosing (mean lidocaine dose=512 mg) (Sutherland et al., 1985). Notably, the airway preparation in the fixed dose group used 1% lidocaine versus 2% in the uncontrolled group. A 2008 prospective study evaluating the equivalence of 1% versus 2% topical lidocaine during FFB demonstrated no difference in cough frequency or as needed doses of lidocaine by the bronchoscopist. The 2% lidocaine group received twice the mg/kg dose as the 1% lidocaine without increasing patient comfort (Hasmoni et al., 2008). Finally, the use of nebulized lidocaine during the FFB preparation is equivocal (Keane & McNicholas, 1992). Several studies have demonstrated less cough and safety when comparing nebulized lidocaine with other preparations (Gove et al., 1985; Graham et al., 1992) However, other studies were unable to demonstrate a benefit for nebulized lidocaine compared with saline placebo in terms of cough perception, patient discomfort, or use of supplemental lidocaine doses (Charalampidou et al., 2006; Stolz et al., 2005).

#### **5.2 Agents**

Lidocaine (or lignocaine) is the most commonly used topical anesthetic applied to the airway mucosa during FFB. Other agents that may be used include tetracaine (2%), benzocaine (10-20%), and cocaine (4-10%). Lidocaine is preferred as it is less toxic, more widely available to the bronchoscopist, and shorter acting than cocaine or tetracaine. Lidocaine is metabolized by the liver and may have side effects at serum levels greater than 5 microgram/ml. Benzocaine has duration of action of only five to ten minutes and is not ideal for FFB; its use is limited by potential toxicity due to methemoglobinemia. Tetracaine has a longer duration of action but a very narrow margin of safety and is not advocated for use in FFB. Use of cocaine is limited due to excess sympathetic nervous system activity and possible toxicity and potential for abuse. However, direct comparisons of lidocaine with other preparations such as cocaine have shown equivalence in terms of patient tolerance (Teale et al., 1990)

#### **5.3 Dosing of topical anesthesia**

Initial guidelines for lidocaine dosing published by the National Institutes of Health (NIH) in 1985 recommended no more than 400 mg cumulative dose of lidocaine for healthy asthmatics undergoing FFB. This recommendation was primarily based on expert opinion (NIH, 1985). The updated 1991 NIH guidelines for FFB in asthmatics simply stated the

includes the application of 2% viscous lidocaine for the nasal mucosa, nebulized 4% topical lidocaine for oral inhalation prior to the FFB, and application of 1% topical lidocaine during the procedure for additional upper and lower airway mucosal anesthesia to control coughing. This airway preparation uses approximately 500 mg of topical lidocaine. The amount of 1% lidocaine used is highly variable and physician dependent with approximately 100 mg used for direct application to the vocal cords and carina and additional lidocaine used for lower airway anesthesia to suppress coughing. There are relatively few studies examining the optimal lidocaine dosing for patient comfort and safety during FFB. A study examining various lidocaine amounts (mg/kg) and strengths ranging from 1% to 2% in 96 patients found no differences between the six groups in terms of patient comfort (Mainland et al., 2001). The author recommended use of 1% lidocaine for topical airway anesthesia based on similar amounts of supplemental lidocaine doses and serum lidocaine levels. An earlier 1985 study demonstrated there was no effect on patient comfort scores when a fixed dose of 370 mg of lidocaine was compared with higher lidocaine doses with as needed dosing (mean lidocaine dose=512 mg) (Sutherland et al., 1985). Notably, the airway preparation in the fixed dose group used 1% lidocaine versus 2% in the uncontrolled group. A 2008 prospective study evaluating the equivalence of 1% versus 2% topical lidocaine during FFB demonstrated no difference in cough frequency or as needed doses of lidocaine by the bronchoscopist. The 2% lidocaine group received twice the mg/kg dose as the 1% lidocaine without increasing patient comfort (Hasmoni et al., 2008). Finally, the use of nebulized lidocaine during the FFB preparation is equivocal (Keane & McNicholas, 1992). Several studies have demonstrated less cough and safety when comparing nebulized lidocaine with other preparations (Gove et al., 1985; Graham et al., 1992) However, other studies were unable to demonstrate a benefit for nebulized lidocaine compared with saline placebo in terms of cough perception, patient discomfort, or use of supplemental lidocaine

Lidocaine (or lignocaine) is the most commonly used topical anesthetic applied to the airway mucosa during FFB. Other agents that may be used include tetracaine (2%), benzocaine (10-20%), and cocaine (4-10%). Lidocaine is preferred as it is less toxic, more widely available to the bronchoscopist, and shorter acting than cocaine or tetracaine. Lidocaine is metabolized by the liver and may have side effects at serum levels greater than 5 microgram/ml. Benzocaine has duration of action of only five to ten minutes and is not ideal for FFB; its use is limited by potential toxicity due to methemoglobinemia. Tetracaine has a longer duration of action but a very narrow margin of safety and is not advocated for use in FFB. Use of cocaine is limited due to excess sympathetic nervous system activity and possible toxicity and potential for abuse. However, direct comparisons of lidocaine with other preparations such as cocaine have shown equivalence in terms of patient tolerance

Initial guidelines for lidocaine dosing published by the National Institutes of Health (NIH) in 1985 recommended no more than 400 mg cumulative dose of lidocaine for healthy asthmatics undergoing FFB. This recommendation was primarily based on expert opinion (NIH, 1985). The updated 1991 NIH guidelines for FFB in asthmatics simply stated the

doses (Charalampidou et al., 2006; Stolz et al., 2005).

**5.2 Agents** 

(Teale et al., 1990)

**5.3 Dosing of topical anesthesia** 

lowest topical anesthetic dose possible should be used (NIH, 1991). When the BTS published general guidelines for topical anesthesia in the routine clinical practice of FFB, their recommendation was based primarily on two recently published studies (BTS, 2001). A study of 48 asthmatics undergoing research FFB demonstrated safety with a mean dose of 8.2 mg/kg of lidocaine as the upper limit of normal (Langmack et al., 2000). Another smaller study by Milman et al. of 16 patients undergoing FFB recommended a maximum dosage of 6-7 mg/kg (Milman et al., 1998).

The current medical literature contains a substantial collection of studies evaluating serum lidocaine levels during FFB. These studies evaluating lidocaine dosing have been done to evaluate a variety of techniques in application of topical anesthesia (Ameer et al., 1989; Amitai et al., 1990, Berger et al., 1989; Boye & Bresden, 1979; Efthimiou et al., 1982; Gjonaj et al., 1997; Gomez et al., 1983; Jones et al., 1982; Karvonen et al., 1976; Korttila et al., 1981; Langmack et al., 2000; Le Lorier et al., 1979; Loukides et al., 2000; Mainland et al., 2001; McBurney et al., 1984; Milman et al., 1998; Patterson et al., 1975; Smith et al., 1985; Sucena et al., 2004; Sutherland et al., 1985). These twenty studies were reviewed by Frey et al. in their study of lidocaine dosing (Frey et al., 2008). This compilation of studies included a total of 457 patients whose mean age was 47.4 ± 23.7 years and the mean total dose of lidocaine was 488 ± 463 mg. The mean lidocaine dose (reported as adjusted for weight) was 9.7 ± 5.0 mg/kg. Only six of these studies gave a lidocaine dose greater than 8.2 mg/kg or total dose greater than 600 mg. None of the studies reported an average peak lidocaine level > 5.0 mg/kg, while only three of the 21 studies reported a maximum lidocaine level > 5.0 mg/kg. This cumulative data of nearly 500 patients did not suggest a trend towards lidocaine toxicity despite higher lidocaine levels than the BTS recommendations (Frey et al., 2008) The Frey study collected measured lidocaine dosing and serum levels for 154 patients with a mean age of 64.7 years undergoing FFB. Mean lidocaine usage was 15.4 ± 4.5 mg/kg (1.17±0.20 gm), mean serum lidocaine level was 1.6 ± 0.7 mg/mL, and mean blood methemoglobin level was 0.7 ± 0.3%. No clinical toxicity was noted and the authors adequately demonstrated the safety of higher doses of topical lidocaine (Frey et al., 2008).

Other studies have also demonstrated the safety of higher doses of lidocaine during FFB (Ameer et al., 1989; Gjonaj et al., 1997; Sucena et al., 2004]. In the earliest study in 1979, 12 FOB patients received an average of 600 mg of topical lidocaine. The maximum lidocaine level was found to be 3.79 μg/ml in a patient with hepatic metastases who only received 420 mg topical lidocaine (LeLorier et al., 1979). A follow-up study in 1982 by Efthimiou et al. of 41 FOB patients used a similar mean lidocaine dose (9.3 ± 0.5 mg/kg); mean peak levels were 2.9 ± 0.5 μg/ml and two patients had a lidocaine level > 5 μg/ml with no complications (Efthimiou et al., 1982). Ameer et al. compared an elderly group of 14 patients (mean age of 67 years) with a young group of five patients (mean age of 42 years). Both groups received total lidocaine doses of nearly 1200 mg without significant toxicity. No difference in mean or peak serum lidocaine was found between groups (Ameer et al., 1989). As part of a study evaluating the effect of lidocaine on endobronchial cultures, Berger et al. studied eight patients who received an average total lidocaine dose greater than 2000 mg. The mean serum level was 2.7 μg/ml and the peak level in one patient was 5.5 μg/ml; no toxicity was reported (Berger et al., 1989). In 1997, Gjonaj et al. evaluated 8 mg/kg vs. 4 mg/kg of nebulized 2% lidocaine in a pediatric population and found no evidence of toxicity. The total lidocaine dose for the high-dose group was 10.13 ± 1.26 mg/kg with mean serum lidocaine levels of 1.17 ± 0.54 μg/ml and peak levels of 2.27 μg/ml [Gjonaj et al.,

Monitoring, Sedation, and Anesthesia for Flexible Fiberoptic Bronchoscopy 47

that bronchoalveolar lavage could be performed successfully in ventilated patients without complications by using specific bronchoscopy techniques and proper ventilator

Flexible fiberoptic bronchoscopy is a very important and useful tool for the pulmonologist to diagnose and treat various pulmonary disorders. Overall, it is a very safe procedure with low complication rates reported. There are several published guidelines to provide general guidance on the conduct of FFB. With proper preparation of the patient and close monitoring of the patient's condition, FFB can be performed with the desired outcome. An important component of the overall process is to ensure that the patient is both as safe and comfortable as possible. Choosing the proper agent and level of sedation along with adequate topical anesthesia can make the experience better for the patient and the bronchoscopist. This chapter has provided a broad delineation of the studies in the medical literature that address the role of monitoring, oxygen supplementation, intravenous

Abernethy, DR. & Greenblatt, DJ. (1983). Impairment of Lidocaine Clearance in Elderly Male

Ameer, B.; Burlingame, MB. & Harman, EM. (1989). Systemic Absorption of Topical

American Thoracic Society. (1987). Guidelines for Fiberoptic Bronchoscopy in Adults.

Amitai, Y.; Zylber-Katz, E.; Avital, A.; Zangen, D. & Noviski N. (1990). Serum Lidocaine

Anzueto, A.; Levine, SM. & Jenkinson, SG. (1992). The Technique of Fiberoptic

Berger, R.; McConnell, JW.; Phillips, B. & Overman. TL. (1989). Safety and Efficacy of Using

Berkenbosch, JW.; Graff, GR.; Stark, JM.; Ner, Z. & Tobias, JD. (2004). Use of a Remifentanil-

Anaesthesia,Vol.14, No.11, (November 2004), pp. 941-946, ISSN 1155-5645 Bjørtuft, Ø.; Brosstad, F. & Boe, J. (1998). Bronchoscopy with Transbronchial Biopsies:

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Lidocaine in Elderly and Young Adults Undergoing Bronchoscopy. Pharmacotherapy, Vol.9, No.2, (March-April 1989), pp.74-81, ISSN 0277-0008 American Society of Anesthesiologists Task Force on Sedation and Analgesia by Non-

Anesthesiologists. (2002). Practice Guidelines for Sedation and Analgesia by Non-Anesthesiologists. Anesthesiology, Vol.96, No.4, (April 2002), pp.1004-1017. ISSN

American Review of Respiratory Disease, Vol.136, No.4, (October 1987), p.1066,

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Bronchoscopy. Diagnostic and Therapeutic Uses in Intubated, Ventilated Patients. Journal of Critical Illness, Vol.7, No.10, (October 1992), pp. 1657-64, ISSN 1040-0257

High-Dose Topical and Nebulized Anesthesia to Obtain Endobronchial Cultures.

Propofol Mixture for Pediatric Flexible Fiberoptic Bronchoscopy Sedation. Pediatric

Measurement of Bleeding Volume and Evaluation of the Predictive Value of

management (Hertz et al., 1991)

sedation, and topical anesthesia.

0003-3022

ISSN 0003-0805

**7. Conclusion** 

**8. References** 

1997). The most recent studies by Loukides (mean lidocaine dose of 622 ± 20 mg) and Sucena (mean lidocaine dose of 11.6 ± 3.1 mg/kg) also found no toxicities with these doses (Loukides et al., 2000; Sucena et al., 2004). Notably, five of 30 patients studied by Sucena et al. had serum levels greater than 5 μg/ml but no clinical toxicity (Sucena et al., 2004).

#### **5.4 Complications**

Serious effects of lidocaine toxicity (seizures, methemoglobinemia, respiratory failure, and cardiac arrhythmias) are reported to begin at serum levels > 5 μg/ml (Fahimi et al., 2007; Rodins et al., 2003; Sutherland et al., 1985; Wu et al., 1993). At lower serum concentrations, milder side effects such as drowsiness, dizziness, euphoria, paresthesias, nausea, and vomiting may occur. Consideration should also be given to allergic reactions due to lidocaine administration (Bose & Colt, 2008). Serum lidocaine clearance can be decreased in the elderly, patients with cardiac or liver disease, and those patients taking certain medications such as beta-blockers, cimetidine, or verapamil (Abernethy et al., 1983, Smith et al., 1985, Thomson et al., 1973). Despite these potential toxicities, there are few reports of significant complications related to topical anesthetic administration. An early survey of nearly 25,000 FFB only noted six patients with complications (respiratory arrest, seizures) related to airway anesthesia and only one patient with methemoglobinemia (Credle et al., 1974). Additional concern was raised about volunteer FFB and the use of topical anesthesia was noted when a 19-year-old healthy volunteer died from lidocaine toxicity after undergoing a research FFB (Day et al., 1998).

Although elevated methemoglobin levels are another potential concern with the use of higher lidocaine doses, there is scant information supporting this as a significant clinical issue. The 1974 bronchoscopy survey only noted symptoms related to methemoglobinemia in a single patient who received tetracaine (Credle et al., 1974). Recently, Karim et al. reported three patients who received topical lidocaine who developed clinical evidence of methemoglobinemia; one patient was undergoing FOB and was taking trimethoprimsulfamethoxazole (Karim et al., 2011). Most reported methemoglobinemia cases have been in association with benzocaine used in combination with lidocaine or as the sole topical anesthetic (Kern et al., 2000; Kucshner et al., 2000; O'Donohue & Moss, 1980; Rodriguez et al., 1994).

#### **6. Bronchoscopy in the ICU**

The 2001 BTS guidelines comment specifically on the differences for FFB performed in the intensive care unit (ICU) (BTS, 2001). There are a significant range of diagnostic (endobronchial cultures, lung collapse, hemoptysis, acute inhalation injury) and therapeutic (excess secretions, treatment of hemoptysis, foreign body removal) indications reported in the ICU setting (Anzueto et al., 1992; Shennib & Baislam, 1996). Intensive care units should be able to provide urgent and timely FFB to carry out these indications. From a safety perspective, these critically ill patients should be considered high risk for complications and absolutely require physiological monitoring during and after the procedure. In ventilated patients, the bronchoscopist can achieve higher levels of sedation and/or anesthesia to complete the diagnostic or therapeutic requirements for FFB. However, the bronchoscope must be able to pass easily through the endotracheal tube and the technique must allow adequate ventilation and oxygenation throughout (BTS, 2001). Hertz et al. demonstrated that bronchoalveolar lavage could be performed successfully in ventilated patients without complications by using specific bronchoscopy techniques and proper ventilator management (Hertz et al., 1991)

#### **7. Conclusion**

46 Global Perspectives on Bronchoscopy

1997). The most recent studies by Loukides (mean lidocaine dose of 622 ± 20 mg) and Sucena (mean lidocaine dose of 11.6 ± 3.1 mg/kg) also found no toxicities with these doses (Loukides et al., 2000; Sucena et al., 2004). Notably, five of 30 patients studied by Sucena et

Serious effects of lidocaine toxicity (seizures, methemoglobinemia, respiratory failure, and cardiac arrhythmias) are reported to begin at serum levels > 5 μg/ml (Fahimi et al., 2007; Rodins et al., 2003; Sutherland et al., 1985; Wu et al., 1993). At lower serum concentrations, milder side effects such as drowsiness, dizziness, euphoria, paresthesias, nausea, and vomiting may occur. Consideration should also be given to allergic reactions due to lidocaine administration (Bose & Colt, 2008). Serum lidocaine clearance can be decreased in the elderly, patients with cardiac or liver disease, and those patients taking certain medications such as beta-blockers, cimetidine, or verapamil (Abernethy et al., 1983, Smith et al., 1985, Thomson et al., 1973). Despite these potential toxicities, there are few reports of significant complications related to topical anesthetic administration. An early survey of nearly 25,000 FFB only noted six patients with complications (respiratory arrest, seizures) related to airway anesthesia and only one patient with methemoglobinemia (Credle et al., 1974). Additional concern was raised about volunteer FFB and the use of topical anesthesia was noted when a 19-year-old healthy volunteer died from lidocaine toxicity after

Although elevated methemoglobin levels are another potential concern with the use of higher lidocaine doses, there is scant information supporting this as a significant clinical issue. The 1974 bronchoscopy survey only noted symptoms related to methemoglobinemia in a single patient who received tetracaine (Credle et al., 1974). Recently, Karim et al. reported three patients who received topical lidocaine who developed clinical evidence of methemoglobinemia; one patient was undergoing FOB and was taking trimethoprimsulfamethoxazole (Karim et al., 2011). Most reported methemoglobinemia cases have been in association with benzocaine used in combination with lidocaine or as the sole topical anesthetic (Kern et al., 2000; Kucshner et al., 2000; O'Donohue & Moss, 1980; Rodriguez et

The 2001 BTS guidelines comment specifically on the differences for FFB performed in the intensive care unit (ICU) (BTS, 2001). There are a significant range of diagnostic (endobronchial cultures, lung collapse, hemoptysis, acute inhalation injury) and therapeutic (excess secretions, treatment of hemoptysis, foreign body removal) indications reported in the ICU setting (Anzueto et al., 1992; Shennib & Baislam, 1996). Intensive care units should be able to provide urgent and timely FFB to carry out these indications. From a safety perspective, these critically ill patients should be considered high risk for complications and absolutely require physiological monitoring during and after the procedure. In ventilated patients, the bronchoscopist can achieve higher levels of sedation and/or anesthesia to complete the diagnostic or therapeutic requirements for FFB. However, the bronchoscope must be able to pass easily through the endotracheal tube and the technique must allow adequate ventilation and oxygenation throughout (BTS, 2001). Hertz et al. demonstrated

al. had serum levels greater than 5 μg/ml but no clinical toxicity (Sucena et al., 2004).

**5.4 Complications** 

al., 1994).

**6. Bronchoscopy in the ICU** 

undergoing a research FFB (Day et al., 1998).

Flexible fiberoptic bronchoscopy is a very important and useful tool for the pulmonologist to diagnose and treat various pulmonary disorders. Overall, it is a very safe procedure with low complication rates reported. There are several published guidelines to provide general guidance on the conduct of FFB. With proper preparation of the patient and close monitoring of the patient's condition, FFB can be performed with the desired outcome. An important component of the overall process is to ensure that the patient is both as safe and comfortable as possible. Choosing the proper agent and level of sedation along with adequate topical anesthesia can make the experience better for the patient and the bronchoscopist. This chapter has provided a broad delineation of the studies in the medical literature that address the role of monitoring, oxygen supplementation, intravenous sedation, and topical anesthesia.

#### **8. References**


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**Section 2** 

**Bronchoscopic Investigations** 


## **Section 2**

**Bronchoscopic Investigations** 

54 Global Perspectives on Bronchoscopy

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**3** 

*India* 

Mohammad Shameem

*Aligarh Muslim University, Aligarh, Uttar Pradesh* 

**Role of Broncoalveolar Lavage in Diagnosis** 

*Department of Tuberculosis and Chest Diseases, Jawaharlal Nehru Medical College,* 

The lung is continuously exposed to the external environment and mixtures of complex antigens through the air. It is estimated that the resting human adult inhales 12,000 liters of air per day, while even mild physical activity can double or triple this amount (1). Protective immunity against inhaled antigens is mediated by the lymphocytes that are localized to the surface of the respiratory tract. The compartments in the lung where lymphocytes are present are (i) the epithelium and lamina propria of the air-conducting regions, (ii) the bronchus-associated lymphoid tissue (found commonly in certain animals i.e. rabbit and rats) (iii) the pulmonary interstitium and vascular beds (iv) the bronchoalveolar space. In addition to anatomical barriers, such as airway angulation, mucociliary clearance, and coughing, both humoral and cellular defense mechanisms play an important role in maintaining the viability of the host. One of the first lines of defense against particulate matter is mucociliary clearance and phagocytic activity of alveolar macrophages. Antigens entering the pulmonary tract encounter antigen-presenting cells comprised of alveolar and

**2. Bronchoalveolar lavage for diagnosis of various respiratory disorders** 

Bronchoscopy with bronchoalveolar lavage (BAL) is an important tool for the diagnosis of pulmonary infections and malignancies. Flexible fiberoptic bronchoscopy is a relatively safe and minimally invasive means by which to obtain bronchoalveolar lavage fluid (BALF). It is usually well tolerated by patients and can be performed safely even on those patients who

The diagnostic and prognostic utility of BAL was first evaluated in the 1980s (2). The investigatory technique of BAL has become one of the most valuable research tools for studying inflammatory mechanisms in a wide range of diseases that affect the lungs and airways in humans. In addition, cytological and microbiological testing of BAL samples are of established value for assisting in clinical diagnosis and management of many lung

Since the introduction of the rigid bronchoscope by Dr. Jackson in 1904, BAL is a diagnostic procedure in which a fiber-optic bronchoscope is passed through the mouth or nose into the lung and fluid is put into a small part of the lung and then recollected for examination.

**1. Introduction** 

are quite ill.

interstitial macrophages and effector T lymphocytes.

diseases, and these procedures are available routinely.

## **Role of Broncoalveolar Lavage in Diagnosis**

#### Mohammad Shameem

*Department of Tuberculosis and Chest Diseases, Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, Uttar Pradesh India* 

#### **1. Introduction**

The lung is continuously exposed to the external environment and mixtures of complex antigens through the air. It is estimated that the resting human adult inhales 12,000 liters of air per day, while even mild physical activity can double or triple this amount (1). Protective immunity against inhaled antigens is mediated by the lymphocytes that are localized to the surface of the respiratory tract. The compartments in the lung where lymphocytes are present are (i) the epithelium and lamina propria of the air-conducting regions, (ii) the bronchus-associated lymphoid tissue (found commonly in certain animals i.e. rabbit and rats) (iii) the pulmonary interstitium and vascular beds (iv) the bronchoalveolar space. In addition to anatomical barriers, such as airway angulation, mucociliary clearance, and coughing, both humoral and cellular defense mechanisms play an important role in maintaining the viability of the host. One of the first lines of defense against particulate matter is mucociliary clearance and phagocytic activity of alveolar macrophages. Antigens entering the pulmonary tract encounter antigen-presenting cells comprised of alveolar and interstitial macrophages and effector T lymphocytes.

#### **2. Bronchoalveolar lavage for diagnosis of various respiratory disorders**

Bronchoscopy with bronchoalveolar lavage (BAL) is an important tool for the diagnosis of pulmonary infections and malignancies. Flexible fiberoptic bronchoscopy is a relatively safe and minimally invasive means by which to obtain bronchoalveolar lavage fluid (BALF). It is usually well tolerated by patients and can be performed safely even on those patients who are quite ill.

The diagnostic and prognostic utility of BAL was first evaluated in the 1980s (2). The investigatory technique of BAL has become one of the most valuable research tools for studying inflammatory mechanisms in a wide range of diseases that affect the lungs and airways in humans. In addition, cytological and microbiological testing of BAL samples are of established value for assisting in clinical diagnosis and management of many lung diseases, and these procedures are available routinely.

Since the introduction of the rigid bronchoscope by Dr. Jackson in 1904, BAL is a diagnostic procedure in which a fiber-optic bronchoscope is passed through the mouth or nose into the lung and fluid is put into a small part of the lung and then recollected for examination.

Role of Broncoalveolar Lavage in Diagnosis 59

wash out an entire lung in patients with alveolar proteinosis, which requires repeated instillation of 1 L of fluid (in total 10–40 L for each lung) through a double-lumen

BAL is usually performed during fibreoptic bronchoscopy with topical anaesthetic after general inspection of the tracheobronchial tree. BAL can also be performed under general anaesthesia and in ventilated patients through a rigid bronchoscope or an endotracheal

The site of lavage depends on the localization of the abnormalities. In case of localized disease, for instance an infection with a radiographically apparent infiltrate or a malignancy, the involved segment should be sampled (10). In diffuse lung disease, the middle lobe or lingular lobe is commonly used as a standard site for BAL. This is often the most accessible site and the fluid obtained at one site is representative of the whole lung in diffuse lung diseases (11). If anatomical difficulties are encountered in both lobes the anterior segment of either the upper or lower lobe may be used. Using the method described, approximately 1.5-

Usually, the lavage is performed using sterile, unbuffered isotonic saline (0.9% NaCl) solution and preferably the saline is preheated to body-temperature (37ºC) to help prevent coughing and increase cellular yield (12). The volume varies between 100 and 300 ml in aliquots of 20 to 50 ml (13). The ERS task force recommended the use of 200-240 ml divided

The fluid is instilled with syringes through the biopsy channel of bronchoscope and immediately recovered by applying suction (25-100 mmHg), using a standard number of input aliquots of 20–60 mL (commonly four to five aliquots are recommended) up to a total volume of 100–300 mL. Smaller instilled volumes (<100 mL) increase the likelihood of contamination by the bronchial spaces, including inflammatory cells derived from the larger

The first aspirated volume is normally smaller than the following ones. Usually, 40–70% of the instilled volume is recovered. In obstructive airway disease and emphysema the recovery rate is significantly lower and may be <30%. The yield is also reduced in healthy smokers and the elderly. In addition, fluid recovery may be low with a poor wedge position leading to leakage of lavage fluid around the bronchoscope, which is associated with cough. Differential evaluation of the ''bronchial'' (first aliquot) and ''alveolar'' (subsequent aliquots) samples may be useful in airway diseases. Siliconised or plastic containers should be used for collection and processing of BAL fluid to avoid loss of cells through adhesion to

The BAL procedure is practically associated with no mortality and carries a low complication rate of 0–2.3% [15–17]. After BAL procedure there is fever in some hours and a

endotracheal tube during general anaesthesia.

**5. Site of bronchoalveolar lavage** 

**5.1 Fluid instillation and recovery** 

3% of the lung (approximately 1,000,000 alveoli) are sampled (4).

airways, which may skew the differential cell counts [14].

tube.

in four aliquots.

glass surfaces.

**6. Safety aspects** 

Bronchoalveolar lavage is typically performed to diagnose lung disease. Primarily, BAL was used as a treatment for patients who suffered from diseases associated with accumulation of purulent secretions such as alveolar proteinosis, cystic fibrosis and bacterial pneumonia (3).

#### **3. Definition**

By definition BAL is a method for the recovery of cellular and non-cellular components from the lower respiratory tract (e.g. alveoli) (4). It is a safe technique, with few major complications (5). In many cases (e.g. pulmonary proteinosis, alveolar hemorrhage, eosinophilic pneumonia) BAL can replace lung biopsy (6). Possible uses of BAL in diagnostics are summarized in following table


Table 1. Pulmonary diseases where BALF can be used to a diagnosis (7, 8, 9).

#### **4. Procedure**

Bronchoalveolar Lavage is a minimally invasive technique which is used to obtain cells, inhaled particles, infectious organisms and solutes from the alveolar spaces of the lung. To achieve this, a sufficient volume of lavage fluid must be instilled to ensure a sufficient aspirate. In adults, a minimum of 100 mL of lavage fluid should be instilled. Besides diagnostic BAL, there are other lavage techniques are used and they differ in the following ways: 1) Bronchial lavage (or bronchial washing) requires relatively little instilled fluid (10 - 30 mL) and samples from large airways for bacteriological study and/or tumour cytology; 2) therapeutic lavage usees small volumes and is used to remove sticky bronchial secretions in patients with asthma or cystic fibrosis; and 3) whole lung lavage is performed in order to

Bronchoalveolar lavage is typically performed to diagnose lung disease. Primarily, BAL was used as a treatment for patients who suffered from diseases associated with accumulation of purulent secretions such as alveolar proteinosis, cystic fibrosis and bacterial pneumonia (3).

By definition BAL is a method for the recovery of cellular and non-cellular components from the lower respiratory tract (e.g. alveoli) (4). It is a safe technique, with few major complications (5). In many cases (e.g. pulmonary proteinosis, alveolar hemorrhage, eosinophilic pneumonia) BAL can replace lung biopsy (6). Possible uses of BAL in

**Non-infectious Infectious** 

Sarcoidosis (Ventilator-associated) pneumonia

Connective tissue disorders Aspergillus fumigatus infection

Alveolar proteinosis Mycoplasma pneumoniae pneumonia Eosinophilic pneumonia Chlamydia pneumoniae pneumonia

Bronchoalveolar Lavage is a minimally invasive technique which is used to obtain cells, inhaled particles, infectious organisms and solutes from the alveolar spaces of the lung. To achieve this, a sufficient volume of lavage fluid must be instilled to ensure a sufficient aspirate. In adults, a minimum of 100 mL of lavage fluid should be instilled. Besides diagnostic BAL, there are other lavage techniques are used and they differ in the following ways: 1) Bronchial lavage (or bronchial washing) requires relatively little instilled fluid (10 - 30 mL) and samples from large airways for bacteriological study and/or tumour cytology; 2) therapeutic lavage usees small volumes and is used to remove sticky bronchial secretions in patients with asthma or cystic fibrosis; and 3) whole lung lavage is performed in order to

Hypersensitivity pneumonitis Pneumocystis pneumonia

Idiopatic lung fibrosis Mycobacterial infection

Malignancies Toxoplasma pneumonia

Alveolar hemorrhage Legionella infection

pneumonia Cryptococcal infection

Asbestosis Histoplasma infection Silicosis Strongyloides infection

Table 1. Pulmonary diseases where BALF can be used to a diagnosis (7, 8, 9).

Langerhans cell histiocytosis Viral pneumonia

**3. Definition** 

**4. Procedure** 

diagnostics are summarized in following table

Bronchiolitis obliterans with organizing

wash out an entire lung in patients with alveolar proteinosis, which requires repeated instillation of 1 L of fluid (in total 10–40 L for each lung) through a double-lumen endotracheal tube during general anaesthesia.

BAL is usually performed during fibreoptic bronchoscopy with topical anaesthetic after general inspection of the tracheobronchial tree. BAL can also be performed under general anaesthesia and in ventilated patients through a rigid bronchoscope or an endotracheal tube.

### **5. Site of bronchoalveolar lavage**

The site of lavage depends on the localization of the abnormalities. In case of localized disease, for instance an infection with a radiographically apparent infiltrate or a malignancy, the involved segment should be sampled (10). In diffuse lung disease, the middle lobe or lingular lobe is commonly used as a standard site for BAL. This is often the most accessible site and the fluid obtained at one site is representative of the whole lung in diffuse lung diseases (11). If anatomical difficulties are encountered in both lobes the anterior segment of either the upper or lower lobe may be used. Using the method described, approximately 1.5- 3% of the lung (approximately 1,000,000 alveoli) are sampled (4).

Usually, the lavage is performed using sterile, unbuffered isotonic saline (0.9% NaCl) solution and preferably the saline is preheated to body-temperature (37ºC) to help prevent coughing and increase cellular yield (12). The volume varies between 100 and 300 ml in aliquots of 20 to 50 ml (13). The ERS task force recommended the use of 200-240 ml divided in four aliquots.

#### **5.1 Fluid instillation and recovery**

The fluid is instilled with syringes through the biopsy channel of bronchoscope and immediately recovered by applying suction (25-100 mmHg), using a standard number of input aliquots of 20–60 mL (commonly four to five aliquots are recommended) up to a total volume of 100–300 mL. Smaller instilled volumes (<100 mL) increase the likelihood of contamination by the bronchial spaces, including inflammatory cells derived from the larger airways, which may skew the differential cell counts [14].

The first aspirated volume is normally smaller than the following ones. Usually, 40–70% of the instilled volume is recovered. In obstructive airway disease and emphysema the recovery rate is significantly lower and may be <30%. The yield is also reduced in healthy smokers and the elderly. In addition, fluid recovery may be low with a poor wedge position leading to leakage of lavage fluid around the bronchoscope, which is associated with cough. Differential evaluation of the ''bronchial'' (first aliquot) and ''alveolar'' (subsequent aliquots) samples may be useful in airway diseases. Siliconised or plastic containers should be used for collection and processing of BAL fluid to avoid loss of cells through adhesion to glass surfaces.

#### **6. Safety aspects**

The BAL procedure is practically associated with no mortality and carries a low complication rate of 0–2.3% [15–17]. After BAL procedure there is fever in some hours and a

Role of Broncoalveolar Lavage in Diagnosis 61

dispersive X-ray spectrometry. Lymphocyte subpopulations can be identified by immunocytochemical methods, immunofluorescence or flow cytometry using monoclonal

These investigations are not recommended as a routine procedure for all BAL specimens. They are indicated in cases with high lymphocyte counts, such as extrinsic allergic alveolitis, or if Langerhans cell histiocytosis is suspected CD3. CD4, CD8, CD20 and markers of T-cell activation can be determined. CD1a or Langerin are very specific markers of Langerhans cell histiocytosis.

There are some studies also performed for research purposes including functional studies of viable BAL cells, cell cultivation in appropriate culture medium and determination of mediators along with the mechanisms that appear to regulate the mediator release. Cells can also be probed with molecular biology to investigate gene activation and intracellular

The BAL fluid obtained from healthy, nonsmoking adults without lung disease contains only small percentages of lymphocytes, neutrophils and other inflammatory cells; alveolar macrophages are the predominant cell population (80–90%) (fig. 1a). Differential cell count in healthy non-smokers have been reported to show macrophages >80%, lymphocytes ≤15%,

Flow cytometry is also a useful tool to detect markers of malignant lymphoma [21].

**7. Normal values of BAL in healthy volunteers** 

neutrophils ≤3%, eosinophils ≤0.5%, and mast cells ≤0.5%.

(a) (b)

Fig. 1. Bronchoalveolar lavage in a) a healthy nonsmoker and b) a healthy smoker [22].

antibody techniques [20].

signaling pathways.

transient decrease in lung function parameters, both usually self-limited and resolving within 24 h. These are the most frequent adverse effects and occur in 3–30% of patients, depending on the instilled volume. Other adverse effects include short-lasting alveolar infiltration, wheezing and bronchospasm in patients with hyper-reactive airways. Major or late complications are only seen in patients with severe lung or heart disease, and bleeding has only been reported in patients with clotting disorders or thrombocytopenia. Risk factors for developing adverse effects are: 1) extensive pulmonary infiltrates, an arterial oxygen tension <8.0 kPa (<60 mmHg) and an oxygen saturation <90%; 2) a forced expiratory volume in 1 s <1.0 L; 3) prothrombin time >50 s and platelet counts <20,000 platelets/mL; 4) significant comorbidity; and 5) bronchial hyperreactivity.

#### **6.1 Quality control of BALF**

To ensure that the obtained material represents the situation in the alveoli, a number of criteria have been established. A BALF is regarded non-representative if it fulfills one of the following criteria: i) volume <20 ml, ii) total cell count <60,000 cells/ml, iii) presence of >1% squamous epithelial cells, iv) presence of >5% bronchial epithelial cells, v) presence of extensive amounts of debris, vi) severely damaged cell morphology.

#### **6.2 Specimen processing**

The total fluid recovered is kept at room temperature and should be transported to the laboratory within 1 hr because the cells are not well preserved in the saline solution. The fluid should be pooled into a single container and total volume should be measured. The lavage fluid frequently contains large amounts of mucus; therefore, filtration through cotton gauze or nylon mesh is often performed. Filtration leads to a preferential loss of bronchial epithelial cells without a significant effect on the total cell count and cell differentials. After filtration, the fluid is centrifuged for 10 min at 500g and after this the supernatant can be stored at -20°C or -70°C for subsequent analysis of soluble components. The total number of cells is counted in a haemocytometer, either in a sample of the pooled native fluid or in a resuspension of the cells after the first centrifugation. Washing procedures result in a loss of total cell count but lead to an increase in cell viability of the remaining cells. The total cell count is usually expressed as the total number of cells recovered per lavage but also as the concentration of cells per mL of recovered fluid. Cell viability is assessed by trypan blue exclusion and should range from 80% to 95% [18, 19].

For the enumeration of cell differentials, at least 600 cells are counted on cytocentrifuge or cell smear preparations after staining with May-Grunwald-Giemsa stain. A high percentage of epithelial cells (>5%) is indicative of contamination of the alveolar samples by bronchial cells. At least three unstained slides should be stored so that special stains (iron, periodic acid–Schiff (PAS), silver, toluidine blue, fat or Ziehl–Neelsen) can be performed as per need.

Besides these routine investigations, further work-up can be performed as needed. For example, if a tumor is suspected the Papanicolau stain can be applied. If infection is suspected, a complete microbiological assessment, including cultures, should be performed. To document asbestos exposure, quantitative determination of asbestos bodies can be made after vacuum filtration of the native BAL fluid through a 0.45-1.2 µm Millipore membrane. The exact dust composition can be determined by electron microscopy with energy

transient decrease in lung function parameters, both usually self-limited and resolving within 24 h. These are the most frequent adverse effects and occur in 3–30% of patients, depending on the instilled volume. Other adverse effects include short-lasting alveolar infiltration, wheezing and bronchospasm in patients with hyper-reactive airways. Major or late complications are only seen in patients with severe lung or heart disease, and bleeding has only been reported in patients with clotting disorders or thrombocytopenia. Risk factors for developing adverse effects are: 1) extensive pulmonary infiltrates, an arterial oxygen tension <8.0 kPa (<60 mmHg) and an oxygen saturation <90%; 2) a forced expiratory volume in 1 s <1.0 L; 3) prothrombin time >50 s and platelet counts <20,000 platelets/mL; 4)

To ensure that the obtained material represents the situation in the alveoli, a number of criteria have been established. A BALF is regarded non-representative if it fulfills one of the following criteria: i) volume <20 ml, ii) total cell count <60,000 cells/ml, iii) presence of >1% squamous epithelial cells, iv) presence of >5% bronchial epithelial cells, v) presence of

The total fluid recovered is kept at room temperature and should be transported to the laboratory within 1 hr because the cells are not well preserved in the saline solution. The fluid should be pooled into a single container and total volume should be measured. The lavage fluid frequently contains large amounts of mucus; therefore, filtration through cotton gauze or nylon mesh is often performed. Filtration leads to a preferential loss of bronchial epithelial cells without a significant effect on the total cell count and cell differentials. After filtration, the fluid is centrifuged for 10 min at 500g and after this the supernatant can be stored at -20°C or -70°C for subsequent analysis of soluble components. The total number of cells is counted in a haemocytometer, either in a sample of the pooled native fluid or in a resuspension of the cells after the first centrifugation. Washing procedures result in a loss of total cell count but lead to an increase in cell viability of the remaining cells. The total cell count is usually expressed as the total number of cells recovered per lavage but also as the concentration of cells per mL of recovered fluid. Cell viability is assessed by trypan blue

For the enumeration of cell differentials, at least 600 cells are counted on cytocentrifuge or cell smear preparations after staining with May-Grunwald-Giemsa stain. A high percentage of epithelial cells (>5%) is indicative of contamination of the alveolar samples by bronchial cells. At least three unstained slides should be stored so that special stains (iron, periodic acid–Schiff (PAS), silver, toluidine blue, fat or Ziehl–Neelsen) can be performed as per need. Besides these routine investigations, further work-up can be performed as needed. For example, if a tumor is suspected the Papanicolau stain can be applied. If infection is suspected, a complete microbiological assessment, including cultures, should be performed. To document asbestos exposure, quantitative determination of asbestos bodies can be made after vacuum filtration of the native BAL fluid through a 0.45-1.2 µm Millipore membrane. The exact dust composition can be determined by electron microscopy with energy

significant comorbidity; and 5) bronchial hyperreactivity.

exclusion and should range from 80% to 95% [18, 19].

extensive amounts of debris, vi) severely damaged cell morphology.

**6.1 Quality control of BALF** 

**6.2 Specimen processing** 

dispersive X-ray spectrometry. Lymphocyte subpopulations can be identified by immunocytochemical methods, immunofluorescence or flow cytometry using monoclonal antibody techniques [20].

These investigations are not recommended as a routine procedure for all BAL specimens. They are indicated in cases with high lymphocyte counts, such as extrinsic allergic alveolitis, or if Langerhans cell histiocytosis is suspected CD3. CD4, CD8, CD20 and markers of T-cell activation can be determined. CD1a or Langerin are very specific markers of Langerhans cell histiocytosis. Flow cytometry is also a useful tool to detect markers of malignant lymphoma [21].

There are some studies also performed for research purposes including functional studies of viable BAL cells, cell cultivation in appropriate culture medium and determination of mediators along with the mechanisms that appear to regulate the mediator release. Cells can also be probed with molecular biology to investigate gene activation and intracellular signaling pathways.

#### **7. Normal values of BAL in healthy volunteers**

The BAL fluid obtained from healthy, nonsmoking adults without lung disease contains only small percentages of lymphocytes, neutrophils and other inflammatory cells; alveolar macrophages are the predominant cell population (80–90%) (fig. 1a). Differential cell count in healthy non-smokers have been reported to show macrophages >80%, lymphocytes ≤15%, neutrophils ≤3%, eosinophils ≤0.5%, and mast cells ≤0.5%.

Fig. 1. Bronchoalveolar lavage in a) a healthy nonsmoker and b) a healthy smoker [22].

Role of Broncoalveolar Lavage in Diagnosis 63

haemosiderin-laden macrophages on BAL cytology enables a diagnosis to be made even in cases with occult bleeding. In patients with fresh bleeding episodes free red blood cells in the fluid and fragments of ingested red blood cells within the cytoplasm of macrophages are

To asses the severity of bleeding, the percentage of siderophages can easily be counted. It has been shown that a percentage of siderophages ≥20% is sufficient for a diagnosis of DAH. Many syndromes belong to this group and other clinical and laboratory findings must be investigated to establish the cause of the bleeding. In the clinical setting, chronic left heart failure with pulmonary congestion is one of the most frequent underlying conditions for the finding of DAH in BAL fluid examination. Endogenous bleeding has to be differentiated from exogenous iron load of the lungs. Exogenous siderosis does not show roundish fragments of erythrocytes but irregular shaped dust particles engulfed by macrophages.

In the differential diagnosis of recurrent pneumonia, gastro-oesophageal reflux with aspiration needs to be considered. The BAL cell differential may show a mixed pattern with increase in lymphocytes, neutrophils and eosinophils. The characteristic diagnostic finding is the presence of large numbers of lipid-laden macrophages and is highly suggestive of

In ILD due to mineral dust exposure, BAL can confirm exposure by the detection of dust

a. Asbestos-related disease: Asbestos bodies in BAL fluid can be detected by smear technique or cytocentrifuge technique. However quantification of asbestos bodies by a specific Millipore filtration is a more sensitive technique. The results are expressed as number of asbestos bodies per mL of BAL fluid, which shows a relatively good correlation with the asbestos body count in lung tissue analysis. However, 10–15% of subjects with known occupational asbestos exposure may have no detectable asbestos bodies in their BAL fluid. Thus, a negative BAL asbestos body count does not exclude

b. Chronic beryllium disease: This condition is clinically, radiologically and histologically identical to sarcoidosis and in this condition BAL lymphocytes have an increase in the CD4/CD8 ratio . Because the antigen is known, a diagnostic in vitro lymphocyte transformation test can be performed. Lymphocytes from blood or BAL fluid are incubated with beryllium salts and the beryllium-specific proliferation of the lymphocytes is quantified. A positive lymphocyte transformation test of BAL T-cells to beryllium salts is highly sensitive and specific (definitely more sensitive than the blood

Eosinophilic lung disease can be diagnosed when there are ≥25% eosinophils in BAL of the radiologically affected segment. In both acute and chronic eosinophilic pneumonia the

test) and always recommended in doubtful cases to confirm the diagnosis.

pathognomonic.

**7.2.4 Chronic aspiration** 

**7.2.5 Pneumoconioses** 

asbestos-related disease.

**7.2.6 Eosinophilic lung disease** 

lipoid pneumonia caused by chronic aspiration.

particles in alveolar macrophages. It is of two types:

Cigarette smoking is a strong confounding factor with significant effects on BAL samples. The alveolar macrophages from smokers show a 3 to 5 fold increase and characteristic morphology: many of them are much larger than those in nonsmokers and contain cytoplasmic inclusion bodies (smoker's inclusion bodies) consisting of tar products, lipids, lipofuscin and other substances (fig. 1b).

#### **7.1 BAL in the diagnosis of diffuse parenchymal lung disease**

BAL is indicated in every patient with nuclear pulmonary shadowing or interstitial lung disease (ILD). BAL findings may be very specific, so that they can directly confirm a particular diagnosis. BAL should not be considered as a stand-alone diagnostic test and should be interpreted in the context of clinical, laboratory and radiographical high resolution computed tomography (HRCT) findings. It has been used in diagnostic and prognostic evaluation in diffuse parenchymal lung disease for three decades and has a central role in the diagnosis of a number of rare disorders and in excluding opportunistic infection in treated patients. It also has an important role in the diagnosis of many prevalent disorders, including sarcoidosis, hypersensitivity pneumonitis and idiopathic pulmonary fibrosis.

#### **7.2 Specific BAL findings in rare diseases**

#### **7.2.1 Pulmonary alveolar proteinosis**

Pulmonary alveolar proteinosis is one of the few diseases in which BAL can confirm the diagnosis and replace lung biopsy. In pulmonary alveolar protienosis the BAL fluid is macroscopically milky and turbid. Under light microscopy the characteristic acellular oval bodies (surfactant derived lipoproteins) are basophilic on May-Grunwald-Giemsa staining and positive with PAS staining. The background is occupied by large amounts of amorphous debris showing weak PAS staining and a few foamy macrophages [21].

#### **7.2.2 Langerhans cell histiocytosis**

Pulmonary Langerhans cell histiocytosis is strongly associated with cigarette smoking, and the BAL differential shows the typical smoker's constellation with increased total cell counts and macrophages with smoker's inclusions. The specific finding is an increase in Langerhans cells to >4% of the total BAL cell count. The sensitivity is low because in late cases of the disease the number of Langerhans cells decrease in the tissue. Low proportions of Langerhans cells in the range of 2-4% can be seen in other conditions, such as in healthy smokers, respiratory bronchiolitis/interstitial lung disease (RB/ILD), other ILD and bronchioalveolar carcinoma [21]. The Langerhans cells can be easily identified in BAL by their staining with the monoclonal antibody for CD1a or Langerin [23]. The intracytoplasmic reaction with polyclonal antibody S100 is not as specific. As in alveolar proteinosis, electronic microscopy is not recommended as a routine diagnostic procedure.

#### **7.2.3 Diffuse alveolar haemorrhage**

Diffuse alveolar haemorrhage (DAH) is a clinical syndrome with widespread bleeding into the alveolar space as a result of multiple causes. The demonstration of numerous

Cigarette smoking is a strong confounding factor with significant effects on BAL samples. The alveolar macrophages from smokers show a 3 to 5 fold increase and characteristic morphology: many of them are much larger than those in nonsmokers and contain cytoplasmic inclusion bodies (smoker's inclusion bodies) consisting of tar products, lipids,

BAL is indicated in every patient with nuclear pulmonary shadowing or interstitial lung disease (ILD). BAL findings may be very specific, so that they can directly confirm a particular diagnosis. BAL should not be considered as a stand-alone diagnostic test and should be interpreted in the context of clinical, laboratory and radiographical high resolution computed tomography (HRCT) findings. It has been used in diagnostic and prognostic evaluation in diffuse parenchymal lung disease for three decades and has a central role in the diagnosis of a number of rare disorders and in excluding opportunistic infection in treated patients. It also has an important role in the diagnosis of many prevalent disorders, including sarcoidosis, hypersensitivity pneumonitis and idiopathic pulmonary

Pulmonary alveolar proteinosis is one of the few diseases in which BAL can confirm the diagnosis and replace lung biopsy. In pulmonary alveolar protienosis the BAL fluid is macroscopically milky and turbid. Under light microscopy the characteristic acellular oval bodies (surfactant derived lipoproteins) are basophilic on May-Grunwald-Giemsa staining and positive with PAS staining. The background is occupied by large amounts of

Pulmonary Langerhans cell histiocytosis is strongly associated with cigarette smoking, and the BAL differential shows the typical smoker's constellation with increased total cell counts and macrophages with smoker's inclusions. The specific finding is an increase in Langerhans cells to >4% of the total BAL cell count. The sensitivity is low because in late cases of the disease the number of Langerhans cells decrease in the tissue. Low proportions of Langerhans cells in the range of 2-4% can be seen in other conditions, such as in healthy smokers, respiratory bronchiolitis/interstitial lung disease (RB/ILD), other ILD and bronchioalveolar carcinoma [21]. The Langerhans cells can be easily identified in BAL by their staining with the monoclonal antibody for CD1a or Langerin [23]. The intracytoplasmic reaction with polyclonal antibody S100 is not as specific. As in alveolar proteinosis,

Diffuse alveolar haemorrhage (DAH) is a clinical syndrome with widespread bleeding into the alveolar space as a result of multiple causes. The demonstration of numerous

amorphous debris showing weak PAS staining and a few foamy macrophages [21].

electronic microscopy is not recommended as a routine diagnostic procedure.

lipofuscin and other substances (fig. 1b).

**7.2 Specific BAL findings in rare diseases** 

**7.2.1 Pulmonary alveolar proteinosis** 

**7.2.2 Langerhans cell histiocytosis** 

**7.2.3 Diffuse alveolar haemorrhage** 

fibrosis.

**7.1 BAL in the diagnosis of diffuse parenchymal lung disease** 

haemosiderin-laden macrophages on BAL cytology enables a diagnosis to be made even in cases with occult bleeding. In patients with fresh bleeding episodes free red blood cells in the fluid and fragments of ingested red blood cells within the cytoplasm of macrophages are pathognomonic.

To asses the severity of bleeding, the percentage of siderophages can easily be counted. It has been shown that a percentage of siderophages ≥20% is sufficient for a diagnosis of DAH.

Many syndromes belong to this group and other clinical and laboratory findings must be investigated to establish the cause of the bleeding. In the clinical setting, chronic left heart failure with pulmonary congestion is one of the most frequent underlying conditions for the finding of DAH in BAL fluid examination. Endogenous bleeding has to be differentiated from exogenous iron load of the lungs. Exogenous siderosis does not show roundish fragments of erythrocytes but irregular shaped dust particles engulfed by macrophages.

#### **7.2.4 Chronic aspiration**

In the differential diagnosis of recurrent pneumonia, gastro-oesophageal reflux with aspiration needs to be considered. The BAL cell differential may show a mixed pattern with increase in lymphocytes, neutrophils and eosinophils. The characteristic diagnostic finding is the presence of large numbers of lipid-laden macrophages and is highly suggestive of lipoid pneumonia caused by chronic aspiration.

#### **7.2.5 Pneumoconioses**

In ILD due to mineral dust exposure, BAL can confirm exposure by the detection of dust particles in alveolar macrophages. It is of two types:


#### **7.2.6 Eosinophilic lung disease**

Eosinophilic lung disease can be diagnosed when there are ≥25% eosinophils in BAL of the radiologically affected segment. In both acute and chronic eosinophilic pneumonia the

Role of Broncoalveolar Lavage in Diagnosis 65

patients show an increased CD4/CD8 ratio at the time of diagnosis. The ratio is even decreased to 1.0 in 15% of patients. The CD4/CD8 ratio is especially high in patients with Lofgren syndrome and acute sarcoidosis. Some studies have demonstrated an increased

This disease shows the highest total cell count and the highest lymphocyte count of all ILD's. The total cell yield is usually >20 million from a 100-mL BAL, with the proportion of lymphocytes exceeding 50%. The number of activated T-cells is also increased. The assessment of the CD4/CD8 ratio has produced contradictory findings. It is a general belief that the CD4/CD8 ratio is decreased. However, more recent studies have demonstrated that the ratio may be decreased, normal or increased [27, 28]. The alveolar macrophages are heterogeneous and often show a foamy cytoplasm. In acute episodes of extrinsic allergic alveolitis, the neutrophil count may increase transiently for approximately one week. A normal cell appearance or an isolated increase in neutrophil or eosinophil count widely

There are a large number of drugs which may induce an ILD, mediated by either toxic or immunological mechanisms (Table 2) [29]. Along with BAL lymphocytosis and/or granulocytosis, cytotoxic reactions with atypical type II pneumocytes or diffuse alveolar haemorrhage may be observed. The most frequent finding is lymphocytic alveolitis with a dominance of CD8+ T-cells. Methotrexate-induced pneumonitis may show an increase in CD4+ cells. Characteristic changes in amiodarone-induced pneumonitis are the presence of alveolar macrophages with a finely vacuolated foamy cytoplasm. These are also seen in patients without clinical signs of ILD. If no foamy macrophages are found, amiodaroneinduced pneumonitis can probably be excluded. The BAL findings described are not specific for drug-induced lung disease; therefore, additional assessment including tests like anti-

**8.4 Idiopathic pulmonary fibrosis and other idiopathic interstitial pneumonias** 

The typical BAL findings in idiopathic pulmonary fibrosis (IPF) is a moderately increased neutrophil count (10-30% of the total cells), with or without an increased eosinophil count. In total, 70–90% of the patients show an increased neutrophil count, while 40–60% shows an additionally increased eosinophil count. In 10–20% of the patients, a moderately increased

In nonspecific interstitial pneumonia (NSIP), a BAL lymphocytosis with a mild increase in the neutrophil and eosinophil count can be seen [30]. A BAL lymphocytosis is likely to be found more frequently in cellular NSIP than in fibrotic NSIP. The BAL findings in cellular NSIP appear to resemble those in bronchiolitis obliterans organizing pneumonia (BOOP).

In acute interstitial pneumonia the histological finding of diffuse alveolar damage shows an extremely unfavourable prognosis. The BAL fluid in acute interstitial pneumonia is mostly bloody and rich in albumin, indicating increased alveolar capillary permeability. The typical

neutrophil count in BAL obtained from newly diagnosed patients with sarcoidosis.

**8.2 Extrinsic allergic alveolitis** 

excludes extrinsic allergic alveolitis.

histone antibody is necessary to make the diagnosis.

lymphocyte count (proportion <30%) is seen .

**8.3 Drug induced pneumonitis** 

fraction of BAL eosinophils ranges from 20% to 90% and is higher than the neutrophil fraction. In this condition a mild-to-moderate increase in lymphocyte count with a decrease in CD4/CD8 ratio can be observed. In combination with clinical and HRCT findings, eosinophilic lung diseases can be appropriately diagnosed by BAL alone without an open lung biopsy [21].

#### **7.2.7 Opportunistic infections**

BAL has achieved the greatest diagnostic value among immunocompromised patients with pulmonary infiltrates. The sensitivity of BAL ranges from 60–90% in the diagnosis of bacterial infections, 70–80% in mycobacterial, fungal and most viral infections, and from 90– 95% in Pneumocystis carinii pneumonia. The characteristic cysts of Pneumocystis can be detected on May-Grunwald-Giemsa stained slides.

In cytomegalovirus pneumonia, the characteristic cytomegalic-transformed cell (the owl eye cell) with typical nuclear or cytoplasmic inclusions is highly specific and can be seen on light microscopy in 30–50% of cases.

#### **7.2.8 Malignancies**

BAL is not as sensitive for solid tumours as biopsy and cytology techniques. Diffuse malignant infiltrates can be reliably diagnosed in 60–90% of cases. The highest yield is seen in widespread malignancies, such as primary bronchoalveolar carcinoma or lymphangitic carcinomatosis due to adenocarcinoma. It can also provide diagnostic cytological material in haematological malignancies of the lung, including Hodgkin's disease, non-Hodgkin lymphoma, leukaemia, Waldenstrom's macroglobulinaemia, myeloma and mycosis fungoides. In malignant B-cell lymphoma the immunocytological demonstration of a monoclonal B-cell population, expressing only one immunoglobulin type and either kappa or lambda light chains, can confirm the diagnosis of malignancy [24, 25].

#### **8. BAL as an adjunct to diagnosis**

There are no specific BAL findings in the more common interstitial lung diseases. However, when BAL cellular analysis is considered in the context of clinical and HRCT findings it may contribute to narrowing the differential diagnosis and to avoiding open lung biopsy. BAL cellular patterns can generally differentiate the fibrosing conditions (characterised by neutrophilia and eosinophilia) from granulomatous diseases (lymphocytosis with or without granulocytosis).

#### **8.1 Sarcoidosis**

In sarcoidosis, BAL shows lymphocytic alveolitis in 90% of patients at the time of diagnosis, independent of the stage of sarcoidosis. It was shown that the patients with active sarcoidosis have a tendency to show higher lymphocyte counts than those with inactive sarcoidosis. However, in the late stage of sarcoidosis neutrophils may also be increased, as well as the number of mast cells. Patients with primary extrathoracic sarcoidosis may show typical findings of sarcoidosis on BAL even when imaging findings are normal [26]. The CD4/CD8 ratio also has high variability in sarcoidosis and approximately only 55% of

fraction of BAL eosinophils ranges from 20% to 90% and is higher than the neutrophil fraction. In this condition a mild-to-moderate increase in lymphocyte count with a decrease in CD4/CD8 ratio can be observed. In combination with clinical and HRCT findings, eosinophilic lung diseases can be appropriately diagnosed by BAL alone without an open

BAL has achieved the greatest diagnostic value among immunocompromised patients with pulmonary infiltrates. The sensitivity of BAL ranges from 60–90% in the diagnosis of bacterial infections, 70–80% in mycobacterial, fungal and most viral infections, and from 90– 95% in Pneumocystis carinii pneumonia. The characteristic cysts of Pneumocystis can be

In cytomegalovirus pneumonia, the characteristic cytomegalic-transformed cell (the owl eye cell) with typical nuclear or cytoplasmic inclusions is highly specific and can be seen on light

BAL is not as sensitive for solid tumours as biopsy and cytology techniques. Diffuse malignant infiltrates can be reliably diagnosed in 60–90% of cases. The highest yield is seen in widespread malignancies, such as primary bronchoalveolar carcinoma or lymphangitic carcinomatosis due to adenocarcinoma. It can also provide diagnostic cytological material in haematological malignancies of the lung, including Hodgkin's disease, non-Hodgkin lymphoma, leukaemia, Waldenstrom's macroglobulinaemia, myeloma and mycosis fungoides. In malignant B-cell lymphoma the immunocytological demonstration of a monoclonal B-cell population, expressing only one immunoglobulin type and either kappa

There are no specific BAL findings in the more common interstitial lung diseases. However, when BAL cellular analysis is considered in the context of clinical and HRCT findings it may contribute to narrowing the differential diagnosis and to avoiding open lung biopsy. BAL cellular patterns can generally differentiate the fibrosing conditions (characterised by neutrophilia and eosinophilia) from granulomatous diseases (lymphocytosis with or

In sarcoidosis, BAL shows lymphocytic alveolitis in 90% of patients at the time of diagnosis, independent of the stage of sarcoidosis. It was shown that the patients with active sarcoidosis have a tendency to show higher lymphocyte counts than those with inactive sarcoidosis. However, in the late stage of sarcoidosis neutrophils may also be increased, as well as the number of mast cells. Patients with primary extrathoracic sarcoidosis may show typical findings of sarcoidosis on BAL even when imaging findings are normal [26]. The CD4/CD8 ratio also has high variability in sarcoidosis and approximately only 55% of

or lambda light chains, can confirm the diagnosis of malignancy [24, 25].

lung biopsy [21].

**7.2.7 Opportunistic infections** 

microscopy in 30–50% of cases.

**8. BAL as an adjunct to diagnosis** 

without granulocytosis).

**8.1 Sarcoidosis** 

**7.2.8 Malignancies** 

detected on May-Grunwald-Giemsa stained slides.

patients show an increased CD4/CD8 ratio at the time of diagnosis. The ratio is even decreased to 1.0 in 15% of patients. The CD4/CD8 ratio is especially high in patients with Lofgren syndrome and acute sarcoidosis. Some studies have demonstrated an increased neutrophil count in BAL obtained from newly diagnosed patients with sarcoidosis.

#### **8.2 Extrinsic allergic alveolitis**

This disease shows the highest total cell count and the highest lymphocyte count of all ILD's. The total cell yield is usually >20 million from a 100-mL BAL, with the proportion of lymphocytes exceeding 50%. The number of activated T-cells is also increased. The assessment of the CD4/CD8 ratio has produced contradictory findings. It is a general belief that the CD4/CD8 ratio is decreased. However, more recent studies have demonstrated that the ratio may be decreased, normal or increased [27, 28]. The alveolar macrophages are heterogeneous and often show a foamy cytoplasm. In acute episodes of extrinsic allergic alveolitis, the neutrophil count may increase transiently for approximately one week. A normal cell appearance or an isolated increase in neutrophil or eosinophil count widely excludes extrinsic allergic alveolitis.

#### **8.3 Drug induced pneumonitis**

There are a large number of drugs which may induce an ILD, mediated by either toxic or immunological mechanisms (Table 2) [29]. Along with BAL lymphocytosis and/or granulocytosis, cytotoxic reactions with atypical type II pneumocytes or diffuse alveolar haemorrhage may be observed. The most frequent finding is lymphocytic alveolitis with a dominance of CD8+ T-cells. Methotrexate-induced pneumonitis may show an increase in CD4+ cells. Characteristic changes in amiodarone-induced pneumonitis are the presence of alveolar macrophages with a finely vacuolated foamy cytoplasm. These are also seen in patients without clinical signs of ILD. If no foamy macrophages are found, amiodaroneinduced pneumonitis can probably be excluded. The BAL findings described are not specific for drug-induced lung disease; therefore, additional assessment including tests like antihistone antibody is necessary to make the diagnosis.

#### **8.4 Idiopathic pulmonary fibrosis and other idiopathic interstitial pneumonias**

The typical BAL findings in idiopathic pulmonary fibrosis (IPF) is a moderately increased neutrophil count (10-30% of the total cells), with or without an increased eosinophil count. In total, 70–90% of the patients show an increased neutrophil count, while 40–60% shows an additionally increased eosinophil count. In 10–20% of the patients, a moderately increased lymphocyte count (proportion <30%) is seen .

In nonspecific interstitial pneumonia (NSIP), a BAL lymphocytosis with a mild increase in the neutrophil and eosinophil count can be seen [30]. A BAL lymphocytosis is likely to be found more frequently in cellular NSIP than in fibrotic NSIP. The BAL findings in cellular NSIP appear to resemble those in bronchiolitis obliterans organizing pneumonia (BOOP).

In acute interstitial pneumonia the histological finding of diffuse alveolar damage shows an extremely unfavourable prognosis. The BAL fluid in acute interstitial pneumonia is mostly bloody and rich in albumin, indicating increased alveolar capillary permeability. The typical

Role of Broncoalveolar Lavage in Diagnosis 67

interstitial pneumonia pattern, but many of the cases of CVD-associated pulmonary fibrosis show a pattern that is in the category of NSIP, based on a computed tomography scan or histology [26]. The BAL findings are also somewhat different from IPF. The general pattern is increased neutrophils, with or without eosinophils, but increased lymphocytes are more commonly seen than in IPF [31]. In general, BAL seems to have a limited value in the diagnosis of CVD affecting the lungs because the BAL profile is very nonspecific. However, BAL may be useful in detecting other pulmonary problems that may arise in these disorders, including drug induced toxicity, infection, pulmonary haemorrhage associated with vasculitis and malignancy. The NSIP pattern was the more prevalent pattern. It has previously been shown that increased BAL neutrophils were associated with more extensive changes on HRCT. An abnormal BAL may be the first evidence of pulmonary involvement in CVD. If radiographic signs are absent and pulmonary function tests are normal, this abnormal finding indicates subclinical alveolitis. It is still not clear whether such subclinical alveolitis needs treatment. It is also not clear whether the pattern of BAL cells (increase in neutrophils or lymphocytes) in a

It is unclear whether BAL cellularity is useful for assessing the activity of disease processes with respect to obtaining prognostic information. In sarcoidosis, differences were observed for several BAL parameters between clinically active and inactive patient groups, but without predicting long-term outcome in individual patients. It is not proven that BAL or serial BAL is useful to guide therapy or predict treatment response. At present, BAL cannot

The discovery of new signal pathways and biomarkers between cells and the application of proteomics, gene arrays and metabolomics has contributed many important insights into the pathogenesis of respiratory tract diseases. BAL has been profiled as a fundamental method to obtaining alveolar space and airway specimens for research, and this could lead to more clear-cut longitudinal monitoring of ILD in the future. For example, KL-6, a high-molecular weight glycoprotein predominantly expressed on the surface of alveolar type II cells, is a promising biomarker in the field of ILD. Increased levels of KL-6 in BAL fluid and plasma correlate with the severity of alveolar inflammation and poor survival in acute respiratory distress syndrome [33]. Increased levels of KL-6 in both BAL fluid and blood, with a strong correlation between BAL and blood, also reflect disease severity in patients with idiopathic pulmonary alveolar proteinosis [34]. BAL is suitable for studying the cellular and biological changes induced by drugs. In this view, BAL can be used for concept studies in the clinical

Bronchoalveolar lavage is an easily performed and well tolerated procedure able to provide

cellular contents, cellular products, and proteins from the lower respiratory tract.

setting of subclinical alveolitis reflects the prognosis [32].

be routinely recommended for this purpose.

development of new drugs.

**11. Conclusion** 

**9. Role of BAL in the prognosis and activity of disease** 

**10. Role of BAL in research and development of new drugs** 


Table 2. Bronchoalveolar lavage findings in drug-induced interstitial lung disease

cellular BAL finding is a marked increase in neutrophils and an occasional increase in lymphocytes. Atypical pneumocytes mimicking adenocarcinoma and fragmented hyaline membranes may also be observed [25]. The typical BAL findings in desquamative interstitial pneumonia and RB/ILD are an increase in macrophages with black pigmented inclusions. In this an increase in neutrophils, eosinophils and, occasionally, lymphocytes may also be seen. Idiopathic lymphocytic interstitial pneumonia is rare and is usually associated with collagen vascular diseases, Sjogren's syndrome or lymphoma. The typical BAL finding in lymphocytic interstitial pneumonia is lymphocytosis and CD4/CD8 ratio shows diverse alterations.

#### **8.5 Collagen vascular disease**

In collagen vascular diseases (CVD), pulmonary involvement can be associated with various histopathological patterns. The pathology may be similar to IPF with a usual

Lymphocytosis Eosinophilia Neutrophilia Cytotoxic reaction Haemorrhage

Cyclophosphamide Cotrimazole Amiodarone Nitrosoureas Cytotoxic drugs

Busulfan Sulfasalazine Cyclophosphamide

Table 2. Bronchoalveolar lavage findings in drug-induced interstitial lung disease

cellular BAL finding is a marked increase in neutrophils and an occasional increase in lymphocytes. Atypical pneumocytes mimicking adenocarcinoma and fragmented hyaline membranes may also be observed [25]. The typical BAL findings in desquamative interstitial pneumonia and RB/ILD are an increase in macrophages with black pigmented inclusions. In this an increase in neutrophils, eosinophils and, occasionally, lymphocytes may also be seen. Idiopathic lymphocytic interstitial pneumonia is rare and is usually associated with collagen vascular diseases, Sjogren's syndrome or lymphoma. The typical BAL finding in lymphocytic interstitial pneumonia is lymphocytosis and CD4/CD8 ratio shows diverse

In collagen vascular diseases (CVD), pulmonary involvement can be associated with various histopathological patterns. The pathology may be similar to IPF with a usual

Bleomycin Penicillin Busulfan

Vincristine Ampicillin Nitrofurantoin Tetracycline Minocycline Maloprim

Gold Minocycline

Sulfasalazine L-Tryptophan

Amiodarone Acebutolol Atenolol Celiprolol Propranolol Flecainide

Diphenylhydantoin

**8.5 Collagen vascular disease** 

Nilutamide

alterations.

Methotrexate Bleomycin Bleomycin Bleomycin D-Penicillamine Azathioprine Nitrofurantoin Minocycline Methotrexate Amphotericin B interstitial pneumonia pattern, but many of the cases of CVD-associated pulmonary fibrosis show a pattern that is in the category of NSIP, based on a computed tomography scan or histology [26]. The BAL findings are also somewhat different from IPF. The general pattern is increased neutrophils, with or without eosinophils, but increased lymphocytes are more commonly seen than in IPF [31]. In general, BAL seems to have a limited value in the diagnosis of CVD affecting the lungs because the BAL profile is very nonspecific. However, BAL may be useful in detecting other pulmonary problems that may arise in these disorders, including drug induced toxicity, infection, pulmonary haemorrhage associated with vasculitis and malignancy. The NSIP pattern was the more prevalent pattern. It has previously been shown that increased BAL neutrophils were associated with more extensive changes on HRCT. An abnormal BAL may be the first evidence of pulmonary involvement in CVD. If radiographic signs are absent and pulmonary function tests are normal, this abnormal finding indicates subclinical alveolitis. It is still not clear whether such subclinical alveolitis needs treatment. It is also not clear whether the pattern of BAL cells (increase in neutrophils or lymphocytes) in a setting of subclinical alveolitis reflects the prognosis [32].

#### **9. Role of BAL in the prognosis and activity of disease**

It is unclear whether BAL cellularity is useful for assessing the activity of disease processes with respect to obtaining prognostic information. In sarcoidosis, differences were observed for several BAL parameters between clinically active and inactive patient groups, but without predicting long-term outcome in individual patients. It is not proven that BAL or serial BAL is useful to guide therapy or predict treatment response. At present, BAL cannot be routinely recommended for this purpose.

#### **10. Role of BAL in research and development of new drugs**

The discovery of new signal pathways and biomarkers between cells and the application of proteomics, gene arrays and metabolomics has contributed many important insights into the pathogenesis of respiratory tract diseases. BAL has been profiled as a fundamental method to obtaining alveolar space and airway specimens for research, and this could lead to more clear-cut longitudinal monitoring of ILD in the future. For example, KL-6, a high-molecular weight glycoprotein predominantly expressed on the surface of alveolar type II cells, is a promising biomarker in the field of ILD. Increased levels of KL-6 in BAL fluid and plasma correlate with the severity of alveolar inflammation and poor survival in acute respiratory distress syndrome [33]. Increased levels of KL-6 in both BAL fluid and blood, with a strong correlation between BAL and blood, also reflect disease severity in patients with idiopathic pulmonary alveolar proteinosis [34]. BAL is suitable for studying the cellular and biological changes induced by drugs. In this view, BAL can be used for concept studies in the clinical development of new drugs.

#### **11. Conclusion**

Bronchoalveolar lavage is an easily performed and well tolerated procedure able to provide cellular contents, cellular products, and proteins from the lower respiratory tract.

Role of Broncoalveolar Lavage in Diagnosis 69

[16] Klech H, Hutter C. Clinical guidelines and indications for bronchoalveolar lavage

[17] Bronchoalveolar lavage constituents in healthy individuals, idiopathic pulmonary

[19] Costabel U., Guzman J. Bronchoalveolar lavage. In: Gibson GJ, Geddes DM, Costabel U,

[20] Harbeck RJ. Immunophenotyping of bronchoalveolar lavage lymphocytes. Clin Diagn

[21] Costabel U, Guzman J, Bonella F, et al. Bronchoalveolar lavage in other interstitial lung

[22] Bonella F, Ohshimo S, Bauer P, Guzman J, Costabel U. Bronchoalveolar lavage. Eur

[23] Smetana K Jr, Mericka O, Saeland S, et al. Diagnostic relevance of Langerin detection in

[24] Costabel U, Bross KJ, Matthys H. Diagnosis by bronchoalveolar lavage of cause of pulmonary infiltrates in haematological malignancies. BMJ 1985; 290: 1041. [25] Poletti V, Poletti G, Murer B, et al. Bronchoalveolar lavage in malignancy. Semin Respir

[26] Drent M, Mansour K, Linssen C. Bronchoalveolar lavage in sarcoidosis. Semin Respir

[27] Barrera L, Mendoza F, Zuniga J, et al. Functional diversity of T-cell subpopulations in

[28] Ye Q, Nakamura S, Sarria R, et al. Interleukin 12, interleukin 18, and tumor necrosis

[29] Costabel U, Uzaslan E, Guzman J. Bronchoalveolar lavage in drug-induced lung

[30] Ryu YU, Chung MP, Han J, et al. Bronchoalveolar lavage in fibrotic idiopathic

[31] Nagao T, Nagai S, Kitaichi M, et al. Usual interstitial pneumonia: idiopathic pulmonary fibrosis versus collagen vascular diseases. Respiration 2001; 68: 151–159. [32] Goh NS, Veeraraghavan S, Desai SR, et al. Bronchoalveolar lavage cellular profiles in

predictive of disease progression. Arthritis Rheum 2007; 56: 2005–2012. [33] Nathani N, Perkins GD, Tunnicliffe W, et al. Kerbs von Lungren 6 antigen is a marker of

pneumonitis. Ann Allergy Asthma Immunol 2009; 102: 149–154.

interstitial pneumonias. Respir Med 2007; 101: 655–660.

sub-acute and chronic hypersensitivity pneumonitis. Am J Respir Crit Care Med

factor alpha release by alveolar macrophages: acute and chronic hypersensitivity

patients with systemic sclerosis-associated interstitial lung disease are not

alveolar inflammation but not of infection in patients with acute respiratory

cells from bronchoalveolar lavage of patients with pulmonary Langerhans cell histiocytosis, sarcoidosis and idiopathic pulmonary fibrosis. Virchows Arch 2004;

Committee. Am Rev Respir Dis 1990; 141: S169–S202.

diseases. Semin Respir Crit Care Med. 2007; 28: 514–524.

[18] Costabel U, eds. Atlas der bronchoalveola¨ren Lavage. Stuttgart, Thieme, 1994.

Respir J 1990; 3: 937–974.

Lab Immunol 1998; 5: 271–277.

Respir Mon, 2010, 48, 59–72.

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distress syndrome. Crit Care 2008; 12: R12.

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fibrosis, and selected comparison groups. The BAL Cooperative Group Steering

et al., eds. Respiratory Medicine. 3rd Edn. London, WB Saunders, 2003; pp. 438–

In the rapidly evolving field of pulmonary diagnostic tests, BAL has a specific value for the diagnosis of certain ILD's, such as alveolar proteinosis, Pneumocystis pneumonia, bronchoalveolar carcinoma, malignant non-Hodgkin lymphoma and alveolar haemorrhage, allowing surgical lung biopsy to be avoided. In other ILD's, BAL findings may be able, in combination with clinical and HRCT findings, to strengthen or weaken a suspected diagnosis. This method is also valid support for research. Genetic and molecular biomarkers, with different diagnostic/prognostic significance, can be detected in BAL.

#### **12. References**


In the rapidly evolving field of pulmonary diagnostic tests, BAL has a specific value for the diagnosis of certain ILD's, such as alveolar proteinosis, Pneumocystis pneumonia, bronchoalveolar carcinoma, malignant non-Hodgkin lymphoma and alveolar haemorrhage, allowing surgical lung biopsy to be avoided. In other ILD's, BAL findings may be able, in combination with clinical and HRCT findings, to strengthen or weaken a suspected diagnosis. This method is also valid support for research. Genetic and molecular biomarkers, with different diagnostic/prognostic significance, can be detected

[2] Klech H, Hutter C. Clinical guidelines and indications for bronchoalveolar lavage (BAL).

[3] Rogers RM, Braunstein MS, Shurman JF. Role of bronchopulmonary lavage in the treatment of respiratory failure: a review. Chest. 1972; 62: Suppl: 95S-106. [4] Goldstein RA, Rohatgi PK, Bergofsky EH, Block ER, Daniele RP, Dantzker DR, Davis

[5] Klech H, Hutter C. Side-effects and safety of BAL. Eur Respir J. 1990; 3:939-40, 961-9. [6] Drent M, Baughman RP, Meyer P. Bronchoalveolar Lavage. In: Costabel U, DuBois R, Egan J, editors. Diffuse Parenchymal Lung Disease. Basel: Karger; 2007. [7] Reynolds HY. Use of bronchoalveolar lavage in humans--past necessity and future

[8] Park DR. The microbiology of ventilator-associated pneumonia. Respir Care.

[10] Meduri GU, Chastre J. The standardization of bronchoscopic techniques for ventilator-

[11] Haslam PL, Baughman RP. ERS task force report on a-cellular components in BAL. Eur

[12] Pingleton SK, Harrison GF, Stechschulte DJ, Wesselius LJ, Kerby GR, Ruth WE. Effect of

[13] Costabel U, Guzman J. Bronchoalveolar lavage in interstitial lung disease. Curr Opin

[14] Lam S, Leriche JC, Kijek K, et al. Effect of bronchial lavage volume on cellular and

[15] Klech H, Pohl W. Technical recommendations and guidelines for bronchoalveolar

location, pH, and temperature of instillate in bronchoalveolar lavage in normal

lavage (BAL). Report of the European Society of Pneumology Task Group. Eur

[9] Reynolds HY. Bronchoalveolar lavage. Am Rev Respir Dis. 1987;135:250-63.

associated pneumonia. Chest 1992;102 (5 Suppl 1):557S-64S.

volunteers. Am Rev Respir Dis. 1983;128:1035-7.

protein recovery. Chest 1985; 88: 856–859.

Report of the European Society of Pneumonology Task Group on BAL. Eur Respir J

GS, Hunninghake GW, King TE Jr, Metzger WJ, et al. Clinical role of bronchoalveolar lavage in adults with pulmonary disease. Am Rev Respir Dis.

[1] Rankin, J. A. 1988. Pulmonary immunology. Clin. Chest Med. 9:387–393.

in BAL.

**12. References** 

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2005;50(6):742-63; discussion 763-5.

Respir Rev 1999;9:25-7.

Pulm Med. 2001;7:255-61.

Respir J 1989; 2: 561–585.


**4** 

*Portugal* 

**Lung Cancer – CT Vs Bronchoscopy** 

*Escola Superior de Tecnologia da Saúde de Coimbra (ESTeSC), Coimbra* 

During the recent years was possible to witness significant changes in the incidence and types of lung pathology seen by clinicians. It is important to mention that lung pathologies

Lung cancer was a rare disease in the early 1900s, but has since become far more prevalent and this lung pathology remains one of the greatest medical challenges with nearly 1.5 million cases worldwide each year and is the most common cause of cancer death in the world (Harewood GC et al., 2002) and (Spiro SG et al., 2010). It is typically a disease of elderly patients, with a peak incidence at around 70-80 years of age (Chen YM et al., 2009). The incidence and mortality of lung cancer have increased sharply during this century, making it a common cause of death and the most frequent fatal cancer in men and women (Beckett WS, 1993). Clearly, lung cancer is an important and widespread disease that

From all malignant tumors, except for non-melanoma skin cancer, lung cancer is the second most common type among men and the most frequent among women. The most concerning characteristics of this kind of cancer is that it has caused more deaths that the sum of the deaths caused by prostate, breast and rectal cancer in developed countries (Silva AC et al.,

Smoking is estimated to be the cause of 85% of lung cancer deaths (Agarwal A et al., 2003). It is important to remind that the consumption of tobacco is not the only cause of this malignant tumor. Other factors are associated, affecting the incidence of this disease: exposure to arsenic, chromium, nickel and asbestos, cicatricial lesions of tuberculosis, and

Studies in molecular biology have elucidated the role that genetic factors play in modifying an individual's risk for lung cancer. Although chemopreventive agents may be developed to prevent lung cancer, prevention of smoking initiation and promotion of smoking cessation

This malignant pathology, like most other solid tumors, is usually recognized late in its natural history. The five-year mortality from the time of presentation remains at approximately 85 to 90% and more than 90% of the patients with lung cancer will be

familiar history of lung cancer (Beckett WS, 1993) and (Figueiredo L et al., 1999).

are currently the best weapons to fight lung cancer (Bilello Ks et al., 2002).

symptomatic at presentation (Beckles MA et al., 2003).

are some of the most common medical conditions worldwide.

constitutes a major public health problem (Witschi H, 2001).

**1. Introduction** 

2011).

António Saraiva and Christopher Oliveira

[34] Lin FC, Chen YC, Chang SC. Clinical importance of bronchoalveolar lavage fluid and blood cytokines, surfactant protein D, and Kerbs von Lungren 6 antigen in idiopathic pulmonary alveolar proteinosis. Mayo Clin Proc 2008; 83: 1344–1349.

## **Lung Cancer – CT Vs Bronchoscopy**

António Saraiva and Christopher Oliveira

*Escola Superior de Tecnologia da Saúde de Coimbra (ESTeSC), Coimbra Portugal* 

#### **1. Introduction**

70 Global Perspectives on Bronchoscopy

[34] Lin FC, Chen YC, Chang SC. Clinical importance of bronchoalveolar lavage fluid and

blood cytokines, surfactant protein D, and Kerbs von Lungren 6 antigen in idiopathic pulmonary alveolar proteinosis. Mayo Clin Proc 2008; 83: 1344–1349.

> During the recent years was possible to witness significant changes in the incidence and types of lung pathology seen by clinicians. It is important to mention that lung pathologies are some of the most common medical conditions worldwide.

> Lung cancer was a rare disease in the early 1900s, but has since become far more prevalent and this lung pathology remains one of the greatest medical challenges with nearly 1.5 million cases worldwide each year and is the most common cause of cancer death in the world (Harewood GC et al., 2002) and (Spiro SG et al., 2010). It is typically a disease of elderly patients, with a peak incidence at around 70-80 years of age (Chen YM et al., 2009).

> The incidence and mortality of lung cancer have increased sharply during this century, making it a common cause of death and the most frequent fatal cancer in men and women (Beckett WS, 1993). Clearly, lung cancer is an important and widespread disease that constitutes a major public health problem (Witschi H, 2001).

> From all malignant tumors, except for non-melanoma skin cancer, lung cancer is the second most common type among men and the most frequent among women. The most concerning characteristics of this kind of cancer is that it has caused more deaths that the sum of the deaths caused by prostate, breast and rectal cancer in developed countries (Silva AC et al., 2011).

> Smoking is estimated to be the cause of 85% of lung cancer deaths (Agarwal A et al., 2003). It is important to remind that the consumption of tobacco is not the only cause of this malignant tumor. Other factors are associated, affecting the incidence of this disease: exposure to arsenic, chromium, nickel and asbestos, cicatricial lesions of tuberculosis, and familiar history of lung cancer (Beckett WS, 1993) and (Figueiredo L et al., 1999).

> Studies in molecular biology have elucidated the role that genetic factors play in modifying an individual's risk for lung cancer. Although chemopreventive agents may be developed to prevent lung cancer, prevention of smoking initiation and promotion of smoking cessation are currently the best weapons to fight lung cancer (Bilello Ks et al., 2002).

> This malignant pathology, like most other solid tumors, is usually recognized late in its natural history. The five-year mortality from the time of presentation remains at approximately 85 to 90% and more than 90% of the patients with lung cancer will be symptomatic at presentation (Beckles MA et al., 2003).

Lung Cancer – CT Vs Bronchoscopy 73

The main histological types of this malignant disease include: adenocarcinoma, squamous cell carcinoma, SCLC and large-cell carcinoma. Adenocarcinoma accounts for 25 to 30% of NSCLC and is the most common histological type. It is typically classified as acinar, papillary, solid, and bronchioloalveolar varieties (Beckles MA et al., 2003) and (Patz EF Jr, 2000). The incidence of adenocarcinoma has increased in recent decades, while the incidence of squamous cell carcinoma has reached a plateau or has decreased (Chen YM et al., 2009). A variety of techniques are available as methods of achieving a definitive diagnosis. The diagnostic evaluation of this disease has two main objectives: the definition of the pathological type of the tumor and staging of the disease (Westeel V, 2003). A diagnosis should be obtained by whatever method is easiest in patients who are presumed to have SCLC or who have very clear evidence of advanced NSCLC (*e.g.*, a large pleural effusion or metastatic disease). The most appropriate test is usually determined by the type of lung cancer (SCLC or NSCLC), the size and location of the tumor, and the presumed stage of the

The available tools for diagnosing and staging lung cancer patients can be broadly categorized into non-invasive, minimally invasive and invasive (surgical) modalities (Hicks

Current imaging for lung cancer makes use of chest radiographs, Computed Tomography (CT), Magnetic Resonance Imaging (MRI), and nuclear medicine. Most studies are designed to detect anatomic abnormalities, leading to some problems in sensitivity and especially specificity. In the future, imaging may be directed more at tumor biology, and perhaps then

Although histology diagnosis is the most accurate detection method in the medical environment, it is an aggressive invasive procedure that involves risks, discomfort and

A person who is at high-risk for lung cancer and asymptomatic, and who is interested in potentially being screened should be fully apprised of the implications of screening and of the treatment that may result. It is fulcral to mention that the value of screening for early disease is not yet established and trials to see if mortality can be improved as a result are in

It is important to refer that most symptomatic lung cancer is discovered at advanced stages, with the goal of long-term survival entirely dependent on effective treatment of stage III and

More accurate staging at the time of initial presentation could improve design of clinical trials and avoid inappropriate surgical decisions in individual patients (Roberts JR et al., 1999). The TNM classification system for the staging of lung cancer has led to important advances in the determination of prognosis and treatment of patients with this disease (McLoud TC, 2006). TNM-staging has important influence on prognosis and therapy (Serke

This system takes into account the degree of spread of the primary tumor (represented by T); the extent of regional lymph node involvement (represented by N); and the presence or absence of distant metastases (represented by M). The TNM system is used for all lung

will have a greater impact on this devastating disease (Patz EF Jr, 2000).

progress (Henschke CI et al., 2007) and (Spiro SG et al., 2010).

trauma, which restrict it to be used in the clinical practice (Xiuhua G et al., 2011).

cancer (Brundage MD et al., 2002).

IV lung cancer (Wang T et al., 2010).

M & Schönfeld N, 2007).

RJ et al., 2007).

Most patients with lung cancer present to the clinician in a fairly advanced stage and at best only 25-30% of patients can be offered curative resection (Kamath AV et al., 2006). A minority present with symptoms related to the primary tumor, and most patients present with either nonspecific systemic symptoms, including anorexia, weight loss and fatigue, or specific symptoms indicating metastatic disease (Beckles MA et al., 2003).

One of the causes of the low survival rate from lung cancer is related to difficulty of its precocious diagnosis due to the absence of symptoms and to the poor diagnosis at more advanced stages of the disease (Jamnik S et al., 2002). Prognosis is related to the type of presenting symptoms (Beckles MA et al., 2003).

Patients with lung cancer have a five-year survival rate varying from 13% to 21% in developed countries and varying from 7% to 10% in emerging countries (Silva AC et al., 2011).

However, when lung cancer is found at the early stage I or II, five-year survival rates can be as high as 60-70% (Beadsmoore CJ & Screaton NJ, 2003). The best survival rates are found in the subgroup of patients with lung cancer with surgically resectable tumors. Clinicians, therefore, are vitally interested in recognizing lung cancer early and determining surgical resectability accurately (Colice Gl, 1994).

Symptoms, signs and abnormalities in laboratory tests relating to the lung cancer can be classified as follows: those related to the primary lesion, those related to intrathoracic spread, those related to distant metastasis, and those related to paraneoplastic syndromes (Beckles MA et al., 2003).

Lung cancer is routinely classified as Small Cell Lung Cancer (SCLC) or Non Small Cell Lung Cancer (NSCLC) on the basis of distinctive pathological and molecular features but also for appropriate therapeutic management (Scagliotti GV et al., 2009). The distinction between SCLC and NSCLC came into proeminence when it was realized that SCLC was characterized by widespread metastatic spread at diagnosis and often displayed partial or complete response to conventional cytotoxic therapies (Gazdar AF, 2010).

The NSCLC category encompasses several subtypes having different morphological features generally treated according to similar strategies, so that a clear cut distinction among these types was not considered mandatory and accounts for 80% to 85% of lung carcinoma and determining the prognosis for an individual patient with NSCLC is difficult, in part because of the marked clinical heterogeneity of patients with the disease. Patients with early stage NSCLC have relatively high long-term survival rates after surgical resection, but a substantial majority of patients, approximately 80%, present in advanced stages (Scagliotti GV et al., 2009) and (Wang T et al., 2010).

SCLC is associated with poor diagnosis, with an average two-year survival rate of less than 10%. Patients are usually symptomatic at diagnosis, 30% to 40% report dyspnea and chest pain. Only 4% to 5% of SCLC cases are detected as solitary pulmonary nodule. Therefore, SCLC differs markedly from NSCLC in biologic behavior and clinical behavior. SCLC it is associated with rapid growth, and almost two-thirds of patients have metastatic disease at presentation. The response to the initial phase of the treatment is usually good, with almost 80% of the patients showing a major response (Argiris A & Murren JR, 2001) and (Oliveira C & Saraiva A, 2010).

Most patients with lung cancer present to the clinician in a fairly advanced stage and at best only 25-30% of patients can be offered curative resection (Kamath AV et al., 2006). A minority present with symptoms related to the primary tumor, and most patients present with either nonspecific systemic symptoms, including anorexia, weight loss and fatigue, or

One of the causes of the low survival rate from lung cancer is related to difficulty of its precocious diagnosis due to the absence of symptoms and to the poor diagnosis at more advanced stages of the disease (Jamnik S et al., 2002). Prognosis is related to the type of

Patients with lung cancer have a five-year survival rate varying from 13% to 21% in developed countries and varying from 7% to 10% in emerging countries (Silva AC et al.,

However, when lung cancer is found at the early stage I or II, five-year survival rates can be as high as 60-70% (Beadsmoore CJ & Screaton NJ, 2003). The best survival rates are found in the subgroup of patients with lung cancer with surgically resectable tumors. Clinicians, therefore, are vitally interested in recognizing lung cancer early and determining surgical

Symptoms, signs and abnormalities in laboratory tests relating to the lung cancer can be classified as follows: those related to the primary lesion, those related to intrathoracic spread, those related to distant metastasis, and those related to paraneoplastic syndromes

Lung cancer is routinely classified as Small Cell Lung Cancer (SCLC) or Non Small Cell Lung Cancer (NSCLC) on the basis of distinctive pathological and molecular features but also for appropriate therapeutic management (Scagliotti GV et al., 2009). The distinction between SCLC and NSCLC came into proeminence when it was realized that SCLC was characterized by widespread metastatic spread at diagnosis and often displayed partial or

The NSCLC category encompasses several subtypes having different morphological features generally treated according to similar strategies, so that a clear cut distinction among these types was not considered mandatory and accounts for 80% to 85% of lung carcinoma and determining the prognosis for an individual patient with NSCLC is difficult, in part because of the marked clinical heterogeneity of patients with the disease. Patients with early stage NSCLC have relatively high long-term survival rates after surgical resection, but a substantial majority of patients, approximately 80%, present in advanced stages (Scagliotti

SCLC is associated with poor diagnosis, with an average two-year survival rate of less than 10%. Patients are usually symptomatic at diagnosis, 30% to 40% report dyspnea and chest pain. Only 4% to 5% of SCLC cases are detected as solitary pulmonary nodule. Therefore, SCLC differs markedly from NSCLC in biologic behavior and clinical behavior. SCLC it is associated with rapid growth, and almost two-thirds of patients have metastatic disease at presentation. The response to the initial phase of the treatment is usually good, with almost 80% of the patients showing a major response (Argiris A & Murren JR, 2001) and (Oliveira C

complete response to conventional cytotoxic therapies (Gazdar AF, 2010).

specific symptoms indicating metastatic disease (Beckles MA et al., 2003).

presenting symptoms (Beckles MA et al., 2003).

resectability accurately (Colice Gl, 1994).

GV et al., 2009) and (Wang T et al., 2010).

& Saraiva A, 2010).

(Beckles MA et al., 2003).

2011).

The main histological types of this malignant disease include: adenocarcinoma, squamous cell carcinoma, SCLC and large-cell carcinoma. Adenocarcinoma accounts for 25 to 30% of NSCLC and is the most common histological type. It is typically classified as acinar, papillary, solid, and bronchioloalveolar varieties (Beckles MA et al., 2003) and (Patz EF Jr, 2000). The incidence of adenocarcinoma has increased in recent decades, while the incidence of squamous cell carcinoma has reached a plateau or has decreased (Chen YM et al., 2009).

A variety of techniques are available as methods of achieving a definitive diagnosis. The diagnostic evaluation of this disease has two main objectives: the definition of the pathological type of the tumor and staging of the disease (Westeel V, 2003). A diagnosis should be obtained by whatever method is easiest in patients who are presumed to have SCLC or who have very clear evidence of advanced NSCLC (*e.g.*, a large pleural effusion or metastatic disease). The most appropriate test is usually determined by the type of lung cancer (SCLC or NSCLC), the size and location of the tumor, and the presumed stage of the cancer (Brundage MD et al., 2002).

The available tools for diagnosing and staging lung cancer patients can be broadly categorized into non-invasive, minimally invasive and invasive (surgical) modalities (Hicks RJ et al., 2007).

Current imaging for lung cancer makes use of chest radiographs, Computed Tomography (CT), Magnetic Resonance Imaging (MRI), and nuclear medicine. Most studies are designed to detect anatomic abnormalities, leading to some problems in sensitivity and especially specificity. In the future, imaging may be directed more at tumor biology, and perhaps then will have a greater impact on this devastating disease (Patz EF Jr, 2000).

Although histology diagnosis is the most accurate detection method in the medical environment, it is an aggressive invasive procedure that involves risks, discomfort and trauma, which restrict it to be used in the clinical practice (Xiuhua G et al., 2011).

A person who is at high-risk for lung cancer and asymptomatic, and who is interested in potentially being screened should be fully apprised of the implications of screening and of the treatment that may result. It is fulcral to mention that the value of screening for early disease is not yet established and trials to see if mortality can be improved as a result are in progress (Henschke CI et al., 2007) and (Spiro SG et al., 2010).

It is important to refer that most symptomatic lung cancer is discovered at advanced stages, with the goal of long-term survival entirely dependent on effective treatment of stage III and IV lung cancer (Wang T et al., 2010).

More accurate staging at the time of initial presentation could improve design of clinical trials and avoid inappropriate surgical decisions in individual patients (Roberts JR et al., 1999). The TNM classification system for the staging of lung cancer has led to important advances in the determination of prognosis and treatment of patients with this disease (McLoud TC, 2006). TNM-staging has important influence on prognosis and therapy (Serke M & Schönfeld N, 2007).

This system takes into account the degree of spread of the primary tumor (represented by T); the extent of regional lymph node involvement (represented by N); and the presence or absence of distant metastases (represented by M). The TNM system is used for all lung

Lung Cancer – CT Vs Bronchoscopy 75

**Indications for Bronchoscopy Diagnostic** 

Investigation of abnormal chest imaging - Lung masses, Diffuse infiltrates, Atelectasis or

Transbronchial lung biopsy, Endobronchial brush, Bronchoalveolar lavage, Transbronchial

Infection - Identification of organisms (*e.g.* suspected tuberculosis), Evaluate airways if

Interstitial Lung Disease – Bronchoalveloar lavage for differential cell count and histology **Therapeutic** Foreign body removal, Management of massive haemoptysis, Endobronchial laser ablation, Electrocautery, Cryotherapy, Brachytherapy, Photodynamic therapy, Dilation of airway, Stent placement, Bronchoscopic lung volume reduction, Thermoplasty, Radiofrequency

**Research** Endobronchial biopsies in research of airway diseases, Bronchoalveolar lavage in research

Bayoumi E et al., 2008). Bronchoscopy has an important role in the evaluation of suspected lung cancer, interstitial lung disease, persistent infection and the assessment of new pulmonary infiltrates in immunocompromised patients. Recent developments have ranged

Laser therapy, electrocautery, cryotherapy and stenting are well-described techniques for the palliation of symptoms due to airway involvement in patients with advanced stages

The decision about whether to perform a diagnostic bronchoscopy for a lesion that is suspicious for lung cancer depends largely on the location of the lesion (central Vs

The bronchoscopic procedure requires specific training and experience in both flexible and rigid bronchoscopy. The recent advances in minimally invasive procedures has ultimately included a new array of therapeutic bronchoscopy for diseases which would otherwise not be treated, or offered only surgery, ended up adding a new variety of procedures that demand constant updates for the specialist to keep up with this rapidly evolving technology

Various diagnostic accessories can be inserted through the working channel of the flexible bronchoscope. These accessories include biopsy forceps, needles, and brushes, and they

from the improvement in image quality to integration of ultrasound (Shah PL, 2008).

Investigation of symptoms – Haemoptysis, Persistent cough, Recurrent Infection

Diagnostic sampling of pathological processes - Endobronchial forceps biopsy,

Staging of lung cancer - Mediastinal tissue diagnosis and staging

Pleural effusions

needle aspiration

ablation

of diffuse lung diseases

(Simon M et al., 2010).

(Herth FJ et al., 2006).

Table 1. Indications for Bronchoscopy

peripheral) (Rivera MP et al., 2003).

recurrent or persistent infection

carcinomas except SCLCs, which are staged separately. SCLC is staged as limited or extensive disease. Limited disease is localized enough to be included in a radiation port, while extensive disease includes distant metastases.

Staging of extrathoracic disease is very important in providing optimal care for the patient with lung cancer (Shaffer K, 1997). The majority of the patients will have locally advanced or metastatic disease atthe time of diagnosis (Stinchcombe TE et al., 2009).

It is fulcral to mention that survival is inversely proportional to the stage, with early detection and diagnosis being the key to achieving surgical cure (Hollings N & Shaw P, 2002).

An early diagnosis is the determining factor in the therapeutic selection. Surgery, Chemotherapy and Radiotherapy are the most frequently utilized types of treatment. It is important to refer that in SCLC surgery has a restricted use in management of this type of lung cancer, as only a few patients with limited disease may be eligible; chemotherapy is the primary form of treatment for both stages, and radiation is included for patients staged with limited disease (Argiris A & Murren JR, 2001).

Surgery has a pivotal role in the treatment of bronchogenic carcinoma. Indeed, resection is the standard treatment of early stages (I and II) non-small cell lung cancer, remains optional for a portion of patients with a locally advanced disease (IIIA and IIIB) and in anecdotal carefully selected patients with an oligometastatic disease (IV) (Thomas PA, 2009). In many situations a combination of two or even three treatment modalities is necessary.

In this chapter the authors will emphasize the role of Bronchoscopy and Computed Tomography in the diagnosis of Lung Cancer.

#### **2. Bronchoscopy**

Bronchoscopy is an essential tool in respiratory medicine, which allows visualization and sampling from the main airways and it is a central technique in diagnosing lung cancer, but also in different therapeutic approaches (Herth FJ et al., 2006).

This exam is currently the most commonly employed invasive procedure in the practice of pulmonary medicine. Both the rigid and flexible bronchoscopes are used to diagnose and to treat various pulmonary disorders (Udaya B & Prakash S, 1999).

It is important to emphasize that the most common indication for bronchoscopy is for tissue sampling and determining the extent of lung cancer and it is, also, utilized extensively in the initial evaluation of patients suspected of having this pulmonary malignant pathology (Simon M et al., 2010) and (Aristizabal JF et al., 1998). The indications for the bronchoscopic exam are extensive. The main diagnostic indications include pulmonary involvement by neoplasms, infections, diffuse lung diseases, and airway problems (Table 1) (Plekker D et al., 2010), (Shah PL, 2008) and (Udaya B & Prakash S, 1999).

The principal advantages of flexible bronchoscopy include a more extensive view of the tracheobronchial tree, case of performance, and no requirement for general anesthesia (Suleman A et al., 2008).

Advancements in computer technology and engineering have allowed for the emergence of newer modalities to evaluate endobronchial, parenchymal, and mediastinal pathology (El-

carcinomas except SCLCs, which are staged separately. SCLC is staged as limited or extensive disease. Limited disease is localized enough to be included in a radiation port,

Staging of extrathoracic disease is very important in providing optimal care for the patient with lung cancer (Shaffer K, 1997). The majority of the patients will have locally advanced or

It is fulcral to mention that survival is inversely proportional to the stage, with early detection

An early diagnosis is the determining factor in the therapeutic selection. Surgery, Chemotherapy and Radiotherapy are the most frequently utilized types of treatment. It is important to refer that in SCLC surgery has a restricted use in management of this type of lung cancer, as only a few patients with limited disease may be eligible; chemotherapy is the primary form of treatment for both stages, and radiation is included for patients staged with

Surgery has a pivotal role in the treatment of bronchogenic carcinoma. Indeed, resection is the standard treatment of early stages (I and II) non-small cell lung cancer, remains optional for a portion of patients with a locally advanced disease (IIIA and IIIB) and in anecdotal carefully selected patients with an oligometastatic disease (IV) (Thomas PA, 2009). In many

In this chapter the authors will emphasize the role of Bronchoscopy and Computed

Bronchoscopy is an essential tool in respiratory medicine, which allows visualization and sampling from the main airways and it is a central technique in diagnosing lung cancer, but

This exam is currently the most commonly employed invasive procedure in the practice of pulmonary medicine. Both the rigid and flexible bronchoscopes are used to diagnose and to

It is important to emphasize that the most common indication for bronchoscopy is for tissue sampling and determining the extent of lung cancer and it is, also, utilized extensively in the initial evaluation of patients suspected of having this pulmonary malignant pathology (Simon M et al., 2010) and (Aristizabal JF et al., 1998). The indications for the bronchoscopic exam are extensive. The main diagnostic indications include pulmonary involvement by neoplasms, infections, diffuse lung diseases, and airway problems (Table 1) (Plekker D et al.,

The principal advantages of flexible bronchoscopy include a more extensive view of the tracheobronchial tree, case of performance, and no requirement for general anesthesia

Advancements in computer technology and engineering have allowed for the emergence of newer modalities to evaluate endobronchial, parenchymal, and mediastinal pathology (El-

and diagnosis being the key to achieving surgical cure (Hollings N & Shaw P, 2002).

situations a combination of two or even three treatment modalities is necessary.

metastatic disease atthe time of diagnosis (Stinchcombe TE et al., 2009).

while extensive disease includes distant metastases.

limited disease (Argiris A & Murren JR, 2001).

Tomography in the diagnosis of Lung Cancer.

also in different therapeutic approaches (Herth FJ et al., 2006).

treat various pulmonary disorders (Udaya B & Prakash S, 1999).

2010), (Shah PL, 2008) and (Udaya B & Prakash S, 1999).

**2. Bronchoscopy** 

(Suleman A et al., 2008).

#### **Indications for Bronchoscopy**

#### **Diagnostic**

Investigation of symptoms – Haemoptysis, Persistent cough, Recurrent Infection

Investigation of abnormal chest imaging - Lung masses, Diffuse infiltrates, Atelectasis or Pleural effusions

Diagnostic sampling of pathological processes - Endobronchial forceps biopsy, Transbronchial lung biopsy, Endobronchial brush, Bronchoalveolar lavage, Transbronchial needle aspiration

Staging of lung cancer - Mediastinal tissue diagnosis and staging

Infection - Identification of organisms (*e.g.* suspected tuberculosis), Evaluate airways if recurrent or persistent infection

Interstitial Lung Disease – Bronchoalveloar lavage for differential cell count and histology

#### **Therapeutic**

Foreign body removal, Management of massive haemoptysis, Endobronchial laser ablation, Electrocautery, Cryotherapy, Brachytherapy, Photodynamic therapy, Dilation of airway, Stent placement, Bronchoscopic lung volume reduction, Thermoplasty, Radiofrequency ablation

#### **Research**

Endobronchial biopsies in research of airway diseases, Bronchoalveolar lavage in research of diffuse lung diseases

Table 1. Indications for Bronchoscopy

Bayoumi E et al., 2008). Bronchoscopy has an important role in the evaluation of suspected lung cancer, interstitial lung disease, persistent infection and the assessment of new pulmonary infiltrates in immunocompromised patients. Recent developments have ranged from the improvement in image quality to integration of ultrasound (Shah PL, 2008).

Laser therapy, electrocautery, cryotherapy and stenting are well-described techniques for the palliation of symptoms due to airway involvement in patients with advanced stages (Simon M et al., 2010).

The decision about whether to perform a diagnostic bronchoscopy for a lesion that is suspicious for lung cancer depends largely on the location of the lesion (central Vs peripheral) (Rivera MP et al., 2003).

The bronchoscopic procedure requires specific training and experience in both flexible and rigid bronchoscopy. The recent advances in minimally invasive procedures has ultimately included a new array of therapeutic bronchoscopy for diseases which would otherwise not be treated, or offered only surgery, ended up adding a new variety of procedures that demand constant updates for the specialist to keep up with this rapidly evolving technology (Herth FJ et al., 2006).

Various diagnostic accessories can be inserted through the working channel of the flexible bronchoscope. These accessories include biopsy forceps, needles, and brushes, and they

Lung Cancer – CT Vs Bronchoscopy 77

The sensitivity of bronchoscopy for peripheral lesions is most affected by the size of the lesion. The False-Negative rate can be estimated to be fairly high in the case of peripheral lesions, especially smaller ones, because of the relatively low sensitivity in this setting

A negative initial bronchoscopy in a suspected lung cancer patient implies a greater potential for excessive delays in diagnosis and treatment in spite of a greater chance of curative treatment. Most of the delay occurs in the interval from the outpatient appointment to decision-to-treat. Patients with negative bronchoscopy require a more concerted effort to

Bronchoscopy has, also, an important role in the diagnosis of benign conditions, but the chance of finding a benign condition in a patient who is clinically suspected of having lung

The role of both old and new diagnostic bronchoscopy will continue to evolve as further improvements are made in bronchoscopes, accessory equipment, and imaging technologies

It is important to refer that special emphasis has been placed on their role in the early detection and staging of lung cancer. Some technology requires further study to delineate its role in the disease, whereas other modalities are emerging as the new gold standard in

Radiological studies play a fundamental role in every aspect of clinical medicine. Imaging offers invaluable information in establishing a diagnosis, guiding interventional procedures and directing patient management. Thus, imaging techniques play a crucial role in the diagnosis, staging and follow-up of patients with lung cancer. (Hansell DM et al., 2010) and

Computer aided diagnosis of lung CT image has been a remarkable and revolutionary step, in the early and premature detection of lung abnormalities. CT was introduced into clinical practice in the 1970s as an exciting new method for imaging the thorax. Since then, clinicians have come to rely heavily on CT for evaluating potentially malignant chest lesions and the

CT scanners can image the entire central airways in only half a second, allowing for dynamic cine imaging of the trachea and bronchi during respiratory manoeuvres (Hansell

High Resolution CT techniques developed in the last decade have become invaluable tools for the detection of subtle diffuse lung disease patterns and for their characterization into multiple possible diseases and they provide detailed information regarding the lung parenchyma and can delineate structures down to the level of the secondary pulmonary lobule. It is particularly useful for image-based diagnosis, since alteration of the lung anatomy, caused by a disease, can be clearly seen in a thin-slice CT image (Tatjana Z &

CT is still the basis of imaging studies in the preoperative staging and post- therapeutic evaluation of lung cancer and is currently the best imaging modality for diagnosing lung

achieve a timely diagnosis and treatment (Devbhandari MP et al., 2008).

(Rivera MP et al., 2003).

(Herth FJ et al., 2010).

**3. Computed tomography** 

(Wynants J et al., 2007).

DM et al., 2010).

Busayarat S, 2011).

cancer is only 1% (Rolston KVI et al., 1997).

evaluation of lung cancer (El-Bayoumi E et al., 2008).

intrathoracic spread of lung cancer (Colice GL, 1994).

have greatly aided in the diagnosis and staging of lung cancers. Their combined effect has greatly improved the ability to obtain pulmonary biopsies, especially of ever smaller lesions (Herth FJ et al., 2006) and (Udaya B & Prakash S, 1999).

Bronchoscopy with Transbronchial Needle Aspiration (TBNA) for cytologic or histologic examination of mediastinal lymph node has been shown to be a safe procedure (Rivera MP et al., 2003).

Flexible bronchoscopy is an extremely safe procedure provided some basic precautions are taken. A recent retrospective analysis of 23.682 patients over a period of 11 years showed a mortality rate of 0.013% with a complication rate of 0.739% (Jin F et al., 2008).

Complications may result from topical anesthesia, agents used for sedation or the procedure itself. Potentially life-threatening complications include respiratory depression, airway obstruction, arrhythmias, haemorrhage, infection and pneumothorax. Patient preparation for elective bronchoscopy includes fasting prior to procedure, informed consent, careful sedation in some cases, and topical anesthesia. Some of the contraindications include totally uncooperative patients, hemodynamically unstable patients, any severe acute illness and those who refuse to undergo the procedure (Plekker D et al., 2010) and (Suleman A et al., 2008).

Diagnostic yield depends on the location, size, character of the border of the lesion, and the ability to perform all sampling methods (Chechani V, 1996). The success rate of bronchoscopy in obtaining diagnostic pathologic material is significantly higher when a third- to fifth-order bronchus can be traced to the pulmonary nodule on a chest CT (positive CT bronchus sign) (Aristizabal JF et al., 1998).

The role of flexible bronchoscopy in lung cancer includes the following: inspection of airways to detect ipsilateral and contralateral endobronchial disease and their biopsy; transbronchial biopsy of the pulmonary nodule or mass; detection of mediastinal and/or hilar adenopathy; and possible transbronchial needle aspiration of the hilar or mediastinal nodes (Aristizabal JF et al., 1998). Bronchoscopy is also important in staging and it is required a careful inspection of the upper airways, superior vocal cords, trachea, carina and bronchi.

The endoscopic signs of lung carcinoma are variable, extending from a simple loss of brightness in a small area of the bronchial mucosa to a typical vegetative mass. Classically, three types of typical lesions or direct signs of tumor are taken into consideration: mass, infiltration and obstruction. However many other endoscopic changes or indirect signs (edema or local vascular fragility, localized inflammation or congestion, stenosis, bronchial stiffness and extrinsic compression) may correspond to a lung cancer so that, especially in patients at risk, these lesions should be investigated by aspiration and/or brushing and/or biopsy (Baughman RP et al., 1999) and (Cook RM et al., 1995).

Central lesions can present as an exophitic endobronchial mass, submucosal spread or a peribronchial tumor causing extrinsic compression. Most studies defined peripheral lesion as lesions that are not visible in the main or lobar airways (Rivera MP et al., 2003).

In central tumors endoscopically visible, studies referred a diagnostic yield of 91% to 94% in central lesions and 83% in peripheral lesions (Shure D, 1996).

have greatly aided in the diagnosis and staging of lung cancers. Their combined effect has greatly improved the ability to obtain pulmonary biopsies, especially of ever smaller lesions

Bronchoscopy with Transbronchial Needle Aspiration (TBNA) for cytologic or histologic examination of mediastinal lymph node has been shown to be a safe procedure (Rivera MP

Flexible bronchoscopy is an extremely safe procedure provided some basic precautions are taken. A recent retrospective analysis of 23.682 patients over a period of 11 years showed a

Complications may result from topical anesthesia, agents used for sedation or the procedure itself. Potentially life-threatening complications include respiratory depression, airway obstruction, arrhythmias, haemorrhage, infection and pneumothorax. Patient preparation for elective bronchoscopy includes fasting prior to procedure, informed consent, careful sedation in some cases, and topical anesthesia. Some of the contraindications include totally uncooperative patients, hemodynamically unstable patients, any severe acute illness and those who refuse to undergo the procedure (Plekker D et al., 2010) and (Suleman A et al.,

Diagnostic yield depends on the location, size, character of the border of the lesion, and the ability to perform all sampling methods (Chechani V, 1996). The success rate of bronchoscopy in obtaining diagnostic pathologic material is significantly higher when a third- to fifth-order bronchus can be traced to the pulmonary nodule on a chest CT (positive

The role of flexible bronchoscopy in lung cancer includes the following: inspection of airways to detect ipsilateral and contralateral endobronchial disease and their biopsy; transbronchial biopsy of the pulmonary nodule or mass; detection of mediastinal and/or hilar adenopathy; and possible transbronchial needle aspiration of the hilar or mediastinal nodes (Aristizabal JF et al., 1998). Bronchoscopy is also important in staging and it is required a careful inspection of the upper airways, superior vocal cords, trachea, carina and

The endoscopic signs of lung carcinoma are variable, extending from a simple loss of brightness in a small area of the bronchial mucosa to a typical vegetative mass. Classically, three types of typical lesions or direct signs of tumor are taken into consideration: mass, infiltration and obstruction. However many other endoscopic changes or indirect signs (edema or local vascular fragility, localized inflammation or congestion, stenosis, bronchial stiffness and extrinsic compression) may correspond to a lung cancer so that, especially in patients at risk, these lesions should be investigated by aspiration and/or brushing and/or

Central lesions can present as an exophitic endobronchial mass, submucosal spread or a peribronchial tumor causing extrinsic compression. Most studies defined peripheral lesion

In central tumors endoscopically visible, studies referred a diagnostic yield of 91% to 94% in

as lesions that are not visible in the main or lobar airways (Rivera MP et al., 2003).

mortality rate of 0.013% with a complication rate of 0.739% (Jin F et al., 2008).

(Herth FJ et al., 2006) and (Udaya B & Prakash S, 1999).

CT bronchus sign) (Aristizabal JF et al., 1998).

biopsy (Baughman RP et al., 1999) and (Cook RM et al., 1995).

central lesions and 83% in peripheral lesions (Shure D, 1996).

et al., 2003).

2008).

bronchi.

The sensitivity of bronchoscopy for peripheral lesions is most affected by the size of the lesion. The False-Negative rate can be estimated to be fairly high in the case of peripheral lesions, especially smaller ones, because of the relatively low sensitivity in this setting (Rivera MP et al., 2003).

A negative initial bronchoscopy in a suspected lung cancer patient implies a greater potential for excessive delays in diagnosis and treatment in spite of a greater chance of curative treatment. Most of the delay occurs in the interval from the outpatient appointment to decision-to-treat. Patients with negative bronchoscopy require a more concerted effort to achieve a timely diagnosis and treatment (Devbhandari MP et al., 2008).

Bronchoscopy has, also, an important role in the diagnosis of benign conditions, but the chance of finding a benign condition in a patient who is clinically suspected of having lung cancer is only 1% (Rolston KVI et al., 1997).

The role of both old and new diagnostic bronchoscopy will continue to evolve as further improvements are made in bronchoscopes, accessory equipment, and imaging technologies (Herth FJ et al., 2010).

It is important to refer that special emphasis has been placed on their role in the early detection and staging of lung cancer. Some technology requires further study to delineate its role in the disease, whereas other modalities are emerging as the new gold standard in evaluation of lung cancer (El-Bayoumi E et al., 2008).

#### **3. Computed tomography**

Radiological studies play a fundamental role in every aspect of clinical medicine. Imaging offers invaluable information in establishing a diagnosis, guiding interventional procedures and directing patient management. Thus, imaging techniques play a crucial role in the diagnosis, staging and follow-up of patients with lung cancer. (Hansell DM et al., 2010) and (Wynants J et al., 2007).

Computer aided diagnosis of lung CT image has been a remarkable and revolutionary step, in the early and premature detection of lung abnormalities. CT was introduced into clinical practice in the 1970s as an exciting new method for imaging the thorax. Since then, clinicians have come to rely heavily on CT for evaluating potentially malignant chest lesions and the intrathoracic spread of lung cancer (Colice GL, 1994).

CT scanners can image the entire central airways in only half a second, allowing for dynamic cine imaging of the trachea and bronchi during respiratory manoeuvres (Hansell DM et al., 2010).

High Resolution CT techniques developed in the last decade have become invaluable tools for the detection of subtle diffuse lung disease patterns and for their characterization into multiple possible diseases and they provide detailed information regarding the lung parenchyma and can delineate structures down to the level of the secondary pulmonary lobule. It is particularly useful for image-based diagnosis, since alteration of the lung anatomy, caused by a disease, can be clearly seen in a thin-slice CT image (Tatjana Z & Busayarat S, 2011).

CT is still the basis of imaging studies in the preoperative staging and post- therapeutic evaluation of lung cancer and is currently the best imaging modality for diagnosing lung

Lung Cancer – CT Vs Bronchoscopy 79

normal-sized lymph nodes may contain malignancy. Thoracic CT is the most commonly used noninvasive staging method of the mediastinum (Harewood GC et al., 2002). CT scanning reliably depicts mediastinal invasion, provided that the tumor surrounds the major mediastinal vessels or bronchi. So it is fulcral to mention that CT of the chest is an important imaging modality that helps in detailed imaging of the primary tumor and its anatomic relationship to other structures, and it provides information with respect to the

Currently available results on CT screening for lung cancer show that the work-up on baseline screening can be confined to less than 15% of the individuals and to less than 6% on annual repeat screening, almost all cases are detected by screening with very few diagnoses made between screening on the prompting of symptoms, and over 80% of all the diagnoses

Although the introduction of low-dose spiral CT is considered to be one of the most promising clinical research developments, CT screening is used for detecting small peripheral lesions. CT screening is a far more sensitive method than conventional radiography for identifying small, potentially early-stage, lung cancers (Hansell DM et al.,

CT scanning of the chest is useful in providing anatomic detail that better identifies the location of the tumor, its proximity to local structures, and whether or not lymph nodes in the mediastinum are enlarged (Silvestri GA et al., 2007). CT enables us to see the lung anatomy in great detail and has been used to accurately diagnose lung diseases and is a remarkable technique for visualizing structures within the thorax (Colice GL, 1994) and (Xu

In the decades, CT has been the main diagnosis tool of lung cancer for its convenience and safety, and widely used in clinical practice. However, it is difficult to distinguish between benign and malignant cases in the CT images of pulmonary nodules, especially for the doctors who were lack of experience. This imaging modality is useful in predicting the likelihood of achieving positive histocytology at Flexible Bronchoscopy. The overall CT prediction is superior to any of the individual CT features taken alone (Bungay HK et al.,

The main objective of this study was to analyze the role of Bronchoscopy and CT in the diagnosis of lung cancer by evaluating the effectiveness of these techniques in the presence

It is important to emphasize that the possibility to evaluate two important diagnostic

This retrospective study was conducted with the approval of the institutional review board

methods in the presence of Lung Cancer is the main factor that justifies this study.

size of mediastinal lymph nodes and the status of the pleural space.

**4. CT Vs bronchoscopy in the diagnosis of lung cancer** 

are of Stage I (Henschke CI et al., 2005).

2010) and (Yasufuku K, 2010).

2000) and (Xiuhua G et al., 2011).

of this malignant pathology.

of the Hospital Distrital da Figueira da Foz.

Y et al., 2006).

**4.1 Purpose** 

**4.2 Methods** 

diseases. The most recent developments in multidetector technology have dramatically improved the temporal and spatial resolution of CT (Lauren F et al., 2006) and (Tatjana Z & Busayarat S, 2011).

A chest CT is obtained in most of the patients with a pulmonary nodule or mass. A large body of imaging literature suggests that CT is a sensitive method to evaluate the proximal bronchi for neoplasm. It is also suggested that CT is helpful in predicting the yield of bronchoscopy in obtaining pathologic diagnosis of a pulmonary nodule or mass. In addition to demonstrating the location of the nodule (lobe, peripheral vs. central location), CT can also demonstrate if a third or fourth-order bronchus leads to or is contained within the pulmonary nodule or mass (Aristizabal JF et al., 1998).

CT plays a relevant role in the determination of presence and extent of lung cancer, demonstrating the size and site of the tumor. However, this exam presents some limitations such as high cost, utilization of ionizing radiation, contrast agent nephrotoxicity, besides the necessity of further procedures to confirm the diagnosis (Oliveira C & Saraiva A., 2010).

The findings of CT scans of the chest and clinical presentation usually allow a presumptive differentiation between SCLC and NSCLC. CT may also predict the yield of bronchoscopy in making a tissue diagnosis of pulmonary nodule or mass, if the predictive value of bronchoscopy is low, an alternate method of diagnosis may be chosen. CT can identify specific features in lung nodules that are diagnostic (e.g. arteriovenous fistulae, rounded atelectasis, fungus balls, mucoid impaction and infarcts) (Aristizabal JF et al., 1998), (Hollings N & Shaw P, 2002) and (Rivera MP et al., 2003).

This imaging modality also assists the implementation of complementary techniques including transthoracic needle aspiration biopsy, mediastinoscopy or video-assisted thoracic surgery (Landreneau RJ et al., 1996).

The CT indispensability in the study of lung cancer is associated with the obligatoriness of endoscopy of the respiratory tract with flexible endoscope (Cordeiro AJA Robalo, 1995).

Computed Tomography can detect tumors as small as 0.5 cm compared to a chest radiography which detects tumors at 3 cm. Yet, it is important to note that smaller tumor size does not necessarily equate to an early stage cancer as each tumor has its own growth pattern and disease development (Read et al., 2006).

It is important to note that pulmonary nodules of lung cancer in CT images share similarity with benign cases to some extent (such as tuberculosis, inflammatory pseudotumor, hamartoma, and aspergillosis) which makes it difficult to distinguish (Jee WC et al., 2008).

The majority of patients who present with lung cancer undergo CT scanning of the chest and liver (adrenal glands should be routinely included if lung cancer is suspected) and it is useful in helping to distinguish vascular structures from lymph nodes as well as in delineating mediastinal invasion by centrally located tumors (Al Jahdali H, 2008). Prediction of lymph node metastasis using combination of gene signatures and chest CT is superior to the CT-only diagnosis (Chang JW et al., 2008).

Morphologic imaging techniques such as CT cannot always differentiate reliably between benign and malignant lesions, as enlarged nodes may also be inflammatory whereas

diseases. The most recent developments in multidetector technology have dramatically improved the temporal and spatial resolution of CT (Lauren F et al., 2006) and (Tatjana Z &

A chest CT is obtained in most of the patients with a pulmonary nodule or mass. A large body of imaging literature suggests that CT is a sensitive method to evaluate the proximal bronchi for neoplasm. It is also suggested that CT is helpful in predicting the yield of bronchoscopy in obtaining pathologic diagnosis of a pulmonary nodule or mass. In addition to demonstrating the location of the nodule (lobe, peripheral vs. central location), CT can also demonstrate if a third or fourth-order bronchus leads to or is contained within the

CT plays a relevant role in the determination of presence and extent of lung cancer, demonstrating the size and site of the tumor. However, this exam presents some limitations such as high cost, utilization of ionizing radiation, contrast agent nephrotoxicity, besides the necessity of further procedures to confirm the diagnosis

The findings of CT scans of the chest and clinical presentation usually allow a presumptive differentiation between SCLC and NSCLC. CT may also predict the yield of bronchoscopy in making a tissue diagnosis of pulmonary nodule or mass, if the predictive value of bronchoscopy is low, an alternate method of diagnosis may be chosen. CT can identify specific features in lung nodules that are diagnostic (e.g. arteriovenous fistulae, rounded atelectasis, fungus balls, mucoid impaction and infarcts) (Aristizabal JF et al., 1998),

This imaging modality also assists the implementation of complementary techniques including transthoracic needle aspiration biopsy, mediastinoscopy or video-assisted thoracic

The CT indispensability in the study of lung cancer is associated with the obligatoriness of endoscopy of the respiratory tract with flexible endoscope (Cordeiro AJA Robalo, 1995).

Computed Tomography can detect tumors as small as 0.5 cm compared to a chest radiography which detects tumors at 3 cm. Yet, it is important to note that smaller tumor size does not necessarily equate to an early stage cancer as each tumor has its own growth

It is important to note that pulmonary nodules of lung cancer in CT images share similarity with benign cases to some extent (such as tuberculosis, inflammatory pseudotumor, hamartoma, and aspergillosis) which makes it difficult to distinguish (Jee WC et al., 2008). The majority of patients who present with lung cancer undergo CT scanning of the chest and liver (adrenal glands should be routinely included if lung cancer is suspected) and it is useful in helping to distinguish vascular structures from lymph nodes as well as in delineating mediastinal invasion by centrally located tumors (Al Jahdali H, 2008). Prediction of lymph node metastasis using combination of gene signatures and chest CT is superior to

Morphologic imaging techniques such as CT cannot always differentiate reliably between benign and malignant lesions, as enlarged nodes may also be inflammatory whereas

Busayarat S, 2011).

(Oliveira C & Saraiva A., 2010).

surgery (Landreneau RJ et al., 1996).

pulmonary nodule or mass (Aristizabal JF et al., 1998).

(Hollings N & Shaw P, 2002) and (Rivera MP et al., 2003).

pattern and disease development (Read et al., 2006).

the CT-only diagnosis (Chang JW et al., 2008).

Currently available results on CT screening for lung cancer show that the work-up on baseline screening can be confined to less than 15% of the individuals and to less than 6% on annual repeat screening, almost all cases are detected by screening with very few diagnoses made between screening on the prompting of symptoms, and over 80% of all the diagnoses are of Stage I (Henschke CI et al., 2005).

anatomic relationship to other structures, and it provides information with respect to the

size of mediastinal lymph nodes and the status of the pleural space.

Although the introduction of low-dose spiral CT is considered to be one of the most promising clinical research developments, CT screening is used for detecting small peripheral lesions. CT screening is a far more sensitive method than conventional radiography for identifying small, potentially early-stage, lung cancers (Hansell DM et al., 2010) and (Yasufuku K, 2010).

CT scanning of the chest is useful in providing anatomic detail that better identifies the location of the tumor, its proximity to local structures, and whether or not lymph nodes in the mediastinum are enlarged (Silvestri GA et al., 2007). CT enables us to see the lung anatomy in great detail and has been used to accurately diagnose lung diseases and is a remarkable technique for visualizing structures within the thorax (Colice GL, 1994) and (Xu Y et al., 2006).

In the decades, CT has been the main diagnosis tool of lung cancer for its convenience and safety, and widely used in clinical practice. However, it is difficult to distinguish between benign and malignant cases in the CT images of pulmonary nodules, especially for the doctors who were lack of experience. This imaging modality is useful in predicting the likelihood of achieving positive histocytology at Flexible Bronchoscopy. The overall CT prediction is superior to any of the individual CT features taken alone (Bungay HK et al., 2000) and (Xiuhua G et al., 2011).

#### **4. CT Vs bronchoscopy in the diagnosis of lung cancer**

#### **4.1 Purpose**

The main objective of this study was to analyze the role of Bronchoscopy and CT in the diagnosis of lung cancer by evaluating the effectiveness of these techniques in the presence of this malignant pathology.

It is important to emphasize that the possibility to evaluate two important diagnostic methods in the presence of Lung Cancer is the main factor that justifies this study.

#### **4.2 Methods**

This retrospective study was conducted with the approval of the institutional review board of the Hospital Distrital da Figueira da Foz.

Lung Cancer – CT Vs Bronchoscopy 81

Table 2. Relation between the results of Bronchoscopy and the Presence or Absence of Lung

Table 3. Relation between the results of CT exams and the Presence or Absence of Lung

SENSITIVITY SPECIFICITY ACCURACY FALSE-

Bronchoscopy 83.8% 81.8% 82.8% 18.2% 16.2% CT 81.1% 63.6% 72.8% 36.4% 18.9%

The results of Bronchoscopy confirmed the fact that this is an important test in the diagnosis of lung cancer, by its diagnostical dependence in the pathological examination of tissue or cells obtained by various techniques of biopsy. Several studies have demonstrated that more

Table 4. Sensitivity, Specificity, Accuracy, False-Positive and False-Negative of

Bronchoscopy

CT

POSITIVE

NEGATIVE

POSITIVE

NEGATIVE

Cancer (2 = 14,533; gl=1; p=0; Kappa value =0,451)

TOTAL

Bronchoscopy and CT Exams

Cancer (2 = 30.125; gl = 1; p = 0; Kappa value = 0.656)

TOTAL

Presence or Absence of Lung Cancer TOTAL

Presence or Absence of Lung Cancer TOTAL

POSITIVE

FALSE-NEGATIVE

PRESENT ABSENT

N 30 12 42 % CT 71.4% 28.6% 100.0% % TOTAL 42.9% 17.1% 60.0%

N 7 21 28 % CT 25.0% 75.0% 100.0% % TOTAL 10.0% 30.0% 40.0%

N 37 33 70 % CT 52.9% 47.1% 100.0% % TOTAL 52.9% 47.1% 100.0%

PRESENT ABSENT

N 31 6 37 % Bronchoscopy 83.8% 16.2% 100.0% % Total 44.3% 8,6% 52.9%

N 6 27 33 % Bronchoscopy 18.2% 81.8% 100.0% % Total 8.6% 38.6% 47.1%

N 37 33 70 % Bronchoscopy 52.9% 47.1% 100.0% % Total 52.9% 47.1% 100.0%

This investigation was done in the Department of Pneumology of the Hospital Distrital da Figueira da Foz, between January and July 2009.

To carry out this study, the medical records of 70 patients were analyzed (42 patients were men and 28 patients were women; the mean age was 66 years).

These patients were referred to the Department of Pneumology of the Hospital Distrital da Figueira da Foz (along a four-year period - January 2003 to January 2007) and submitted to Bronchoscopy and Computed Tomography for suspicion of Lung Cancer, confirmed or not by the study of the pathology.

It is fulcral to refer that bronchoscopy and CT exams were considered as either negative or positive according to the information included in the respective reports. Bronchoscopy exams and the subsequent reports were performed by a Pneumologist. A Radiologist performed the chest CT exams and prepared the respective reports.

In this investigation agreements between the results of the exam and the presence or absence of lung cancer were analyzed by calculating Cohen Kappa statistics. Agreements were assessed for both exams in study (Bronchoscopy and Computed Tomography).

#### **4.3 Results and discussion**

It is important to mention that among the 70 patients submitted to bronchoscopy and CT, 37 were diagnosed with lung cancer.

The statistical analysis permitted to observe that the relation between the bronchoscopy results and the presence or absence of lung cancer was statistically significant (*p* < 0.05). Also the Kappa Value 0.656 demonstrated a good rate of agreement between the results.

It is primordial to refer that the authors observed that in the 37 positive bronchoscopic studies, 83.8% corresponded to the presence of cancer, and 16.2% to a negative diagnosis of this lung pathology. As regards the 33 negative bronchoscopic exams, 81.8% corresponded to the absence of lung cancer, and 18.2% to the presence of this malignant pathology (Table 2).

The relation between CT results and the presence or absence of lung cancer was considered statistically significant (p < 0.05), after the statistical analysis. The kappa value was 0.451, corresponding to a weak agreement between the results.

Among the 42 CT studies interpreted as positive, 71.4% corresponded to the presence of this malignant pathology, and 28.6% corresponded to the absence of this pathology. In the 28 CT studies read as negative, 75% corresponded to a negative diagnosis of lung cancer, and 25% demonstrated the presence of this disease (Table 3).

In Table 4 is possible to observe the sensitivity, specificity, accuracy, false-positive and falsenegative of bronchoscopy and CT scans. In this study, Bronchoscopy sensitivity was 83.8%, specificity 81.8%, and accuracy 82.8%. False-positive results corresponded to 18.2%, and false-negative results to 16.2%.

The CT sensitivity was 81.1%, specificity 63.6%, and accuracy 72.8%. False-positive results corresponded to 36.4% and false-negative results to 18.9%.

This investigation was done in the Department of Pneumology of the Hospital Distrital da

To carry out this study, the medical records of 70 patients were analyzed (42 patients were

These patients were referred to the Department of Pneumology of the Hospital Distrital da Figueira da Foz (along a four-year period - January 2003 to January 2007) and submitted to Bronchoscopy and Computed Tomography for suspicion of Lung Cancer, confirmed or not

It is fulcral to refer that bronchoscopy and CT exams were considered as either negative or positive according to the information included in the respective reports. Bronchoscopy exams and the subsequent reports were performed by a Pneumologist. A Radiologist

In this investigation agreements between the results of the exam and the presence or absence of lung cancer were analyzed by calculating Cohen Kappa statistics. Agreements

It is important to mention that among the 70 patients submitted to bronchoscopy and CT, 37

The statistical analysis permitted to observe that the relation between the bronchoscopy results and the presence or absence of lung cancer was statistically significant (*p* < 0.05). Also the Kappa Value 0.656 demonstrated a good rate of agreement between the results.

It is primordial to refer that the authors observed that in the 37 positive bronchoscopic studies, 83.8% corresponded to the presence of cancer, and 16.2% to a negative diagnosis of this lung pathology. As regards the 33 negative bronchoscopic exams, 81.8% corresponded to the absence of lung cancer, and 18.2% to the presence of this malignant

The relation between CT results and the presence or absence of lung cancer was considered statistically significant (p < 0.05), after the statistical analysis. The kappa value was 0.451,

Among the 42 CT studies interpreted as positive, 71.4% corresponded to the presence of this malignant pathology, and 28.6% corresponded to the absence of this pathology. In the 28 CT studies read as negative, 75% corresponded to a negative diagnosis of lung cancer, and 25%

In Table 4 is possible to observe the sensitivity, specificity, accuracy, false-positive and falsenegative of bronchoscopy and CT scans. In this study, Bronchoscopy sensitivity was 83.8%, specificity 81.8%, and accuracy 82.8%. False-positive results corresponded to 18.2%, and

The CT sensitivity was 81.1%, specificity 63.6%, and accuracy 72.8%. False-positive results

were assessed for both exams in study (Bronchoscopy and Computed Tomography).

Figueira da Foz, between January and July 2009.

by the study of the pathology.

**4.3 Results and discussion** 

pathology (Table 2).

false-negative results to 16.2%.

were diagnosed with lung cancer.

men and 28 patients were women; the mean age was 66 years).

performed the chest CT exams and prepared the respective reports.

corresponding to a weak agreement between the results.

demonstrated the presence of this disease (Table 3).

corresponded to 36.4% and false-negative results to 18.9%.


Table 2. Relation between the results of Bronchoscopy and the Presence or Absence of Lung Cancer (2 = 30.125; gl = 1; p = 0; Kappa value = 0.656)


Table 3. Relation between the results of CT exams and the Presence or Absence of Lung Cancer (2 = 14,533; gl=1; p=0; Kappa value =0,451)


Table 4. Sensitivity, Specificity, Accuracy, False-Positive and False-Negative of Bronchoscopy and CT Exams

The results of Bronchoscopy confirmed the fact that this is an important test in the diagnosis of lung cancer, by its diagnostical dependence in the pathological examination of tissue or cells obtained by various techniques of biopsy. Several studies have demonstrated that more

Lung Cancer – CT Vs Bronchoscopy 83

available, which aspire to reduce the time to diagnosis and to simplify the initial staging

The modality selected to diagnose a suspected lung cancer is based on the size and location of the primary tumor in the lung, the presence of potential metastatic spread, and the

The main goals in selecting a specific diagnostic modality are to maximize the yield of the selected procedure for both diagnosis and staging and to avoid unnecessary invasive tests. The selection of the most appropriate test is done in a multidisciplinary way with contribution from a pulmonologist, radiologist and thoracic surgeon (Rivera MP et al., 2003). The radiological diagnosis has become a key element in the evaluation and management of the patients with lung cancer and, in some instances, accurate staging and determination of appropriate treatment can be done noninvasively, with only imaging modalities, although

Flexible Bronchoscopy with its attendant procedures is a valuable diagnostic tool in the workup of a patient who is suspected of having lung cancer. In the last decade, major

Bronchoscopy results in this study corroborated the relevance of this method in the diagnosis of this malignant pathology, considering its dependence on the anatomopathological study of tissue or cells obtained through different biopsy techniques. CT is today one of the cornerstones of imaging techniques and with the improved technical

The specificity of CT is limited and a histologic diagnosis or follow-up evaluation is, usually, necessary. The potential benefits of introducing CT screening for lung cancer detection may be its ability to detect more early stage tumors and decrease the numbers of later stage disease. And CT can best be thought of as a imaging tool that can provide a roadmap for

It is important to emphasize that in the detection and diagnosis of lung cancer should be

**False positive** - is the proportion of absent events that yield positive test outcomes, i.e., the

**False – Negative –** is the proportion of events that are being tested for which yield negative test outcomes with the test, i.e., the conditional probability of a negative test result given

**Sensitivity** - measures the proportion of actual positives which are correctly identified as such (e.g. the percentage of sick people who are correctly identified as having the

**Specificity** - measures the proportion of negatives which are correctly identified (e.g. the percentage of healthy people who are correctly identified as not having the condition).

anticipated treatment plan (Schreiber G et al., 2003).

in numerous situations surgical staging is also necessary.

advances have been made in interventional bronchoscopy.

more accurate surgical staging.

**6. Definitions** 

condition).

quality of CT scans, more small lesions are now detectable in the lungs.

carried out complementary exams that include CT and Bronchoscopy.

conditional probability of a positive test result given an absent event.

that the event being looked for has taken place.

approach.

than 70% of lung carcinomas are visible to bronchoscopy and combining bronchial biopsy, bronchial brushing, and bronchial washing results in an excellent diagnostic yield (Govert JA et al., 1998) and (Herth FJF, 2011).

The false-negative results of bronchoscopy found in the current study (16.2%) are due to the presence of peripheral lesions, particularly the smaller ones, because of the poor role played by bronchoscopy in these cases. Some published studies indicate that the sensitivity of bronchoscopy is poor for peripheral lesions that are < 2 cm in diameter (Chechani V, 1996), (Popovich J Jr et al., 1982) and (Schreiber G et al., 2003).

In the present investigation the authors obtained a sensitivity of 81.1% for CT, corroborating reports in the literature demonstrating that as lung cancer is detected by radiological methods, ¾ of the natural history of the pathology were already completed (Scagliotti G, 2001).

Radiology has traditionally played a crucial role in the evaluation and follow-up of patients with lung cancer. That role has changed with time, particularly with advances in surgical treatment and the introduction of new, less invasive techniques, such as video-assisted thoracoscopy and different imaging modalities have been used in the diagnosis and staging of lung cancer; reports refer that CT plays an important role in the diagnosis of lung cancer, however has been limited by uncertain detection rate for early stage of NSCLC, particularly central tumors (Jiang F et al., 2009) and (Shaffer K, 1997). CT scanning is required for a better delineation of the abnormality detected on plain radiographs.

Some studies in the literature mention that imaging plays an essential role in diagnosing, staging, and following patients with lung cancer (Patz EF Jr, 1999) and (Sarinas PS et al., 1996).

The specificity of CT in this investigation is a result of the number of false-positive results (36.4%) and this situation is due to the fact that radiological findings suggestive of lung cancer (that lead to the rate of a CT study as positive) such as parenchymal mass with speculated margins, thickwalled cavities, microlobulations, cavitary nodules and chest wall invasion may be observed in other diseases such as infections, pulmonary inflammatory processes, infarction and lung abscesses (George CJ et al., 2004), (Madhusudhan KS et al., 2007) and (Runciman DM et al., 1993).

Several studies indicate that the high proportion of false-positive CT findings may reach 70% and thus, histological confirmation is essential for diagnosis (Makris D et al., 2007) and (Swensen SJ et al., 2005).

#### **5. Conclusion**

Lung cancer is a common pathology that has a poor prognosis and survival is inversely proportional to the stage, with early detection and diagnosis being the key to achieving surgical cure.

Despite medical advances lung cancer remains the leading cause of cancer deaths (Serke M & Schönfeld N, 2007).

The diagnosis of lung cancer is essentially achieved by CT and bronchoscopic techniques. During these years numerous improvements of these diagnostic tools have been made

than 70% of lung carcinomas are visible to bronchoscopy and combining bronchial biopsy, bronchial brushing, and bronchial washing results in an excellent diagnostic yield (Govert

The false-negative results of bronchoscopy found in the current study (16.2%) are due to the presence of peripheral lesions, particularly the smaller ones, because of the poor role played by bronchoscopy in these cases. Some published studies indicate that the sensitivity of bronchoscopy is poor for peripheral lesions that are < 2 cm in diameter (Chechani V, 1996),

In the present investigation the authors obtained a sensitivity of 81.1% for CT, corroborating reports in the literature demonstrating that as lung cancer is detected by radiological methods, ¾ of the natural history of the pathology were already completed (Scagliotti G,

Radiology has traditionally played a crucial role in the evaluation and follow-up of patients with lung cancer. That role has changed with time, particularly with advances in surgical treatment and the introduction of new, less invasive techniques, such as video-assisted thoracoscopy and different imaging modalities have been used in the diagnosis and staging of lung cancer; reports refer that CT plays an important role in the diagnosis of lung cancer, however has been limited by uncertain detection rate for early stage of NSCLC, particularly central tumors (Jiang F et al., 2009) and (Shaffer K, 1997). CT scanning is required for a better

Some studies in the literature mention that imaging plays an essential role in diagnosing, staging, and following patients with lung cancer (Patz EF Jr, 1999) and (Sarinas PS et al.,

The specificity of CT in this investigation is a result of the number of false-positive results (36.4%) and this situation is due to the fact that radiological findings suggestive of lung cancer (that lead to the rate of a CT study as positive) such as parenchymal mass with speculated margins, thickwalled cavities, microlobulations, cavitary nodules and chest wall invasion may be observed in other diseases such as infections, pulmonary inflammatory processes, infarction and lung abscesses (George CJ et al., 2004), (Madhusudhan KS et al.,

Several studies indicate that the high proportion of false-positive CT findings may reach 70% and thus, histological confirmation is essential for diagnosis (Makris D et al., 2007) and

Lung cancer is a common pathology that has a poor prognosis and survival is inversely proportional to the stage, with early detection and diagnosis being the key to achieving

Despite medical advances lung cancer remains the leading cause of cancer deaths (Serke M

The diagnosis of lung cancer is essentially achieved by CT and bronchoscopic techniques. During these years numerous improvements of these diagnostic tools have been made

JA et al., 1998) and (Herth FJF, 2011).

2007) and (Runciman DM et al., 1993).

(Swensen SJ et al., 2005).

**5. Conclusion** 

surgical cure.

& Schönfeld N, 2007).

2001).

1996).

(Popovich J Jr et al., 1982) and (Schreiber G et al., 2003).

delineation of the abnormality detected on plain radiographs.

available, which aspire to reduce the time to diagnosis and to simplify the initial staging approach.

The modality selected to diagnose a suspected lung cancer is based on the size and location of the primary tumor in the lung, the presence of potential metastatic spread, and the anticipated treatment plan (Schreiber G et al., 2003).

The main goals in selecting a specific diagnostic modality are to maximize the yield of the selected procedure for both diagnosis and staging and to avoid unnecessary invasive tests. The selection of the most appropriate test is done in a multidisciplinary way with contribution from a pulmonologist, radiologist and thoracic surgeon (Rivera MP et al., 2003).

The radiological diagnosis has become a key element in the evaluation and management of the patients with lung cancer and, in some instances, accurate staging and determination of appropriate treatment can be done noninvasively, with only imaging modalities, although in numerous situations surgical staging is also necessary.

Flexible Bronchoscopy with its attendant procedures is a valuable diagnostic tool in the workup of a patient who is suspected of having lung cancer. In the last decade, major advances have been made in interventional bronchoscopy.

Bronchoscopy results in this study corroborated the relevance of this method in the diagnosis of this malignant pathology, considering its dependence on the anatomopathological study of tissue or cells obtained through different biopsy techniques.

CT is today one of the cornerstones of imaging techniques and with the improved technical quality of CT scans, more small lesions are now detectable in the lungs.

The specificity of CT is limited and a histologic diagnosis or follow-up evaluation is, usually, necessary. The potential benefits of introducing CT screening for lung cancer detection may be its ability to detect more early stage tumors and decrease the numbers of later stage disease. And CT can best be thought of as a imaging tool that can provide a roadmap for more accurate surgical staging.

It is important to emphasize that in the detection and diagnosis of lung cancer should be carried out complementary exams that include CT and Bronchoscopy.

#### **6. Definitions**

**False positive** - is the proportion of absent events that yield positive test outcomes, i.e., the conditional probability of a positive test result given an absent event.

**False – Negative –** is the proportion of events that are being tested for which yield negative test outcomes with the test, i.e., the conditional probability of a negative test result given that the event being looked for has taken place.

**Sensitivity** - measures the proportion of actual positives which are correctly identified as such (e.g. the percentage of sick people who are correctly identified as having the condition).

**Specificity** - measures the proportion of negatives which are correctly identified (e.g. the percentage of healthy people who are correctly identified as not having the condition).

Lung Cancer – CT Vs Bronchoscopy 85

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**Positive predictive value** - is the proportion of subjects with positive test results who are correctly diagnosed. It is a critical measure of the performance of a diagnostic method, as it reflects the probability that a positive test reflects the underlying condition being tested for.

**Negative predictive value** - is a summary statistic used to describe the performance of a diagnostic testing procedure. It is defined as the proportion of subjects with a negative test result who are correctly diagnosed. A high NPV means that when the test yields a negative result, it is uncommon that the result should have been positive

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Skyes, A. M., Aughenbaugh, G. L., Tatjana, Z. & Busayarat, S. (2011). Computeraided Analyses and Interpretation of HRCT Images of the Lung, *in* Homma N, editor, *Theory and Applications of CT Imaging and analysis*. Rijeka: In-Tech, p. 37-62

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Computer-aided classification of interstitial lung diseases via MDCT: 3D adaptive

survival: which advanced stage nonsmall cell lung cancer patients attain long-term

123:115S-128S

112:235S-238S

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*Wochenschr* 132(21):1165-9

Shah, P. L. (2008). Flexible bronchoscopy, *Medicine* 36(39:151-154

Lippincott Williams and Wilkins, p. 471-477

small cell lung cancer, *Proc Am Thorac Soc* 6:233–41.

Thomas, P.A. (2009). Standards of surgery in lung cancer., *Rev Prat* 59(7):934-8

Yasufuku, K. (2010). Early diagnosis of lung cancer, *Clin Chest Med* 31(1):39-47

multiple feature method (3D AMFM), *Acad Radiol* 13(8):969-78

for Diagnosis of Suspected Lung Cancer: Summary of Published Evidence, *Chest*


Jiang, F., Todd, N. W., Liu, Z., Katz, R. L. & Stass, S. A. (2009). Combined genetic analysis of

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**Section 3** 

**Bronchoscopy in Special Situations** 

Westeel, V. (2003). Diagnosis of lung cancer, *Rev Prat* 53:727–34. Witschi, H. (2001). A Short Story of Lung Cancer, *Toxicol Sci* 64(1):4-6 Wynants, J., Stroobants, S., Dooms, C. & Vansteenkiste, J. (2007). Staging of lung cancer, *Radiol Clin North Am* 45:609–25

## **Section 3**

**Bronchoscopy in Special Situations** 

88 Global Perspectives on Bronchoscopy

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*Radiol Clin North Am* 45:609–25

**5** 

**Bronchoscopy in** 

*Intensive Care Unit Hospital of Jerez* 

Angel Estella

*Spain* 

**Mechanically Ventilated Patients** 

The origins of bronchoscopy date back to 1897 when Gustav Killian, considered "the father of bronchoscopy", performed the first airway examination with a rigid esophagoscope to a farmer extracting a piece of bone that had lodged in the main stem bronchus. Shigeto Ikeda in 1964 revolutionized the field of bronchoscopy with the introduction of a flexible instrument that could be introduced to sub-segmental bronchi and allowed the extraction of samples for cytological examination. Endoscopy Machida Company Ltd and Olympus Optical Company Ltd in 1966 built the first prototype of a fiberoptic bronchoscope. Since its introduction in routine clinical practice in the decade of 60 has been improved, increasing its indications. 30 years ago, rigid bronchoscope was the main instrument for the direct examination of the tracheobronchial tree; and even today is considered the choice procedure in two emergencies, haemoptysis and removal of foreign

Currently, flexible fiberoptic bronchoscopy is an invasive procedure widely applied in pneumology, intensive care and thoracic surgery. It has become the procedure of choice in most examinations of the tracheobronchial tree and it is of significant help in the diagnosis and treatment of pulmonary pathology in critically ill patients. It is increasingly being used in intensive care units (ICU) because it is easy to perform at the bedside, thus avoiding potentially dangerous transfers out of the ICU, and few complications have been described with its use. The procedure revolutionized the management of respiratory diseases and in the critically ill patients is considered a safe procedure. In view of this, it is currently

Although, by definition, critically ill patients are a priori more susceptible to developing complications during the procedure, mechanically ventilated patients, because their airway is secured, are paradoxically less at risk than when the procedure is performed on patients

Actually flexible fiberoptic bronchoscopy is a common diagnostic and therapeutic tool for patients admitted in ICU. In the literature flexible fiberoptic bronchoscopy has been scarcely documented in critically ill patients. This chapter summarizes main indications, complications and requirements necessary to perform a bronchoscopy in mechanically

considered to be an essential piece of ICU equipment.

breathing spontaneously.

ventilated patients.

**1. Introduction** 

bodies.

### **Bronchoscopy in Mechanically Ventilated Patients**

Angel Estella *Intensive Care Unit Hospital of Jerez Spain* 

#### **1. Introduction**

The origins of bronchoscopy date back to 1897 when Gustav Killian, considered "the father of bronchoscopy", performed the first airway examination with a rigid esophagoscope to a farmer extracting a piece of bone that had lodged in the main stem bronchus. Shigeto Ikeda in 1964 revolutionized the field of bronchoscopy with the introduction of a flexible instrument that could be introduced to sub-segmental bronchi and allowed the extraction of samples for cytological examination. Endoscopy Machida Company Ltd and Olympus Optical Company Ltd in 1966 built the first prototype of a fiberoptic bronchoscope. Since its introduction in routine clinical practice in the decade of 60 has been improved, increasing its indications. 30 years ago, rigid bronchoscope was the main instrument for the direct examination of the tracheobronchial tree; and even today is considered the choice procedure in two emergencies, haemoptysis and removal of foreign bodies.

Currently, flexible fiberoptic bronchoscopy is an invasive procedure widely applied in pneumology, intensive care and thoracic surgery. It has become the procedure of choice in most examinations of the tracheobronchial tree and it is of significant help in the diagnosis and treatment of pulmonary pathology in critically ill patients. It is increasingly being used in intensive care units (ICU) because it is easy to perform at the bedside, thus avoiding potentially dangerous transfers out of the ICU, and few complications have been described with its use. The procedure revolutionized the management of respiratory diseases and in the critically ill patients is considered a safe procedure. In view of this, it is currently considered to be an essential piece of ICU equipment.

Although, by definition, critically ill patients are a priori more susceptible to developing complications during the procedure, mechanically ventilated patients, because their airway is secured, are paradoxically less at risk than when the procedure is performed on patients breathing spontaneously.

Actually flexible fiberoptic bronchoscopy is a common diagnostic and therapeutic tool for patients admitted in ICU. In the literature flexible fiberoptic bronchoscopy has been scarcely documented in critically ill patients. This chapter summarizes main indications, complications and requirements necessary to perform a bronchoscopy in mechanically ventilated patients.

Bronchoscopy in Mechanically Ventilated Patients 93

In mechanically ventilated patients several considerations (table 1) are recommended during the peribronchoscopy period to ensure the maintenance of adequate ventilation and oxygenation while minimizing the risk of barotrauma. Continuous physiological monitoring must be continued during and after the procedure. During the bronchoscopy exhaustive ventilator parameter monitoring is required to take care to maintain tidal volume and to control airway pressures. Continuous haemodynamic monitoring with heart rate, arterial



Table 1. Recommendations to perform bronchoscopy in mechanically ventilated patients.

Prior to and during fiberoptic bronchoscopy inspired fraction of oxygen (FiO2) must be increased to 1 and following the procedure the FiO2 will be adjusted according to the clinical situation of the patient. Pressure-control mode has demonstrated to deliver a greater baseline volume than volume- control mode in a lung model; careful readjustment of the inspiratory pressure level is necessary in Pressure-control mode to maximize exhaled tidal volume. Finally inspiratory pressure level must be reduced to pre-procedure values when the bronchoscope is removed. Effects of fiberoptic bronchoscopy on the respiratory function have been amply analyzed in patients with spontaneous breathing but in mechanically ventilated patients has been scarcely studied. Recently it was documented in a study to analyze the effects on respiratory mechanics of flexible bronchoscopy in mechanically ventilated patients. A transitory deterioration of pulmonary mechanics with a decrease of respiratory system compliance and an increase in airway resistance was observed in fifty mechanically ventilated patients after bronchoscopy with bronchoalveolar lavage

Sedation and muscle relaxation may be necessary during the procedure to prevent barotrauma caused by airway irritation reflex and cough; although critically ill patients may

Flexible bronchoscopy is an invasive procedure and therefore needs documented informed consent from the patient or legal representative if the patient lacks medical decision-making

be heavily sedated we recommend short-acting benzodiazepines.







pressure and oximetry is mandatory.



diameter.

(Estella,2010).

capacity.

#### **2. Procedure in mechanically ventilated patients**

In mechanically ventilated patients bronchoscopy is performed through the endotracheal or tracheotomy tube by means of a specially adapted valve that facilitates the introduction of the bronchoscope into the airway without disconnection of mechanical ventilation. The adapter connects the endotracheal tube with the ventilator circuit and has a side port to allow entry of the bronchoscope into the endotracheal tube without disrupting the ongoing mechanical ventilation (figure 1).This valve allows continued ventilation and maintenance of PEEP during the technique.This is especially important in patients with adult respiratory distress syndrome.

Fig. 1. Adapted valve to perform bronchoscopy in mechanically ventilated patients.

It has been studied that bronchoscope diameter plays an important role in airway flow obstruction in intubated patients.Without the orotracheal tube the bronchoscope only occupies 10% of the trachea. The internal diameter of the endotracheal tube influences the size of the bronchoscope.

In order to maintain the adequate minute volume and to minimize barotrauma it is recommended to use an endotracheal tube with a probe diameter of at least 2 mm larger than the bronchoscope diameter. An adult bronchoscope of 5.7 mm occupies 40% of the orotracheal lumen in a 9 mm endotracheal tube, which equals 51% and 66% of the lumen for 8 and 7 mm respectively. Use of a narrow bronchoscope may avoid the risk of barotrauma but has the disadvantage of less suction capacity through the bronchoscope channel.

Despite all these factors fiberoptic bronchoscopy is considered a safe procedure; patients admitted in the Intensive Care Unit should be considered at high risk from complications when undergoing fiberoptic bronchoscopy.Several recommendations must to be applied to guarantee the security of the technique and improve patient safety.

In mechanically ventilated patients bronchoscopy is performed through the endotracheal or tracheotomy tube by means of a specially adapted valve that facilitates the introduction of the bronchoscope into the airway without disconnection of mechanical ventilation. The adapter connects the endotracheal tube with the ventilator circuit and has a side port to allow entry of the bronchoscope into the endotracheal tube without disrupting the ongoing mechanical ventilation (figure 1).This valve allows continued ventilation and maintenance of PEEP during the technique.This is especially important in patients with adult respiratory

Fig. 1. Adapted valve to perform bronchoscopy in mechanically ventilated patients.

but has the disadvantage of less suction capacity through the bronchoscope channel.

guarantee the security of the technique and improve patient safety.

It has been studied that bronchoscope diameter plays an important role in airway flow obstruction in intubated patients.Without the orotracheal tube the bronchoscope only occupies 10% of the trachea. The internal diameter of the endotracheal tube influences the

In order to maintain the adequate minute volume and to minimize barotrauma it is recommended to use an endotracheal tube with a probe diameter of at least 2 mm larger than the bronchoscope diameter. An adult bronchoscope of 5.7 mm occupies 40% of the orotracheal lumen in a 9 mm endotracheal tube, which equals 51% and 66% of the lumen for 8 and 7 mm respectively. Use of a narrow bronchoscope may avoid the risk of barotrauma

Despite all these factors fiberoptic bronchoscopy is considered a safe procedure; patients admitted in the Intensive Care Unit should be considered at high risk from complications when undergoing fiberoptic bronchoscopy.Several recommendations must to be applied to

**2. Procedure in mechanically ventilated patients** 

distress syndrome.

size of the bronchoscope.

In mechanically ventilated patients several considerations (table 1) are recommended during the peribronchoscopy period to ensure the maintenance of adequate ventilation and oxygenation while minimizing the risk of barotrauma. Continuous physiological monitoring must be continued during and after the procedure. During the bronchoscopy exhaustive ventilator parameter monitoring is required to take care to maintain tidal volume and to control airway pressures. Continuous haemodynamic monitoring with heart rate, arterial pressure and oximetry is mandatory.


Table 1. Recommendations to perform bronchoscopy in mechanically ventilated patients.

Prior to and during fiberoptic bronchoscopy inspired fraction of oxygen (FiO2) must be increased to 1 and following the procedure the FiO2 will be adjusted according to the clinical situation of the patient. Pressure-control mode has demonstrated to deliver a greater baseline volume than volume- control mode in a lung model; careful readjustment of the inspiratory pressure level is necessary in Pressure-control mode to maximize exhaled tidal volume. Finally inspiratory pressure level must be reduced to pre-procedure values when the bronchoscope is removed. Effects of fiberoptic bronchoscopy on the respiratory function have been amply analyzed in patients with spontaneous breathing but in mechanically ventilated patients has been scarcely studied. Recently it was documented in a study to analyze the effects on respiratory mechanics of flexible bronchoscopy in mechanically ventilated patients. A transitory deterioration of pulmonary mechanics with a decrease of respiratory system compliance and an increase in airway resistance was observed in fifty mechanically ventilated patients after bronchoscopy with bronchoalveolar lavage (Estella,2010).

Sedation and muscle relaxation may be necessary during the procedure to prevent barotrauma caused by airway irritation reflex and cough; although critically ill patients may be heavily sedated we recommend short-acting benzodiazepines.

Flexible bronchoscopy is an invasive procedure and therefore needs documented informed consent from the patient or legal representative if the patient lacks medical decision-making capacity.

Bronchoscopy in Mechanically Ventilated Patients 95

introduction of antibiotics reduce the diagnostic yield of respiratory samples and empiric

Despite prior antibiotic therapy bronchoalveolar lavage is a useful diagnostic tool in immunocompromised patients. In ventilator associated pneumonia, in spite of the number of studies carried out, the diagnosis of pneumonia during mechanical ventilation is still disputed. Actually there are two diagnostic strategies: the "non-invasive" strategy, based on clinical criteria and a culture of secretions from upper airways (Heyland, 2006), and the "invasive" strategy, based on the use of flexible bronchoscopy for microbiological diagnosis using quantitative cultures from samples obtained selectively from the affected area (Fagon,2000). This particular strategy is recommended in the clinical guidelines of leading scientific societies for diagnosing ventilator-associated pneumonia like the American Thoracic Society, yet is one of the diagnostic methods least used in Europe, the tracheal aspirate was the most frequent diagnostic sample used in twenty-seven intensive care units

The strengths and weaknesses of the use of bronchoscopy comparing with the clinical strategy based in tracheal aspirate samples are shown in Table 3. The explanations for the low use of fiberoptic bronchoscopy in Intensive Care Unit for pneumonia diagnosis are probably the lack of experienced personnel , procedure time spent compared with other samples like tracheal aspirate and the lack of a definitive well designed study that

definitively define a gold standard for the diagnosis of pneumonia.

Table 3. Strengths and weaknesses of bronchoscopy for pneumonia diagnosis.

The year 2009 was characterized in worldwide Intensive Care Units by the Influenza A (H1N1)v pandemic. Initially bronchoscopy was not routinely recommended to obtain respiratory samples for the Influenza A (H1N1)v pneumonia due to critically ill patients presenting with severe hypoxemia and for the risk of generating aerosol. Interestingly bronchoalveolar lavage was described in a short series of patients as a useful diagnostic method in patients with false negatives obtained by upper airway respiratory samples (ANZIC influenza investigators,2009). Future studies are necessary for determining the role of bronchoscopy in the diagnosis of Influenza A (H1N1)v pneumonia. We proposed a diagnostic algorithm with the recommendation to perform bronchoscopic bronchoalveolar lavage in cases with a high clinical suspicion and negative microbiologic results of samples


obtained from upper respiratory airway (Estella, 2010).


treatment is usually administered in a previous admission in the Intensive Care Unit.

of nine european countries (Koulenti,2009).

Advantages



Disadvantages



#### **3. Fiberoptic bronchoscopy indications in an Intensive Care Unit**

Flexible fiberoptic bronchoscopy is an essential diagnostic and therapeutic tool for management of critically ill patients. The present chapter summarizes the indications of these procedures in the Intensive Care Unit; many indications require both diagnostic and therapeutic objectives simultaneously. It is currently a usual procedure in mechanically ventilated patients. Table 2 summarizes the indications of flexible bronchoscopy in this group of patients.


Table 2. Indications for bronchoscopy in mechanically ventilated patients.

#### **3.1 Pneumonia diagnosis in mechanically ventilated patients**

The most frequent diagnostic indication of flexible bronchoscopy in mechanically ventilated patients is to collect samples for microbiological analysis in patients with suspected pneumonia.

Pneumonia is the most frequent nosocomial infection occurring in critically ill patients in the Intensive Care Unit and is associated with a high mortality rate, prolonged mechanical ventilation and intensive care unit stay. It is associated with a high cost due to extended hospital stay and a greater consumption of antimicrobial agents. It is necessary to distinguish three kinds of pneumonia in mechanically ventilated patients to analyze the role of flexible bronchoscopy: community acquired pneumonia, ventilator associated pneumonia and pneumonia in immunocompromised patients.

In Europe, only in half of patients with community acquired pneumonia requiring hospitalization etiological diagnosis is finally known (Woodhead M, 2002). Streptococcus pneumoniae is the most frequent etiologic cause. In community acquired pneumonia invasive techniques are not usually indicated. It is recommended in cases with fulminant evolution or cases without adequate response to empirical antibiotics. In an analysis of the role of bronchoalveolar lavage in 96 mechanically ventilated patients the group with community acquired pneumonia had the lower diagnostic yield compared with ventilator associated pneumonia and immunocompromised patients (Estella, 2008). Our hypothesis is that recent

Flexible fiberoptic bronchoscopy is an essential diagnostic and therapeutic tool for management of critically ill patients. The present chapter summarizes the indications of these procedures in the Intensive Care Unit; many indications require both diagnostic and therapeutic objectives simultaneously. It is currently a usual procedure in mechanically ventilated patients. Table 2 summarizes the indications of flexible bronchoscopy in this


The most frequent diagnostic indication of flexible bronchoscopy in mechanically ventilated patients is to collect samples for microbiological analysis in patients with suspected

Pneumonia is the most frequent nosocomial infection occurring in critically ill patients in the Intensive Care Unit and is associated with a high mortality rate, prolonged mechanical ventilation and intensive care unit stay. It is associated with a high cost due to extended hospital stay and a greater consumption of antimicrobial agents. It is necessary to distinguish three kinds of pneumonia in mechanically ventilated patients to analyze the role of flexible bronchoscopy: community acquired pneumonia, ventilator associated pneumonia

In Europe, only in half of patients with community acquired pneumonia requiring hospitalization etiological diagnosis is finally known (Woodhead M, 2002). Streptococcus pneumoniae is the most frequent etiologic cause. In community acquired pneumonia invasive techniques are not usually indicated. It is recommended in cases with fulminant evolution or cases without adequate response to empirical antibiotics. In an analysis of the role of bronchoalveolar lavage in 96 mechanically ventilated patients the group with community acquired pneumonia had the lower diagnostic yield compared with ventilator associated pneumonia and immunocompromised patients (Estella, 2008). Our hypothesis is that recent

**3. Fiberoptic bronchoscopy indications in an Intensive Care Unit** 


Table 2. Indications for bronchoscopy in mechanically ventilated patients.

**3.1 Pneumonia diagnosis in mechanically ventilated patients** 

and pneumonia in immunocompromised patients.


group of patients.



pneumonia.


immunocompromised patients.


Despite prior antibiotic therapy bronchoalveolar lavage is a useful diagnostic tool in immunocompromised patients. In ventilator associated pneumonia, in spite of the number of studies carried out, the diagnosis of pneumonia during mechanical ventilation is still disputed. Actually there are two diagnostic strategies: the "non-invasive" strategy, based on clinical criteria and a culture of secretions from upper airways (Heyland, 2006), and the "invasive" strategy, based on the use of flexible bronchoscopy for microbiological diagnosis using quantitative cultures from samples obtained selectively from the affected area (Fagon,2000). This particular strategy is recommended in the clinical guidelines of leading scientific societies for diagnosing ventilator-associated pneumonia like the American Thoracic Society, yet is one of the diagnostic methods least used in Europe, the tracheal aspirate was the most frequent diagnostic sample used in twenty-seven intensive care units of nine european countries (Koulenti,2009).

The strengths and weaknesses of the use of bronchoscopy comparing with the clinical strategy based in tracheal aspirate samples are shown in Table 3. The explanations for the low use of fiberoptic bronchoscopy in Intensive Care Unit for pneumonia diagnosis are probably the lack of experienced personnel , procedure time spent compared with other samples like tracheal aspirate and the lack of a definitive well designed study that definitively define a gold standard for the diagnosis of pneumonia.

#### Advantages


#### Disadvantages


Table 3. Strengths and weaknesses of bronchoscopy for pneumonia diagnosis.

The year 2009 was characterized in worldwide Intensive Care Units by the Influenza A (H1N1)v pandemic. Initially bronchoscopy was not routinely recommended to obtain respiratory samples for the Influenza A (H1N1)v pneumonia due to critically ill patients presenting with severe hypoxemia and for the risk of generating aerosol. Interestingly bronchoalveolar lavage was described in a short series of patients as a useful diagnostic method in patients with false negatives obtained by upper airway respiratory samples (ANZIC influenza investigators,2009). Future studies are necessary for determining the role of bronchoscopy in the diagnosis of Influenza A (H1N1)v pneumonia. We proposed a diagnostic algorithm with the recommendation to perform bronchoscopic bronchoalveolar lavage in cases with a high clinical suspicion and negative microbiologic results of samples obtained from upper respiratory airway (Estella, 2010).

Bronchoscopy in Mechanically Ventilated Patients 97

in 24 hours in an isolated episode. In patients with haemoptysis, flexible bronchoscopy is a useful tool for locating the point of bleeding and also for administering through the bronchoscopic channel cold saline solution and adrenaline 1:10000 to control haemorrhaging. Haemoptysis is one of the commonest situations for which emergency

In cases of life-threatening haemoptysis in intubated patients and in distal locations, flexible bronchoscopy has been shown to be useful, with reports of cases of unrelenting haemorrhage where the source of bleeding has been plugged using a Fogarty catheter placed through the aspiration channel of the endoscope (Gottlieb LS,1975). Likewise, cases have been documented in which plugging was performed using the same technique described, but with a Swan-Ganz catheter. Flexible bronchoscopy can help position doublelumen endotracheal tubes for pulmonary isolation and selective ventilation in cases of massive unilateral haemoptysis. Recently a new way of administration of drugs has been described where a good response to intrapulmonary treatment with activated recombinant factor VII instilled through the channel of the bronchoscope in cases of diffuse alveolar

Patients with chest trauma present potential risk of lesions of the bronchial tree. Sometimes several lesions are not clinically evident and flexible bronchoscopy may be indicated to explore the airway and respiratory tract. It can be useful in diagnosis by enabling direct endoscopic visualisation of tracheal lacerations, bronchial transection or lacerations at any point of the bronchial tree, haemorrhage, contusions of the mucous membrane or aspirated

Percutaneous tracheostomy is a simple bedside procedure frequently used in Intensive Care Units, it is considered as the airway management of choice for patients with prolonged mechanical ventilation requirements. The procedure is associated with a low complication rate. It does have a few, but potentially life-threatening, complications like creation of a false airway, pneumothorax, subcutaneous emphysema, tracheoesophageal fistula. These complications are mainly associated with failure to visualise the area during

Bronchoscopic control with direct visualization minimises the complications associated with the procedure.It is recommended particularly in patients with anatomically difficult

Figure 3 shows the different steps of the percutaneous tracheostomy technique and their endoscopic visualization. 1: advancement of the needle until free withdrawal of air into the fluid filled syringe and bronchoscopic visualization confirming the entry of the needle and cannula into the trachea; 2: a) introduction of the guide-wire, b) predilation, passing of the pre-dilator over the guide wire penetrating soft tissues and tracheal wall; 3: tracheal dilation, advancing the guide wire dilating forceps over the guide wire and opening of the forceps to dilate tracheal wall in order to accept the tracheotomy tube; 4: tube insertion,

endoscopic image of the advancement of the tracheotomy tube into the trachea.

haemorrhage has been documented (Heslet, 2006; Estella,2008).

**3.5 Percutaneous tracheostomy control** 

bronchoscopy is indicated.

**3.4 Chest trauma** 

material.

the technique.

necks.

#### **3.2 Atelectasis**

Atelectasis and retention of secretions are common complications in critically ill patients. They usually present with excess airway secretions or inability to generate a cough. Frequently it is due to postoperative state, prolonged mechanical ventilation or sedation. Atelectasis is one of the most frequent therapeutic indications for flexible fiberoptic bronchoscopy in the Intensive Care Unit. For this use the size of the bronchoscope is important as efficient suctioning requires a large bronchoscope with a wide suction channel. In adult mechanically ventilated patients paediatric bronchoscopes are not recommended for this indication.

But the effectiveness of bronchoscopy to resolve it is the subject of controversy. A systematic review of several publications (Kreider, 2003) finding important differences in the effectiveness of flexible bronchoscopy: from 19% to 89%, with the best results found in lobar atelectasis caused by a central mucous plug, and the worst in subsegmental atelectasis. Figure 2 shows the sequence of endoscopic images of a central mucous plug located in the right main stem (1,2,3) and its resolution with the aspiration through the suction channel (4,5,6). Marini et al compared the use of flexible bronchoscopy with intense respiratory physiotherapy for treating atelectasis and found no differences in either group, attributing, in this study, delayed resolution to the presence of air bronchograms in the chest x-ray (Marini, 1979).

Fig. 2. Endoscopic image of a central mucous plug located in the right main stem and its resolution.

#### **3.3 Hemoptysis**

Rigid bronchoscopy is the procedure of choice for acute life-threatening haemoptysis, defined as the expectoration of more that 600 ml of blood over a 48 hour period, or of 400 ml in 24 hours in an isolated episode. In patients with haemoptysis, flexible bronchoscopy is a useful tool for locating the point of bleeding and also for administering through the bronchoscopic channel cold saline solution and adrenaline 1:10000 to control haemorrhaging. Haemoptysis is one of the commonest situations for which emergency bronchoscopy is indicated.

In cases of life-threatening haemoptysis in intubated patients and in distal locations, flexible bronchoscopy has been shown to be useful, with reports of cases of unrelenting haemorrhage where the source of bleeding has been plugged using a Fogarty catheter placed through the aspiration channel of the endoscope (Gottlieb LS,1975). Likewise, cases have been documented in which plugging was performed using the same technique described, but with a Swan-Ganz catheter. Flexible bronchoscopy can help position doublelumen endotracheal tubes for pulmonary isolation and selective ventilation in cases of massive unilateral haemoptysis. Recently a new way of administration of drugs has been described where a good response to intrapulmonary treatment with activated recombinant factor VII instilled through the channel of the bronchoscope in cases of diffuse alveolar haemorrhage has been documented (Heslet, 2006; Estella,2008).

#### **3.4 Chest trauma**

96 Global Perspectives on Bronchoscopy

Atelectasis and retention of secretions are common complications in critically ill patients. They usually present with excess airway secretions or inability to generate a cough. Frequently it is due to postoperative state, prolonged mechanical ventilation or sedation. Atelectasis is one of the most frequent therapeutic indications for flexible fiberoptic bronchoscopy in the Intensive Care Unit. For this use the size of the bronchoscope is important as efficient suctioning requires a large bronchoscope with a wide suction channel. In adult mechanically ventilated patients paediatric bronchoscopes are not recommended

But the effectiveness of bronchoscopy to resolve it is the subject of controversy. A systematic review of several publications (Kreider, 2003) finding important differences in the effectiveness of flexible bronchoscopy: from 19% to 89%, with the best results found in lobar atelectasis caused by a central mucous plug, and the worst in subsegmental atelectasis. Figure 2 shows the sequence of endoscopic images of a central mucous plug located in the right main stem (1,2,3) and its resolution with the aspiration through the suction channel (4,5,6). Marini et al compared the use of flexible bronchoscopy with intense respiratory physiotherapy for treating atelectasis and found no differences in either group, attributing, in this study, delayed resolution to the presence of air bronchograms in the chest x-ray

Fig. 2. Endoscopic image of a central mucous plug located in the right main stem and its

Rigid bronchoscopy is the procedure of choice for acute life-threatening haemoptysis, defined as the expectoration of more that 600 ml of blood over a 48 hour period, or of 400 ml

**3.2 Atelectasis** 

for this indication.

(Marini, 1979).

resolution.

**3.3 Hemoptysis** 

Patients with chest trauma present potential risk of lesions of the bronchial tree. Sometimes several lesions are not clinically evident and flexible bronchoscopy may be indicated to explore the airway and respiratory tract. It can be useful in diagnosis by enabling direct endoscopic visualisation of tracheal lacerations, bronchial transection or lacerations at any point of the bronchial tree, haemorrhage, contusions of the mucous membrane or aspirated material.

#### **3.5 Percutaneous tracheostomy control**

Percutaneous tracheostomy is a simple bedside procedure frequently used in Intensive Care Units, it is considered as the airway management of choice for patients with prolonged mechanical ventilation requirements. The procedure is associated with a low complication rate. It does have a few, but potentially life-threatening, complications like creation of a false airway, pneumothorax, subcutaneous emphysema, tracheoesophageal fistula. These complications are mainly associated with failure to visualise the area during the technique.

Bronchoscopic control with direct visualization minimises the complications associated with the procedure.It is recommended particularly in patients with anatomically difficult necks.

Figure 3 shows the different steps of the percutaneous tracheostomy technique and their endoscopic visualization. 1: advancement of the needle until free withdrawal of air into the fluid filled syringe and bronchoscopic visualization confirming the entry of the needle and cannula into the trachea; 2: a) introduction of the guide-wire, b) predilation, passing of the pre-dilator over the guide wire penetrating soft tissues and tracheal wall; 3: tracheal dilation, advancing the guide wire dilating forceps over the guide wire and opening of the forceps to dilate tracheal wall in order to accept the tracheotomy tube; 4: tube insertion, endoscopic image of the advancement of the tracheotomy tube into the trachea.

Fig. 3. Bronchoscopic images of different steps of percutaneous tracheostomy technique.

The availability of flexible bronchoscopy in the Intensive Care Unit is essential for management of so called "difficult airways", although the indication is seen in fewer than 1% of all bronchoscopies performed in critically ill patients. This low percentage may be due to the fact that experience is required to perform the procedure and to the emergence of more easily managed devices for treatment of difficult airways, such as the Combitube, the laryngeal mask and Fastrack mask, which are increasingly used. Really, flexible

**3.6 Management of difficult airway** 

Fig. 3. Bronchoscopic images of different steps of percutaneous tracheostomy technique.

#### **3.6 Management of difficult airway**

The availability of flexible bronchoscopy in the Intensive Care Unit is essential for management of so called "difficult airways", although the indication is seen in fewer than 1% of all bronchoscopies performed in critically ill patients. This low percentage may be due to the fact that experience is required to perform the procedure and to the emergence of more easily managed devices for treatment of difficult airways, such as the Combitube, the laryngeal mask and Fastrack mask, which are increasingly used. Really, flexible

Bronchoscopy in Mechanically Ventilated Patients 101

Hypercapnia may be due to hypoventilation during the procedure and the monitoring of the tidal volume is necessary to ensure the maintenance of adequate ventilation; sedation

Bleeding of the mucous membrane occurs uncommonly during flexible bronchoscopy and is rarely harmful and usually transitory with spontaneous resolution.Patients with coagulation disorders or thrombocytopenia have high risk for bleeding. Transbronchial biopsy or brushing has more risk than bronchoalveolar lavage for bleeding with these conditions.

Pneumothorax has been documented especially when a biopsy or brush is performed while with other procedures like bronchoalveolar lavage the incidence is less than 1% (Hertz MI,

Laryngospasm and bronchospasm rarely occurs after flexible bronchoscopy in mechanically

Recently we have documented the effects in respiratory mechanics with bronchoscopic bronchoalveolar lavage in mechanically ventilated patients; we conducted a study in mechanically ventilated patients observing a transitory deterioration of the respiratory mechanics with a decrease of respiratory compliance and an increase in airway resistance

and supplemental oxygen must be used with caution.

1991).

ventilated patients.

(Estella A, 2010).



in critically ill patients.



Table 4. Complications of bronchoscopy in mechanically ventilated patients.

Until now we have commented on complications during flexible bronchoscopy. Complications developing in the hours after the procedure have been scarcely investigated

Post-bronchoscopy fever has not been much studied in mechanically ventilated patients, although its appearance has been reported in 16% of the patients ( Shennib H, 1996). By contrast, in patients with spontaneous breathing this complication has been sufficiently


Post-bronchoscopy complications.


bronchoscopy is a very useful tool for management of difficult intubation, usually caused by upper airway obstruction, anatomic disorders that reduce visibility of vocal cords and/or mobility of the head and neck like short neck, protruding incisor teeth or long high arched palate. Moreover in severe bleeding which makes laryngoscope intubation more risky, bronchoscopy is recommended. Finally it should be noted that bronchoscopyic endotracheal intubation is contraindicated in apnoeic patients. The oral route is preferred than nasal because of avoiding damage to the nasal mucosa and further nosocomial sinusitis. Moreover it allows intubation with an endotracheal tube with a larger diameter.

Other indication is for changing the endotracheal tube in patients with an expected difficult intubation. The new endotracheal tube is inserted over the bronchoscope and it is passed into the trachea by going outside parallel to the old endotracheal tube after deflation of the old endotracheal tube cuff.

#### **3.7 Extracting foreign body**

For extracting foreign bodies, the procedure of choice is the rigid bronchoscope, although flexible bronchoscopy using specialised instruments like hooks, Dormia baskets or biopsy forceps is also possible.

#### **3.8 Other indications**

A further use of flexible bronchoscopy is to correctly place double-lumen endotracheal tubes for selective ventilation in cases of massive haemoptysis or bronchopleural fistulas.

In patients who present with acute inhalation injury and burns flexible bronchoscopy is indicated to identify the anatomic level of the injury.

Assessment of glottis damage may be necessary in patients with prolonged mechanical ventilation.Flexible bronchoscopy is indicated to evaluate suspected neoplastic mass and for initiation of independent lung ventilation.

#### **4. Complications of flexible bronchoscopy in mechanically ventilated patients**

Taking into account recommendations commented in table 1 flexible bronchoscopy is an extremely safe procedure, if it is performed by a trained specialist.In mechanically ventilated patients it is easier to perform than in spontaneous breathing, as there is no upper airway to traverse. The risk of major complications in Intensive Care Unit is less than 1% and mortality related with the procedure is less than a 1%. Minor complications (table 4) have been associated with the procedure and occur in the first 24 hours within the procedure.

Cardiac arrhythmias, mainly supraventricular tachycardia are more like to occur in critically ill patients.Hypoxemia and insufficient sedation are associated with this complication and patients with cardiovascular disease are at highest risk for this complication.

Hypoxemia is common in mechanically ventilated patients undergoing flexible bronchoscopy, especially in patients with acute respiratory distress syndrome (ARDS).Continuous pulse oximeter during the procedure is recommended, and if a relevant decrease of oxygen saturation is observed the procedure must to be stopped.

bronchoscopy is a very useful tool for management of difficult intubation, usually caused by upper airway obstruction, anatomic disorders that reduce visibility of vocal cords and/or mobility of the head and neck like short neck, protruding incisor teeth or long high arched palate. Moreover in severe bleeding which makes laryngoscope intubation more risky, bronchoscopy is recommended. Finally it should be noted that bronchoscopyic endotracheal intubation is contraindicated in apnoeic patients. The oral route is preferred than nasal because of avoiding damage to the nasal mucosa and further nosocomial sinusitis. Moreover

Other indication is for changing the endotracheal tube in patients with an expected difficult intubation. The new endotracheal tube is inserted over the bronchoscope and it is passed into the trachea by going outside parallel to the old endotracheal tube after deflation of the

For extracting foreign bodies, the procedure of choice is the rigid bronchoscope, although flexible bronchoscopy using specialised instruments like hooks, Dormia baskets or biopsy

A further use of flexible bronchoscopy is to correctly place double-lumen endotracheal tubes

In patients who present with acute inhalation injury and burns flexible bronchoscopy is

Assessment of glottis damage may be necessary in patients with prolonged mechanical ventilation.Flexible bronchoscopy is indicated to evaluate suspected neoplastic mass and for

Taking into account recommendations commented in table 1 flexible bronchoscopy is an extremely safe procedure, if it is performed by a trained specialist.In mechanically ventilated patients it is easier to perform than in spontaneous breathing, as there is no upper airway to traverse. The risk of major complications in Intensive Care Unit is less than 1% and mortality related with the procedure is less than a 1%. Minor complications (table 4) have been

Cardiac arrhythmias, mainly supraventricular tachycardia are more like to occur in critically ill patients.Hypoxemia and insufficient sedation are associated with this complication and

Hypoxemia is common in mechanically ventilated patients undergoing flexible bronchoscopy, especially in patients with acute respiratory distress syndrome (ARDS).Continuous pulse oximeter during the procedure is recommended, and if a relevant

for selective ventilation in cases of massive haemoptysis or bronchopleural fistulas.

**4. Complications of flexible bronchoscopy in mechanically ventilated** 

associated with the procedure and occur in the first 24 hours within the procedure.

patients with cardiovascular disease are at highest risk for this complication.

decrease of oxygen saturation is observed the procedure must to be stopped.

indicated to identify the anatomic level of the injury.

initiation of independent lung ventilation.

it allows intubation with an endotracheal tube with a larger diameter.

old endotracheal tube cuff.

**3.7 Extracting foreign body** 

forceps is also possible.

**3.8 Other indications** 

**patients** 

Hypercapnia may be due to hypoventilation during the procedure and the monitoring of the tidal volume is necessary to ensure the maintenance of adequate ventilation; sedation and supplemental oxygen must be used with caution.

Bleeding of the mucous membrane occurs uncommonly during flexible bronchoscopy and is rarely harmful and usually transitory with spontaneous resolution.Patients with coagulation disorders or thrombocytopenia have high risk for bleeding. Transbronchial biopsy or brushing has more risk than bronchoalveolar lavage for bleeding with these conditions.

Pneumothorax has been documented especially when a biopsy or brush is performed while with other procedures like bronchoalveolar lavage the incidence is less than 1% (Hertz MI, 1991).

Laryngospasm and bronchospasm rarely occurs after flexible bronchoscopy in mechanically ventilated patients.

Recently we have documented the effects in respiratory mechanics with bronchoscopic bronchoalveolar lavage in mechanically ventilated patients; we conducted a study in mechanically ventilated patients observing a transitory deterioration of the respiratory mechanics with a decrease of respiratory compliance and an increase in airway resistance (Estella A, 2010).


Table 4. Complications of bronchoscopy in mechanically ventilated patients.

Post-bronchoscopy complications.

Until now we have commented on complications during flexible bronchoscopy. Complications developing in the hours after the procedure have been scarcely investigated in critically ill patients.

Post-bronchoscopy fever has not been much studied in mechanically ventilated patients, although its appearance has been reported in 16% of the patients ( Shennib H, 1996). By contrast, in patients with spontaneous breathing this complication has been sufficiently

Bronchoscopy in Mechanically Ventilated Patients 103

Although cardiac ischemia is supposed to increase the risk of flexible bronchoscopy there is no clear data in the literature supporting this consideration. In critically ill patients the risk

Flexible bronchoscopy must be an essential piece of Intensive Care Unit equipment; it is a safe and useful procedure for the management of several pulmonary disorders in

It is relatively easy to perform at the bedside and clinicians trained in its use are necessary in the Intensive Care Unit. This valuable procedure should be available to perform urgently for

The following features attest to the increasing use of flexible bronchoscopy in mechanically ventilated patients: proven useful for a wide range of respiratory diseases in critically ill patients, easy to achieve at the bedside avoiding potentially dangerous transfers out of the Intensive Care Unit, relatively inexpensive clinical tool, demonstrated safely of the procedure described with careful preparation and close monitoring in selected patients and

Álvarez-Lerma F, Álvarez-Sánchez B, Barcenilla F. Protocolo diagnóstico y terapéutico de la

American Thoracic Society Documents. Guidelines for the management of adults with

Barba CA, Angood PB, Kauder DR, Latenser B, Martin K, McGonigal MD, et al.

Bauer TT, Arosio C, Monton C, Filella X, Xaubet A, Torres A. Systemic inflammatory

British Thoracic Society Guidelines on diagnostic flexible bronchoscopy. Thorax

Butler KH, Clyne B. Management of the difficult airway: alternative airway techniques and

Davis KA. Ventilator-Associated Pneumonia: a review. J Intensive Care Med 2006;21:211-26. Dellinger RP, Bandi V. Fiberoptic bronchoscopy in the intensive care unit. Crit Care Clin

Dupree HJ, Lewejohann JC, Gleiss J, Muhl E, Bruch HP. Fiberoptic bronchoscopy of intubated patients with life-threatening hemoptysis. World J Surg 2001;25:104-7. Estella A, Jareño A, Pérez Bello Fontaiña L. Intrapulmonary administration of recombinant

activated factor VII in diffuse alveolar haemorrhage: a report of two case stories.

effective,and easy-to-teach procedure. Surgery 1995;118:879-83.

response after bronchoalveolar lavage in critically ill patients.

neumonía asociada a ventilación mecánica. Guía de práctica clínica en medicina intensiva. Sociedad Española de Medicina Intensiva y Unidades Coronarias.

hospital-acquired, ventilator-associated, and health care-associated pneumonia.

Bronchoscopic guidance makes percutaneous tracheostomy a safe,cost-

for developing cardiac arrhythmias is increased.

a wide range of therapeutic and diagnostic indications.

Barcelona: Meditex, 1996; 1-8.

Eur Respir J 2001;17:274-80.

Case J. 2008 Sep 12;1(1):150.

2001;56:(Supl 1):1-21.

1992; 8:755-72.

Am J Respir Crit Care Med 2005;171:388-416.

adjuncts. Emerg Med Clin North Am 2003;21:259.

**6. Final considerations** 

mechanically ventilated patients.

few relative contraindications.

**7. References** 

documented as self-limited in 24 hours with an incidence between 6 to 19% of the cases. In a large series of 518 patients (Um SW,2004), 5% had post-bronchoscopy fever.It was not demonstrated to be related with bacteremia. A significant increase of leukocytes and neutrophils were observed. The combination of leukocytosis, fever and negative blood cultures supports the theory that fever is due to a systemic inflammatory response; a possible mechanism involves the activation of lung macrophages on contact with the liquid instilled with the bronchoalveolar lavage, which causes a release of proinflammatory mediators into the circulation and thereby triggers a systemic inflammatory response. In mechanically ventilated patients complications in the hours following the procedure has been scarcely investigated. A rise in temperature three hours after and a significant decrease of the arterial pressure five hours after flexible bronchoscopy was documented in patients with pneumonia in a series of 34 procedures in 25 intubated patients (Pugin J,1992). Only one study, (Bauer, 2001), has investigated the cytokine inflammatory response after bronchoalveolar lavage in 30 mechanically ventilated patients. They did not find differences in cytokine concentrations 12 and 24 hours after the procedure.

#### **5. Contraindications to flexible bronchoscopy in mechanically ventilated patients**

With adequate training and experienced operators flexible bronchoscopy has few if any absolute contraindications. It is mandatory to have careful patient selection, identifying the situations in which the clinical conditions and/or haemodynamic status do not guarantee the completion of the bronchoscopy safely.The inability to adequately oxygenate or ventilate increase the risk of bronchoscopy in mechanically ventilated patients.The clinical conditions in which the risk in performing a flexible bronchoscopy is increased are cited in the table 5.

Conditions cited in table 5 are relative contraindications because if they are normalized flexible bronchoscopy can be performed.

Even in paralyzed patients increase of intracranial pressure occurs. In patients with increased intracranial pressure it is mandatory to perform the procedure with deep sedation and paralysis with muscle relaxation and continous monitoring of cerebral hemodynamics.

Endotracheal tube with an internal diameter less than 8 mm with a standard adult bronchoscope (5.8mm).

Presence of pneumothorax on chest radiograph.

Oxygen saturation below 90% with FiO2 of 1.

Active bronchospasm.

Severe acidosis, Ph<7,2.

Haemodynamic instability, defined by systolic blood pressure <90 mmHg despite vasoactive drugs.

Unstable arrhythmia.

Coagulation disorders with indications for brush or biopsy.

Increased intracranial pressure.

Table 5. Conditions of increased risk of bronchoscopy in mechanically ventilated patients.

Although cardiac ischemia is supposed to increase the risk of flexible bronchoscopy there is no clear data in the literature supporting this consideration. In critically ill patients the risk for developing cardiac arrhythmias is increased.

#### **6. Final considerations**

102 Global Perspectives on Bronchoscopy

documented as self-limited in 24 hours with an incidence between 6 to 19% of the cases. In a large series of 518 patients (Um SW,2004), 5% had post-bronchoscopy fever.It was not demonstrated to be related with bacteremia. A significant increase of leukocytes and neutrophils were observed. The combination of leukocytosis, fever and negative blood cultures supports the theory that fever is due to a systemic inflammatory response; a possible mechanism involves the activation of lung macrophages on contact with the liquid instilled with the bronchoalveolar lavage, which causes a release of proinflammatory mediators into the circulation and thereby triggers a systemic inflammatory response. In mechanically ventilated patients complications in the hours following the procedure has been scarcely investigated. A rise in temperature three hours after and a significant decrease of the arterial pressure five hours after flexible bronchoscopy was documented in patients with pneumonia in a series of 34 procedures in 25 intubated patients (Pugin J,1992). Only one study, (Bauer, 2001), has investigated the cytokine inflammatory response after bronchoalveolar lavage in 30 mechanically ventilated patients. They did not find differences

**5. Contraindications to flexible bronchoscopy in mechanically ventilated** 

With adequate training and experienced operators flexible bronchoscopy has few if any absolute contraindications. It is mandatory to have careful patient selection, identifying the situations in which the clinical conditions and/or haemodynamic status do not guarantee the completion of the bronchoscopy safely.The inability to adequately oxygenate or ventilate increase the risk of bronchoscopy in mechanically ventilated patients.The clinical conditions in which the risk in performing a flexible bronchoscopy is increased are cited in the table 5. Conditions cited in table 5 are relative contraindications because if they are normalized

Even in paralyzed patients increase of intracranial pressure occurs. In patients with increased intracranial pressure it is mandatory to perform the procedure with deep sedation and paralysis with muscle relaxation and continous monitoring of cerebral hemodynamics.

Endotracheal tube with an internal diameter less than 8 mm with a standard adult

Haemodynamic instability, defined by systolic blood pressure <90 mmHg despite

Table 5. Conditions of increased risk of bronchoscopy in mechanically ventilated patients.

in cytokine concentrations 12 and 24 hours after the procedure.

flexible bronchoscopy can be performed.

Presence of pneumothorax on chest radiograph. Oxygen saturation below 90% with FiO2 of 1.

Coagulation disorders with indications for brush or biopsy.

bronchoscope (5.8mm).

Active bronchospasm. Severe acidosis, Ph<7,2.

Increased intracranial pressure.

vasoactive drugs. Unstable arrhythmia.

**patients** 

Flexible bronchoscopy must be an essential piece of Intensive Care Unit equipment; it is a safe and useful procedure for the management of several pulmonary disorders in mechanically ventilated patients.

It is relatively easy to perform at the bedside and clinicians trained in its use are necessary in the Intensive Care Unit. This valuable procedure should be available to perform urgently for a wide range of therapeutic and diagnostic indications.

The following features attest to the increasing use of flexible bronchoscopy in mechanically ventilated patients: proven useful for a wide range of respiratory diseases in critically ill patients, easy to achieve at the bedside avoiding potentially dangerous transfers out of the Intensive Care Unit, relatively inexpensive clinical tool, demonstrated safely of the procedure described with careful preparation and close monitoring in selected patients and few relative contraindications.

#### **7. References**


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Olaechea PM, Ulibarrena MA, Álvarez-Lerma F, Insausti J, Palomar M, de la Cal MA.

Olopade CO, Prakash UB. Bronchoscopy in the critical care unit. Mayo Clin Proc

Olopade CO, Prakash UB. Bronchoscopy in the critical care unit. Mayo Clin Proc

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Pardon R, Ranic V, Rakaric-Poznanovic M. Bronchoscopy in the diagnosis and therapy of

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Polderman KH, Spijkstra JJ, de Bree R, Christiaans HM, Gelissen HP, Wester JP, et al.

Pugin J, Suter PM. Diagnostic bronchoalveolar lavage in patients with pneumonia produces

Rello J, Ollendorf DA, Oster G, Vera-Llonch M, Bellm L, Redman R et al. Epidemiology and

Richards MJ, Edwards JR, Culver DII, et al. Nosocomial infections in combined medical-

Shennib H, Baslaim G. Bronchoscopy in the intensive care unit. Chest Surg Clin N Am 1996;

Shorr AF, Sherner JH, Jackson WL, Kollef MH. Invasive approaches to the diagnosis of ventilator-associated pneumonia: a meta-analysis. Crit Care Med 2005;33:46-53. Snow.N, Lucas AE. Bronchoscopy in the critically ill surgical patient. Am Surg 1984;50:441-

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The Canadian Critical Care Trial Group. A randomized trial of diagnostic techniques for

Timsit JF, Cheval C, Gachot B, Bruneel F, Wolff M, Carlet J, Regnier B. Usefulness of a

Turner JS, Willcox PA, Hayhurst MD, Potgieter PD. Fiberoptic bronchoscopy in the

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**6** 

*USA* 

**Bronchoscopy in Bronchiectasis** 

Aditya Kasarabada, Mark E. Lund and Jeffrey B. Hoag

Bronchiectasis is a constellation of diseases characterized by abnormally dilated bronchi with thickened bronchial walls due to repeated infection and inflammation. Bronchiectasis causes impairment of mucociliary clearance, airflow limitation, bronchorrhea, and predisposes to recurrent respiratory infections. It has a number of potential underlying causes. Laennec first described bronchiectasis as a distinct clinical entity in 1819 (Barker 2002, O'Donnell 1998). The diagnosis, investigation and particularly management of bronchiectasis has been largely empirical and unfortunately, the subject of relatively few controlled clinical trials. Cystic fibrosis causes about a third of all bronchiectasis in United States (O'Donnell 1998), and is common worldwide. Cystic fibrosis (CF) is a recessive genetic disease characterized by dehydration of the airway surface liquid and impaired mucociliary clearance caused by altered functioning of a chloride channel called the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR). Impaired chloride conductance through the apical portion of airway cells leads to dehydration of airway secretions causing lung destruction through obstruction of the airways with thickened secretions. The resultant endobronchial infection and exaggerated inflammatory response leads to the development of bronchiectasis (destruction and widening of airways) and progressive obstructive airway disease. This chapter provides insight into the specific diagnostic and therapeutic roles of

Bronchiectasis is generally defined as an abnormal and permanent dilatation of the bronchi with thickening of the bronchial wall. In a retrospective cohort study of the insurance claims made in United States, Weycker et al. showed the prevalence of bronchiectasis ranged from 4.2 per 100,000 persons aged 18-34 years to 271.8 per 100,000 among those aged ≥75 years. Prevalence is higher among women than men at all ages (Weycker, D 2005). Bronchiectasis is being recognized with increasing frequency because of the widespread use of highresolution chest computed tomography (HRCT) scanning (Cohen, M 1999). A bronchus is thought to be dilated if on the CT scan the broncho-arterial ratio with the adjacent accompanying artery exceeds 1. There are many causes of bronchiectasis that can be classified as due to anatomic, systemic diseases, congenital, post infectious, or idiopathic

bronchoscopy in patients with bronchiectasis and Cystic Fibrosis.

**2. Overview of bronchiectasis** 

**1. Introduction** 

*Drexel University College of Medicine, Philadelphia, PA* 

**and Cystic Fibrosis** 

*Cancer Treatment Centers of America,* 


### **Bronchoscopy in Bronchiectasis and Cystic Fibrosis**

Aditya Kasarabada, Mark E. Lund and Jeffrey B. Hoag *Cancer Treatment Centers of America, Drexel University College of Medicine, Philadelphia, PA USA* 

#### **1. Introduction**

106 Global Perspectives on Bronchoscopy

Um SW, Choi CM, Lee CT, Kim YW, Han SK, Shim YS, et al. Prospective analysis of clinical characteristics and risk factors of postbronchoscopy fever. Chest 2004;125:945-52. Vincent JL, Bihari DJ, Suter PM, Bruining HA, White J, Nicolas-Chanion MH, et al. The

Woodhead M. Community-acquired pneumonia in Europe: causative pathogens and

resistance patterns. Eur Respir J Suppl. 2002 Jul;36:20s-27s.

274:639-44.

prevalence of nosocomial infection in Intensive Care Units in Europe. Results of the European Prevalence of Infection in Intensive Care (EPIC) study. JAMA 1995;

> Bronchiectasis is a constellation of diseases characterized by abnormally dilated bronchi with thickened bronchial walls due to repeated infection and inflammation. Bronchiectasis causes impairment of mucociliary clearance, airflow limitation, bronchorrhea, and predisposes to recurrent respiratory infections. It has a number of potential underlying causes. Laennec first described bronchiectasis as a distinct clinical entity in 1819 (Barker 2002, O'Donnell 1998). The diagnosis, investigation and particularly management of bronchiectasis has been largely empirical and unfortunately, the subject of relatively few controlled clinical trials. Cystic fibrosis causes about a third of all bronchiectasis in United States (O'Donnell 1998), and is common worldwide. Cystic fibrosis (CF) is a recessive genetic disease characterized by dehydration of the airway surface liquid and impaired mucociliary clearance caused by altered functioning of a chloride channel called the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR). Impaired chloride conductance through the apical portion of airway cells leads to dehydration of airway secretions causing lung destruction through obstruction of the airways with thickened secretions. The resultant endobronchial infection and exaggerated inflammatory response leads to the development of bronchiectasis (destruction and widening of airways) and progressive obstructive airway disease. This chapter provides insight into the specific diagnostic and therapeutic roles of bronchoscopy in patients with bronchiectasis and Cystic Fibrosis.

#### **2. Overview of bronchiectasis**

Bronchiectasis is generally defined as an abnormal and permanent dilatation of the bronchi with thickening of the bronchial wall. In a retrospective cohort study of the insurance claims made in United States, Weycker et al. showed the prevalence of bronchiectasis ranged from 4.2 per 100,000 persons aged 18-34 years to 271.8 per 100,000 among those aged ≥75 years. Prevalence is higher among women than men at all ages (Weycker, D 2005). Bronchiectasis is being recognized with increasing frequency because of the widespread use of highresolution chest computed tomography (HRCT) scanning (Cohen, M 1999). A bronchus is thought to be dilated if on the CT scan the broncho-arterial ratio with the adjacent accompanying artery exceeds 1. There are many causes of bronchiectasis that can be classified as due to anatomic, systemic diseases, congenital, post infectious, or idiopathic

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 109

Fig. 1. CT images of a patient with Yellow Nail Syndrome with pleural effusion. Yellow Nail

Syndrome is characterized by slow growing curved thickened yellow nails with lymphedema, pleural effusion and bronchiectasis on Computed Tomography. Note the

Fig. 2. Tracheobroncheomegaly or Mounier-Kuhn Syndrome. Images show marked

should be greater than 2.4 cm and the left main bronchus greater than 2.3 cm.

dilatation of the trachea and the main stem bronchi. It is characterized by tracheal diameter greater than 3 cm that is measured 2 cm above the aortic arch. The right main bronchus

bronchiectatic airways in the right middle lobe.

(Barker, A.F. 2002, O'Donnell, A.E. 2008). Table 1. Based on the HRCT, bronchiectasis can be classified into 3 types cylindrical bronchiectasis, varicose bronchiectasis and saccular or cystic bronchiectasis. In cylindrical bronchiectasis the bronchi fail to taper as the bronchi progress peripherally. Varicose bronchiectasis has an irregular and beaded appearance and appears as "a string of pearls". Saccular or cystic bronchiectasis appears as a group of cysts without recognizable bronchial structures distal to the sacs (Webb, WR, High resolution CT chest of the Lung 2009).


Table 1. Differential Diagnosis of Known Etiologies of Bronchiectasis

Patients with bronchiectasis typically present with chronic cough recurrent infections and sputum production (Morrissey 2007). Recurrent infections lead to further airway inflammation and damage which worsens the condition. Other presentations include hemoptysis, chronic airflow obstruction, and slow progressive shortness of breath or dyspnea. Physical examination is variable based on the etiology. Bronchography was used in the past for visualization of bronchiectatic airways. This involved coating the airways with a radiopaque dye instilled through a catheter or a bronchoscope. However, with the advent of HRCT this procedure is rarely being utilized. Pulmonary function tests may show airflow obstruction.

(Barker, A.F. 2002, O'Donnell, A.E. 2008). Table 1. Based on the HRCT, bronchiectasis can be classified into 3 types cylindrical bronchiectasis, varicose bronchiectasis and saccular or cystic bronchiectasis. In cylindrical bronchiectasis the bronchi fail to taper as the bronchi progress peripherally. Varicose bronchiectasis has an irregular and beaded appearance and appears as "a string of pearls". Saccular or cystic bronchiectasis appears as a group of cysts without recognizable bronchial structures distal to the sacs (Webb, WR, High resolution CT

> **Inhalational and Obstruction**  Severe Gastroesophageal Reflux

Chronic Aspiration Pneumonia Toxic or Thermal Inhalational Injury

**Alpha1-Antitrypsin Deficiency** 

Tumor (benign and malignant)

**Allergic Bronchopulmonary** 

HIV infection / AIDS Yellow Nail Syndrome Radiation Injury

Or Other Mycosis

Disease

**Cystic Fibrosis** 

**Aspergillosis** 

**Post-obstruction**  Foreign body

**Miscellaneous** 

**Young's Syndrome** 

chest of the Lung 2009).

Lower Respiratory Tract Granulomatous Infections Nectrotizing Pneumonias Other Respiratory infections

**Primary Immune Disorders**  Hypogammaglobulinemia

Neutrophil abnormalities

**Heritable Structural Abnormalities**  Ciliated epithelium such as Primary

Cartilage or Connective Tissue (Tracheobronchiomegaly; Williams-

**Idiopathic Inflammatory Disorders** 

Systemic Lupus Erythematosis

Inflammatory Bowel Disease Relapsing polychondritis

Table 1. Differential Diagnosis of Known Etiologies of Bronchiectasis

Patients with bronchiectasis typically present with chronic cough recurrent infections and sputum production (Morrissey 2007). Recurrent infections lead to further airway inflammation and damage which worsens the condition. Other presentations include hemoptysis, chronic airflow obstruction, and slow progressive shortness of breath or dyspnea. Physical examination is variable based on the etiology. Bronchography was used in the past for visualization of bronchiectatic airways. This involved coating the airways with a radiopaque dye instilled through a catheter or a bronchoscope. However, with the advent of HRCT this procedure is rarely being utilized. Pulmonary function tests may show

Sequestration, agenesis, hypoplasia

Other Humoral / Cellular Disorders

Waldendstrom's

Ciliary Diskinesia

Campbell)

Sarcoidosis

airflow obstruction.

Rheumatoid Arthritis

Sjogren's Syndrome

**Post-Infectious** 

Fig. 1. CT images of a patient with Yellow Nail Syndrome with pleural effusion. Yellow Nail Syndrome is characterized by slow growing curved thickened yellow nails with lymphedema, pleural effusion and bronchiectasis on Computed Tomography. Note the bronchiectatic airways in the right middle lobe.

Fig. 2. Tracheobroncheomegaly or Mounier-Kuhn Syndrome. Images show marked dilatation of the trachea and the main stem bronchi. It is characterized by tracheal diameter greater than 3 cm that is measured 2 cm above the aortic arch. The right main bronchus should be greater than 2.4 cm and the left main bronchus greater than 2.3 cm.

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 111

In addition to the development of bronchiectasis in individuals with Cystic Fibrosis through the pathophysiology of CFTR dysfunction, coincident bacterial and fungal colonization and infection propagate the airway dilation. Patients with Cystic Fibrosis are often colonized with atypical Mycobacterium (Whittaker, L. A 2009). *Mycobacterium avium intracellulare* is the most common such infection which leads to bronchiectasis in middle lobe and lingular segments. Moreover, Allergic Bronchopulmonary Aspergillosis affects up to 10% of CF patients leading to worsening central bronchiectasis (Laufer, P 1984, Knutsen A. P. 2011).

The role of bronchoscopy in Cystic Fibrosis will be discussed herein.

Fig. 5. CT image of right middle lobe involvement of Allergic Bronchopulmonary

there exist certain situations in which bronchoscopy provides vital information.

to aspiration had lipid-laden macrophages on cytology (Li, A.M. 2005)

Bronchoscopy is not routinely indicated for the diagnosis of bronchiectasis. With the increasing resolution and availability of high-resolution computed tomography (HRCT) scanning, the utility of bronchoscopy in patients with bronchiectasis is not clear, although

Bronchoscopy for localized bronchiectasis is indicated to evaluate for the presence of an obstructing lesion causing distally located bronchiectasis when lobar or segmental bronchiectasis is apparant on CT imaging. For example, Middle Lobe Syndrome refers to the chronic collapse of the middle lobe which is often associated with distal middle lobe bronchiectasis. The etiology of Middle Lobe Syndrome has both infectious and non infectious causes. It can be divided into obstructive and non obstructive types (Albo, R.J. 1966, Wagner RB 1983, Einarsson, J.T. 2009, ). Bronchoscopy is indicated in all patients with Middle Lobe Syndrome to evaluate for a compressing or obstructing lesion as malignancy is a common cause. (Albo, R.J. 1966, Wagner R.B. 1982, Priftis, K.N. 2005,). Foriegn body may not be apparant on HRCT. Dikensoy et al in their review of foreign body aspiration reported cases of foreign body seen at bronchoscopy which was not evident on CT of the chest (Dikensoy, O. 2002). Cytological examination of bronchoscopic specimens can provide evidence supporting gastric aspiration as a cause of bronchiectasis in dependent lung segments(Pasteur, M.C. 2010). Li et al showed 3/4 cases of bronchiectasis thought to be due

Aspergillosis with mucus impaction in a patient with Cystic Fibrosis.

**4.1 Role of diagnostic bronchoscopy in bronchiectasis** 

**4. Role of bronchoscopy** 

Fig. 3. Plain radiograph of Kartagener's Syndrome, characterized by situs inversus, azospermia, and bronchiectasis.

Fig. 4. CT cross sections of a patient with Williams-Campbell syndrome which show bilateral cystic bronchiectasis distal to the third-generation bronchi with abnormal distal lucency probably due to air trapping hyperinflation of lung or bronchiolitis

#### **3. Overview of Cystic Fibrosis**

Cystic Fibrosis is the most common life-shortening genetic disease of Caucasians affecting more than 25,000 individuals in the United States. Cystic Fibrosis is an autosomal recessive disease due to alteration in the function of a chloride channel; the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) (Rowe S. M. 2005). In the setting of CFTR dysfunction, an inability of chloride to pass through the channel in the apical membrane of epithelial cells leads to less hydrated secretions from exocrine glands. In the lungs, this causes airway secretions to be thick and difficult to clear. In this milieu, inflammatory cells and colonizing bacteria clogging the airways leads to destruction and dilation with subsequent development of bronchiectasis. The bronchiectasis in patients with Cystic Fibrosis is classically an upper lobe process. However, over time, the destruction becomes widespread involving all lobes.

Fig. 3. Plain radiograph of Kartagener's Syndrome, characterized by situs inversus,

Fig. 4. CT cross sections of a patient with Williams-Campbell syndrome which show bilateral cystic bronchiectasis distal to the third-generation bronchi with abnormal distal

Cystic Fibrosis is the most common life-shortening genetic disease of Caucasians affecting more than 25,000 individuals in the United States. Cystic Fibrosis is an autosomal recessive disease due to alteration in the function of a chloride channel; the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) (Rowe S. M. 2005). In the setting of CFTR dysfunction, an inability of chloride to pass through the channel in the apical membrane of epithelial cells leads to less hydrated secretions from exocrine glands. In the lungs, this causes airway secretions to be thick and difficult to clear. In this milieu, inflammatory cells and colonizing bacteria clogging the airways leads to destruction and dilation with subsequent development of bronchiectasis. The bronchiectasis in patients with Cystic Fibrosis is classically an upper lobe process. However, over time, the destruction becomes

lucency probably due to air trapping hyperinflation of lung or bronchiolitis

azospermia, and bronchiectasis.

**3. Overview of Cystic Fibrosis** 

widespread involving all lobes.

In addition to the development of bronchiectasis in individuals with Cystic Fibrosis through the pathophysiology of CFTR dysfunction, coincident bacterial and fungal colonization and infection propagate the airway dilation. Patients with Cystic Fibrosis are often colonized with atypical Mycobacterium (Whittaker, L. A 2009). *Mycobacterium avium intracellulare* is the most common such infection which leads to bronchiectasis in middle lobe and lingular segments. Moreover, Allergic Bronchopulmonary Aspergillosis affects up to 10% of CF patients leading to worsening central bronchiectasis (Laufer, P 1984, Knutsen A. P. 2011). The role of bronchoscopy in Cystic Fibrosis will be discussed herein.

Fig. 5. CT image of right middle lobe involvement of Allergic Bronchopulmonary Aspergillosis with mucus impaction in a patient with Cystic Fibrosis.

#### **4. Role of bronchoscopy**

#### **4.1 Role of diagnostic bronchoscopy in bronchiectasis**

Bronchoscopy is not routinely indicated for the diagnosis of bronchiectasis. With the increasing resolution and availability of high-resolution computed tomography (HRCT) scanning, the utility of bronchoscopy in patients with bronchiectasis is not clear, although there exist certain situations in which bronchoscopy provides vital information.

Bronchoscopy for localized bronchiectasis is indicated to evaluate for the presence of an obstructing lesion causing distally located bronchiectasis when lobar or segmental bronchiectasis is apparant on CT imaging. For example, Middle Lobe Syndrome refers to the chronic collapse of the middle lobe which is often associated with distal middle lobe bronchiectasis. The etiology of Middle Lobe Syndrome has both infectious and non infectious causes. It can be divided into obstructive and non obstructive types (Albo, R.J. 1966, Wagner RB 1983, Einarsson, J.T. 2009, ). Bronchoscopy is indicated in all patients with Middle Lobe Syndrome to evaluate for a compressing or obstructing lesion as malignancy is a common cause. (Albo, R.J. 1966, Wagner R.B. 1982, Priftis, K.N. 2005,). Foriegn body may not be apparant on HRCT. Dikensoy et al in their review of foreign body aspiration reported cases of foreign body seen at bronchoscopy which was not evident on CT of the chest (Dikensoy, O. 2002). Cytological examination of bronchoscopic specimens can provide evidence supporting gastric aspiration as a cause of bronchiectasis in dependent lung segments(Pasteur, M.C. 2010). Li et al showed 3/4 cases of bronchiectasis thought to be due to aspiration had lipid-laden macrophages on cytology (Li, A.M. 2005)

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 113

pulmonary tuberculosis and found that 22.8 % of patients had smear positive acid fast bacilli, 11.2 % of patients were diagnosed with tuberculosis based on this. In the setting of negative sputum testing in patients with typical clinical and chest radiographic presentations, the diagnostic accuracy was improved to 49.1% with bronchoscopic washings. Twenty-four percent of these demonstrated smear positivity and the other 25% were culture positive (Ismail Y 2004). Watanuki et al. examined 14 subjects with abnormal chest radiographs in which no definite diagnosis could be obtained through sputum analysis including smears and cultures. Bronchoscopic washings were positive for Mycobacterium in 7 patients on smear while cultures were positive in 8 patients. Mycobacterium avium complex (MAC) was identified in 13 patients; however, only 36% of those tested by specific polymerase chain reaction probes were MAC-positive. In patients undergoing transbronchial lung biopsy (n=11), histological review showed granuloma formation in four and caseation in another three patients (Watanuki Y 1999). Watanabe described 19 cases of bronchial stricture or obliteration due to endobronchial tuberculous lesions. Based on their findings, these authors recommended bronchoscopy and computed tomography as methods of choice for accurate diagnosis of tuberculous bronchial involvement (Watanabe Y 1997). Moreover, these modalities may aid in the assessment for surgery. Based on review of the available literature focusing on Tuberculosis or other Mycobacterial infections in the setting of bronchiectasis, bronchoscopy should be considered when diagnosis is uncertain in high-risk patients or when assessment of intervention is

Most of the current literature about the use of bronchoscopy in Cystic Fibrosis comes from pediatric experience. In infants with asymptomatic CF and those diagnosed through newborn screening, bronchoscopy is useful in defining bacterial colonization and inflammation in the airways not obtainable through less invasive means (Rosenfeld, M. 2001). The high yield of microbiology, cytology, and pH probe investigations in newborn infants with CF suggests that invasive surveillance fiber optic bronchoscopy (FOB) should be considered (Stafler, P. 2001). Bronchoscopy has been used for studying inflammatory markers such as Interleukin -8 and nitrite in the lower airway of patients with Cystic Fibrosis (Noah, T.L. 2003, Cetin, I. 2004, Davis, S.D. 2007, Cobanoglu, N. 2010). Bronchoscopy has similarly been used for identification of atypical airway infections. Semi quantitative culture of bronchoalveolar lavage (BAL) fluid was a useful diagnostic tool in CF patients in whom empiric therapy failed (Baughman, R.P. 1997). Dahm et al. showed fiberoptic bronchoscopy to be a superior technique for obtaining BAL samples as compared to rigid bronchoscopy or bronchial washout (Dahm, L.S. 1977). Davis et al. showed that the BAL fluid inflammation as indicated by the percent of recovered neutrophils and Interleukin -8 levels was significantly higher in the area identified as having the greatest disease on a high resolution chest CT (Davis, S.D. 2007). This highlights the potential importance of performing BAL in more than one area in patients with CF. In a retrospective study, Gilchrist et al showed that single-lobe bronchoalveolar lavage is not sufficient in assessing patients with cystic fibrosis for lower airway infection (Gilchrist, F.J. 2011). Studies have also compared sputum versus BAL in CF (Aaron, S.D. 2004). Bronchoscopy has been used to localize the site of bleeding in patients with CF-related hemoptysis, although there is

necessary.

**4.2 Role of bronchoscopy in Cystic Fibrosis** 

little evidence for its benefit (Flume, P.A. 2010).

The British Thoracic Society published guidelines related to the utility of bronchoscopy in non-Cystic Fibrosis Bronchiectasis in 2010, which lists several indications for diagnostic bronchoscopy (Pasteur, M.C. 2010). Table 2.

Pasteur et al identified a study by Fernald at el in 1978 in stable state in which bronchoscopy did not show any advantage over sputum culture at identifying lower respiratory tract pathogens (Pasteur, M.C. 2010 Fernald G.W., 1978). Shiekh et al retrospectively evaluated the occurence of bronchiectasis in children with HIV pneumopathy (Shiekh, S. 1997 ). They found that bronchoalveolar lavage (BAL) had a high yield of clinically relevant information that required specific treatment. 22/57 (38.6%) were positive of Pneumocystis carinii, 14/27 (24.5%) had CMV and 12/27 (21%) were positive for MAI.


Table 2. British Thoracic Society Guidelines on non-Cystic Fibrosis Bronchiectasis

Pang et al while evaluating the bacteriology of bronchiectasis in Hong Kong, concluded that BAL and protected specimen brush are comparably sensitive in detecting lower respiratory tract organisms (Pang, J.A. 1989). Cabello et al looked at distal airway flora of healthy subjects with chronic lung disease including those with bronchiectasis and found that 88% of patients had bacterial colonization (Cabello, H. 1997). They also found comparable sensitivities between both BAL and protected specimen brush. Tanaka et al found that bronchial washings was twice as sensitive as expectorated sputum for isolation of Mycobacterium avium complex (Tanaka, E. 1997). They also went on to show that granuloma formation as seen on lung biopsy would suggest infection rather than colonization.

Bronchoscopy in the setting of Tuberculosis is a vast topic and is beyond the scope of this chapter, however, a brief review is warranted. In endemic areas, a positive sputum acid-fast bacilli (AFB) smear is frequently regarded as diagnostic of pulmonary tuberculosis. Negative AFB smears often poses a diagnostic challenge. Tan et al examined the clinical utility of rapid Mycobacterium tuberculosis (MTB) detection in bronchoalveolar lavage (BAL) samples by polymerase chain reaction (PCR). BAL PCR had sensitivity, specificity, positive and negative predictive values of 66.7%, 100%, 100% and 88%, respectively, for the group with upper lobe infiltrates (Tan YK 1999). Ismail and coworkers reviewed 232 cases of

The British Thoracic Society published guidelines related to the utility of bronchoscopy in non-Cystic Fibrosis Bronchiectasis in 2010, which lists several indications for diagnostic

Pasteur et al identified a study by Fernald at el in 1978 in stable state in which bronchoscopy did not show any advantage over sputum culture at identifying lower respiratory tract pathogens (Pasteur, M.C. 2010 Fernald G.W., 1978). Shiekh et al retrospectively evaluated the occurence of bronchiectasis in children with HIV pneumopathy (Shiekh, S. 1997 ). They found that bronchoalveolar lavage (BAL) had a high yield of clinically relevant information that required specific treatment. 22/57 (38.6%) were positive of Pneumocystis carinii, 14/27

1. Bronchiectasis in a single lobe to exclude a foreign body obstruction especially in

2. In adults with localized disease, bronchoscopy may be indicated to exclude

3. Bronchoscopy is useful for obtaining microbiological results in patients who are

4. Bronchoscopic sampling of lower respiratory tract secretions may be indicated in patients with bronchiectasis in whom serial sputum testing is not yielding results

5. Bronchoscopy can be used to obtain endobronchial biopsy of airway cilia to

6. Bronchoscopy can be used to localize the site of bleeding in patients with bronchiectasis and hemoptysis which can guide further interventional therapies.

Table 2. British Thoracic Society Guidelines on non-Cystic Fibrosis Bronchiectasis

Pang et al while evaluating the bacteriology of bronchiectasis in Hong Kong, concluded that BAL and protected specimen brush are comparably sensitive in detecting lower respiratory tract organisms (Pang, J.A. 1989). Cabello et al looked at distal airway flora of healthy subjects with chronic lung disease including those with bronchiectasis and found that 88% of patients had bacterial colonization (Cabello, H. 1997). They also found comparable sensitivities between both BAL and protected specimen brush. Tanaka et al found that bronchial washings was twice as sensitive as expectorated sputum for isolation of Mycobacterium avium complex (Tanaka, E. 1997). They also went on to show that granuloma formation as seen on lung biopsy would suggest infection rather than

Bronchoscopy in the setting of Tuberculosis is a vast topic and is beyond the scope of this chapter, however, a brief review is warranted. In endemic areas, a positive sputum acid-fast bacilli (AFB) smear is frequently regarded as diagnostic of pulmonary tuberculosis. Negative AFB smears often poses a diagnostic challenge. Tan et al examined the clinical utility of rapid Mycobacterium tuberculosis (MTB) detection in bronchoalveolar lavage (BAL) samples by polymerase chain reaction (PCR). BAL PCR had sensitivity, specificity, positive and negative predictive values of 66.7%, 100%, 100% and 88%, respectively, for the group with upper lobe infiltrates (Tan YK 1999). Ismail and coworkers reviewed 232 cases of

bronchoscopy (Pasteur, M.C. 2010). Table 2.

children;

acutely ill;

proximal obstruction;

and who are worsening;

investigate causes of bronchiectasis

colonization.

(24.5%) had CMV and 12/27 (21%) were positive for MAI.

pulmonary tuberculosis and found that 22.8 % of patients had smear positive acid fast bacilli, 11.2 % of patients were diagnosed with tuberculosis based on this. In the setting of negative sputum testing in patients with typical clinical and chest radiographic presentations, the diagnostic accuracy was improved to 49.1% with bronchoscopic washings. Twenty-four percent of these demonstrated smear positivity and the other 25% were culture positive (Ismail Y 2004). Watanuki et al. examined 14 subjects with abnormal chest radiographs in which no definite diagnosis could be obtained through sputum analysis including smears and cultures. Bronchoscopic washings were positive for Mycobacterium in 7 patients on smear while cultures were positive in 8 patients. Mycobacterium avium complex (MAC) was identified in 13 patients; however, only 36% of those tested by specific polymerase chain reaction probes were MAC-positive. In patients undergoing transbronchial lung biopsy (n=11), histological review showed granuloma formation in four and caseation in another three patients (Watanuki Y 1999). Watanabe described 19 cases of bronchial stricture or obliteration due to endobronchial tuberculous lesions. Based on their findings, these authors recommended bronchoscopy and computed tomography as methods of choice for accurate diagnosis of tuberculous bronchial involvement (Watanabe Y 1997). Moreover, these modalities may aid in the assessment for surgery. Based on review of the available literature focusing on Tuberculosis or other Mycobacterial infections in the setting of bronchiectasis, bronchoscopy should be considered when diagnosis is uncertain in high-risk patients or when assessment of intervention is necessary.

#### **4.2 Role of bronchoscopy in Cystic Fibrosis**

Most of the current literature about the use of bronchoscopy in Cystic Fibrosis comes from pediatric experience. In infants with asymptomatic CF and those diagnosed through newborn screening, bronchoscopy is useful in defining bacterial colonization and inflammation in the airways not obtainable through less invasive means (Rosenfeld, M. 2001). The high yield of microbiology, cytology, and pH probe investigations in newborn infants with CF suggests that invasive surveillance fiber optic bronchoscopy (FOB) should be considered (Stafler, P. 2001). Bronchoscopy has been used for studying inflammatory markers such as Interleukin -8 and nitrite in the lower airway of patients with Cystic Fibrosis (Noah, T.L. 2003, Cetin, I. 2004, Davis, S.D. 2007, Cobanoglu, N. 2010). Bronchoscopy has similarly been used for identification of atypical airway infections. Semi quantitative culture of bronchoalveolar lavage (BAL) fluid was a useful diagnostic tool in CF patients in whom empiric therapy failed (Baughman, R.P. 1997). Dahm et al. showed fiberoptic bronchoscopy to be a superior technique for obtaining BAL samples as compared to rigid bronchoscopy or bronchial washout (Dahm, L.S. 1977). Davis et al. showed that the BAL fluid inflammation as indicated by the percent of recovered neutrophils and Interleukin -8 levels was significantly higher in the area identified as having the greatest disease on a high resolution chest CT (Davis, S.D. 2007). This highlights the potential importance of performing BAL in more than one area in patients with CF. In a retrospective study, Gilchrist et al showed that single-lobe bronchoalveolar lavage is not sufficient in assessing patients with cystic fibrosis for lower airway infection (Gilchrist, F.J. 2011). Studies have also compared sputum versus BAL in CF (Aaron, S.D. 2004). Bronchoscopy has been used to localize the site of bleeding in patients with CF-related hemoptysis, although there is little evidence for its benefit (Flume, P.A. 2010).

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 115

the sinus (Muhlebach, M.S. 2006). In the Australasian Cystic Fibrosis Bronchoalveolar Lavage randomized controlled trial cystic fibrosis patients identified through newborn screening were randomly assigned to BAL directed therapy versus standard therapy (Wainwright, C.E. 2011). They reported similar prevalence of Pseudomonas and other organisms amongst the two groups. There were no significant differences in the secondary outcomes such as FEV1, weight or BMI amongst the two groups. BAL fluid in cystic fibrosis patients has also been used to quantify and assess BAL fluid nitrite levels as this may reflect adequate the degree of inflammation in the respiratory tract and could potentially be a

Cobanoglu et al studied the levels of ANCA in serum and BAL fluid to identify any relationship with infection (Cobanoglu, N 2010). MacGregor et al analyzed the BAL fluid obtained from CF patients using mass-spectrometry techniques (MacGregor, G 2008).

Bronchoscopy with protected Brush has been used to collect uncontaminated airway specimen for culture from the lower airways. As the brush is used to directly obtain secretions and bacteria from the airway lumen and then retracted into a sterile sheath, it is thought to have minimal contamination from other airway secretions. Aaron et al (2004) tried to see if bronchoscopy with protected brush would sample biofilm-forming bacteria on the airway wall as opposed to traditional sputum collection techniques. A total of 12 patients were evaluated with protected brush bronchoalveolar lavage and expectorated sputum collection. They showed that 10 patients (83%) had the same strain of *Pseudomonas aeruginosa* found using all 3 techniques. They concluded that sputum collection provided as much information for characterization and antibiotic susceptibility testing of *Pseudomonas aeruginosa* infection as bronchoscopy with protected brush (Aaron, S.D. 2004). As mentioned in previous sections Pang et al as well as Cabello et al showed that protected brush specimen was comparably sensitive to bronchoalveolar lavage in detecting lower respiratory tract organisms in patients

**4.2.3 Role of endobronchial and transbronchial biopsy in bronchiectasis and CF** 

Endobronchial biopsy during bronchoscopy is a minimally used technique in the diagnostic evaluation of patient's with cystic fibrosis. There is a theoretical concern of bleeding with endobronchial biopsy in these patients due to increased blood flow. Endobronchial biopsy has been used safely in adults with cystic fibrosis during research protocols. Molina-Teran et al retrospectively looked at 45 bronchoscopies with endobronchial biopsies in children with cystic fibrosis at their Institute and matched them to control. They noted 6/45 (13%) had complications during the procedure of which 4 had significant coughing, 1 had > 10 % drop in oxygen saturation which improved with oxygen and 1 had dental loss. During the 12 hours after the procedure there was no significant complications in both patients with cystic fibrosis and the controls. They did not note any significant bleeding (Molina-Teran, A. 2006). One of the drawback of this study is that they is did not quantify the bleeding. Patients with severe CF were excluded from the study. In 2007 Regamey et al prospectively assessed the quality of the biopsy specimen obtained from children with cystic fibrosis using non-CF patients as control. They concluded that adequate biopsy specimens could be obtained to study the airway of patients with cystic fibrosis (Regamey, N. 2007). They did suggest taking at least 2 biopsies and

useful indicator of airway inflammation for patients with CF (Cetin, I 2004).

**4.2.2 Role of protected brushing in bronchiectasis and CF** 

with bronchiectasis (Pang, J.A. 1989, Cabello, H. 1997).

#### **4.2.1 Role of Bronchoalveolar Lavage (BAL) in bronchiectasis and CF**

There is evidence of early functional structural and pathological changes including bronchiectasis in babies with CF (Linnane, B.M. 2008, Linnane, B.M., Hall G.L.2008). Hillard et al in UK showed that 44% of asymptomatic children investigated with Bronchoscopy and BAL had a positive culture prior to newborn screening (Hillard, T.N. 2007). While looking at the patient's after newborn screening they found 27% of asymptomatic patient's had positive BAL cultures. There was evidence of airway inflammation as well. Whether early identification and aggressive treatment of asymptomatic pulmonary infections delays the decline in lung function is a matter of debate and at the present time there are no longitudinal studies. In a retrospective review of bronchoscopies performed in pediatric cystic fibrosis patient's Boogarard et al showed that 28/66 (42%) of the BAL provided information that had therapeutic consequences (Boogaard, R. 2008). The European Respiratory Society guidelines in 2000 recommended taking one BAL specimen from the most effected lobe or the right middle lobe (de Blic J 2000). This was later changed to two BALs specimens in 2007 (Brennan, S. 2008). In a retrospective review Gilchrist et al found that if they have used the 2000 ERS guidelines of only sampling a lobe they could have missed 26 positive cultures, while if they used the most current or 2007 guidelines for BAL sampling with 2 BALS at 2 different lobes then they would have missed only 12 positive cultures out of 39 (Gilchrist, F.J. 2011).

Fig. 6. CT image of a 24-year-old female with Cystic Fibrosis. The patient had frequent pulmonary exacerbations of Cystic Fibrosis and progressive decline in lung function in spite of aggressive appropriate antibiotic therapy guided by expectorated sputum cultures. She subsequently underwent a directed bronchoscopy with BAL in the right middle lobe (arrow) which grew *Mycobacterium abscessus*. Treatment of this infection broke the cycle of recurrent pulmonary exacerbations.

BAL has also been compared to oropharyngeal swabs to determine the pathogen causing sinus infection by Muhlebach et al. Sinusitis can cause CF exacerbations. The diagnostic accuracy of BAL and oropharyngeal swabs cultures was low in predicting sinus infections especially at younger ages. The positive predictive value of BAL sample for *Pseudomonas aeruginosa* infection was 65% while the negative predictive value was 67%. These were similar to oropharyngeal swab cultures. The positive predictive value for *Staphylococcus aureus* was 76% and a negative predictive value was 63% for the BAL fluid. Based on this study both BAL and oropharyngeal swabs are poor predictors of the organisms present in

There is evidence of early functional structural and pathological changes including bronchiectasis in babies with CF (Linnane, B.M. 2008, Linnane, B.M., Hall G.L.2008). Hillard et al in UK showed that 44% of asymptomatic children investigated with Bronchoscopy and BAL had a positive culture prior to newborn screening (Hillard, T.N. 2007). While looking at the patient's after newborn screening they found 27% of asymptomatic patient's had positive BAL cultures. There was evidence of airway inflammation as well. Whether early identification and aggressive treatment of asymptomatic pulmonary infections delays the decline in lung function is a matter of debate and at the present time there are no longitudinal studies. In a retrospective review of bronchoscopies performed in pediatric cystic fibrosis patient's Boogarard et al showed that 28/66 (42%) of the BAL provided information that had therapeutic consequences (Boogaard, R. 2008). The European Respiratory Society guidelines in 2000 recommended taking one BAL specimen from the most effected lobe or the right middle lobe (de Blic J 2000). This was later changed to two BALs specimens in 2007 (Brennan, S. 2008). In a retrospective review Gilchrist et al found that if they have used the 2000 ERS guidelines of only sampling a lobe they could have missed 26 positive cultures, while if they used the most current or 2007 guidelines for BAL sampling with 2 BALS at 2 different lobes then they would have missed only 12 positive

Fig. 6. CT image of a 24-year-old female with Cystic Fibrosis. The patient had frequent pulmonary exacerbations of Cystic Fibrosis and progressive decline in lung function in spite of aggressive appropriate antibiotic therapy guided by expectorated sputum cultures. She subsequently underwent a directed bronchoscopy with BAL in the right middle lobe (arrow) which grew *Mycobacterium abscessus*. Treatment of this infection broke the cycle of recurrent

BAL has also been compared to oropharyngeal swabs to determine the pathogen causing sinus infection by Muhlebach et al. Sinusitis can cause CF exacerbations. The diagnostic accuracy of BAL and oropharyngeal swabs cultures was low in predicting sinus infections especially at younger ages. The positive predictive value of BAL sample for *Pseudomonas aeruginosa* infection was 65% while the negative predictive value was 67%. These were similar to oropharyngeal swab cultures. The positive predictive value for *Staphylococcus aureus* was 76% and a negative predictive value was 63% for the BAL fluid. Based on this study both BAL and oropharyngeal swabs are poor predictors of the organisms present in

**4.2.1 Role of Bronchoalveolar Lavage (BAL) in bronchiectasis and CF** 

cultures out of 39 (Gilchrist, F.J. 2011).

pulmonary exacerbations.

the sinus (Muhlebach, M.S. 2006). In the Australasian Cystic Fibrosis Bronchoalveolar Lavage randomized controlled trial cystic fibrosis patients identified through newborn screening were randomly assigned to BAL directed therapy versus standard therapy (Wainwright, C.E. 2011). They reported similar prevalence of Pseudomonas and other organisms amongst the two groups. There were no significant differences in the secondary outcomes such as FEV1, weight or BMI amongst the two groups. BAL fluid in cystic fibrosis patients has also been used to quantify and assess BAL fluid nitrite levels as this may reflect adequate the degree of inflammation in the respiratory tract and could potentially be a useful indicator of airway inflammation for patients with CF (Cetin, I 2004).

Cobanoglu et al studied the levels of ANCA in serum and BAL fluid to identify any relationship with infection (Cobanoglu, N 2010). MacGregor et al analyzed the BAL fluid obtained from CF patients using mass-spectrometry techniques (MacGregor, G 2008).

#### **4.2.2 Role of protected brushing in bronchiectasis and CF**

Bronchoscopy with protected Brush has been used to collect uncontaminated airway specimen for culture from the lower airways. As the brush is used to directly obtain secretions and bacteria from the airway lumen and then retracted into a sterile sheath, it is thought to have minimal contamination from other airway secretions. Aaron et al (2004) tried to see if bronchoscopy with protected brush would sample biofilm-forming bacteria on the airway wall as opposed to traditional sputum collection techniques. A total of 12 patients were evaluated with protected brush bronchoalveolar lavage and expectorated sputum collection. They showed that 10 patients (83%) had the same strain of *Pseudomonas aeruginosa* found using all 3 techniques. They concluded that sputum collection provided as much information for characterization and antibiotic susceptibility testing of *Pseudomonas aeruginosa* infection as bronchoscopy with protected brush (Aaron, S.D. 2004). As mentioned in previous sections Pang et al as well as Cabello et al showed that protected brush specimen was comparably sensitive to bronchoalveolar lavage in detecting lower respiratory tract organisms in patients with bronchiectasis (Pang, J.A. 1989, Cabello, H. 1997).

#### **4.2.3 Role of endobronchial and transbronchial biopsy in bronchiectasis and CF**

Endobronchial biopsy during bronchoscopy is a minimally used technique in the diagnostic evaluation of patient's with cystic fibrosis. There is a theoretical concern of bleeding with endobronchial biopsy in these patients due to increased blood flow. Endobronchial biopsy has been used safely in adults with cystic fibrosis during research protocols. Molina-Teran et al retrospectively looked at 45 bronchoscopies with endobronchial biopsies in children with cystic fibrosis at their Institute and matched them to control. They noted 6/45 (13%) had complications during the procedure of which 4 had significant coughing, 1 had > 10 % drop in oxygen saturation which improved with oxygen and 1 had dental loss. During the 12 hours after the procedure there was no significant complications in both patients with cystic fibrosis and the controls. They did not note any significant bleeding (Molina-Teran, A. 2006). One of the drawback of this study is that they is did not quantify the bleeding. Patients with severe CF were excluded from the study. In 2007 Regamey et al prospectively assessed the quality of the biopsy specimen obtained from children with cystic fibrosis using non-CF patients as control. They concluded that adequate biopsy specimens could be obtained to study the airway of patients with cystic fibrosis (Regamey, N. 2007). They did suggest taking at least 2 biopsies and

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 117

Bronchomalacia or collapse of the large airway is only rarely reported as a complication of CF. Herlitz et al. were the first to report the successful deployment of an expandable silicone stent to treat bronchomalcia in a 15 year old with CF (Herlitz, G.N. 2006). This led to clinical improvement as well as improvement in the pulmonary function test obviating the immediate need for lung transplant. Bronchoscopy and transbronchial stenting have been used to treat complications arising from lung transplantation or surgery in patients with cystic fibrosis. Wood at al reported a case of a 20-year-old with cystic fibrosis who came with recurrent massive hemoptysis that was due to bronchopleural fistula at the stump site. They used superglue (butyl or Methy methacrylate) passed through a Teflon catheter through the working channel of the bronchoscope to seal the stump (Wood, R.E. 1992). Bronchoscopy has been used in management of hemoptysis in patients with CF and bronchiectasis. Joseph at al used bronchoscopic techniques for gene transfer to airway epithelium using adenoviruses for cystic fibrosis (Joseph, P.M. 2001, Perricone, M.A. 2001).

Adverse events are common with BAL in young CF children, but are usually transient and well tolerated (Wainwright, C.E. 2008). Wainwright at al conducted a prospective multicenter study to systematically evaluate safety and adverse events associated with BAL in pediatric CF patients. They looked at pediatric patients undergoing BAL between September 1999 and December 2005. Twenty-nine of 333 (8.7%) of the BALs were followed by fever; 10 (3%) had clinically significant deterioration of which five required assisted ventilation during the procedure due to desaturation; one had a ventricular tachyarrhythmia after the use of an anesthetic agent; and one was hospitalized for stridor and respiratory distress. The rates of patients with fever in this study were no different than the rates reported in other studies in children without CF. Transient fever after BAL is thought to be associated with elevated serum pro inflammatory markers and can develop without bacteremia. They did find that focal bronchitis was associated with clinically significant deterioration during or after the BAL procedure, the reason for which were not entirely clear. Another strong association noted was between *Streptococcus pneumonia* in BAL fluid and fever afterwards. Worsening of cough was the most frequently reported minor event. It did not result in any increase in hospitalization. As mentioned previously, in a retrospective review Molina-Teran et al. showed that endobronchial biopsy performed under general anesthesia can be done safely in children with CF (Molina-Teran, A. 2006). They noted 6/45 (13%) had complications during the procedure of which 4 had significant coughing, 1 had > 10 % drop in oxygen saturation which improved with oxygen and 1 had dental loss. During the 12 hours after the procedure there was no significant complications in both patients with cystic fibrosis and the controls. They did not note any significant bleeding. The major drawback of this study was that it did not quantify the bleeding or include patients with severe disease. Endobronchial biopsy has been performed safely in adult CF patients for the purpose of

As with all procedures, the safety of the patient is paramount. Decisions regarding the best approach for patient control and comfort surround multiple patient factors as well as consideration for the duration and technical aspects of the procedure. Conscious sedation is

**5. Safety of bronchoscopy in Cystic Fibrosis** 

research.

**6. Role of anaesthesia and sedation** 

the use of large forceps during the biopsy procedure. As mentioned earlier, in patients with bronchiectasis with suggestion of MAC on HRCT Tanaka et al found that 10/26 who underwent transbronchial lung biopsy had granuloma formation, 8 of whom were positive for MAC and 2 were positive for M. *abscessus* and M. *fortuitum*. They showed that this was present with infection and not with colonization (Tanaka, E. 1997).

We can conclude that in the bronchial biopsy can be used safely as a diagnostic tool in the evaluation and management of patient's with Cystic Fibrosis and bronchiectasis. In the setting of uncertainty in CF, it can yield important information leading to therapeutic guidance.

#### **4.3 Role of bronchoscopy for therapeutics**

Despite the paucity of literature in bronchoscopy for patients with cystic fibrosis and bronchiectasis there are reports of its therapeutic use. Lobar atelectasis is a common complication in patients with cystic fibrosis. Morbidity and mortality of patient's with cystic fibrosis has been linked to their FEV1. As such the consequences of persistent atelectasis in these patients can be serious (Stern, R.C. 1978). Whitaker et al reported a case series of CF patients with Allergic Bronchopulmonary Aspergillosis (ABPA) who successfully underwent sequential bronchoscopy with installation of recombinant human DNase to achieve re-expansion of the lung after they had failed standard medical therapy (Whitaker, P. 2011). McLaughlin et al. successfully treated lobar atelectasis in CF patients with ABPA, which was resistant to conventional therapy with antibiotics and chest physiotherapy, with bronchoscopic instillation of recombinant human deoxyribonuclease (rhDNase) (McLaughlin, A.M. 2008). Slattery et al also showed similar results in another retrospective study. They showed therapeutic bronchoscopy with rhDNase lavage was shown to be safe and associated with improved chest radiographs in pediatric CF patients with persistent atelectasis (Slattery, D.M. 2001).

Fig. 7. CT image of a 42-year-old woman with Cystic Fibrosis with recurrent massive hemoptysis. Initially based on imaging, a left-sided source was assumed and she underwent bronchial artery embolization (BAE). As hemoptysis was unremitting, bronchoscopy was performed to localize the source, which was identified and successfully treated with BAE of the right upper lobe vessels.

the use of large forceps during the biopsy procedure. As mentioned earlier, in patients with bronchiectasis with suggestion of MAC on HRCT Tanaka et al found that 10/26 who underwent transbronchial lung biopsy had granuloma formation, 8 of whom were positive for MAC and 2 were positive for M. *abscessus* and M. *fortuitum*. They showed that this was present

We can conclude that in the bronchial biopsy can be used safely as a diagnostic tool in the evaluation and management of patient's with Cystic Fibrosis and bronchiectasis. In the setting of uncertainty in CF, it can yield important information leading to therapeutic guidance.

Despite the paucity of literature in bronchoscopy for patients with cystic fibrosis and bronchiectasis there are reports of its therapeutic use. Lobar atelectasis is a common complication in patients with cystic fibrosis. Morbidity and mortality of patient's with cystic fibrosis has been linked to their FEV1. As such the consequences of persistent atelectasis in these patients can be serious (Stern, R.C. 1978). Whitaker et al reported a case series of CF patients with Allergic Bronchopulmonary Aspergillosis (ABPA) who successfully underwent sequential bronchoscopy with installation of recombinant human DNase to achieve re-expansion of the lung after they had failed standard medical therapy (Whitaker, P. 2011). McLaughlin et al. successfully treated lobar atelectasis in CF patients with ABPA, which was resistant to conventional therapy with antibiotics and chest physiotherapy, with bronchoscopic instillation of recombinant human deoxyribonuclease (rhDNase) (McLaughlin, A.M. 2008). Slattery et al also showed similar results in another retrospective study. They showed therapeutic bronchoscopy with rhDNase lavage was shown to be safe and associated with improved chest radiographs in pediatric CF patients with persistent

Fig. 7. CT image of a 42-year-old woman with Cystic Fibrosis with recurrent massive hemoptysis. Initially based on imaging, a left-sided source was assumed and she underwent bronchial artery embolization (BAE). As hemoptysis was unremitting, bronchoscopy was performed to localize the source, which was identified and successfully treated with BAE of

with infection and not with colonization (Tanaka, E. 1997).

**4.3 Role of bronchoscopy for therapeutics** 

atelectasis (Slattery, D.M. 2001).

the right upper lobe vessels.

Bronchomalacia or collapse of the large airway is only rarely reported as a complication of CF. Herlitz et al. were the first to report the successful deployment of an expandable silicone stent to treat bronchomalcia in a 15 year old with CF (Herlitz, G.N. 2006). This led to clinical improvement as well as improvement in the pulmonary function test obviating the immediate need for lung transplant. Bronchoscopy and transbronchial stenting have been used to treat complications arising from lung transplantation or surgery in patients with cystic fibrosis. Wood at al reported a case of a 20-year-old with cystic fibrosis who came with recurrent massive hemoptysis that was due to bronchopleural fistula at the stump site. They used superglue (butyl or Methy methacrylate) passed through a Teflon catheter through the working channel of the bronchoscope to seal the stump (Wood, R.E. 1992). Bronchoscopy has been used in management of hemoptysis in patients with CF and bronchiectasis. Joseph at al used bronchoscopic techniques for gene transfer to airway epithelium using adenoviruses for cystic fibrosis (Joseph, P.M. 2001, Perricone, M.A. 2001).

#### **5. Safety of bronchoscopy in Cystic Fibrosis**

Adverse events are common with BAL in young CF children, but are usually transient and well tolerated (Wainwright, C.E. 2008). Wainwright at al conducted a prospective multicenter study to systematically evaluate safety and adverse events associated with BAL in pediatric CF patients. They looked at pediatric patients undergoing BAL between September 1999 and December 2005. Twenty-nine of 333 (8.7%) of the BALs were followed by fever; 10 (3%) had clinically significant deterioration of which five required assisted ventilation during the procedure due to desaturation; one had a ventricular tachyarrhythmia after the use of an anesthetic agent; and one was hospitalized for stridor and respiratory distress. The rates of patients with fever in this study were no different than the rates reported in other studies in children without CF. Transient fever after BAL is thought to be associated with elevated serum pro inflammatory markers and can develop without bacteremia. They did find that focal bronchitis was associated with clinically significant deterioration during or after the BAL procedure, the reason for which were not entirely clear. Another strong association noted was between *Streptococcus pneumonia* in BAL fluid and fever afterwards. Worsening of cough was the most frequently reported minor event. It did not result in any increase in hospitalization. As mentioned previously, in a retrospective review Molina-Teran et al. showed that endobronchial biopsy performed under general anesthesia can be done safely in children with CF (Molina-Teran, A. 2006). They noted 6/45 (13%) had complications during the procedure of which 4 had significant coughing, 1 had > 10 % drop in oxygen saturation which improved with oxygen and 1 had dental loss. During the 12 hours after the procedure there was no significant complications in both patients with cystic fibrosis and the controls. They did not note any significant bleeding. The major drawback of this study was that it did not quantify the bleeding or include patients with severe disease. Endobronchial biopsy has been performed safely in adult CF patients for the purpose of research.

#### **6. Role of anaesthesia and sedation**

As with all procedures, the safety of the patient is paramount. Decisions regarding the best approach for patient control and comfort surround multiple patient factors as well as consideration for the duration and technical aspects of the procedure. Conscious sedation is

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 119

Propofol makes it an ideal choice. Ketamine is relatively contraindicated due to increased bronchial secretions. The advantage of volatile inhalational agents used in general anesthesia is that they cause bronchodilation, decrease muscle relaxant dosage, and reduced airway hyperreactivity. Although Desflurane has an undesired pungent odor and respiratory tract irritability which makes it a poor choice of agent. Systemic hydration and humidification of inspired gasses are important for maintaining secretions in a less viscous state. If muscle relaxants are used short-acting nondepolarizing agents may be more appropriate. They should be administered in minimum possible doses. It should be noted that the aminoglycoside antibiotics use to treat infections might prolong the neuromuscular blocking affect. Extubation

Anesthesia should be tailored towards rapid postoperative recovery of the ability to cough and take deep breaths to actively clear secretions. Post procedure aggressive suctioning, chest physiotherapy and oxygen supplementation should be continued till the effect of the

**Further testing** 

Coagulation tests Arterial blood gas Echocardiogram

anesthetic agent has worn off and patient is back to his/her previous state of health.

**7. Approach to performing bronchoscopy in bronchiectasis and CF** 

in determining which patients may benefit from peri-operative antibiotics.

Preparation for bronchoscopy in patients with cystic fibrosis or chronic suppurative bronchiectasis is similar to the initial evaluation for anaesthesia. Important aspects include a clear understanding of the indication for bronchoscopy. As the pulmonologist understanding the current and usual steady state of the patients' respiratory function is critical. While there are no clear guidelines to support peri-operative antibiotics these patients may have a higher likelihood of transient bacteraemia or post bronchoscopic febrile episodes. Judicious clinical judgement of the patients overall condition should be followed

Having a clear understanding of the indications for the procedure in these patients is not only important in weighing risk and benefit but in allowing an expeditious procedure. Patients with advanced obstructive lung disease may have difficulty with hypoxemia and other complications. A well planned procedure will shorten the duration and attempt to

If the indication is for airway sampling for culture, care must be taken to avoid contamination of the cultures by suctioning in the upper airway. This may be difficult due

should be delayed until the effect of muscle relaxants has worn off.

**Suggested tests** 

Chest X ray

mitigate risk.

Serum electrolytes Complete blood count Liver function tests

Pulmonary function tests Blood glucose levels Electrocardiogram

Table 3. Preoperative test for Anesthesia

Adapted from Karlet, 2002

performed by many providers performing bronchoscopies on patients with bronchiectasis and cystic fibrosis. However, due to profound bronchoscopasm often experienced with airway manipulation, consideration for the utilization of anesthesia support should strongly be considered in patients with bronchiectasis and cystic fibrosis.

Little was known initially about the role of general anesthesia in patients with Cystic Fibrosis. Price showed that a marked deterioration in lung function took place after a brief anesthetic for a relatively minor surgical procedure (Price, J.F. 1986). In a retrospective review, Chhajed et al showed that the sedative drug requirements during bronchoscopy were higher in patients with CF, especially after lung transplantation (Chhajed, P.N. 2005). Few authors reviewed the preoperative assessment, intraoperative and postoperative management of patients with CF (Huffmyer, J.L. 2009, Della Rocca, G. 2002, Walsh, T.S. 1995). An anesthetic plan for patients with CF undergoing procedures was described by Karlet et al (Karlet, M.C. 2000).

The respiratory dysfunction associated with cystic fibrosis should be the major focus of preoperative evaluation by the anesthesiologist. The anesthesiologist should quantify the level of pulmonary function and extent of cardiopulmonary limitation preoperatively and attempts must be made to optimize it prior to the procedure. Historically, the amounts of sputum production, decreased exercise tolerance, decreasing weight are important features. If patients report an increased cough, wheezing, increased sputum production, decreased activity level, infection or other symptoms to suggest CF exacerbation, admission to the hospital for optimization of lung function should be considered. Hypercarbia typically develops late in cystic fibrosis.

All cases should receive chest radiograph, pulmonary function testing, serum electrolyte levels including blood glucose levels, complete blood cell count and liver function tests (Della Rocca, G. 2002). Depending on the type of bronchoscopy being performed and the patient's history of liver involvement, further coagulation testing may be ordered. Moreover, arterial blood gas measurements, electrocardiogram, and echocardiogram may also be performed prior to the procedure if warranted by the patient's history.

Patient's routine medications including bronchodilators and corticosteroids should be continued into the perioperative period. Sedatives and analgesics should be used cautiously in the preoperative period as they can depress the respiratory drive and patient's inability to clear secretions (Huffmyer, J.L. 2009). Premedication with an antacid such as H2 blocker should be considered as there is a higher incidence of gastroesophageal reflux (Weeks, A.M. 1995).

Procedural monitoring should include continuous electrocardiography, respiratory rate, oximetry, and blood pressure. Capnography may be beneficial in patients requiring significant sedation or in those with moderate to severe lung disease. Arterial blood gas monitoring should be performed for patients with severe disease. Frequent intraoperative and postoperative management of blood sugars is indicated for prolonged procedures. Ventilating pressures should be monitored carefully as patients with CF are at risk for rupture of emphysematous bullae resulting in a pneumothorax (Karlet, M.C. 2000) in the setting of air trapping.

Preoxygenation to achieve higher oxygen saturation before induction is important. History of significant gastroesophageal reflux would require a rapid sequence induction. The short life of

performed by many providers performing bronchoscopies on patients with bronchiectasis and cystic fibrosis. However, due to profound bronchoscopasm often experienced with airway manipulation, consideration for the utilization of anesthesia support should strongly

Little was known initially about the role of general anesthesia in patients with Cystic Fibrosis. Price showed that a marked deterioration in lung function took place after a brief anesthetic for a relatively minor surgical procedure (Price, J.F. 1986). In a retrospective review, Chhajed et al showed that the sedative drug requirements during bronchoscopy were higher in patients with CF, especially after lung transplantation (Chhajed, P.N. 2005). Few authors reviewed the preoperative assessment, intraoperative and postoperative management of patients with CF (Huffmyer, J.L. 2009, Della Rocca, G. 2002, Walsh, T.S. 1995). An anesthetic plan for patients with CF undergoing procedures was described by

The respiratory dysfunction associated with cystic fibrosis should be the major focus of preoperative evaluation by the anesthesiologist. The anesthesiologist should quantify the level of pulmonary function and extent of cardiopulmonary limitation preoperatively and attempts must be made to optimize it prior to the procedure. Historically, the amounts of sputum production, decreased exercise tolerance, decreasing weight are important features. If patients report an increased cough, wheezing, increased sputum production, decreased activity level, infection or other symptoms to suggest CF exacerbation, admission to the hospital for optimization of lung function should be considered. Hypercarbia typically

All cases should receive chest radiograph, pulmonary function testing, serum electrolyte levels including blood glucose levels, complete blood cell count and liver function tests (Della Rocca, G. 2002). Depending on the type of bronchoscopy being performed and the patient's history of liver involvement, further coagulation testing may be ordered. Moreover, arterial blood gas measurements, electrocardiogram, and echocardiogram may

Patient's routine medications including bronchodilators and corticosteroids should be continued into the perioperative period. Sedatives and analgesics should be used cautiously in the preoperative period as they can depress the respiratory drive and patient's inability to clear secretions (Huffmyer, J.L. 2009). Premedication with an antacid such as H2 blocker should be considered as there is a higher incidence of gastroesophageal reflux (Weeks, A.M.

Procedural monitoring should include continuous electrocardiography, respiratory rate, oximetry, and blood pressure. Capnography may be beneficial in patients requiring significant sedation or in those with moderate to severe lung disease. Arterial blood gas monitoring should be performed for patients with severe disease. Frequent intraoperative and postoperative management of blood sugars is indicated for prolonged procedures. Ventilating pressures should be monitored carefully as patients with CF are at risk for rupture of emphysematous bullae resulting in a pneumothorax (Karlet, M.C. 2000) in the

Preoxygenation to achieve higher oxygen saturation before induction is important. History of significant gastroesophageal reflux would require a rapid sequence induction. The short life of

also be performed prior to the procedure if warranted by the patient's history.

be considered in patients with bronchiectasis and cystic fibrosis.

Karlet et al (Karlet, M.C. 2000).

develops late in cystic fibrosis.

1995).

setting of air trapping.

Propofol makes it an ideal choice. Ketamine is relatively contraindicated due to increased bronchial secretions. The advantage of volatile inhalational agents used in general anesthesia is that they cause bronchodilation, decrease muscle relaxant dosage, and reduced airway hyperreactivity. Although Desflurane has an undesired pungent odor and respiratory tract irritability which makes it a poor choice of agent. Systemic hydration and humidification of inspired gasses are important for maintaining secretions in a less viscous state. If muscle relaxants are used short-acting nondepolarizing agents may be more appropriate. They should be administered in minimum possible doses. It should be noted that the aminoglycoside antibiotics use to treat infections might prolong the neuromuscular blocking affect. Extubation should be delayed until the effect of muscle relaxants has worn off.

Anesthesia should be tailored towards rapid postoperative recovery of the ability to cough and take deep breaths to actively clear secretions. Post procedure aggressive suctioning, chest physiotherapy and oxygen supplementation should be continued till the effect of the anesthetic agent has worn off and patient is back to his/her previous state of health.


Adapted from Karlet, 2002

Table 3. Preoperative test for Anesthesia

#### **7. Approach to performing bronchoscopy in bronchiectasis and CF**

Preparation for bronchoscopy in patients with cystic fibrosis or chronic suppurative bronchiectasis is similar to the initial evaluation for anaesthesia. Important aspects include a clear understanding of the indication for bronchoscopy. As the pulmonologist understanding the current and usual steady state of the patients' respiratory function is critical. While there are no clear guidelines to support peri-operative antibiotics these patients may have a higher likelihood of transient bacteraemia or post bronchoscopic febrile episodes. Judicious clinical judgement of the patients overall condition should be followed in determining which patients may benefit from peri-operative antibiotics.

Having a clear understanding of the indications for the procedure in these patients is not only important in weighing risk and benefit but in allowing an expeditious procedure. Patients with advanced obstructive lung disease may have difficulty with hypoxemia and other complications. A well planned procedure will shorten the duration and attempt to mitigate risk.

If the indication is for airway sampling for culture, care must be taken to avoid contamination of the cultures by suctioning in the upper airway. This may be difficult due

Bronchoscopy in Bronchiectasis and Cystic Fibrosis 121

Boogaard, R., et al., Yield from Flexible Bronchoscopy in Pediatric Cystic Fibrosis Patients. *J* 

Brennan, S., C. Gangell, et al. (2008). "Disease surveillance using bronchoalveolar lavage."

Cabello, H., A. Torres, et al. (1997). "Bacterial colonization of distal airways in healthy

Cetin, I., U. Ozcelik, et al. (2004). "BALF nitrite as an indicator of inflammation in children

Chang, A. B., N. C. Boyce, et al. (2002). "Bronchoscopic findings in children with non-cystic

Chhajed, P. N., C. Aboyoun, et al. (2005). "Sedative drug requirements during bronchoscopy

Cobanoglu, N., U. Ozcelik, et al. (2010). "Anti-neutrophil cytoplasmic antibodies (ANCA) in

Cohen, M. and S. A. Sahn (1999). "Bronchiectasis in systemic diseases." *Chest* 116(4): 1063-

Dahm, L. S., C. W. Ewing, et al. (1977). "Comparison of three techniques of lung lavage in

Davis, S. D., L. A. Fordham, et al. (2007). "Computed tomography reflects lower airway

de Blic, J., F. Midulla, et al. (2000). "Bronchoalveolar lavage in children. ERS Task Force on

Della Rocca, G., Anaesthesia in patients with cystic fibrosis. *Curr Opin Anaesthesiol*, 2002.

Dikensoy, O., C. Usalan, et al. (2002). "Foreign body aspiration: clinical utility of flexible

Einarsson, J. T., J. G. Einarsson, et al. (2009). "Middle lobe syndrome: a nationwide study on clinicopathological features and surgical treatment." *Clin Respir J* 3(2): 77-81. Fernald, G. W. (1978). "Bronchiectasis in childhood: a 10-year survey of cases treated at

Flume, P. A., P. J. Mogayzel, Jr., et al. (2010). "Cystic fibrosis pulmonary guidelines:

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Hilliard, T. N., S. Sukhani, et al. (2007). "Bronchoscopy following diagnosis with cystic

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to the tenacious sputum and upper airway secretions in patients with cystic fibrosis. This is usually less of an issue in those with suppurative bronchiectasis. Strong consideration should be given to protected brush specimen retrieval in all these patients. Ensuring rapid and appropriate transport to the laboratory and rapid plating will significantly aid in obtaining viable culture specimens.

Patients with chronic suppuration coincident with bronchiectasis may have mucosa that is particularly friable. Having a seasoned bronchoscopist is the best choice to avoid mucosal injury and provide the shortest procedural time. These patients are likely not the best candidates for early trainees in bronchoscopy or those who rarely perform bronchoscopy. When these patients present with haemoptysis localization may be critical to guiding bronchial or intercostals arterial embolization. In addition, visualization of a more proximal bleed can occasionally occur. In these cases endobronchial therapies are warranted. The authors would recommend non contact therapies such as argon plasma coagulation or very low wattage Nd:YAG laser. If the indication for the bronchoscopy is mucosal sampling for ciliary dyskinesias a critical step is ensuring the correct specimen handling procedures are known and strictly followed. Most laboratories do not routinely process specimen's electron micrography. Ensuring good pre-procedural communication cannot be understated.

With the advancing population age of cystic fibrosis patients and the presence of bronchiectasis in middle age or older individuals the potential of central airway obstruction must be considered. Both primary bronchogenic carcinoma and metastatic airway disease may occur. Therapeutic bronchoscopy should be considered for these patients if central airway obstruction is due to endobronchial tumor. Therapeutic decision-making, such as risk to benefit of placing a endobronchial foreign body in a suppurative airway makes these cases extremely challenging. The authors would recommend referral to an interventional pulmonologist in a "center of excellence" to provide the best care for these complicated patients. Endoluminal ablative therapies are not contraindicated in these patients but experience is fairly limited. A center with a high volume of therapeutic bronchoscopy is likely the best choice.

#### **8. Conclusions**

Bronchoscopy provides useful diagnostic information in patients with bronchiectasis and Cystic Fibrosis. The use of these techniques aids the clinician in preventing the considerable morbidity associated with these conditions, and a proper understanding of the intricices of bronchoscopic procedures in these patients is paramount to success.

#### **9. References**


Barker, A. F. (2002). "Bronchiectasis." *N Engl J Med* 346(18): 1383-1393.

Baughman, R. P., D. A. Keeton, et al. (1997). "Use of bronchoalveolar lavage semiquantitative cultures in cystic fibrosis." *Am J Respir Crit Care Med* 156(1): 286- 291.

to the tenacious sputum and upper airway secretions in patients with cystic fibrosis. This is usually less of an issue in those with suppurative bronchiectasis. Strong consideration should be given to protected brush specimen retrieval in all these patients. Ensuring rapid and appropriate transport to the laboratory and rapid plating will significantly aid in

Patients with chronic suppuration coincident with bronchiectasis may have mucosa that is particularly friable. Having a seasoned bronchoscopist is the best choice to avoid mucosal injury and provide the shortest procedural time. These patients are likely not the best candidates for early trainees in bronchoscopy or those who rarely perform bronchoscopy. When these patients present with haemoptysis localization may be critical to guiding bronchial or intercostals arterial embolization. In addition, visualization of a more proximal bleed can occasionally occur. In these cases endobronchial therapies are warranted. The authors would recommend non contact therapies such as argon plasma coagulation or very low wattage Nd:YAG laser. If the indication for the bronchoscopy is mucosal sampling for ciliary dyskinesias a critical step is ensuring the correct specimen handling procedures are known and strictly followed. Most laboratories do not routinely process specimen's electron

micrography. Ensuring good pre-procedural communication cannot be understated.

With the advancing population age of cystic fibrosis patients and the presence of bronchiectasis in middle age or older individuals the potential of central airway obstruction must be considered. Both primary bronchogenic carcinoma and metastatic airway disease may occur. Therapeutic bronchoscopy should be considered for these patients if central airway obstruction is due to endobronchial tumor. Therapeutic decision-making, such as risk to benefit of placing a endobronchial foreign body in a suppurative airway makes these cases extremely challenging. The authors would recommend referral to an interventional pulmonologist in a "center of excellence" to provide the best care for these complicated patients. Endoluminal ablative therapies are not contraindicated in these patients but experience is fairly limited. A center with a high volume of therapeutic bronchoscopy is

Bronchoscopy provides useful diagnostic information in patients with bronchiectasis and Cystic Fibrosis. The use of these techniques aids the clinician in preventing the considerable morbidity associated with these conditions, and a proper understanding of the intricices of

Aaron, S. D., D. Kottachchi, et al. (2004). "Sputum versus bronchoscopy for diagnosis of Pseudomonas aeruginosa biofilms in cystic fibrosis." *Eur Respir J* 24(4): 631-637. Albo, R. J. and O. F. Grimes (1966). "The middle lobe syndrome: a clinical study." *Dis Chest*

Baughman, R. P., D. A. Keeton, et al. (1997). "Use of bronchoalveolar lavage

semiquantitative cultures in cystic fibrosis." *Am J Respir Crit Care Med* 156(1): 286-

bronchoscopic procedures in these patients is paramount to success.

Barker, A. F. (2002). "Bronchiectasis." *N Engl J Med* 346(18): 1383-1393.

obtaining viable culture specimens.

likely the best choice.

**8. Conclusions** 

**9. References** 

50(5): 509-518.

291.


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Quast, T. M., A. R. Self, et al. (2008). "Diagnostic evaluation of bronchiectasis." *Dis Mon* 54(8):

Regamey, N., T. N. Hilliard, et al. (2007). "Quality, size, and composition of pediatric

Rosenfeld, M., R. L. Gibson, et al. (2001). "Early pulmonary infection, inflammation, and clinical outcomes in infants with cystic fibrosis." *Pediatr Pulmonol* 32(5): 356-366.

Sheikh, S., K. Madiraju, et al. (1997). "Bronchiectasis in pediatric AIDS." *Chest* 112(5): 1202-

Slattery, D. M., D. A. Waltz, et al. (2001). "Bronchoscopically administered recombinant

Stafler, P., J. C. Davies, et al. (2011). "Bronchoscopy in Cystic Fibrosis Infants Diagnosed by

Stern, R. C., T. F. Boat, et al. (1978). "Treatment and prognosis of lobar and segmental

Tan, Y. K., A. S. Lee, et al. (1999). "Rapid mycobacterial tuberculosis detection in

Wagner, R. B. and M. R. Johnston (1983). "Middle lobe syndrome." *Ann Thorac Surg* 35(6):

Wainwright, C. E., K. Grimwood, et al. (2008). "Safety of bronchoalveolar lavage in young

Wainwright, C.E.,S. Vidmar, et al. (2011). " Effect of Bronchoalveolar Lavage–directed

children with Cystic Fibrosis: A randomized trial ." *JAMA* 306(2):163-171. Walsh, T.S. and C.H. Young, Anaesthesia and cystic fibrosis. *Anaesthesia,* 1995. 50(7): p. 614-

Watanabe, Y., S. Murakami, et al. (1997). "Treatment of bronchial stricture due to

Watanuki, Y., S. Odagiri, et al. (1999). "Usefulness of bronchoscopy for the diagnosis of atypical pulmonary mycobacteriosis." *Kansenshogaku Zasshi* 73(8): 728-733. Webb, W.R. (2009) *High Resolution CT of the lung* (4th Edition) Lippincott Williams &

Weeks, A.M. and M.R. Buckland, Anaesthesia for adults with cystic fibrosis. *Anaesth* 

Weycker, D., J. Edelsberg, et al. (2005). "Prevalence and Economic Burden of Bronchiectasis."

Whitaker, P., K. Brownlee, et al. (2011). "Sequential Bronchoscopy in the Management of

Whittaker, L. A. and C. Teneback (2009). "Atypical mycobacterial and fungal infections in

Lobar Atelectasis Secondary to Allergic Bronchopulmonary Aspergillosis." *Journal* 

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children with cystic fibrosis." *Pediatr Pulmonol* 43(10): 965-972.

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Wilkins, ISBN-13: 978-0-7817-6909-4, Philadelphia, USA

*of Bronchology & Interventional Pulmonology* 18(1): 57-60

cystic fibrosis." *Semin Respir Crit Care Med* 30(5): 539-546.

human DNase for lobar atelectasis in cystic fibrosis." *Pediatr Pulmonol* 31(5): 383-

bronchoalveolar lavage samples by polymerase chain reaction in patients with upper lobe infiltrates and bronchiectasis." *Ann Acad Med Singapore* 28(2): 205-208. Tanaka, E., R. Amitani, et al. (1997). "Yield of computed tomography and bronchoscopy for

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therapy on Pseudomonas aeruginosa infection and structural lung injury in

endobronchial biopsies in cystic fibrosis." *Chest* 131(6): 1710-1717.

Rowe, S. M., S. Miller, et al. (2005). "Cystic fibrosis." *N Engl J Med* 352(19): 1992-2001.

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Joseph, P. M., B. P. O'Sullivan, et al. (2001). "Aerosol and lobar administration of a

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McLaughlin, A. M., E. McGrath, et al. (2008). "Treatment of lobar atelectasis with

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Muhlebach, M. S., M. B. Miller, et al. (2006). "Are lower airway or throat cultures predictive of sinus bacteriology in cystic fibrosis?" *Pediatr Pulmonol* 41(5): 445-451. Murray, J.F., Nadal, J.A. (2010) *Murray & Nadal's Textbook of Respiratory Medicine* (5th Edition)

Noah, T. L., P. C. Murphy, et al. (2003). "Bronchoalveolar lavage fluid surfactant protein-A

Pang, J. A., A. Cheng, et al. (1989). "The bacteriology of bronchiectasis in Hong Kong

Pasteur, M. C., D. Bilton, et al. (2010). "British Thoracic Society guideline for non-CF

Perricone, M. A., J. E. Morris, et al. (2001). "Aerosol and lobar administration of a

Price, J. F. (1986). "The need to avoid general anaesthesia in cystic fibrosis." *J R Soc Med* 79

Priftis, K. N., D. Mermiri, et al. (2005). "The role of timely intervention in middle lobe

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and surfactant protein-D are inversely related to inflammation in early cystic

investigated by protected catheter brush and bronchoalveolar lavage." *Am Rev* 

recombinant adenovirus to individuals with cystic fibrosis. II. Transfection

Saunders, Elsevier, ISBN: 978-1-4160-47100-0, Philadelphia, USA

detection of early cystic fibrosis lung disease." *Paediatr Respir Rev* 9(3): 168-174; quiz

application of SELDI-TOF mass spectrometry to BAL fluid." *J Cyst Fibros* 7(5): 352-

bronchoscopically administered recombinant human deoxyribonuclease in cystic

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68(2): 141-148.

174-165.

358.


**Section 4** 

**Evolving Therapeutic Uses of Bronchoscopy** 

Wood, R. E., S. R. Lacey, et al. (1992). "Endoscopic management of large, postresection bronchopleural fistulae with methacrylate adhesive (Super Glue)." *J Pediatr Surg*  27(2): 201-202.

## **Section 4**

**Evolving Therapeutic Uses of Bronchoscopy** 

124 Global Perspectives on Bronchoscopy

Wood, R. E., S. R. Lacey, et al. (1992). "Endoscopic management of large, postresection

27(2): 201-202.

bronchopleural fistulae with methacrylate adhesive (Super Glue)." *J Pediatr Surg* 

**7** 

*México* 

**Endotracheal Intubation with** 

**Flexible Fiberoptic Bronchoscope** 

**(FFB) in Cases of Difficult Airway** 

*Departament of Thoracic Endoscopy, Pneumology and Thoracic Surgery Service* 

Endotracheal intubation is a procedure whereby a tube is inserted into the trachea to warrant and maintain adequate ventilation with good respiratory gas exchange in patients who undergo anesthesia for surgery or require invasive mechanical ventilation.Since 1967 the flexible fiberoptic bronchoscope was considered as an advanced device to intubate patients with difficult airway having surgery,"fiberoptic assisted tracheal intubation".1

In most cases,tracheal intubation is done by oral laryngoscopy performed with a rigid laryngoscope,2 but there are cases in which the intubation attempt fails due to the presence of difficult airway. This problem occurs in 1/22,000 cases of general anesthesia and is the most frequent serious airway complication.3 Among 37,482 intubation attempts by direct laryngoscopy for general anaesthesia, 161 (0.43%) cases could not be intubated because of being overly difficult as mentioned by Burke.4 Other authors report 6/13,380 cases but in

The definition of difficult airway according to the American Society of Anesthesiologists Task Force on Management of the Difficult Airway is "a clinical situation in which a conventionally trained anesthesiologist experiences difficulty with face mask ventilation of the upper airway, difficulty with tracheal intubation or both."6 Under these conditions, intubation must be attempted with another technique or must be postponed because a lifethreatening situation may arise if the anesthesiologist is unable to intubate and cannot ventilate. Use of FFB is then indicated for tracheal intubation as an emergency measure.

A difficult intubation can be predicted and avoided with a proper and careful preoperative evaluation of the airway by a skilled anesthesiologist. The clinical record and history of previous episodes of failed intubation during anesthesia for surgical interventions are important.7 A first question must be answered: Are the larynx and vocal cords visible? If

obstetric patients it has been reported to be 1/300 cases.5

**2. General considerations Evaluation of the patient's airway** 

**1. Introduction** 

Francisco Navarro, Raúl Cicero and Andrea Colli

*General Hospital of México OD, Faculty of Medicine,* 

*National Autonomous University of Mexico* 

## **Endotracheal Intubation with Flexible Fiberoptic Bronchoscope (FFB) in Cases of Difficult Airway**

Francisco Navarro, Raúl Cicero and Andrea Colli *Departament of Thoracic Endoscopy, Pneumology and Thoracic Surgery Service General Hospital of México OD, Faculty of Medicine, National Autonomous University of Mexico México* 

#### **1. Introduction**

Endotracheal intubation is a procedure whereby a tube is inserted into the trachea to warrant and maintain adequate ventilation with good respiratory gas exchange in patients who undergo anesthesia for surgery or require invasive mechanical ventilation.Since 1967 the flexible fiberoptic bronchoscope was considered as an advanced device to intubate patients with difficult airway having surgery,"fiberoptic assisted tracheal intubation".1

In most cases,tracheal intubation is done by oral laryngoscopy performed with a rigid laryngoscope,2 but there are cases in which the intubation attempt fails due to the presence of difficult airway. This problem occurs in 1/22,000 cases of general anesthesia and is the most frequent serious airway complication.3 Among 37,482 intubation attempts by direct laryngoscopy for general anaesthesia, 161 (0.43%) cases could not be intubated because of being overly difficult as mentioned by Burke.4 Other authors report 6/13,380 cases but in obstetric patients it has been reported to be 1/300 cases.5

The definition of difficult airway according to the American Society of Anesthesiologists Task Force on Management of the Difficult Airway is "a clinical situation in which a conventionally trained anesthesiologist experiences difficulty with face mask ventilation of the upper airway, difficulty with tracheal intubation or both."6 Under these conditions, intubation must be attempted with another technique or must be postponed because a lifethreatening situation may arise if the anesthesiologist is unable to intubate and cannot ventilate. Use of FFB is then indicated for tracheal intubation as an emergency measure.

#### **2. General considerations**

#### **Evaluation of the patient's airway**

A difficult intubation can be predicted and avoided with a proper and careful preoperative evaluation of the airway by a skilled anesthesiologist. The clinical record and history of previous episodes of failed intubation during anesthesia for surgical interventions are important.7 A first question must be answered: Are the larynx and vocal cords visible? If

Endotracheal Intubation with Flexible Fiberoptic

evaluation of the airway.

Bronchoscope (FFB) in Cases of Difficult Airway 129

suggests a difficult intubation are the primary candidates for scheduling FFB intubation. Some examples are morbid obesity,trismus, facial trauma, pharynx and larynx injury, limited flexion and extension of the neck, craniofacial disorders, jaw malformations, temporomandibular joint ankylosis, macroglossia, larynx tumors, laryngo-tracheobronchitis, glottic edema and epiglottitis along with other unexpected conditions. An emergency intubation carried out in the ICU or in the emergency department lacks proper previous

Fig. 2. Some examples of candidates for FFB endotracheal intubation. a) morbid obesity with

FFB intubation is better performed with the assistance of a video magnification screen in the operating room.15 In the ICU it is not always possible and must be done by direct vision in the FFB with a second observer device for the assistant Proper monitoring of

In every case of intubation with FFB, the bronchoscopist must work in complete coordination and communication with anesthesiologists and intensive care physicians.

short neck, b) prominent incisors teeth and micrognatia, c)facial trauma, d)cervical

electrocardiogram , oximetry, arterial pressure and capnography is always required.

ankylosis, e)macroglossia, f) Mallampati IV (Ref 13)

Fig. 1. Normal airway and difficult airway,Cormack-Lehane and Mallampati.The visualization or not of retropharynx and vocal cords is important to predict difficult airway.(Ref 14) Failure of intubation with rigid laryngoscope due to impossible visualization of the larynx is indication for FFB endotracheal intubation.

not, the possibility of difficult tracheal intubation may be identified during the preanesthetic evaluation.8 However, a difficult tracheal intubation is sometimes unpredictable whether occurring in the operating room, the intensive care unit (ICU) or in the emergency department.9 This is certainly true in cases of an oropharyngeal condition that does not allow epiglottis and vocal cord visualization. These cases were previously classified as difficult airway according to the original Mallampati10 classification or the modified classification.11 In cases with limited mouth opening or restricted mobility of the head and neck, evaluation of anatomic conditions is also mandatory. A more accurate evaluation may be done by computerized facial analysis in challenging intubations.12 If a difficult airway is present, use of FFB may be anticipated.

#### **3. Airway assessment**

Anatomic conditions and mobility of the head and neck are important13 as well as imaging with X-ray. Airway exploration must be made in all cases according to ASA recommendations, with particular attention to mouth opening, Mallampati classification, Cormak-Lehane, thyromental distance or other methods.14 Patency of the nose is important, but under emergency situations it may be impossible to perform this assessment.

#### **4. Common indications for endotracheal intubation with FFB**

FFB intubation is indicated and appropriately scheduled in cases diagnosed as difficult airway or as an emergency procedure. Patients in whom previous evaluation of the airway

Fig. 1. Normal airway and difficult airway,Cormack-Lehane and Mallampati.The visualization or not of retropharynx and vocal cords is important to predict difficult airway.(Ref 14) Failure of intubation with rigid laryngoscope due to impossible visualization of the larynx is indication for FFB endotracheal intubation.

present, use of FFB may be anticipated.

**3. Airway assessment** 

not, the possibility of difficult tracheal intubation may be identified during the preanesthetic evaluation.8 However, a difficult tracheal intubation is sometimes unpredictable whether occurring in the operating room, the intensive care unit (ICU) or in the emergency department.9 This is certainly true in cases of an oropharyngeal condition that does not allow epiglottis and vocal cord visualization. These cases were previously classified as difficult airway according to the original Mallampati10 classification or the modified classification.11 In cases with limited mouth opening or restricted mobility of the head and neck, evaluation of anatomic conditions is also mandatory. A more accurate evaluation may be done by computerized facial analysis in challenging intubations.12 If a difficult airway is

Anatomic conditions and mobility of the head and neck are important13 as well as imaging with X-ray. Airway exploration must be made in all cases according to ASA recommendations, with particular attention to mouth opening, Mallampati classification, Cormak-Lehane, thyromental distance or other methods.14 Patency of the nose is important,

FFB intubation is indicated and appropriately scheduled in cases diagnosed as difficult airway or as an emergency procedure. Patients in whom previous evaluation of the airway

but under emergency situations it may be impossible to perform this assessment.

**4. Common indications for endotracheal intubation with FFB** 

suggests a difficult intubation are the primary candidates for scheduling FFB intubation. Some examples are morbid obesity,trismus, facial trauma, pharynx and larynx injury, limited flexion and extension of the neck, craniofacial disorders, jaw malformations, temporomandibular joint ankylosis, macroglossia, larynx tumors, laryngo-tracheobronchitis, glottic edema and epiglottitis along with other unexpected conditions. An emergency intubation carried out in the ICU or in the emergency department lacks proper previous evaluation of the airway.

Fig. 2. Some examples of candidates for FFB endotracheal intubation. a) morbid obesity with short neck, b) prominent incisors teeth and micrognatia, c)facial trauma, d)cervical ankylosis, e)macroglossia, f) Mallampati IV (Ref 13)

FFB intubation is better performed with the assistance of a video magnification screen in the operating room.15 In the ICU it is not always possible and must be done by direct vision in the FFB with a second observer device for the assistant Proper monitoring of electrocardiogram , oximetry, arterial pressure and capnography is always required.

In every case of intubation with FFB, the bronchoscopist must work in complete coordination and communication with anesthesiologists and intensive care physicians.

Endotracheal Intubation with Flexible Fiberoptic

of the patient before the FFB can be withdrawn(Table 2).

4. Advance of the FFB until the glottis is visible. 5. Introduction of the FFB into the trachea.

Table 2. Technique for tracheal intubation with FFB

endotracheal intubation. The FFB is inserted in the tube.

**8. Intubation in the ICU and emergency department** 

6. Slide the tube until reaching the distal tip of the FFB.

8. Extraction of the FFB, retaining the tube within the trachea. 9. Fixation of the tube to the face, avoiding unplanned extubation. 10. Finally, tracheal tube is immediately connected to the oxygen source.

1. Selecting FFB and endotracheal tube

Bronchoscope (FFB) in Cases of Difficult Airway 131

This event occurs in the operating room. The patient must be oxygenated as quickly as possible. Monitoring by oximetry and capnography must be maintained. The head must be immobilized with a pillow placed under the neck. The bronchoscopist immediately introduces the FFB by mouth or nose, previously inserted in the selected tracheal tube and well lubricated. The FFB must be introduced until the glottis can be seen and the instrument inserted and the tracheal lumen visualized. The tube is slide gently and introduced into the trachea until reaching the distal tip of the FFB. Together these are pushed into the tracheal lumen, reaching the middle third of the trachea. The tube should be fixed firmly at the face

**7. Emergency intubation after failure to intubate by direct laryngoscopy** 

2. Insertion of the FFB into the lumen of the tracheal tube (lubrication is essential). 3. Introduction of the FFB through the nose or oral cavity with a mouthguard.

7. Introduction of the FFB and the tube until reaching the middle third of the trachea.

Note: All steps must be done gently and quickly to recover efficient ventilation of the patient.

Fig. 3. Introduction of the FFB and the tracheal tube through the nose a)or mouth b) for FFB

Failure to intubate occurred in 0.07% to 3.4% of all intubation attempts in the ICU.19 Critically ill patients are unstable, cannot cooperate, and have no prior airway assessment. Some difficulties arise because the patient is surrounded by monitoring and mechanical respiration devices. The bronchoscopist may be in a cumbersome bedside situation at the

### **5. Awake intubation and anticipated intubation with the FFB**

Awake intubation with FFB requires informed consent about the procedure and the risks along with complete cooperation of the individual during the procedure. Confidence between the operator and the patient is also essential.

In predicting difficult intubation,scheduled cases may be better subjected to the procedure in the supine position as a safer and more comfortable measure, with the use of supplemental oxygen.16 Local anesthesia is easily applied with 2% lidocaine spray. In difficult cases, previous instillation of 3 to 5 mL of 2% lidocaine solution through the nose may be useful. Phenylephrine as vasoconstrictor is advisable to apply in the nose. A sedative such as midazolam or diazepam may be employed. If the mouth opening is limited or restricted, transnasal approach would be the appropriate choice. Gentle manipulation from the operator is required in patients with spontaneous breathing. Before initiating the procedure, the FFB is previously inserted into the selected endotracheal tube as recommended by Stubb and McDougal,17 then is introduced through the mouth or nose .Instillation of lidocaine solution in the working channel is useful to avoid cough and nausea. Once the FFB is in the trachea the tube is slided over the endoscope. The FFB is removed and the tube is left in the trachea. Manipulation and transport of the patient must be done with extreme care to prevent an unexpected extubation. The approach with a nasopharyngeal trumpet to the glottis followed by the insertion of the FFB and the tube in the trachea may also be used.18 Basic endoscopic equipment must always be available (Table 1).


8. Cardiac arrest equipment is always important

Table 1. Portable airway trolley: Basic equipment

#### **6. Intubation with the patient under general anesthesia**

Intubation under general anesthesia always requires 100% oxygen supply with an adaptor or jet injection device. It must be done carefully and quickly. Careful head and neck immobilization is necessary, preferably through oral access if there are no contraindications.

Awake intubation with FFB requires informed consent about the procedure and the risks along with complete cooperation of the individual during the procedure. Confidence

In predicting difficult intubation,scheduled cases may be better subjected to the procedure in the supine position as a safer and more comfortable measure, with the use of supplemental oxygen.16 Local anesthesia is easily applied with 2% lidocaine spray. In difficult cases, previous instillation of 3 to 5 mL of 2% lidocaine solution through the nose may be useful. Phenylephrine as vasoconstrictor is advisable to apply in the nose. A sedative such as midazolam or diazepam may be employed. If the mouth opening is limited or restricted, transnasal approach would be the appropriate choice. Gentle manipulation from the operator is required in patients with spontaneous breathing. Before initiating the procedure, the FFB is previously inserted into the selected endotracheal tube as recommended by Stubb and McDougal,17 then is introduced through the mouth or nose .Instillation of lidocaine solution in the working channel is useful to avoid cough and nausea. Once the FFB is in the trachea the tube is slided over the endoscope. The FFB is removed and the tube is left in the trachea. Manipulation and transport of the patient must be done with extreme care to prevent an unexpected extubation. The approach with a nasopharyngeal trumpet to the glottis followed by the insertion of the FFB and the tube in the trachea may also be used.18 Basic endoscopic

1. Every operating room or intensive care unit must have the facilities for intubation under bronchoscopic visualization: FFB of different lengths and diameters should be available. FFB Olympus P60 and 1T60 with 6.0 mm outer diameter or MP60 4.4 mm are suitable in the majority of cases. Ultraslim 3C40 of 3,6 mm and N20 with 2.2 mm are used in cases with

3. Tracheal tubes of different diameters must be available (4.0 mm to 10 mm) (Rush–Magill).

4. Lidocaine solution 2%-4%. Lubricating the FFB with with lidocaine 2% gel warrants the

7. Tracheostomy cannulae, may be percutaneous, with proper equipment for its insertion in

Intubation under general anesthesia always requires 100% oxygen supply with an adaptor or jet injection device. It must be done carefully and quickly. Careful head and neck immobilization is necessary, preferably through oral access if there are no contraindications.

All endoscopic instruments must be tested to verify their good conditions.

6. Suction devices: A Yankauer cannula connected to a suction power source.

**5. Awake intubation and anticipated intubation with the FFB** 

between the operator and the patient is also essential.

equipment must always be available (Table 1).

major grade of glottic stenoses.

cases of impossible intubation.

2. Portable light source of halogen or xenon.

sliding of the endoscope inside the tube. 5. Neuromuscular relaxants and sedatives.

8. Cardiac arrest equipment is always important Table 1. Portable airway trolley: Basic equipment

**6. Intubation with the patient under general anesthesia** 

Also, armored PVC spiral tubes must be considered.

#### **7. Emergency intubation after failure to intubate by direct laryngoscopy**

This event occurs in the operating room. The patient must be oxygenated as quickly as possible. Monitoring by oximetry and capnography must be maintained. The head must be immobilized with a pillow placed under the neck. The bronchoscopist immediately introduces the FFB by mouth or nose, previously inserted in the selected tracheal tube and well lubricated. The FFB must be introduced until the glottis can be seen and the instrument inserted and the tracheal lumen visualized. The tube is slide gently and introduced into the trachea until reaching the distal tip of the FFB. Together these are pushed into the tracheal lumen, reaching the middle third of the trachea. The tube should be fixed firmly at the face of the patient before the FFB can be withdrawn(Table 2).


6. Slide the tube until reaching the distal tip of the FFB.


Note: All steps must be done gently and quickly to recover efficient ventilation of the patient.

Table 2. Technique for tracheal intubation with FFB

Fig. 3. Introduction of the FFB and the tracheal tube through the nose a)or mouth b) for FFB endotracheal intubation. The FFB is inserted in the tube.

#### **8. Intubation in the ICU and emergency department**

Failure to intubate occurred in 0.07% to 3.4% of all intubation attempts in the ICU.19 Critically ill patients are unstable, cannot cooperate, and have no prior airway assessment. Some difficulties arise because the patient is surrounded by monitoring and mechanical respiration devices. The bronchoscopist may be in a cumbersome bedside situation at the

Endotracheal Intubation with Flexible Fiberoptic

Business.2009:pp.3-26

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2003;98:1269-1277.

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York, Springer Verlag; 2003. pp. 214-254

**15. Conclusions** 

this technique.

**16. References** 

631.

Bronchoscope (FFB) in Cases of Difficult Airway 133

All patients classified as having a difficult airway must be considered as potential candidates for endotracheal intubation with FFB as well as patients with failed intubation in anesthesia, intensive care unit and the emergency department. Bronchoscopy must be performed by an experienced and skilled endoscopist. There is a high rate of success using

[1] Jabob AK, Kopp SL,Bacon DR, Smith HM. History of Anesthesia. In "Clinical

[2] Brendan T, Finucane T, Santora AH. Principles of airway management. 3rd ed. New

[3] Cook TM, Woodall N, Frerk C. Major complications of airway management in the UK.

[4] Burke C, Walsh MT, Harrison BA, Curry TB, Rose BH. Airway management after failure

[5] Cormack RS, Lehane J. Difficult tracheal intubation in obstetrics. Anaesthesia

[6] American Society of Anesthesiologists. Practice guidelines for management of the

[7] Samsoon GLT, Young JRB. Difficult tracheal intubation: a retrospective study. Anesth

[8] Wilson MF, Spiegelhalter D, Robertson JA, Lesser P. Predicting difficult intubation. Br J

[9] Bair AE, Caravelli R, Tyler K. Feasibility of the preoperative Mallampati airway assessment in emergency department patients. J Emerg Med 2011;38:677-680. [10] Mallampati SR, Gatt SP, Guggino LD, Desair S, Waraska B, Freiberger D. A clinical sign

[11] Lee A, Fan LTY, Gin T, Karmakar MK, Kee WDN. A systematic review (meta-analysis)

[12] Connor C, Segal S. Accurate classification of difficult intubation by computerized facial

[13] Elizondo E, Navarro F, Pérez-Romo A, Ortega C, Muñoz H, Cicero R. Endotracheal

Anesthesia" 6th ed. Barash PG, Cullen BK, Stoelting RK, Cahalan MK, Stock MG Editors. Philadelphia. Lippincott.William & Wilkins. Wolter Kluwer

Results of the Fourth National Audit Project of the Royal College of Anaesthetists and the Difficult Airway Society. Part 1: Anaesthesia. Br J Anaesth 2011;106:617-

to intubate by direct laryngoscopy: outcomes in a large teaching hospital. Can J

difficult airway. An updated report by the American Society of Anesthesiologist Task Force on Management of the Difficult Airway. Anesthesiology (Special article)

to predict difficult tracheal intubation. A prospective study. Can Anaesth Soc J

of the accuracy of the Mallamapati tests to predict the difficult airway. Anesth

intubation with flexible fiberoptic bronchoscopy in patients with abnormal anatomic conditions of the head and neck. Ear Nose Throat J 2007;86:682-684.

time of the maneuver with the FFB. Use of neuromuscular blocking agents, induction drugs as etomidate, lidocaine and scopolamine are recommended.20 An assistant must hold the endotracheal tube to prevent unplanned extubation. Despite these difficulties, the FFB can be easily introduced in the majority of cases. The FFB must be removed immediately after a successful tracheal intubation to prevent oxygen desaturation and increase of partial pressure of carbon dioxide (PaCO2) because the presence of the endoscope within the endotracheal tube may obstruct proper ventilation.21,22,23

#### **9. Oral or transnasal bronchoscopy?**

Oral access has the advantage of introducing tubes with wider diameters. Transnasal approach requires the use of more thin tubes. These procedures are well tolerated and comfortable for the patient.

#### **10. Patient recovery**

Tracheal tubes cannot be removed until the patient is completely recovered with an effective cough reflex. If the patient must remain intubated, a bronchoscopic examination for testing the patency of the tube is indicated.

#### **11. Complications**

Use of FFB in tracheal intubation is generally safe. Epistaxis is a relatively common problem in transnasal insertion. Injury of the retropharyngeal wall, epiglottis or vocal cords may occur. Rarely, the working channel may be obstructed by thick secretions or clots. Laryngospasm, bronchospasm, nausea, vomiting, tachycardia and bradycardia due to vagal reflex may also be present.

Endoscopes can be damaged with improper manipulation.

#### **12. Contraindications**

If it is not possible to introduce the FFB in laryngeal and tracheal stenosis it is contraindicated to attempt FFB intubation. If a narrow tracheal channel persists, thin catheters may be introduced with the aid of an ultrathin FFB.

#### **13. Removing the tracheal tube**

Before removing a tracheal tube, a bronchoscopic examination may be required in order to identify complications related to intubation. It is advisable to remove the tube with the FFB inside to allow visualization of the complete tracheal lumen. Reintubation is a risk that must be taken into consideration in extremely difficult cases. Chest X-ray is advisable after extubation.

#### **14. Advantages of using the FFB**

FOB intubation is a nontraumatic procedure. Injury is a rare complication during careful introduction of the FFB and tracheal tube. Manipulation by a trained bronchoscopist generally is rapid and safe.

#### **15. Conclusions**

132 Global Perspectives on Bronchoscopy

time of the maneuver with the FFB. Use of neuromuscular blocking agents, induction drugs as etomidate, lidocaine and scopolamine are recommended.20 An assistant must hold the endotracheal tube to prevent unplanned extubation. Despite these difficulties, the FFB can be easily introduced in the majority of cases. The FFB must be removed immediately after a successful tracheal intubation to prevent oxygen desaturation and increase of partial pressure of carbon dioxide (PaCO2) because the presence of the endoscope within the

Oral access has the advantage of introducing tubes with wider diameters. Transnasal approach requires the use of more thin tubes. These procedures are well tolerated and

Tracheal tubes cannot be removed until the patient is completely recovered with an effective cough reflex. If the patient must remain intubated, a bronchoscopic examination for testing

Use of FFB in tracheal intubation is generally safe. Epistaxis is a relatively common problem in transnasal insertion. Injury of the retropharyngeal wall, epiglottis or vocal cords may occur. Rarely, the working channel may be obstructed by thick secretions or clots. Laryngospasm, bronchospasm, nausea, vomiting, tachycardia and bradycardia due to vagal

If it is not possible to introduce the FFB in laryngeal and tracheal stenosis it is contraindicated to attempt FFB intubation. If a narrow tracheal channel persists, thin

Before removing a tracheal tube, a bronchoscopic examination may be required in order to identify complications related to intubation. It is advisable to remove the tube with the FFB inside to allow visualization of the complete tracheal lumen. Reintubation is a risk that must be taken into consideration in extremely difficult cases. Chest X-ray is advisable after

FOB intubation is a nontraumatic procedure. Injury is a rare complication during careful introduction of the FFB and tracheal tube. Manipulation by a trained bronchoscopist

endotracheal tube may obstruct proper ventilation.21,22,23

Endoscopes can be damaged with improper manipulation.

catheters may be introduced with the aid of an ultrathin FFB.

**9. Oral or transnasal bronchoscopy?** 

comfortable for the patient.

the patency of the tube is indicated.

**10. Patient recovery** 

**11. Complications** 

reflex may also be present.

**12. Contraindications** 

extubation.

**13. Removing the tracheal tube** 

**14. Advantages of using the FFB** 

generally is rapid and safe.

All patients classified as having a difficult airway must be considered as potential candidates for endotracheal intubation with FFB as well as patients with failed intubation in anesthesia, intensive care unit and the emergency department. Bronchoscopy must be performed by an experienced and skilled endoscopist. There is a high rate of success using this technique.

#### **16. References**


**8** 

*Japan* 

**Bronchoscopic Balloon Dilation (BBD)** 

**for Benign Tracheobronchial Stenosis** 

Eriko Suzuki, Hiroshi Haneda, Naoko Yoshii and Hisanori Kani

Bronchoscopic balloon dilation (BBD) is a useful method of treating tracheobronchial stenosis. Tracheobronchial stenosis in adults can arise from benign or malignant disease. Benign stenosis causes include sarcoidosis, tuberculosis, Wegener's granulomatosis, trauma, berylliosis, and foreign body reaction. Furthermore, it can arise after prolonged endotracheal intubation, after sleeve resection or after lung transplantation. Despite adequate systemic therapy, airway stenosis may progress due to tuberculosis or sarcoidosis. In infants, prior use of endobronchial and tracheostomy tubes or congenital stenosis from complete cartilaginous rings are the primary reasons for such stenosis (McDonald & Stocks, 1965; Parkin ea al., 1976). Subglottic or tracheal sites are thus common and may continue to present serious and often fatal respiratory problems in infants. In adults, the etiologies are variable and the stricture can happen in any part of the airway. Tracheobronchial stenosis may produce symptoms such as dyspnea, cough, wheeze, stridor, or recurrent lower respiratory tract infections, and these symptoms cause the airway stricture to mimic asthma. There are various treatments including surgical resection, laser resection, and bougie dilation during rigid bronchoscopy. For lesions causing impending respiratory failure, surgical resection or stent placement is the most prudent treatment. In less urgent conditions, BBD has been considered a simple, rapid, and safe method to restore airway caliber. BBD has been used alone or in combination with other modalities such as laser resection, cryotherapy, and electrocautery. In 1984, Cohen et al. (Cohen et al., 1984) reported a successful balloon dilation through a tracheostomy tube under propylidone injection for a stricture after segmental resection of congenital stenosis in an infant. In 1987, Fowler et al. (Fowler et al., 1987) described bronchoscopic balloon dilation using a rigid bronchoscope for anastomotic stenosis in an adult who had had a sleeve resection for an endobronchial squamous cell carcinoma of the right main-stem bronchus 2 years earlier. The following year Carlin et al. (Carlin et al., 1988) reported two cases of bronchial stenosis successfully treated with a combination of bronchoscopic balloon dilation and Nd-YAG laser photoresection with a rigid bronchoscope. In 1991, balloon dilation using flexible bronchoscopy was described for the first time by Nakamura et al. (Nakamura et al., 1991). They treated two patients with tuberculous bronchial stenosis through a flexible bronchoscope under local anesthesia. Since then, several reports of BBD have been published (Ball et al., 1991; Keller &

**1. Introduction** 

Masayuki Tanahashi, Hiroshi Niwa, Haruhiro Yukiue,

*Division of Thoracic Surgery, Respiratory Disease Center,* 

*Seirei Mikatahara General Hospital* 


### **Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis**

Masayuki Tanahashi, Hiroshi Niwa, Haruhiro Yukiue, Eriko Suzuki, Hiroshi Haneda, Naoko Yoshii and Hisanori Kani *Division of Thoracic Surgery, Respiratory Disease Center, Seirei Mikatahara General Hospital Japan* 

#### **1. Introduction**

134 Global Perspectives on Bronchoscopy

[14] Orozco-Díaz E, Álvares-Ríos JJ, Arceo-Díaz JL. Ornelas-Aguirre JM. Predictive factors of difficult airway with known assessment scales. Cir Cir 2010;78:393-399. [15] Serocki G, Bein B, Scholz J, Dörges V. Management of the predicted difficult airway: a

[16] van Zwan JP, Kapteijns EFG, Lahey S, Smit HJM. Flexible bronchoscopy in supine or

[17] Stubb SE, McDougall. Preparation of the patient for bronchoscopy. In Bronchoscpy. Ed.

[18] Heir JS, Kupferman ME. A simple approach to facilitating fiberoptic intubation in the

[19] Fragoso Guerreiro da Cunhna E, Rosal Gonçalves JM. Role of fiber optic bronchoscopy

[20] Reynolds SF, Heffner J. Airway management of the critically ill patient. Chest

[21] Cook TM, Woodall N, Benjer J. Major complications of airway management in the UK.

[22] Tai DYH. Bronchoscopy in the intensive care unit. Ann Acad Med 1998;27:552-558. [23] Phua GC, Wahif MM. ICU procedures in the critically ill. Respirology 2009;14:1092-

laryngosopy and the GlideScope. Eur J Anaesthesiol 2010;27:24-30.

Bronchol Intervent Pulmonol 2010;17:29-32.

69.

1097.

2005;127:1397-1412.

UBS Prakash. New York. Raven Press; 1995. p. 109.

difficult airway. Laryngoscope 2011;121:310-312.

departments. Br J Anaesth 2011;106:632-642.

comparison of conventional blade laryngoscopy with video-assisted blade

sitting position. A randomized prospective analysis of safety and patient comfort. J

in intensive care unit: current practice. J Bronchol Intervent Pulmonol 2011;18:68-

Results of the Fourth National Audit Project of the Royal College of Anaesthetist and the Difficult Airway Society. Part 2: Intensive care and emergency Bronchoscopic balloon dilation (BBD) is a useful method of treating tracheobronchial stenosis. Tracheobronchial stenosis in adults can arise from benign or malignant disease. Benign stenosis causes include sarcoidosis, tuberculosis, Wegener's granulomatosis, trauma, berylliosis, and foreign body reaction. Furthermore, it can arise after prolonged endotracheal intubation, after sleeve resection or after lung transplantation. Despite adequate systemic therapy, airway stenosis may progress due to tuberculosis or sarcoidosis. In infants, prior use of endobronchial and tracheostomy tubes or congenital stenosis from complete cartilaginous rings are the primary reasons for such stenosis (McDonald & Stocks, 1965; Parkin ea al., 1976). Subglottic or tracheal sites are thus common and may continue to present serious and often fatal respiratory problems in infants. In adults, the etiologies are variable and the stricture can happen in any part of the airway. Tracheobronchial stenosis may produce symptoms such as dyspnea, cough, wheeze, stridor, or recurrent lower respiratory tract infections, and these symptoms cause the airway stricture to mimic asthma. There are various treatments including surgical resection, laser resection, and bougie dilation during rigid bronchoscopy. For lesions causing impending respiratory failure, surgical resection or stent placement is the most prudent treatment. In less urgent conditions, BBD has been considered a simple, rapid, and safe method to restore airway caliber. BBD has been used alone or in combination with other modalities such as laser resection, cryotherapy, and electrocautery. In 1984, Cohen et al. (Cohen et al., 1984) reported a successful balloon dilation through a tracheostomy tube under propylidone injection for a stricture after segmental resection of congenital stenosis in an infant. In 1987, Fowler et al. (Fowler et al., 1987) described bronchoscopic balloon dilation using a rigid bronchoscope for anastomotic stenosis in an adult who had had a sleeve resection for an endobronchial squamous cell carcinoma of the right main-stem bronchus 2 years earlier. The following year Carlin et al. (Carlin et al., 1988) reported two cases of bronchial stenosis successfully treated with a combination of bronchoscopic balloon dilation and Nd-YAG laser photoresection with a rigid bronchoscope. In 1991, balloon dilation using flexible bronchoscopy was described for the first time by Nakamura et al. (Nakamura et al., 1991). They treated two patients with tuberculous bronchial stenosis through a flexible bronchoscope under local anesthesia. Since then, several reports of BBD have been published (Ball et al., 1991; Keller &

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 137

After local or general anesthesia, bronchoscopy is first performed with a diagnostic bronchoscope (BF-260; Olympus, Tokyo) or a therapeutic bronchoscope (BF-1T60; Olympus, Tokyo) to assess and localize the airway stenosis before balloon dilation. Bronchoscopy provides information about not only the localization and extent of the stenosis but also the condition of the mucosa and influence of extra-bronchial lesions. Radiopaque markers are placed on the surface of the skin to identify the proximal and distal limits of the stenosis. A flexible, 0.035-inch guidewire (JagwireTM Plus; Boston Scientific/Medi-tech, Natick, MA) is then inserted through the working channel of the bronchoscope and is passed through the stenosis (Fig. 1a). This is performed under fluoroscopy to ensure that the guidewire does not extend to the pleura. With the guidewire held in place, the bronchoscope is withdrawn. The placement of the guidewire should be confirmed with fluoroscopy after the bronchoscope has been removed. Next, a balloon catheter (CRETM Fixed Wire & Wire Guided Balloon Dilators, HurricaneTM RX Biliary Balloon Dilation Catheter, Max ForceTM TTS; Boston Scientific/Medi-tech, Natick, MA) is selected, based on balloon length and diameter in relation to the stenosis dimensions. These balloon catheters are made of polyamide and have radiopaque markers at the proximal and distal ends of the balloon. They are available in variety of size ranges. The balloon is constructed of such material that the nominal diameter of the balloon is proportional to the inflation pressure (3-12 atm). The balloon is inflated based on that particular balloon catheter's characteristics. The diameter of the balloon is chosen to be the same diameter as that of the lumen measured at the proximal region of the normal airway. The length of the balloon is at least 0.5cm greater than that of stenotic segment, since the entire stenosis will be dilated when the balloon is inflated. If the inflated balloon length is insufficient, the balloon can slip out of the stenosis. If the balloon length is too great, there is a potential for airway damage. This diameter and length of the balloon are measured by both bronchoscope and chest CT scans. The required width can be estimated from a comparison of the bronchoscope diameter to that of the stenosis. The required length of balloon is estimated by passing the bronchoscope through the stenosis and by measuring the distance between the proximal and distal limits of the obstruction. Three-dimensional CT is a useful noninvasive evaluation for BBD (Rooney et al., 2005). It allows for preoperative determination of balloon size and length, even if the bronchoscope cannot be passed through the obstruction. It can allow an accurate determination of the degree and length of stenosis, an evaluation of the airway distal to the stenosis and show the presence of multiple stenoses as well as the relationships with mediastinal structures. Furthermore, it is a useful noninvasive technique for postoperative follow-up. It can not only evaluate the effect of BBD, but also detect complications related to BBD such as a deep laceration, pneumomediastinum or mediastinal bleeding (Y. H. Kim et al., 2006). When the stenosis is too narrow for a balloon catheter, a smaller balloon catheter is used first to create a passage for the larger balloon catheter and a wider and longer balloon may be used by exchanging the balloon catheter for another over the guidewire. Under fluoroscopic guidance, an appropriately sized balloon catheter is then advanced over the guidewire and positioned such that the balloon markers are properly located with respect to the stenosis (Fig. 1b). The bronchoscope is again inserted to visualize the stenosis and the balloon catheter (Fig. 1c). The balloon is then inflated with a dilute nonionic contrast medium (Iopamidol; Bracco, Milan), and the results are observed via both fluoroscopy and bronchoscopy (Fig. 1d). The inflation time is between approximately 30 seconds and 2 minutes, depending on the clinical tolerance and consequences on cutaneous oxygen saturation. Occasionally the initial inflation times must be very short, but they can be increased as dilation proceeds. Nonionic

Frost, 1992; Carre et al., 1994; Fouty et al., 1994; Ferretti et al., 1995; Sheski & Mathur, 1998). The major advantages of BBD are lower morbidity and mortality than surgery, stent placement, or bougienage. BBD has thus become an accepted treatment for benign tracheobronchial stenosis.

#### **2. Indications and contraindications**

Balloon dilation has an indication in almost all benign tracheobronchial strictures. The bronchial stenosis caused by tuberculosis finally heals with fibrous scarring through a submucosal infiltration by tubercles and lymphocytes, followed by ulceration and growth of granulation tissue (Bugher et al., 1937; Wilson, 1945; Auerbach, 1949; Judd, 1947). Stenosis from other medical causes such as Wegener's granulomatosis, sarcoidosis (Fouty et al., 1994; Olsson et al., 1979), berylliosis, post-tracheostomy, and complicated tracheobronchial anastomosis may also ultimately result in fibrous scars. Such fibrotic stenosis is a good indication for BBD. Visual characteristics such as pale or nonedematous mucosa may suggest a lesion with little inflammation and a greater likelihood of successful opening (Ferretti et al., 1995; Brown et al., 1987). In particular, inoperable long segmental stenosis is well treated by BBD. On the other hand, if the bronchial cartilage is destroyed, the success rate of BBD is low (Carre et al., 1994). An airway stricture with tracheobronchomalacia usually requires combination therapy with another therapeutic modality such as stent placement to maintain airway patency. Iwamoto et al. (Iwamoto et al., 2004) reported that endobronchial ultrasonography (EBUS) imaging was useful in making a diagnosis of cartilaginous tracheobronchomalacia and in aiding the decision as to whether or not a stent was needed. In lung transplantation, this endobronchial stenosis may be a result of airway rejection or due to ischemic changes at the site of the bronchial implantation. When there must be an ongoing process such as airway rejection or ischemia, even if repeated BBD is performed, endobronchial stenosis is often recurrent. In malignancy, balloon dilation is performed in combination with other modalities such as laser resection, stent placement, cryotherapy, and electrocautery (Hautmann et al., 2001). Assessment of the patient's coagulation status before the procedure is important because bleeding is a frequent complication of BBD. The decision to continue or withhold anticoagulant or antiplatelet drugs should reflect a balance of the consequences of periprocedural hemorrhage versus the risk of periprocedural vascular complications. Aspirin, NSAIDs, ibuprofen, clopidigrel, and warfarin should be discontinued at least 7-10 days, 3 days, 24 hours, 7-10 days, and 3-5 days before BBD, respectively (Douketis et al., 2008; Kearon et al., 1997; Larson et al., 2005). Nonacetylated NSAIDs can be continued in the periprocedual period. If the patient cannot stop taking any anticoagulant or antiplatelet medication, BBD should be performed prudently.

#### **3. Technique**

BBD is generally performed under topical anesthesia and conscious sedation, but BBD for tracheal stenosis will be performed better under general anesthesia with laryngeal mask ventilation or tracheal intubation, because long-term respiratory arrest is needed during inflation and this would cause great anxiety to the patient. Patients are maintained with 100% oxygen during the procedure and are hyperventilated immediately before balloon inflation.

Frost, 1992; Carre et al., 1994; Fouty et al., 1994; Ferretti et al., 1995; Sheski & Mathur, 1998). The major advantages of BBD are lower morbidity and mortality than surgery, stent placement, or bougienage. BBD has thus become an accepted treatment for benign

Balloon dilation has an indication in almost all benign tracheobronchial strictures. The bronchial stenosis caused by tuberculosis finally heals with fibrous scarring through a submucosal infiltration by tubercles and lymphocytes, followed by ulceration and growth of granulation tissue (Bugher et al., 1937; Wilson, 1945; Auerbach, 1949; Judd, 1947). Stenosis from other medical causes such as Wegener's granulomatosis, sarcoidosis (Fouty et al., 1994; Olsson et al., 1979), berylliosis, post-tracheostomy, and complicated tracheobronchial anastomosis may also ultimately result in fibrous scars. Such fibrotic stenosis is a good indication for BBD. Visual characteristics such as pale or nonedematous mucosa may suggest a lesion with little inflammation and a greater likelihood of successful opening (Ferretti et al., 1995; Brown et al., 1987). In particular, inoperable long segmental stenosis is well treated by BBD. On the other hand, if the bronchial cartilage is destroyed, the success rate of BBD is low (Carre et al., 1994). An airway stricture with tracheobronchomalacia usually requires combination therapy with another therapeutic modality such as stent placement to maintain airway patency. Iwamoto et al. (Iwamoto et al., 2004) reported that endobronchial ultrasonography (EBUS) imaging was useful in making a diagnosis of cartilaginous tracheobronchomalacia and in aiding the decision as to whether or not a stent was needed. In lung transplantation, this endobronchial stenosis may be a result of airway rejection or due to ischemic changes at the site of the bronchial implantation. When there must be an ongoing process such as airway rejection or ischemia, even if repeated BBD is performed, endobronchial stenosis is often recurrent. In malignancy, balloon dilation is performed in combination with other modalities such as laser resection, stent placement, cryotherapy, and electrocautery (Hautmann et al., 2001). Assessment of the patient's coagulation status before the procedure is important because bleeding is a frequent complication of BBD. The decision to continue or withhold anticoagulant or antiplatelet drugs should reflect a balance of the consequences of periprocedural hemorrhage versus the risk of periprocedural vascular complications. Aspirin, NSAIDs, ibuprofen, clopidigrel, and warfarin should be discontinued at least 7-10 days, 3 days, 24 hours, 7-10 days, and 3-5 days before BBD, respectively (Douketis et al., 2008; Kearon et al., 1997; Larson et al., 2005). Nonacetylated NSAIDs can be continued in the periprocedual period. If the patient cannot stop taking any anticoagulant or antiplatelet medication, BBD should be performed

BBD is generally performed under topical anesthesia and conscious sedation, but BBD for tracheal stenosis will be performed better under general anesthesia with laryngeal mask ventilation or tracheal intubation, because long-term respiratory arrest is needed during inflation and this would cause great anxiety to the patient. Patients are maintained with 100% oxygen during the procedure and are hyperventilated immediately before balloon

tracheobronchial stenosis.

prudently.

inflation.

**3. Technique** 

**2. Indications and contraindications** 

After local or general anesthesia, bronchoscopy is first performed with a diagnostic bronchoscope (BF-260; Olympus, Tokyo) or a therapeutic bronchoscope (BF-1T60; Olympus, Tokyo) to assess and localize the airway stenosis before balloon dilation. Bronchoscopy provides information about not only the localization and extent of the stenosis but also the condition of the mucosa and influence of extra-bronchial lesions. Radiopaque markers are placed on the surface of the skin to identify the proximal and distal limits of the stenosis. A flexible, 0.035-inch guidewire (JagwireTM Plus; Boston Scientific/Medi-tech, Natick, MA) is then inserted through the working channel of the bronchoscope and is passed through the stenosis (Fig. 1a). This is performed under fluoroscopy to ensure that the guidewire does not extend to the pleura. With the guidewire held in place, the bronchoscope is withdrawn. The placement of the guidewire should be confirmed with fluoroscopy after the bronchoscope has been removed. Next, a balloon catheter (CRETM Fixed Wire & Wire Guided Balloon Dilators, HurricaneTM RX Biliary Balloon Dilation Catheter, Max ForceTM TTS; Boston Scientific/Medi-tech, Natick, MA) is selected, based on balloon length and diameter in relation to the stenosis dimensions. These balloon catheters are made of polyamide and have radiopaque markers at the proximal and distal ends of the balloon. They are available in variety of size ranges. The balloon is constructed of such material that the nominal diameter of the balloon is proportional to the inflation pressure (3-12 atm). The balloon is inflated based on that particular balloon catheter's characteristics. The diameter of the balloon is chosen to be the same diameter as that of the lumen measured at the proximal region of the normal airway. The length of the balloon is at least 0.5cm greater than that of stenotic segment, since the entire stenosis will be dilated when the balloon is inflated. If the inflated balloon length is insufficient, the balloon can slip out of the stenosis. If the balloon length is too great, there is a potential for airway damage. This diameter and length of the balloon are measured by both bronchoscope and chest CT scans. The required width can be estimated from a comparison of the bronchoscope diameter to that of the stenosis. The required length of balloon is estimated by passing the bronchoscope through the stenosis and by measuring the distance between the proximal and distal limits of the obstruction. Three-dimensional CT is a useful noninvasive evaluation for BBD (Rooney et al., 2005). It allows for preoperative determination of balloon size and length, even if the bronchoscope cannot be passed through the obstruction. It can allow an accurate determination of the degree and length of stenosis, an evaluation of the airway distal to the stenosis and show the presence of multiple stenoses as well as the relationships with mediastinal structures. Furthermore, it is a useful noninvasive technique for postoperative follow-up. It can not only evaluate the effect of BBD, but also detect complications related to BBD such as a deep laceration, pneumomediastinum or mediastinal bleeding (Y. H. Kim et al., 2006). When the stenosis is too narrow for a balloon catheter, a smaller balloon catheter is used first to create a passage for the larger balloon catheter and a wider and longer balloon may be used by exchanging the balloon catheter for another over the guidewire. Under fluoroscopic guidance, an appropriately sized balloon catheter is then advanced over the guidewire and positioned such that the balloon markers are properly located with respect to the stenosis (Fig. 1b). The bronchoscope is again inserted to visualize the stenosis and the balloon catheter (Fig. 1c). The balloon is then inflated with a dilute nonionic contrast medium (Iopamidol; Bracco, Milan), and the results are observed via both fluoroscopy and bronchoscopy (Fig. 1d). The inflation time is between approximately 30 seconds and 2 minutes, depending on the clinical tolerance and consequences on cutaneous oxygen saturation. Occasionally the initial inflation times must be very short, but they can be increased as dilation proceeds. Nonionic

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 139

 (a) (b) Fig. 2. a) If the diameter of the deflated catheter is less than that of the working channel, the bronchoscope need not be removed before the balloon catheter is inserted. A balloon catheter is passed over the guidewire through the working channel and positioned within the narrowed segment of the airway under bronchoscopic visualization. b) The balloon is inflated and deflated, and the results are observed via both bronchoscopy and fluoroscopy.

underwent BBD usually discharges the next day of the procedure. If a complication such as laceration occurs, the patient needs to be hospitalized for several days to monitor his conditions. Follow-up bronchoscopy is performed about 2-4 weeks after dilation. If the desired airway diameter is not attained or recurrent stenosis is observed, the balloon

During BBD, chest pain, bronchospasm and atelectasis have been reported (Brown et al., 1987; Elkerbout et al., 1993; Hebra et al., 1991). Excessive balloon inflation may lacerate or rupture the airway, causing bleeding, pneumothorax, pneumomediastinum, or mediastinitis. As far as we know, there are few reports describing lacerations of the tracheobronchial tree after balloon dilation. One case of rupture requiring surgical management has been reported (Knott et al., 2004). However, other lacerations except for this one healed spontaneously and there were no clinical problems (Y. H. Kim et al., 2006; J. H. Kim et al., 2007; K. H. Lee et al., 2002). No patients have died during or from problems

Several reports of BBD in adults are available. Technical success is defined by successful passing of a balloon catheter through a stenosis. Short-term clinical success is defined as the loss of the typical waist made in the wall of the balloon by the stenosis by fluoroscopy, an increase in tracheobronchial diameter of the stenotic segment immediately after bronchoscopy, and improvement of the patient's clinical symptoms. Long-term success is based on the patient remaining asymptomatic. Recurrence is defined as the return of symptoms. Some patients have undergone radiographic evaluation with chest roentgenography or CT scan, pulmonary function testing, or bronchoscopy as part of follow-up care. The short-term results of balloon dilation to treat benign tracheobronchial stenosis have been favorable. Clinical success rates of 63% to 100% have been reported

dilation is repeated until the desired effect is obtained.

**4. Complications** 

related to BBD.

**5. Results** 

Fig. 1. a) A guidewire is passed beyond the stenosis, using bronchoscopy and fluoroscopy to ensure that the guidewire does not extend to the pleura and then the bronchoscope is withdrawn, leaving the guidewire in place. b) The balloon catheter is advanced over a guidewire and positioned under fluoroscopy. c) Proper positioning of the proximal end of the balloon is confirmed with visualization through the bronchoscope. d) Bronchoscopy allows direct monitoring of balloon inflation and deflation with fluoroscopy.

contrast media are safe for the bronchus because bronchography using nonionic contrast media instead of propylidone is performed safely (Morcos et al., 1989, 1990; Riebel & Wartner, 1990).

If the diameter of the deflated catheter is less than that of the working channel, a bronchoscope is not needed to remove before the balloon catheter is inserted. A balloon catheter is passed over the guidewire through the working channel and positioned within the narrowed segment of the airway under bronchoscopic visualization (Fig. 2a, Fig. 2b).

During inflation, a balloon inflation device with pressure-gauge monitor (AllianceTM Inflation Device; Boston Scientific/Medi-tech, Natick, MA) is used to inflate the balloon and to monitor the inflation pressure. Success is defined as loss of the typical waist made in the wall of the balloon by the stenosis as observed by fluoroscopy and a stable increase in tracheobronchial diameter of the stenotic segment by bronchoscopy. If necessary, the balloon catheter then can be repositioned or replaced by a larger sized balloon catheter, and the procedure repeated until the desired effect is obtained. Adjunctive treatments such as laser vaporization or stent placement may precede or follow balloon dilation. Patient who

Fig. 2. a) If the diameter of the deflated catheter is less than that of the working channel, the bronchoscope need not be removed before the balloon catheter is inserted. A balloon catheter is passed over the guidewire through the working channel and positioned within the narrowed segment of the airway under bronchoscopic visualization. b) The balloon is inflated and deflated, and the results are observed via both bronchoscopy and fluoroscopy.

underwent BBD usually discharges the next day of the procedure. If a complication such as laceration occurs, the patient needs to be hospitalized for several days to monitor his conditions. Follow-up bronchoscopy is performed about 2-4 weeks after dilation. If the desired airway diameter is not attained or recurrent stenosis is observed, the balloon dilation is repeated until the desired effect is obtained.

#### **4. Complications**

138 Global Perspectives on Bronchoscopy

allows direct monitoring of balloon inflation and deflation with fluoroscopy.

Wartner, 1990).

(c) (d) Fig. 1. a) A guidewire is passed beyond the stenosis, using bronchoscopy and fluoroscopy to ensure that the guidewire does not extend to the pleura and then the bronchoscope is withdrawn, leaving the guidewire in place. b) The balloon catheter is advanced over a guidewire and positioned under fluoroscopy. c) Proper positioning of the proximal end of the balloon is confirmed with visualization through the bronchoscope. d) Bronchoscopy

contrast media are safe for the bronchus because bronchography using nonionic contrast media instead of propylidone is performed safely (Morcos et al., 1989, 1990; Riebel &

If the diameter of the deflated catheter is less than that of the working channel, a bronchoscope is not needed to remove before the balloon catheter is inserted. A balloon catheter is passed over the guidewire through the working channel and positioned within the narrowed segment of the airway under bronchoscopic visualization (Fig. 2a, Fig. 2b).

During inflation, a balloon inflation device with pressure-gauge monitor (AllianceTM Inflation Device; Boston Scientific/Medi-tech, Natick, MA) is used to inflate the balloon and to monitor the inflation pressure. Success is defined as loss of the typical waist made in the wall of the balloon by the stenosis as observed by fluoroscopy and a stable increase in tracheobronchial diameter of the stenotic segment by bronchoscopy. If necessary, the balloon catheter then can be repositioned or replaced by a larger sized balloon catheter, and the procedure repeated until the desired effect is obtained. Adjunctive treatments such as laser vaporization or stent placement may precede or follow balloon dilation. Patient who

(a) (b)

During BBD, chest pain, bronchospasm and atelectasis have been reported (Brown et al., 1987; Elkerbout et al., 1993; Hebra et al., 1991). Excessive balloon inflation may lacerate or rupture the airway, causing bleeding, pneumothorax, pneumomediastinum, or mediastinitis. As far as we know, there are few reports describing lacerations of the tracheobronchial tree after balloon dilation. One case of rupture requiring surgical management has been reported (Knott et al., 2004). However, other lacerations except for this one healed spontaneously and there were no clinical problems (Y. H. Kim et al., 2006; J. H. Kim et al., 2007; K. H. Lee et al., 2002). No patients have died during or from problems related to BBD.

#### **5. Results**

Several reports of BBD in adults are available. Technical success is defined by successful passing of a balloon catheter through a stenosis. Short-term clinical success is defined as the loss of the typical waist made in the wall of the balloon by the stenosis by fluoroscopy, an increase in tracheobronchial diameter of the stenotic segment immediately after bronchoscopy, and improvement of the patient's clinical symptoms. Long-term success is based on the patient remaining asymptomatic. Recurrence is defined as the return of symptoms. Some patients have undergone radiographic evaluation with chest roentgenography or CT scan, pulmonary function testing, or bronchoscopy as part of follow-up care. The short-term results of balloon dilation to treat benign tracheobronchial stenosis have been favorable. Clinical success rates of 63% to 100% have been reported

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 141

Patient Age Sex C.C. Etiology Area Length Severity 1 42 F DOE Tb Tr 4cm 70% 2 60 F DOE Tb Tr 3cm 70% 3 30 M # Tracheostomy Tr 6cm 70% 4 33 F Cough, Sputum Tb Lt-MB 2cm Pinhole 5 19 M DOE Tb Lt-MB 2cm Pinhole

6 38 M DOE Bronchoplasty Rt-MB 1cm Pinhole

8 30 M Cough, Stridor Tb Lt-MB 5cm 70%

1 G 18×55 3 None 3 mos good 2 G 12~15×55 3 Laceration 4 mos good 3 G 18 × 80 2~4 Laceration Fair 4 L 10 × 40 4 None 3 yrs good

6 L 10×20 6 None 3 yrs good

Anes.=anesthesia, G=general anesthesia, L=local anesthesia, d=diameter, l=length, atm=atmosphere,

dilation and an increase of FEV1 or FVC of more than 15% after BBD was obtained in five of 13 patients after 1 or 2 days and that eight of the 13 patients (62%) showed improvement of FEV1 or FVC after 1 year. Hautmann et al. (Hautmann et al., 2001) reported that lung function analysis demonstrated a small but significant increase in FEV1, peak expiratory flow rate (PEFR), FEV1/FVC, and PaO2 within 72 hours after BBD in 42 patients with malignant tracheobronchial disease. In our study, the improvements in symptoms such as dyspnea, cough, and stridor following dilation were dramatic in most patients. Patients' respiratory status was evaluated before and after BBD by means of pulmonary function test and Hugh-Jones classification (Table 3). All patients showed improvements of FEV1, peak expiratory flow (PEF) and Hugh-Jones classification (Fig. 13). Thus, BBD is useful not only for increasing the tracheobronchial diameter of the stenotic segment but also for improving

L 10×40, 12×55 3~4 None 3 yrs good L 10×20 3~4 None 3 yrs good

G 8~18×80 3~8 Laceration 4 yrs good G 8~12×55 3~8 Laceration 4 yrs good

G 6~10×55 3~10 Laceration 2 yrs good G 4~6×20 7~12 None 2 yrs good

Complications Patency (d×l, mm) (atm)

C.C=Chief complaint, DOE=Dyspnea on excertion, #=Difficulty in removing tracheostomy tube, Tb=Tuberculosis, Tr=Trachea, Lt-MB left main bronchus, Lt-UB=left upper bronchus, Rt-MB=right

Balloon Catheter Pressure

7 48 F DOE Tb

Table 1. Patients underwent bronchoscopic balloon dilation

main bronchus, Lt-LB=left lower bronchus

BBDs=balloon dilations, mos=months, yrs=years

respiratory function and symptoms.

Table 2. Details and results of bronchoscopic balloon dilation

Patient Anes.

5

7

8

Lt-UB 0. 5cm Pinhole

Tr 6cm 80% Rt-MB 2cm pinhole

Lt-LB 1cm Pinhole

(Carre et al., 1994; Ferretti et al., 1995; Sheski & Mathur, 1998; J. H. Kim et al., 2007; K. W. Lee et al., 1999; Mayse et al., 2004). However, the long-term efficacy of balloon dilation in a large group of patients has rarely been reported. According to the reports, recurrence rates range from 30% to 80% (Carre et al., 1994; Ferretti et al., 1995; Iwamoto et al., 2004; J. H. Kim et al., 2007; K. H. Lee et al., 2002; K. W. Lee et al., 1999).

Kim et al. (J. H. Kim et al., 2007) reported that a group of patients with tracheobronchial lacerations (n=64) showed better cumulative airway patency than a group without tracheobronchial lacerations (n=60) (medium patency duration, 24 vs. 4 months, respectively). They concluded that better clinical outcomes might occur following superficial or deep lacerations after BBD in patients with a benign tracheobronchial stricture. Lee et al. (K. H. Lee et al., 2002) reported that initial symptomatic improvement after BBD was achieved in 83% (49/59) of patients, however, during a mean of 32 months follow-up the recurrence rate of BBD was high (80%, 39/49). They also reported that the secondary patency rate with repeat balloon dilation at 32 months was 43%, a relatively acceptable longterm result. Lee et al. (K. W. Lee et al., 1999) reported that improvements in dyspnea after BBD for tuberculous bronchial stenosis occurred immediately in 73% (11/15), 73% after 1 month, 73% after 6 months, 64% after 1 year, 64% after 3 years, and 42% after 6 years. They concluded that the long-term results of BBD were acceptable.

We performed BBD in eleven sessions for benign tracheobronchial stenoses in 8 patients between December 1987 and March 2009. The patients were four males and four females, and ranged in age from 30 to 60 years. The indications were tuberculous stenosis (n=6), post-tracheostomy stricture (n=1) and post-bronchoplasty anastmous stenosis (n=1). The sites of stenosis were the trachea (n=4), left main bronchus (n=3), right main bronchus (n=2), left upper bronchus (n=1), and left lower bronchus (n=1). Stenoses ranged in diameter from pinhole (more than 90%) to 70%, and in length from 0.5 to 6 cm. They were followed up for 3-48 months (mean follow-up 26.7 months) with radiographic evaluation by chest roentgenography or CT scan, pulmonary function testing, or bronchoscopy after BBD. BBD was performed under local anesthesia in 3 patients and general anesthesia in 5 patients. For tracheal stenosis, 8-18 mm diameter balloons (55-80 mm long) were used. For bronchial stenosis, 4-12 mm diameter balloons (20-55 mm long) were used. The results in seven of eight treated patients were successful in maintaining airway patency. The only one unsuccessful patient was one of post-tracheostomy stenosis resulting in secondary tracheomalacia, and this patient needed T-tube stent placement to support the weakened cartilage and prevent dynamic airway collapse. As regards complications, there were four patients with longitudinal tracheal or bronchial lacerations, but all lacerations healed spontaneously after conservative treatment. Thus, a laceration should be regarded as an expected result of sufficient balloon dilation, not as a major complication. There were no recurrences during 3-48 months follow up period in our study. Tables 1 and 2 summarize our experience. Figures 3 to 12 show the patients with tracheobronchial stenosis who underwent BBD.

Respiratory functional improvement can be obtained after BBD, as well as improved tracheobronchial diameter. Lee et al. (K. H. Lee et al., 2002) reported significant improvements in the mean forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and forced expiratory flow 25%-75% after technically and clinically successful balloon dilation in 49 patients. Lee et al. (K. W. Lee et al., 1999) reported that improvement of dyspnea occurred immediately in 11 of 15 patients (73%) after balloon

(Carre et al., 1994; Ferretti et al., 1995; Sheski & Mathur, 1998; J. H. Kim et al., 2007; K. W. Lee et al., 1999; Mayse et al., 2004). However, the long-term efficacy of balloon dilation in a large group of patients has rarely been reported. According to the reports, recurrence rates range from 30% to 80% (Carre et al., 1994; Ferretti et al., 1995; Iwamoto et al., 2004; J. H. Kim et al.,

Kim et al. (J. H. Kim et al., 2007) reported that a group of patients with tracheobronchial lacerations (n=64) showed better cumulative airway patency than a group without tracheobronchial lacerations (n=60) (medium patency duration, 24 vs. 4 months, respectively). They concluded that better clinical outcomes might occur following superficial or deep lacerations after BBD in patients with a benign tracheobronchial stricture. Lee et al. (K. H. Lee et al., 2002) reported that initial symptomatic improvement after BBD was achieved in 83% (49/59) of patients, however, during a mean of 32 months follow-up the recurrence rate of BBD was high (80%, 39/49). They also reported that the secondary patency rate with repeat balloon dilation at 32 months was 43%, a relatively acceptable longterm result. Lee et al. (K. W. Lee et al., 1999) reported that improvements in dyspnea after BBD for tuberculous bronchial stenosis occurred immediately in 73% (11/15), 73% after 1 month, 73% after 6 months, 64% after 1 year, 64% after 3 years, and 42% after 6 years. They

We performed BBD in eleven sessions for benign tracheobronchial stenoses in 8 patients between December 1987 and March 2009. The patients were four males and four females, and ranged in age from 30 to 60 years. The indications were tuberculous stenosis (n=6), post-tracheostomy stricture (n=1) and post-bronchoplasty anastmous stenosis (n=1). The sites of stenosis were the trachea (n=4), left main bronchus (n=3), right main bronchus (n=2), left upper bronchus (n=1), and left lower bronchus (n=1). Stenoses ranged in diameter from pinhole (more than 90%) to 70%, and in length from 0.5 to 6 cm. They were followed up for 3-48 months (mean follow-up 26.7 months) with radiographic evaluation by chest roentgenography or CT scan, pulmonary function testing, or bronchoscopy after BBD. BBD was performed under local anesthesia in 3 patients and general anesthesia in 5 patients. For tracheal stenosis, 8-18 mm diameter balloons (55-80 mm long) were used. For bronchial stenosis, 4-12 mm diameter balloons (20-55 mm long) were used. The results in seven of eight treated patients were successful in maintaining airway patency. The only one unsuccessful patient was one of post-tracheostomy stenosis resulting in secondary tracheomalacia, and this patient needed T-tube stent placement to support the weakened cartilage and prevent dynamic airway collapse. As regards complications, there were four patients with longitudinal tracheal or bronchial lacerations, but all lacerations healed spontaneously after conservative treatment. Thus, a laceration should be regarded as an expected result of sufficient balloon dilation, not as a major complication. There were no recurrences during 3-48 months follow up period in our study. Tables 1 and 2 summarize our experience. Figures 3 to 12 show the patients with tracheobronchial stenosis who

Respiratory functional improvement can be obtained after BBD, as well as improved tracheobronchial diameter. Lee et al. (K. H. Lee et al., 2002) reported significant improvements in the mean forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and forced expiratory flow 25%-75% after technically and clinically successful balloon dilation in 49 patients. Lee et al. (K. W. Lee et al., 1999) reported that improvement of dyspnea occurred immediately in 11 of 15 patients (73%) after balloon

2007; K. H. Lee et al., 2002; K. W. Lee et al., 1999).

concluded that the long-term results of BBD were acceptable.

underwent BBD.


C.C=Chief complaint, DOE=Dyspnea on excertion, #=Difficulty in removing tracheostomy tube, Tb=Tuberculosis, Tr=Trachea, Lt-MB left main bronchus, Lt-UB=left upper bronchus, Rt-MB=right main bronchus, Lt-LB=left lower bronchus


Table 1. Patients underwent bronchoscopic balloon dilation

Anes.=anesthesia, G=general anesthesia, L=local anesthesia, d=diameter, l=length, atm=atmosphere, BBDs=balloon dilations, mos=months, yrs=years

Table 2. Details and results of bronchoscopic balloon dilation

dilation and an increase of FEV1 or FVC of more than 15% after BBD was obtained in five of 13 patients after 1 or 2 days and that eight of the 13 patients (62%) showed improvement of FEV1 or FVC after 1 year. Hautmann et al. (Hautmann et al., 2001) reported that lung function analysis demonstrated a small but significant increase in FEV1, peak expiratory flow rate (PEFR), FEV1/FVC, and PaO2 within 72 hours after BBD in 42 patients with malignant tracheobronchial disease. In our study, the improvements in symptoms such as dyspnea, cough, and stridor following dilation were dramatic in most patients. Patients' respiratory status was evaluated before and after BBD by means of pulmonary function test and Hugh-Jones classification (Table 3). All patients showed improvements of FEV1, peak expiratory flow (PEF) and Hugh-Jones classification (Fig. 13). Thus, BBD is useful not only for increasing the tracheobronchial diameter of the stenotic segment but also for improving respiratory function and symptoms.

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 143

Fig. 5. Tuberculous tracheal and right main bronchial stenosis of a 48-year-old female (patient 7). She had progressive severe dyspnea at rest with continuous coughing and stridor. Three-dimensional reconstruction CT shows 60mm segment of 8mm diameter

(a) (b) (c)

Fig. 6. a) Pre-balloon dilation bronchoscopic view of patient 7 shows severe long segmental stenosis at the trachea. b) Immediately after balloon dilation, a deep laceration is observed from the trachea to the right main bronchus at the membrane portion, but the patient is stable and asymptomatic. c) Two months later, the laceration is spontaneously healed and the airway is markedly wider than before dilation. Following the balloon dilation the patient is less dyspnetic at rest and can perform housework without becoming short of breath.

severe narrowing from upper trachea to right main bronchus.

Fig. 3. Tuberculous bronchial stenosis of a 19-year-old man (patient 5). a) Pre-balloon dilation bronchoscopic view shows severe stenosis at the left main bronchus. The orifice is almost obstructed. b) Bronchoscopy three years after balloon dilation shows an almost normal airway. His symptoms immediately improved and he has done well.

(a) (b)

(a) (b)

Fig. 4. Post-bronchoplastic stenosis of a 38-year-old man (patient 6). a) Pre-balloon dilation bronchoscopic view shows pinhole size opening of the right main bronchus. b) At follow up bronchoscopy 3 years after BBD an almost normal lumen of the right main bronchus is maintained. He is doing well without evident respiratory symptoms.

(a) (b)

(a) (b)

maintained. He is doing well without evident respiratory symptoms.

Fig. 4. Post-bronchoplastic stenosis of a 38-year-old man (patient 6). a) Pre-balloon dilation bronchoscopic view shows pinhole size opening of the right main bronchus. b) At follow up bronchoscopy 3 years after BBD an almost normal lumen of the right main bronchus is

Fig. 3. Tuberculous bronchial stenosis of a 19-year-old man (patient 5). a) Pre-balloon dilation bronchoscopic view shows severe stenosis at the left main bronchus. The orifice is almost obstructed. b) Bronchoscopy three years after balloon dilation shows an almost

normal airway. His symptoms immediately improved and he has done well.

Fig. 5. Tuberculous tracheal and right main bronchial stenosis of a 48-year-old female (patient 7). She had progressive severe dyspnea at rest with continuous coughing and stridor. Three-dimensional reconstruction CT shows 60mm segment of 8mm diameter severe narrowing from upper trachea to right main bronchus.

(a) (b) (c)

Fig. 6. a) Pre-balloon dilation bronchoscopic view of patient 7 shows severe long segmental stenosis at the trachea. b) Immediately after balloon dilation, a deep laceration is observed from the trachea to the right main bronchus at the membrane portion, but the patient is stable and asymptomatic. c) Two months later, the laceration is spontaneously healed and the airway is markedly wider than before dilation. Following the balloon dilation the patient is less dyspnetic at rest and can perform housework without becoming short of breath.

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 145

(a) (b)

(c) (d)

trachea (c) and the right main bronchus (d).

Fig. 9. Chest CT of patient 7 shows severe stenosis of the trachea (a) and the right main bronchus (b) before BBD. However, BBD brings a significant increase in the diameter of the

 (a) (b) (c) Fig. 7. a) Pre-balloon dilation bronchoscopic view of patient 7 shows severe stenosis of the right main bronchus. b) Immediately after balloon dilation, a deep laceration is observed at the right main bronchus. c) Bronchoscopic findings two months after dilation demonstrate that the laceration is spontaneously healed and the airway is significantly improved.

(a) (b)

Fig. 8. a) Fluoroscopic image of patient 7 obtained at the beginning of balloon inflation clearly demonstrates a waist (arrow) on the wall of the balloon at the level of the severe part of the stenosis. b) Fluoroscopic image obtained at the end of the dilation no longer shows a waist.

(a) (b) (c)

(a) (b)

waist.

Fig. 8. a) Fluoroscopic image of patient 7 obtained at the beginning of balloon inflation clearly demonstrates a waist (arrow) on the wall of the balloon at the level of the severe part of the stenosis. b) Fluoroscopic image obtained at the end of the dilation no longer shows a

Fig. 7. a) Pre-balloon dilation bronchoscopic view of patient 7 shows severe stenosis of the right main bronchus. b) Immediately after balloon dilation, a deep laceration is observed at the right main bronchus. c) Bronchoscopic findings two months after dilation demonstrate that the laceration is spontaneously healed and the airway is significantly improved.

(c) (d)

Fig. 9. Chest CT of patient 7 shows severe stenosis of the trachea (a) and the right main bronchus (b) before BBD. However, BBD brings a significant increase in the diameter of the trachea (c) and the right main bronchus (d).

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 147

(a) (b)

(c) (d)

film evidence of atelectasis for 2 years.

Fig. 12. a) Chest CT of patient 8 shows the stenosis of the left main bronchus (arrow). b) Chest CT shows the atelectasis of the left lower lobe caused by tuberculous bronchial stenosis (arrow heads). c) After balloon dilation. Chest CT shows increase of the diameter of the left main bronchus (arrow). d) After balloon dilation, the atelectasis is obliterated and the left lower lobe is expanded (arrow heads). He has been without symptoms and chest

Fig. 10. Tuberculous stenosis of the left main bronchus and left lower bronchus of a 30-yearold male (patient 8). He developed continuous stridor and cough. Three-dimensional reconstruction CT shows irregular luminal narrowing from the left main bronchus to the left lower bronchus (arrow).

Fig. 11. a-b) Pre-balloon dilation bronchoscopic view of patient 8 shows severe stenosis at the left main bronchus (a) and the left lower bronchus (arrow in (b)). c-d) Bronchoscopic view shows improvement of the stenosis at the left main bronchus (c) and the left lower bronchus (d) after balloon dilation.

(c) (d)

Fig. 10. Tuberculous stenosis of the left main bronchus and left lower bronchus of a 30-yearold male (patient 8). He developed continuous stridor and cough. Three-dimensional reconstruction CT shows irregular luminal narrowing from the left main bronchus to the left

(a) (b)

(c) (d)

bronchus (d) after balloon dilation.

Fig. 11. a-b) Pre-balloon dilation bronchoscopic view of patient 8 shows severe stenosis at the left main bronchus (a) and the left lower bronchus (arrow in (b)). c-d) Bronchoscopic view shows improvement of the stenosis at the left main bronchus (c) and the left lower

lower bronchus (arrow).

(a) (b)

(c) (d)

Fig. 12. a) Chest CT of patient 8 shows the stenosis of the left main bronchus (arrow). b) Chest CT shows the atelectasis of the left lower lobe caused by tuberculous bronchial stenosis (arrow heads). c) After balloon dilation. Chest CT shows increase of the diameter of the left main bronchus (arrow). d) After balloon dilation, the atelectasis is obliterated and the left lower lobe is expanded (arrow heads). He has been without symptoms and chest film evidence of atelectasis for 2 years.

Bronchoscopic Balloon Dilation (BBD) for Benign Tracheobronchial Stenosis 149

Ball, JB.; Delaney, JC.; Evans, CC.; Donnelly, RJ. & Hind, CRK. (1991). Endoscopic bougie

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Fig. 13. All patients who underwent pulmonary function testing showed improvement of forced expiratory volume in 1 second (FEV1), peak expiratory flow (PEF) and Hugh-Jones classification.


Table 3. Hugh-Jones classification

#### **6. Conclusion**

Bronchoscopic balloon dilation is a very useful therapy for benign tracheobronchial stenosis. The advantages of this procedure in comparison with other procedures are that it is minimally invasive, safe, and rapid. It can be performed under either local or general anesthesia. Balloon dilation can be performed safely and effectively because the balloon placement and inflation-deflation can be monitored via both fluoroscopy and bronchoscopy. A guidewire permits easy exchange of the balloon catheter. A relatively common complication is transmural laceration, but lacerations should be regarded as an expected result of sufficient balloon dilation and not as a major complication. No deaths have been attributed directly to balloon dilation alone. Only fibrous stenosis responds to balloon dilation alone; bronchial stenosis with coexisting tracheobronchomalacia usually requires combination therapy with another therapeutic modality such as stent placement to maintain bronchial patency. The procedure often needs to be repeated to achieve a satisfactory result.

#### **7. References**

Auerbach, O. (1949). Tuberculosis of the trachea and major bronchi. *Am Rev Tuberc*, Vol.60, pp. 604-620.

(a) (b) (c)

<sup>I</sup>The patient's breathing is as good as that of others of the same sex, age, and build while at work, on

II The patient is able to walk with healthy persons of the same sex, age, and build on the level but is

III The patient is unable to keep up with healthy persons on the level but is able to walk a mile or more

IV The patient is unable to walk more than about 100 yards on the level without a rest

<sup>V</sup>The patient is breathless on talking or undressing or is unable to leave the house because of

Bronchoscopic balloon dilation is a very useful therapy for benign tracheobronchial stenosis. The advantages of this procedure in comparison with other procedures are that it is minimally invasive, safe, and rapid. It can be performed under either local or general anesthesia. Balloon dilation can be performed safely and effectively because the balloon placement and inflation-deflation can be monitored via both fluoroscopy and bronchoscopy. A guidewire permits easy exchange of the balloon catheter. A relatively common complication is transmural laceration, but lacerations should be regarded as an expected result of sufficient balloon dilation and not as a major complication. No deaths have been attributed directly to balloon dilation alone. Only fibrous stenosis responds to balloon dilation alone; bronchial stenosis with coexisting tracheobronchomalacia usually requires combination therapy with another therapeutic modality such as stent placement to maintain bronchial patency. The procedure often needs to be repeated to achieve a satisfactory result.

Auerbach, O. (1949). Tuberculosis of the trachea and major bronchi. *Am Rev Tuberc*, Vol.60,

Fig. 13. All patients who underwent pulmonary function testing showed improvement of forced expiratory volume in 1 second (FEV1), peak expiratory flow (PEF) and Hugh-Jones

classification.

walking, or on climbing hills or stairs

unable to keep up on hills or stairs

at a slower speed

breathlessness Table 3. Hugh-Jones classification

**6. Conclusion** 

**7. References** 

pp. 604-620.


**9** 

*Italy* 

**Endoscopic Percutaneous** 

**Tracheotomy in Prolonged Intubation of** 

**Mechanical Ventilated Patients Admitted** 

Recent advances in surgical and anesthesia technology and biotechnology have made the intensive management of patients who have undergone open heart procedures more

New interventions and treatment strategies are desirable to improve the outcomes of this specific group of patients. Tracheotomy was performed mainly to prevent laryngeal and upper airway damage due to prolonged tracheal intubation after cardiac or thoracic surgery

In this chapter we will review and discuss the percutaneous dilational tracheotomy (PDT) approach in cardiac surgery patients who need prolonged mechanical ventilation. Available data were located regarding the technique, timing, advantages and complications of the PDT. We also underlined the utility of bronchoscopy control during the procedure. We describe also our experience performing PDT with bronchoscopy control procedure on patients admitted to Cardiothoracic Intensive Care Unit (CTICU) patients. In our CTICU we have a long-term experience of tracheotomy with bronchoscopy control that yields better

The features of cardiac surgery patients are changing, mainly regarding the increasing numbers of the elderly patients, re-operated patients, patients with advanced heart disease, and with many severe co-morbidities. The number of patients undergoing simultaneous coronary artery by-pass grafting (CABG) and valve replacement, ventricular aneurysmectomy, aortic surgery, or carotid endoarterectomy has also increased, as well as the number of patients undergoing transplant and/or implantation of ventricular assist

This new profile of cardiac surgical patient has lead to an increasing demand for high-tech

**1. Introduction** 

or medical illness.

clinical practice and outcome.

**2. New cardiac surgery patient profile** 

device as a bridge to transplant by the Intensive Care Units (ICU).

medical interventions, such as mechanical ventilation in ICU.

demanding.

**in Cardio-Thoracic Intensive Care Unit** 

Rosa Mastropierro, Michela Bettinzoli and Aldo Manzato *Division of Cardiothoracic Intensive Care Unit, Spedali Civili Brescia* 


## **Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit**

Rosa Mastropierro, Michela Bettinzoli and Aldo Manzato *Division of Cardiothoracic Intensive Care Unit, Spedali Civili Brescia Italy* 

#### **1. Introduction**

150 Global Perspectives on Bronchoscopy

Kim, JH.; Shin, JH.; Song, HY.; Shim, TS.; Ko, GY.; Yoon, HK. & Sung, KB. (2007).

Kim, YH.; Sung, DJ.; Cho, SB.; Chung, KB.; Cha, SH.; Park, HS. & Um, JW. (2006). Deep

Knott, PD.; Lorenz, RR.; Eliachar, I. & Murthy, SC. (2004). Reconstruction of a

Larson, BJ.; Zumberg, MS. & Kitchens CS. (2005). A feasibility study of continuing dose-

Lee, KH.; Ko, GY. Song, HY. Shim, TS. & Kim, WS. (2002). Benign tracheobronchial stenoses:

Lee, KW.; Im, JG.; Han, JK.; Kim, TK.; Park, JH. & Yeon, KM. (1999). Tuberculous stenosis of

Mayse, ML.; Greenheck, J.; Friedman, M. & Kovitz, KL. (2004). Successful bronchoscopic

McDonald, IH. & Stocks, JG. (1965). Prolonged nasotracheal intubation. *Br J Anaesth*, Vol.37,

Morcos, SK.; Baudouin, SV.; Anderson, PB.; Beedie, R. & Bury, RW. (1989). Iotrolan in

Morcos, SK.; Anderson, PB.; Baudouin, SV.; Clout, C.; Fairlie, N.; Baudouin, C. & Warnock,

Nakamura, K.; Terada, N.; Ohi, M.; Matsushita, T.; Kato, N. & Nakagawa, T. (1991).

Olsson, T.; Bjornstad-Pettersen, H. & Stjernberg, NL. (1979). Bronchostenosis due to

Parkin, JL.; Stevens, MH. & Jung, AL. (1976). Acquired and congenital subglottic stenosis in

Riebel, T. & Wartner, R. (1990). Use of non-ionic contrast media for tracheobronchography

Rooney, CP.; Ferguson, JS.; Barnhart, W.; Cook-Granroth, J.; Ross, A.; Hoffman, EA. &

Sheski, FD. & Mathur, PN. (1998). Long-term results of fiberoptic bronchoscopic balloon

Wilson, NJ. (1945). Bronchoscopic observations in tuberculous tracheobronchitis-clinical and

McLennan, G. (2005). Use of 3-dimensional computed tomography reconstruction studies in the preoperative assessment of patients undergoing balloon dilatation for

dilation in the management of benign tracheobronchial stenosis. *Chest*, Vol.114,

and clinical significance. *Chest*, Vol.131, No.4, pp. 1114-1117.

reports of two patients. *Br J Radiol*, Vol.79, pp. 529-535.

*Surg*, Vol.3, pp. 554-556.

909-914.

pp. 161-173.

No.736, pp. 383-385.

Vol.157, pp. 1187-1188.

No.3. pp. 796-800.

risk. *Chest*, Vol.127, No.3, pp. 922-927.

*Interv Radiol*, Vol.10, No.3, pp. 352-358.

fluoroscopy. *Chest*, Vol.126, No.2, pp. 634-637.

fiberoptic bronchoscope. *Thorax*, Vol.45, pp. 628-629.

the infant. *Ann Otol Rhinol Laryngol*, Vol.85, pp. 573-581.

tracheobronchial stenosis. *Respiration*, Vol.72, pp. 579-586.

pathological correlation. *Dis Chest*, Vol.11, pp.36-59.

in neonates and young infants. *Eur J Radiol*, Vol.11, pp. 120-124.

sarcoidosis. *Chest*, Vol.75, No.6, pp. 663-666.

Tracheobronchial laceration after balloon dilation for benign strictures: incidence

tracheal laceration after balloon dilation for benign tracheobronchial stenosis: case

tracheobronchial tree disruption with bovine pericardium. *Int Cardiovasc Thorac* 

reduced warfarin for invasive procedures in patients with high thromboembolic

long-term clinical experience with balloon dilation. *J Vasc Interv Radiol*, Vol.13, pp.

the left main bronchus: results of treatment with balloons and metallic stents. *J Vasc* 

balloon dilation of nonmalignant tracheobronchial obstruction without

selective bronchography via the fiberoptic bronchoscope. *Br J Radiol*, Vol.62,

N. (1990). Suitability of and tolerance to Iotrolan 300 in bronchograhy via the

Tuberculous bronchial stenosis: treatment with balloon bronchoplasty. *AJR*,

Recent advances in surgical and anesthesia technology and biotechnology have made the intensive management of patients who have undergone open heart procedures more demanding.

New interventions and treatment strategies are desirable to improve the outcomes of this specific group of patients. Tracheotomy was performed mainly to prevent laryngeal and upper airway damage due to prolonged tracheal intubation after cardiac or thoracic surgery or medical illness.

In this chapter we will review and discuss the percutaneous dilational tracheotomy (PDT) approach in cardiac surgery patients who need prolonged mechanical ventilation. Available data were located regarding the technique, timing, advantages and complications of the PDT. We also underlined the utility of bronchoscopy control during the procedure. We describe also our experience performing PDT with bronchoscopy control procedure on patients admitted to Cardiothoracic Intensive Care Unit (CTICU) patients. In our CTICU we have a long-term experience of tracheotomy with bronchoscopy control that yields better clinical practice and outcome.

#### **2. New cardiac surgery patient profile**

The features of cardiac surgery patients are changing, mainly regarding the increasing numbers of the elderly patients, re-operated patients, patients with advanced heart disease, and with many severe co-morbidities. The number of patients undergoing simultaneous coronary artery by-pass grafting (CABG) and valve replacement, ventricular aneurysmectomy, aortic surgery, or carotid endoarterectomy has also increased, as well as the number of patients undergoing transplant and/or implantation of ventricular assist device as a bridge to transplant by the Intensive Care Units (ICU).

This new profile of cardiac surgical patient has lead to an increasing demand for high-tech medical interventions, such as mechanical ventilation in ICU.

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

managed by intensivists, without specialized surgical training.

by lab parameters.

**4.2 Setting and patient preparation** 

dose of second generation cefalosporin.

100% oxygen throughout the tracheotomy.

hours with a standard tracheotomy.

bedside tracheotomy can be performed.

the cricoid cartilage (De Leyn et al., 2007).

**4.5 Percutaneous dilational tracheotomy** 

for arterial catheterization.

**4.4 Open surgical tracheotomy** 

**4.3 Cricothyroidotomy** 

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 153

As with any procedure, the decision to perform an emergency tracheotomy is not influenced

The old method of performing tracheotomy in critically ill patients requires transport from the intensive care unit (ICU) to the operating theatre, were the surgical team performed the tracheotomy. The percutaneous technique, for the limited dissection, results in less tissue damage and lower bleeding, and can be performed at the bedside on the ICU avoiding the risks related to the patients transportation. Furthermore, this technique can be successfully

The patient usually has already a translaringeal endotracheal (TE) tube in place before tracheotomy. Continuous vital signs, pulse-oximetry, and complete ventilatory parameters are monitored throughout the procedure, antibiotic prophyaxis is necessary with a single

General anesthesia is performed, using propofol, fentanyl, and pancuronium. Ten minutes before the tracheotomy procedure the positive end-expiratory pressure was reduced stepwise to 5 mm Hg if required, and all patients received positive-pressure ventilation with

Cricothyroidotomy can be used to gain emergency access to the airway, but as it is associated with numerous complications, it is suggested to replace this tube within 48–72

Elective surgical tracheotomy (ST) is ideally performed in the operation room. However,

The technique has changed very little since its original description by Chevalier Jackson (Jackson, 1909). Briefly, a 4 cm to 5 cm vertical or horizontal skin incision is made 1 cm below the cricoid cartilage over the second to fourth tracheal rings and the pretracheal tissues are dissected; the endotracheal tube is slowly withdrawn to just above the tracheotomy incision, but not removed, in case difficulty in tracheotomy placement requires its urgent reinsertion. Finally the tube is inserted into the tracheotomy under direct vision. As animal experiments suggest, the injury to the cricoid cartilage was a major risk factor for subsequent subglottic stenosis, De Leyn recommended placing the tracheostoma well below

The theoretical basis for the development of all percutaneous procedures is represented by the Seldinger's method that, since 1953, planned the needle replacement over a wire-guided

This approach requires to place a tube through the cricothyroid membrane.

Many of these patients are able to resume spontaneous ventilation as soon as they recovered from the anesthesia. The decision to extubate a patient depend on the recovery of physiological homeostasis, through return to normothermia, adequate heart and lung function, intravascular volume replacement, electrolyte normalization and optimization of pain relief. The extubation can be perform 24 hours a day as soon as these criteria are met.

The clinical and economic advantages of early extubation (within 4-8 hours after the ICU admission) are widely documented and show very positive results (Rajakaruna et al., 2005). This procedure has mainly reduced the adverse effects of positive pressure ventilation, including barotraumas. It has also decrease the potential incidence of infections and has minimized patient discomfort. Many studies have also shown that it reduces the length of intensive care unit, and therefore hospital stay and related costs (Rajakaruna et al., 2005).

However, approximately 2.6% to 22.7% of patients still require prolonged mechanical ventilation (PMV). This large variability depends on the selected criteria and guidelines adopted to define PMV. For example, Rajakaruna et al (Rajakaruna et al., 2005) conducted an observational study of 7553 patients and concluded that the PMV condition should be defined by a time period of more than 96 hours; while Alfieri et al (Pappalardo et al., 2004), studying the long-term survival and quality of life of 4827 adult cardiac surgical patients, define the PMV duration as more than seven days. Our literature review does not indicate a consensus regarding the exact definition of PMV.

#### **3. Risk factors and clinical and economic effects of the PMV**

Prolonged mechanical ventilation after cardiac and thoracic operations has become increasingly common over the past years. To rationalize the ICU work, improve the outcomes of this patients and contain the health care cost in literature (Trouillet et al., 2011) we identified a list of risk factors of PMV. Many authors (Cislaghi et al., 2009; Murthy et al., 2007; Trouillet et al., 2011) found implication of *preoperative* variables such as old age, higher BMI, diabetes mellitus, high pulmonary arterial blood pressure, New York Heart Association (NYHA) class higher than 2, ejection fraction under 50%, preoperative intraaortic balloon pump, creatinine clearance lower than 50 mL/min, operative priority. *Intraoperative* variables include the type of surgery (multiple valve replacement, aortic procedures, heart transplantation and reoperation), cardiopulmonary bypass (CPB) duration, intraaortic balloon pump. *Postoperative* variables include SAPS II higher than 45, neurologic event, lung injury, renal failure, internal bleeding, major arrhythmia.

Moreover several studies (Cislaghi et al., 2009; Trouillet et al., 2011) suggest that PVM is associated with higher in-hospital morbidity, mortality, and costs.

#### **4. Technique**

#### **4.1 Lab studies**

Many tracheotomies are electively performed on patients with secure airways (eg, for prolonged intubation) therefore it is reasonable to control hematologic parameters including hemoglobin (Hb), platelet count (PC) prothrombin time (PT), partial prothrombin time (PTT), and INR since it became available in 1998. A adequate correction must be eventually assured to take PC to a value greater than 50, and INR to a value of less than 1.5.

As with any procedure, the decision to perform an emergency tracheotomy is not influenced by lab parameters.

#### **4.2 Setting and patient preparation**

152 Global Perspectives on Bronchoscopy

Many of these patients are able to resume spontaneous ventilation as soon as they recovered from the anesthesia. The decision to extubate a patient depend on the recovery of physiological homeostasis, through return to normothermia, adequate heart and lung function, intravascular volume replacement, electrolyte normalization and optimization of pain relief. The extubation can be perform 24 hours a day as soon as these criteria are met. The clinical and economic advantages of early extubation (within 4-8 hours after the ICU admission) are widely documented and show very positive results (Rajakaruna et al., 2005). This procedure has mainly reduced the adverse effects of positive pressure ventilation, including barotraumas. It has also decrease the potential incidence of infections and has minimized patient discomfort. Many studies have also shown that it reduces the length of intensive care unit, and therefore hospital stay and related costs (Rajakaruna et al., 2005).

However, approximately 2.6% to 22.7% of patients still require prolonged mechanical ventilation (PMV). This large variability depends on the selected criteria and guidelines adopted to define PMV. For example, Rajakaruna et al (Rajakaruna et al., 2005) conducted an observational study of 7553 patients and concluded that the PMV condition should be defined by a time period of more than 96 hours; while Alfieri et al (Pappalardo et al., 2004), studying the long-term survival and quality of life of 4827 adult cardiac surgical patients, define the PMV duration as more than seven days. Our literature review does not indicate a

Prolonged mechanical ventilation after cardiac and thoracic operations has become increasingly common over the past years. To rationalize the ICU work, improve the outcomes of this patients and contain the health care cost in literature (Trouillet et al., 2011) we identified a list of risk factors of PMV. Many authors (Cislaghi et al., 2009; Murthy et al., 2007; Trouillet et al., 2011) found implication of *preoperative* variables such as old age, higher BMI, diabetes mellitus, high pulmonary arterial blood pressure, New York Heart Association (NYHA) class higher than 2, ejection fraction under 50%, preoperative intraaortic balloon pump, creatinine clearance lower than 50 mL/min, operative priority. *Intraoperative* variables include the type of surgery (multiple valve replacement, aortic procedures, heart transplantation and reoperation), cardiopulmonary bypass (CPB) duration, intraaortic balloon pump. *Postoperative* variables include SAPS II higher than 45,

consensus regarding the exact definition of PMV.

**3. Risk factors and clinical and economic effects of the PMV** 

neurologic event, lung injury, renal failure, internal bleeding, major arrhythmia.

assured to take PC to a value greater than 50, and INR to a value of less than 1.5.

associated with higher in-hospital morbidity, mortality, and costs.

**4. Technique 4.1 Lab studies** 

Moreover several studies (Cislaghi et al., 2009; Trouillet et al., 2011) suggest that PVM is

Many tracheotomies are electively performed on patients with secure airways (eg, for prolonged intubation) therefore it is reasonable to control hematologic parameters including hemoglobin (Hb), platelet count (PC) prothrombin time (PT), partial prothrombin time (PTT), and INR since it became available in 1998. A adequate correction must be eventually The old method of performing tracheotomy in critically ill patients requires transport from the intensive care unit (ICU) to the operating theatre, were the surgical team performed the tracheotomy. The percutaneous technique, for the limited dissection, results in less tissue damage and lower bleeding, and can be performed at the bedside on the ICU avoiding the risks related to the patients transportation. Furthermore, this technique can be successfully managed by intensivists, without specialized surgical training.

The patient usually has already a translaringeal endotracheal (TE) tube in place before tracheotomy. Continuous vital signs, pulse-oximetry, and complete ventilatory parameters are monitored throughout the procedure, antibiotic prophyaxis is necessary with a single dose of second generation cefalosporin.

General anesthesia is performed, using propofol, fentanyl, and pancuronium. Ten minutes before the tracheotomy procedure the positive end-expiratory pressure was reduced stepwise to 5 mm Hg if required, and all patients received positive-pressure ventilation with 100% oxygen throughout the tracheotomy.

#### **4.3 Cricothyroidotomy**

This approach requires to place a tube through the cricothyroid membrane.

Cricothyroidotomy can be used to gain emergency access to the airway, but as it is associated with numerous complications, it is suggested to replace this tube within 48–72 hours with a standard tracheotomy.

#### **4.4 Open surgical tracheotomy**

Elective surgical tracheotomy (ST) is ideally performed in the operation room. However, bedside tracheotomy can be performed.

The technique has changed very little since its original description by Chevalier Jackson (Jackson, 1909). Briefly, a 4 cm to 5 cm vertical or horizontal skin incision is made 1 cm below the cricoid cartilage over the second to fourth tracheal rings and the pretracheal tissues are dissected; the endotracheal tube is slowly withdrawn to just above the tracheotomy incision, but not removed, in case difficulty in tracheotomy placement requires its urgent reinsertion. Finally the tube is inserted into the tracheotomy under direct vision.

As animal experiments suggest, the injury to the cricoid cartilage was a major risk factor for subsequent subglottic stenosis, De Leyn recommended placing the tracheostoma well below the cricoid cartilage (De Leyn et al., 2007).

#### **4.5 Percutaneous dilational tracheotomy**

The theoretical basis for the development of all percutaneous procedures is represented by the Seldinger's method that, since 1953, planned the needle replacement over a wire-guided for arterial catheterization.

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

tube which is secured with a strap tied around the neck.

2000).

specimens (PSB).

of vessels.

cleaning and suctioning as required.

**4.7 Comparison from different PDT techniques** 

extensively (An˜ n et al., 2004; Ambesh et al., 2002).

or by the way in which these complications have been examined.

is advanced cranially towards the larynx.

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 155

The broncoscopic placed in the endotracheal tube, having deflated endotracheal tube cuff with tapes loosened, together are withdrawn slowly to just below the vocal cords. Then the assistant held the tube with his hands continuously throughout the whole procedure and handles manual ventilation on a regimen of 1.0 FIO2. The anatomical landmarks is identified by fiberoptic transillumination and digital manipulation of the trachea, approximately 2 fingerbreadths below the cricoid or 1 fingerbreadths above the sternal notch (Byhahn et al.,

After identification of the translaryngeal puncture point, a 16-gauge Teflon introducer needle is inserted midline through the anterior wall of the trachea, between the first and second or second and third tracheal rings. The needle is withdrawn and replaced by the Jtipped guide-wire which is advanced through the Teflon sheath, toward the carina. The catheter sheath is removed and beveled plastic single dilator, held like a pen, and forced into the tracheal wall over the guide-wire, to create a tracheostoma. Once the tracheostoma has been dilated to the appropriated size, the loading dilator is removed to permit insertion of a specially tracheotomy tube into the trachea over the same guide-wire, using one of the dilators as a obturator. The cuff is inflated and ventilation resumes through the tracheotomy

The bronchoscope, removed from the endotracheal tube, is placed through the tracheotomy tube to check its right position, to remove blood or bronchial secretions and, if necessary to collect the bronchoalveolar lavage (BAL), quantitative tracheal aspirate, or protected brush

A dry dressing is applied to the neck and routine tracheotomy care is conducted, with

In 30% of the PDT, the tube passes through the thyroid isthmus, but bleeding is very rare, because the tracheotomy tube, being tightly fitting to the wall, acts as tamponade bleeding

The percutaneous techniques are based on the principle of tracheal puncture, stoma creation by dilation of the soft tissues of the neck and insertion of the tracheal tube, using the Seldinger technique. The differences are the shape and the managing of the dilator. Only the TLT is a reversed method in which, in contrast to the others procedures, the Seldinger wire

Few trials were published comparing these techniques, and very little information is available concerning the comparison of their early and late complications. Problems may be represented by the lack of precise definitions of outcome and early and late complications,

The studies that have been published so far on this topic are generally limited, and not adequately randomized. The follow-up of the tracheotomy patients can be difficult because of physical and mental problems. Therefore complications have not been investigated

The translaringeal tube is withdrawn when adequate ventilation is verified.

The wire-guided percutaneous technique for percutaneous tracheostomy was developed and reported in the same year by the American surgeon Ciaglia, who combined the Seldinger wire nephrostomy tube multiple-dilator placement technique with a special, lowprofile tracheostomy tube (Ciaglia et al, 1985).

Several different methods of performing percutaneous tracheostomy have been subsequently described.

#### **4.5.1 The main different percutaneous techniques**

Ciaglia first described PDT in 1985. The technique is based on progressive dilatation of a small initial tracheal aperture created by a needle, using a series of graduated dilators.

In 1990 Griggs described the Guidewire Dilating Forceps (GWDF) technique of percutaneous tracheotomy. It is based on enlarging a small tracheal aperture with a forceps, having a blunt tip and blunt edges.

In 1997 Fantoni and Ripamonti introduced the retrograd translaryngeal technique (TLT), another minimally invasive procedure achieved using a single device under direct vision with a rigid tracheoscope (RCT), subsequently replaced by a flexible fiberoptic bronchoscope (FFB).

In 1998, a modification of the Ciaglia technique was introduced (Ciaglia Blue Rhino Percutaneous Tracheotomy Introducer Kit; Cook Critical Care Inc., Bloomington, IN), whereby the series of dilators was replaced with a single, sharply tapered dilator, permitting complete dilatation in one step. It has been shown that the single dilator technique decreased operative time compared with the serial-dilator technique without increasing the complication rate.

However in 2002 Frova and Quintel described another procedure named PercuTwist, consisting in a single-step rotating dilatation tracheotomy applied with the use of a screwlike dilatators. The device is threaded into the tracheal stoma using a lifting motion.

In the present study we want describe in detail the Single Dilatator Ciaglia Blue Rhino Percutaneous Tracheotomy Technique with endoscopic guidance.

#### **4.6 Ciaglia technique**

The patient has usually endotracheal tube in place (regarding lab study, general anesthesia and antibiotic prophylaxis see above); the whole procedure is performed in direct vision with flexible bronchoscopy (BF-P240 or BF-40; Olympus; Tokyo, Japan) via translaryngeal tube.

Ciaglia technique is performed using the Ciaglia single dilator kit (Ciaglia Blue Rhino, Cook Critical Care, Bloomington, Illinois).

Vital signs are continuously monitored throughout the procedure, personnel are positioned with the operator to the patient's right, the bronchoscopist at the head of the bed, a circulating nurse is available to administer medications and otherwise assist in the procedure.

At the start the patient's neck is slightly reclined, inspected in detail, landmark points are indentified. The surgical area is cleansed and prepared with surgical drapes in the typical manner.

The wire-guided percutaneous technique for percutaneous tracheostomy was developed and reported in the same year by the American surgeon Ciaglia, who combined the Seldinger wire nephrostomy tube multiple-dilator placement technique with a special, low-

Several different methods of performing percutaneous tracheostomy have been

Ciaglia first described PDT in 1985. The technique is based on progressive dilatation of a small initial tracheal aperture created by a needle, using a series of graduated dilators.

In 1990 Griggs described the Guidewire Dilating Forceps (GWDF) technique of percutaneous tracheotomy. It is based on enlarging a small tracheal aperture with a forceps,

In 1997 Fantoni and Ripamonti introduced the retrograd translaryngeal technique (TLT), another minimally invasive procedure achieved using a single device under direct vision with a rigid tracheoscope (RCT), subsequently replaced by a flexible fiberoptic

In 1998, a modification of the Ciaglia technique was introduced (Ciaglia Blue Rhino Percutaneous Tracheotomy Introducer Kit; Cook Critical Care Inc., Bloomington, IN), whereby the series of dilators was replaced with a single, sharply tapered dilator, permitting complete dilatation in one step. It has been shown that the single dilator technique decreased operative time compared with the serial-dilator technique without increasing the

However in 2002 Frova and Quintel described another procedure named PercuTwist, consisting in a single-step rotating dilatation tracheotomy applied with the use of a screw-

In the present study we want describe in detail the Single Dilatator Ciaglia Blue Rhino

The patient has usually endotracheal tube in place (regarding lab study, general anesthesia and antibiotic prophylaxis see above); the whole procedure is performed in direct vision with flexible bronchoscopy (BF-P240 or BF-40; Olympus; Tokyo, Japan) via translaryngeal tube.

Ciaglia technique is performed using the Ciaglia single dilator kit (Ciaglia Blue Rhino, Cook

Vital signs are continuously monitored throughout the procedure, personnel are positioned with the operator to the patient's right, the bronchoscopist at the head of the bed, a circulating

At the start the patient's neck is slightly reclined, inspected in detail, landmark points are indentified. The surgical area is cleansed and prepared with surgical drapes in the typical

nurse is available to administer medications and otherwise assist in the procedure.

like dilatators. The device is threaded into the tracheal stoma using a lifting motion.

Percutaneous Tracheotomy Technique with endoscopic guidance.

profile tracheostomy tube (Ciaglia et al, 1985).

**4.5.1 The main different percutaneous techniques** 

subsequently described.

bronchoscope (FFB).

complication rate.

**4.6 Ciaglia technique** 

manner.

Critical Care, Bloomington, Illinois).

having a blunt tip and blunt edges.

The broncoscopic placed in the endotracheal tube, having deflated endotracheal tube cuff with tapes loosened, together are withdrawn slowly to just below the vocal cords. Then the assistant held the tube with his hands continuously throughout the whole procedure and handles manual ventilation on a regimen of 1.0 FIO2. The anatomical landmarks is identified by fiberoptic transillumination and digital manipulation of the trachea, approximately 2 fingerbreadths below the cricoid or 1 fingerbreadths above the sternal notch (Byhahn et al., 2000).

After identification of the translaryngeal puncture point, a 16-gauge Teflon introducer needle is inserted midline through the anterior wall of the trachea, between the first and second or second and third tracheal rings. The needle is withdrawn and replaced by the Jtipped guide-wire which is advanced through the Teflon sheath, toward the carina. The catheter sheath is removed and beveled plastic single dilator, held like a pen, and forced into the tracheal wall over the guide-wire, to create a tracheostoma. Once the tracheostoma has been dilated to the appropriated size, the loading dilator is removed to permit insertion of a specially tracheotomy tube into the trachea over the same guide-wire, using one of the dilators as a obturator. The cuff is inflated and ventilation resumes through the tracheotomy tube which is secured with a strap tied around the neck.

The bronchoscope, removed from the endotracheal tube, is placed through the tracheotomy tube to check its right position, to remove blood or bronchial secretions and, if necessary to collect the bronchoalveolar lavage (BAL), quantitative tracheal aspirate, or protected brush specimens (PSB).

The translaringeal tube is withdrawn when adequate ventilation is verified.

A dry dressing is applied to the neck and routine tracheotomy care is conducted, with cleaning and suctioning as required.

In 30% of the PDT, the tube passes through the thyroid isthmus, but bleeding is very rare, because the tracheotomy tube, being tightly fitting to the wall, acts as tamponade bleeding of vessels.

#### **4.7 Comparison from different PDT techniques**

The percutaneous techniques are based on the principle of tracheal puncture, stoma creation by dilation of the soft tissues of the neck and insertion of the tracheal tube, using the Seldinger technique. The differences are the shape and the managing of the dilator. Only the TLT is a reversed method in which, in contrast to the others procedures, the Seldinger wire is advanced cranially towards the larynx.

Few trials were published comparing these techniques, and very little information is available concerning the comparison of their early and late complications. Problems may be represented by the lack of precise definitions of outcome and early and late complications, or by the way in which these complications have been examined.

The studies that have been published so far on this topic are generally limited, and not adequately randomized. The follow-up of the tracheotomy patients can be difficult because of physical and mental problems. Therefore complications have not been investigated extensively (An˜ n et al., 2004; Ambesh et al., 2002).

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

earlier oral nutrition and bed-to chair transfer (Trouillet et al., 2009).

(Rumbak et al., 2004).

timing of the procedure.

window.

(De Leyn et al., 2007).

50% in first group (Rumbak et al., 2004).

Melot 2005).

prolonged ICU stay (Arabi et al., 2004).

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 157

better patient's comfort and safety, facilitating progression of care in and outside the ICU

Yaseen Arabi et al., in a cohort study and review, analyzed 136 trauma ICU patients who required tracheotomies, confirmed all these benefits of early tracheotomy and moreover he found, with a multivariate analysis, that late tracheotomy was an independent predictor of

However others studies, including the large multicenter TracMan (Tracheostomy management in critical care, 2011) trial have found no differences between early and late

In a large prospective trial, Trouillet et al., randomized patients who required prolonged mechanical ventilation after heart surgery, assigning to early tracheotomy (5 days after surgery) or prolonged intubation followed by tracheotomy 15 days after randomization. In this study early tracheotomy provided no benefits in term of mechanical ventilation duration, LOS, mortality rate, or frequency of infectious complications, but it was associated with a lower rate of agitation or delirium, with less sedative, analgesic and neuroleptic consumption and better patient comfort, fewer unscheduled estubation and re-intubation,

A systematic review, including randomized and non-randomized studies, has not been able to support the effects of tracheotomy on duration of mechanical ventilation in all patients (Griffiths et al., 2005). The effects of early tracheotomy on mechanical ventilation, VAP, hospital outcome and LOS, remaining hotly debated. Therefore, there is still no consensus about "early" or "late tracheotomy" definition, many clinicians use their own specific time

In 2001 Guidelines, created jointly by the American Association for Respiratory Care, the American College of Chest Physicians, and the American College of Critical Care Medicine, make no specific recommendations about tracheotomy timing, but suggest that the procedure should be considered if the patient will require prolonged ventilator assistance

In 2005 surveys involving a large number of ICU from France and the United Kingdom documented variability for both the timing and the indications for tracheostomy (Blot &

Contemporary the group of Rumbak in a prospective, randomized study, comparing early with late tracheotomy, he defined "early tracheotomy", if performed within 48 hours and "late tracheotomy" if performed at 2 weeks. The authors showed a decrease of mortality by

The same authors in a 2007 study confirmed that early tracheotomy reduces time in the ICU, on mechanical ventilation, and in the hospital, whereas benefits regarding incidence of pneumonia and mortality are variable according to the different patient population ().

An analysis of the US National Trauma Databank showed that the rate and timing of

Finally in answer to the third question, the lack of the population homogeneity is frequently evocated as a limit for these studies which aim to define the criteria in order to determine if

tracheotomy varied significantly across ICUs (Nathens et al., 2006).

The largest prospective randomized trial, comparing the most widely used percutaneous tracheotomy technique, was conducted by G.B. Fikkers (Fikkers et al., 2004, 2011). The author performed a meticulous observation of the procedures and follow-up. He involved in its study 120 patients, comparing the guide-wire dilating forceps (GWDF) and the single step dilatational tracheostomy (SSDT) technique, showing a trend toward less major perioperative complications with SSDT compared to GWDF technique. All procedures were conducted with bronchoscopic guidance, so that the optimal position of the cannula between the rings in the midline was always facilitated. However, more patients would be needed to detect smaller differences between the methods.

The rotating dilation (PercuTwist) and Griggs' forceps dilational tracheotomy methods were compared by Montcriol, in a recent prospective randomized study, involving 87 critical ill patients. The author found the PercuTwist significantly longer to perform than forceps dilational tracheotomy technique (five minutes vs three minutes), the complications were 20/87 (23%), and 18/20 were minor complications. He didn't found significant differences between the two groups of patients and concluded that the PercuTwist technique is safest, despite the longer duration of the procedure (Montcriol et al., 2011).

Since single dilator technique decrees operative time compared to the serial dilator technique, and without increasing the complication rates, the modified Ciaglia Blu Rhino technique is suggested as the technique of choice (level 2C, according to levels of evidence by American College of Chest Phisicians) (De Leyn, et al., 2007). Therefore, this is the only technique used in our centre, always under bronchoscopic guidance.

#### **5. Timing of the tracheotomy**

Overall, advances in clinical treatment and ICU practices are based on suitable mechanical ventilation. Many critical ill patients benefit from a prolonged ventilatory support program and subsequently from a meticulous weaning protocol from mechanical ventilation. In addition, the best clinical practice should always ensure patient comfort, safety, ability to communicate, clean oral and airway, as well as shorter days of mechanical ventilation, ICU and hospital stays. For these reasons tracheotomy is very beneficial, in fact with the now widespread use of the percutaneous technique with broncoscopic control, tracheotomy has become a very common practice in modern ICUs and in recent years, it has increased by nearly 200%. This raises the following three questions. The first is whether it is better to place early or late tracheotomy. The second is how to define "early" or "late tracheotomy". Finally, the third is the major methodological challenge, regarding how to define and predict the need for prolonged ventilation in different and specific groups of the patients.

For the first question, the best timing of tracheotomy has been a subject of debate and, still today, it has not found unanimous agreement. An analysis of a large database showed considerable variation in the timing and incidence of tracheotomy. In 1989 the consensus conference indicated that tracheotomy should be carried out after 3 weeks of endotracheal intubation (Plummer & Gracey 1989).

After, several studies have reported that tracheotomies which were performed earlier provided many benefits that include more rapid weaning from mechanical ventilation, shorter hospital length of stay (LOS), less complications from translaryngeal intubation,

The largest prospective randomized trial, comparing the most widely used percutaneous tracheotomy technique, was conducted by G.B. Fikkers (Fikkers et al., 2004, 2011). The author performed a meticulous observation of the procedures and follow-up. He involved in its study 120 patients, comparing the guide-wire dilating forceps (GWDF) and the single step dilatational tracheostomy (SSDT) technique, showing a trend toward less major perioperative complications with SSDT compared to GWDF technique. All procedures were conducted with bronchoscopic guidance, so that the optimal position of the cannula between the rings in the midline was always facilitated. However, more patients would be

The rotating dilation (PercuTwist) and Griggs' forceps dilational tracheotomy methods were compared by Montcriol, in a recent prospective randomized study, involving 87 critical ill patients. The author found the PercuTwist significantly longer to perform than forceps dilational tracheotomy technique (five minutes vs three minutes), the complications were 20/87 (23%), and 18/20 were minor complications. He didn't found significant differences between the two groups of patients and concluded that the PercuTwist technique is safest,

Since single dilator technique decrees operative time compared to the serial dilator technique, and without increasing the complication rates, the modified Ciaglia Blu Rhino technique is suggested as the technique of choice (level 2C, according to levels of evidence by American College of Chest Phisicians) (De Leyn, et al., 2007). Therefore, this is the only

Overall, advances in clinical treatment and ICU practices are based on suitable mechanical ventilation. Many critical ill patients benefit from a prolonged ventilatory support program and subsequently from a meticulous weaning protocol from mechanical ventilation. In addition, the best clinical practice should always ensure patient comfort, safety, ability to communicate, clean oral and airway, as well as shorter days of mechanical ventilation, ICU and hospital stays. For these reasons tracheotomy is very beneficial, in fact with the now widespread use of the percutaneous technique with broncoscopic control, tracheotomy has become a very common practice in modern ICUs and in recent years, it has increased by nearly 200%. This raises the following three questions. The first is whether it is better to place early or late tracheotomy. The second is how to define "early" or "late tracheotomy". Finally, the third is the major methodological challenge, regarding how to define and predict the need for prolonged ventilation in

For the first question, the best timing of tracheotomy has been a subject of debate and, still today, it has not found unanimous agreement. An analysis of a large database showed considerable variation in the timing and incidence of tracheotomy. In 1989 the consensus conference indicated that tracheotomy should be carried out after 3 weeks of endotracheal

After, several studies have reported that tracheotomies which were performed earlier provided many benefits that include more rapid weaning from mechanical ventilation, shorter hospital length of stay (LOS), less complications from translaryngeal intubation,

needed to detect smaller differences between the methods.

despite the longer duration of the procedure (Montcriol et al., 2011).

technique used in our centre, always under bronchoscopic guidance.

**5. Timing of the tracheotomy** 

different and specific groups of the patients.

intubation (Plummer & Gracey 1989).

better patient's comfort and safety, facilitating progression of care in and outside the ICU (Rumbak et al., 2004).

Yaseen Arabi et al., in a cohort study and review, analyzed 136 trauma ICU patients who required tracheotomies, confirmed all these benefits of early tracheotomy and moreover he found, with a multivariate analysis, that late tracheotomy was an independent predictor of prolonged ICU stay (Arabi et al., 2004).

However others studies, including the large multicenter TracMan (Tracheostomy management in critical care, 2011) trial have found no differences between early and late timing of the procedure.

In a large prospective trial, Trouillet et al., randomized patients who required prolonged mechanical ventilation after heart surgery, assigning to early tracheotomy (5 days after surgery) or prolonged intubation followed by tracheotomy 15 days after randomization. In this study early tracheotomy provided no benefits in term of mechanical ventilation duration, LOS, mortality rate, or frequency of infectious complications, but it was associated with a lower rate of agitation or delirium, with less sedative, analgesic and neuroleptic consumption and better patient comfort, fewer unscheduled estubation and re-intubation, earlier oral nutrition and bed-to chair transfer (Trouillet et al., 2009).

A systematic review, including randomized and non-randomized studies, has not been able to support the effects of tracheotomy on duration of mechanical ventilation in all patients (Griffiths et al., 2005). The effects of early tracheotomy on mechanical ventilation, VAP, hospital outcome and LOS, remaining hotly debated. Therefore, there is still no consensus about "early" or "late tracheotomy" definition, many clinicians use their own specific time window.

In 2001 Guidelines, created jointly by the American Association for Respiratory Care, the American College of Chest Physicians, and the American College of Critical Care Medicine, make no specific recommendations about tracheotomy timing, but suggest that the procedure should be considered if the patient will require prolonged ventilator assistance (De Leyn et al., 2007).

In 2005 surveys involving a large number of ICU from France and the United Kingdom documented variability for both the timing and the indications for tracheostomy (Blot & Melot 2005).

Contemporary the group of Rumbak in a prospective, randomized study, comparing early with late tracheotomy, he defined "early tracheotomy", if performed within 48 hours and "late tracheotomy" if performed at 2 weeks. The authors showed a decrease of mortality by 50% in first group (Rumbak et al., 2004).

The same authors in a 2007 study confirmed that early tracheotomy reduces time in the ICU, on mechanical ventilation, and in the hospital, whereas benefits regarding incidence of pneumonia and mortality are variable according to the different patient population ().

An analysis of the US National Trauma Databank showed that the rate and timing of tracheotomy varied significantly across ICUs (Nathens et al., 2006).

Finally in answer to the third question, the lack of the population homogeneity is frequently evocated as a limit for these studies which aim to define the criteria in order to determine if

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

threatening complications occur (Kost et al., 2005).

expense.

tracheotomy.

ICU (Carrer et al., 2009).

infection (Durbin Jr, 2005).

Finally it is an excellent tool for teaching PDT technique.

passage, pneumothorax and pneumomediastinum (Kost et al., 2005).

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 159

Initial needle placement in a midline, intercartilaginous position can be verified and corrected, as overpenetration of the lumen to the posterior tracheal wall. In a blind technique, tangential needle positioning is likely to go unrecognized, increasing risks of complications such as false

Using endoscopic vision, technical difficulties can be recognized and corrected before life-

Nevertheless, some limitations of bronchoscopic guidance are recognized. They include impairment of mechanical ventilation and oxygenation, in fact manual ventilation is recommended, then the need for additional personnel, and added procedural time and

During the procedure a potential increase in partial carbon dioxide tension and reduction in partial oxygen tension can raise intracranial pressure in susceptible patients (De Leyn et al., 2007). However, in many studies some authors confirms that percutaneous dilatational tracheotomy with endoscopy is a safe and acceptable alternative to open surgical

In recent years, the tracheotomy positioning has gained increased popularity as a resource

Several studies argue that early tracheotomy (within 7 days of mechanical ventilation) in ICU patients may help to reduce the duration of mechanical ventilation and length of stay in

The tracheostomy allows to reduce the duration of mechanical ventilation, because of improves secretions removal with suctioning, decreases resistance to breathing and dead space, betters patient comfort with less needed of sedation or analgesia, preserves the glottic competence reducing incidence of ventilatory-associated pneumonia (VAP) and others lung

Tracheostomy offers others advantages, it reduces the laryngeal injury as laryngeal stenosis and voice damage, reduces the oral injury, allows a better oral hygiene, improves the ability to communicate, preserves more the swallow with earlier oral feeding (Durbin Jr, 2005).

PDT is a cost-effective and safe alternative to surgical tracheostomy (ST) in critically ill patients in the ICU, and can be performed with very low morbidity by skilled and

The main advantage of PDT is the possibility to perform it at the bedside in the ICU, avoiding a potentially dangerous transport of critically ill patients to the operating room. It prevents the inconvenience of long waiting lists for operating room scheduling and significantly decreases the delay between the decision to perform tracheostomy and the

**7. Advantages of tracheotomy versus translaryngeal intubation** 

to facilitate the patients weaning from the mechanical ventilation.

**7.1 Potential advantages of PDT versus surgical tracheotomy** 

experienced practitioners (De Leyn, et al., 2007).

actual operation (De Leyn, et al., 2007).

a patient will require prolonged mechanical ventilation, and then identify the best timing to perform the tracheotomy. However, up to now, despite many efforts, no scoring system has been able to correctly identify patients for whom MV duration will be prolonged and, therefore, the early tracheotomy might be justified.

Especially after cardiac surgery, several studies have investigated factors associated with prolonged MV and many models have been developed in attempt to predict when the patients are designed to prolonged MV more than 48 hours.

Some authors in their studies refer alternatively to preoperative, intraoperative and immediately postoperative parameters, others showed that hemodynamic status on ICU admission and early postoperative events were more important than intraoperative variables, to predict ventilatory dependence, defined as MV greater than 72 hours after cardiac surgery (Cislaghi et al., 2009; Rajakaruna et al., 2005).

Trouillet, in is prospective observational study, considers, with a simple score, the clinical answer of the patient to the medical treatments during the first 3 days of the MV is more indicative of the prognosis than of any data gathered in a pre-operative or post-operative period. None of these models has been fully validated yet (Trouillet et al., 2011). However the message is to achieve a valid score to avoid a probably unnecessary invasive procedure, such as early tracheotomy in patients with a strong likelihood of rapid and successful MV weaning. Instead tracheotomy might be a right option in patients requiring longer MV and the highest safety may be achieved if it is performed with bronchoscopic guidance.

In our opinion, waiting further studies aimed to answer these important questions, for optimal management of critical ill patients, the decision regarding the best timing to perform tracheotomy depends on the physician, that should balance three problems: what is the patient expected recovery course, the risk of prolonged translaryngeal intubation and the risk of tracheotomy procedure.

#### **6. The bronchoscopic guidance features**

A problem with the PDT is the lack of visualization, therefore some studies suggested that the safety of the procedure may be enhanced by the use of ultrasound or bronchoscopic guidance (De Leyn et al., 2007; Kollig et al., 2000). However few randomized controlled trials have shown the utility of the bronchoscopic guidance during the percutaneous tracheotomy procedure.

In a clinical review, P. De Leyn et al, indicate in level 1C of the grading scheme classified recommendations, to perform any technique of PDT under bronchoscopic control. (De Leyn et al., 2007).

Over blind PDT, several goals are recognized by the video bronchoscopic guidance of puncture/dilatation process. Before initiating the procedure, the endoscopic survey can show any anatomic airway anomalies that may be encountered (Bobo et al., 1998).

During bronchoscopy proximal repositioning of the TE before introducing the guide-wire needle into the trachea can facilitate the procedure, and reduce the risk of the tube impalement; it shows the correct central area of the puncture and the appropriate tracheal rings with wound transillumination (Kost et al., 2005).

Initial needle placement in a midline, intercartilaginous position can be verified and corrected, as overpenetration of the lumen to the posterior tracheal wall. In a blind technique, tangential needle positioning is likely to go unrecognized, increasing risks of complications such as false passage, pneumothorax and pneumomediastinum (Kost et al., 2005).

Using endoscopic vision, technical difficulties can be recognized and corrected before lifethreatening complications occur (Kost et al., 2005).

Finally it is an excellent tool for teaching PDT technique.

158 Global Perspectives on Bronchoscopy

a patient will require prolonged mechanical ventilation, and then identify the best timing to perform the tracheotomy. However, up to now, despite many efforts, no scoring system has been able to correctly identify patients for whom MV duration will be prolonged and,

Especially after cardiac surgery, several studies have investigated factors associated with prolonged MV and many models have been developed in attempt to predict when the

Some authors in their studies refer alternatively to preoperative, intraoperative and immediately postoperative parameters, others showed that hemodynamic status on ICU admission and early postoperative events were more important than intraoperative variables, to predict ventilatory dependence, defined as MV greater than 72 hours after

Trouillet, in is prospective observational study, considers, with a simple score, the clinical answer of the patient to the medical treatments during the first 3 days of the MV is more indicative of the prognosis than of any data gathered in a pre-operative or post-operative period. None of these models has been fully validated yet (Trouillet et al., 2011). However the message is to achieve a valid score to avoid a probably unnecessary invasive procedure, such as early tracheotomy in patients with a strong likelihood of rapid and successful MV weaning. Instead tracheotomy might be a right option in patients requiring longer MV and

In our opinion, waiting further studies aimed to answer these important questions, for optimal management of critical ill patients, the decision regarding the best timing to perform tracheotomy depends on the physician, that should balance three problems: what is the patient expected recovery course, the risk of prolonged translaryngeal intubation and

A problem with the PDT is the lack of visualization, therefore some studies suggested that the safety of the procedure may be enhanced by the use of ultrasound or bronchoscopic guidance (De Leyn et al., 2007; Kollig et al., 2000). However few randomized controlled trials have shown the utility of the bronchoscopic guidance during the percutaneous

In a clinical review, P. De Leyn et al, indicate in level 1C of the grading scheme classified recommendations, to perform any technique of PDT under bronchoscopic control. (De Leyn

Over blind PDT, several goals are recognized by the video bronchoscopic guidance of puncture/dilatation process. Before initiating the procedure, the endoscopic survey can

During bronchoscopy proximal repositioning of the TE before introducing the guide-wire needle into the trachea can facilitate the procedure, and reduce the risk of the tube impalement; it shows the correct central area of the puncture and the appropriate tracheal

show any anatomic airway anomalies that may be encountered (Bobo et al., 1998).

the highest safety may be achieved if it is performed with bronchoscopic guidance.

therefore, the early tracheotomy might be justified.

patients are designed to prolonged MV more than 48 hours.

cardiac surgery (Cislaghi et al., 2009; Rajakaruna et al., 2005).

the risk of tracheotomy procedure.

tracheotomy procedure.

et al., 2007).

**6. The bronchoscopic guidance features** 

rings with wound transillumination (Kost et al., 2005).

Nevertheless, some limitations of bronchoscopic guidance are recognized. They include impairment of mechanical ventilation and oxygenation, in fact manual ventilation is recommended, then the need for additional personnel, and added procedural time and expense.

During the procedure a potential increase in partial carbon dioxide tension and reduction in partial oxygen tension can raise intracranial pressure in susceptible patients (De Leyn et al., 2007). However, in many studies some authors confirms that percutaneous dilatational tracheotomy with endoscopy is a safe and acceptable alternative to open surgical tracheotomy.

#### **7. Advantages of tracheotomy versus translaryngeal intubation**

In recent years, the tracheotomy positioning has gained increased popularity as a resource to facilitate the patients weaning from the mechanical ventilation.

Several studies argue that early tracheotomy (within 7 days of mechanical ventilation) in ICU patients may help to reduce the duration of mechanical ventilation and length of stay in ICU (Carrer et al., 2009).

The tracheostomy allows to reduce the duration of mechanical ventilation, because of improves secretions removal with suctioning, decreases resistance to breathing and dead space, betters patient comfort with less needed of sedation or analgesia, preserves the glottic competence reducing incidence of ventilatory-associated pneumonia (VAP) and others lung infection (Durbin Jr, 2005).

Tracheostomy offers others advantages, it reduces the laryngeal injury as laryngeal stenosis and voice damage, reduces the oral injury, allows a better oral hygiene, improves the ability to communicate, preserves more the swallow with earlier oral feeding (Durbin Jr, 2005).

#### **7.1 Potential advantages of PDT versus surgical tracheotomy**

PDT is a cost-effective and safe alternative to surgical tracheostomy (ST) in critically ill patients in the ICU, and can be performed with very low morbidity by skilled and experienced practitioners (De Leyn, et al., 2007).

The main advantage of PDT is the possibility to perform it at the bedside in the ICU, avoiding a potentially dangerous transport of critically ill patients to the operating room. It prevents the inconvenience of long waiting lists for operating room scheduling and significantly decreases the delay between the decision to perform tracheostomy and the actual operation (De Leyn, et al., 2007).

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

predispose to xerostomia, which contributes to poor oral hygiene.

**8. Complications of percutaneous dilational tracheotomy** 

Complications of tracheotomy can be divided into early and late incidences.

1998). With open tracheotomy this rate dramatically increases in 3 to 36% of cases.

tracheotomy must be considered (Schleder et al., 2002).

**8.1 Early complications** 

radiograph (De Leyn et al., 2007).

the tube, it must be replaced.

**8.2 Late complications** 

cases.

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 161

normal closure and reduces the risk related to aspiration of contaminated secretions from the orofaryngeal cavity; in a reduction in bacterial biofilm formation along the inside of the tracheotomy cannula, associated with regular changing of the tube, once or twice a week; finally in a shorter duration of mechanical ventilation due to facilitation of MV weaning (Nseir et al., 2007). Furthermore, the oral care is better in tracheotomised patients than in intubated ones: in fact, the endotracheal tube may obscure the view of the oral cavity and

So, since some hospitals propose oral care programs for the VAP prevention, the

Hemorrhage has been reported as the most common complication of PDT and occurs in 0 to 28.6% of cases. It is usually controlled by simply packing or suture ligation (Bobo et al.,

Another common complication is stoma infection: a tracheotomy is considered a cleancontaminated wound and for this reason antibiotic prophylaxis is necessary. Instead this infection is quite uncommon with PDT, occurring in up to 4% of cases (Bobo et al., 1998) while with the surgical tracheotomy the rates are higher generally occurring in 17 to 36% of

Subcutaneous or mediastinal emphysema is another additional complication when subcutaneous emphysema can be caused by positive pressure ventilation or by cough against a tightly sutured or packed wound. The emphysema disappears spontaneously within a few days. Instead mediastinal emphysema is very uncommon and occurs in very few cases as pneumothorax which is caused by a false passage and is evidenced by chest

A further complication is a tube displacement, caused either by inadequate securement of the tube around the neck or rapid cervical swelling. After the reinsertion of the tube, a false channel in the subcutaneous tissue anterior to the tracheal ostium may compress the trachea and cause an emergency. Then orotracheal intubation is needed when the tract cannot be restored immediately (De Leyn et al., 2007; Heffner et al., 1986). Finally, tube obstruction which can be caused by mucus or blood clots even displacement. If it is not possible to clean

One of the most common complications of tracheotomy is pulmonary infections mainly for pneumonia. A large proportion of ventilatory-associated pneumonia (VAP) develops within the first week after tracheotomy. The most common pathogens isolated are Pseudomonas aeruginosa and Gram-negative enteric bacteria that colonize the tracheobronchial tree in patients with long-term tracheotomy. The colonization of the airways depends on the severity of the disease, nutritional status of the patient and depression of mucociliary

In a retrospective analysis performed on clinical and financial outcomes, PDT resulted associated to less costs compared to surgical tracheostomy (Bacchetta et al., 2005).

This is predominantly a result of avoiding operating room charges (De Leyn et al., 2007).

In general, PDT appears to be a less traumatic and minimally invasive procedure than ST. In fact the incision in PDT is very small, the tracheotomy tube is fitted tightly against the stoma, and less dissection, tissue trauma and devitalisation occur; furthermore cartilage rings usually remain more or less intact during PDT, while most surgeons incise one or more tracheal cartilage rings during ST.

These advantages are probably responsible for the favorable outcomes, fewer overall postoperative complications described in short-term and long-term follow-up studies of patients undergoing PDT (Nieszkowska et al., 2005; Sue & Susanto 2003), including less postoperative and perioperative bleeding, fewer wound infection and subglottic stenosis and an aesthetically more favorable scar (Grillo, 2004).

#### **7.2 Tracheotomy and lung infections**

A potential, important benefit, without agreement in literature yet, attributed to tracheotomy, especially when it is provided at an early stage, is a lower ventilator-associated pneumonia (VAP) rate (Nseir et al., 2007; Rodriguez et al., 1990; Rumbak et al., 2004).

Micro-aspiration of oral secretions past the tube cuff can contribute to the development of pneumonia. In addition, dental plaques, the oropharyngeal cavity and the stomach are potential reservoirs for microorganisms in critically ill patients requiring mechanical ventilation through an endotracheal tube or a tracheotomy cannula (El-Solh, 2004; Frost & Wise, 2008). The most important underlying mechanism for the onset of VAP is the aspiration of oropharyngeal microorganisms into the distal bronchi, followed by bacterial proliferation and parenchymal invasion, leading to bronchopneumonia (El-Solh, 2004). The presence of an endotracheal tube and the aspiration of oropharyngeal contents, containing a large bacterial inoculum can overcome the host defenses that are already compromised by the critical illness and lead to the development of VAP (Frost & Wise, 2008; Kollef, 1999).

Some studies indicate an increased incidence in lower respiratory-tract infections following tracheotomy. However no adjustment was performed for the duration of the MV, which is probably the most important risk factor for VAP.

In a large, randomized controlled trial of patients who require prolonged mechanical ventilation after cardiac surgery, Trouillet et al. showed that early tracheotomy did not modify the frequency of VAP during the first 60 days after randomization between early percutaneous tracheotomy and prolonged intubation groups possibly followed by late tracheotomy (Trouillet et al., 2011).

Other authors found tracheotomy protective against VAP using matching for several confounding factors, including duration of MV.

Considering the patophysiology of VAP in intubated patients, Nseir demonstrated in a retrospective case-control study, that tracheotomy was independently associated with a decreased risk of VAP compared to patients with translaryngeal intubation. The potential reasons include: liberation of the vocal cords in tracheotomised patients, that results in normal closure and reduces the risk related to aspiration of contaminated secretions from the orofaryngeal cavity; in a reduction in bacterial biofilm formation along the inside of the tracheotomy cannula, associated with regular changing of the tube, once or twice a week; finally in a shorter duration of mechanical ventilation due to facilitation of MV weaning (Nseir et al., 2007). Furthermore, the oral care is better in tracheotomised patients than in intubated ones: in fact, the endotracheal tube may obscure the view of the oral cavity and predispose to xerostomia, which contributes to poor oral hygiene.

So, since some hospitals propose oral care programs for the VAP prevention, the tracheotomy must be considered (Schleder et al., 2002).

#### **8. Complications of percutaneous dilational tracheotomy**

Complications of tracheotomy can be divided into early and late incidences.

#### **8.1 Early complications**

160 Global Perspectives on Bronchoscopy

In a retrospective analysis performed on clinical and financial outcomes, PDT resulted

In general, PDT appears to be a less traumatic and minimally invasive procedure than ST. In fact the incision in PDT is very small, the tracheotomy tube is fitted tightly against the stoma, and less dissection, tissue trauma and devitalisation occur; furthermore cartilage rings usually remain more or less intact during PDT, while most surgeons incise one or

These advantages are probably responsible for the favorable outcomes, fewer overall postoperative complications described in short-term and long-term follow-up studies of patients undergoing PDT (Nieszkowska et al., 2005; Sue & Susanto 2003), including less postoperative and perioperative bleeding, fewer wound infection and subglottic stenosis

A potential, important benefit, without agreement in literature yet, attributed to tracheotomy, especially when it is provided at an early stage, is a lower ventilator-associated pneumonia (VAP) rate (Nseir et al., 2007; Rodriguez et al., 1990; Rumbak et al., 2004).

Micro-aspiration of oral secretions past the tube cuff can contribute to the development of pneumonia. In addition, dental plaques, the oropharyngeal cavity and the stomach are potential reservoirs for microorganisms in critically ill patients requiring mechanical ventilation through an endotracheal tube or a tracheotomy cannula (El-Solh, 2004; Frost & Wise, 2008). The most important underlying mechanism for the onset of VAP is the aspiration of oropharyngeal microorganisms into the distal bronchi, followed by bacterial proliferation and parenchymal invasion, leading to bronchopneumonia (El-Solh, 2004). The presence of an endotracheal tube and the aspiration of oropharyngeal contents, containing a large bacterial inoculum can overcome the host defenses that are already compromised by the critical illness and lead to the development of VAP (Frost & Wise, 2008; Kollef, 1999).

Some studies indicate an increased incidence in lower respiratory-tract infections following tracheotomy. However no adjustment was performed for the duration of the MV, which is

In a large, randomized controlled trial of patients who require prolonged mechanical ventilation after cardiac surgery, Trouillet et al. showed that early tracheotomy did not modify the frequency of VAP during the first 60 days after randomization between early percutaneous tracheotomy and prolonged intubation groups possibly followed by late

Other authors found tracheotomy protective against VAP using matching for several

Considering the patophysiology of VAP in intubated patients, Nseir demonstrated in a retrospective case-control study, that tracheotomy was independently associated with a decreased risk of VAP compared to patients with translaryngeal intubation. The potential reasons include: liberation of the vocal cords in tracheotomised patients, that results in

This is predominantly a result of avoiding operating room charges (De Leyn et al., 2007).

associated to less costs compared to surgical tracheostomy (Bacchetta et al., 2005).

more tracheal cartilage rings during ST.

**7.2 Tracheotomy and lung infections** 

and an aesthetically more favorable scar (Grillo, 2004).

probably the most important risk factor for VAP.

confounding factors, including duration of MV.

tracheotomy (Trouillet et al., 2011).

Hemorrhage has been reported as the most common complication of PDT and occurs in 0 to 28.6% of cases. It is usually controlled by simply packing or suture ligation (Bobo et al., 1998). With open tracheotomy this rate dramatically increases in 3 to 36% of cases.

Another common complication is stoma infection: a tracheotomy is considered a cleancontaminated wound and for this reason antibiotic prophylaxis is necessary. Instead this infection is quite uncommon with PDT, occurring in up to 4% of cases (Bobo et al., 1998) while with the surgical tracheotomy the rates are higher generally occurring in 17 to 36% of cases.

Subcutaneous or mediastinal emphysema is another additional complication when subcutaneous emphysema can be caused by positive pressure ventilation or by cough against a tightly sutured or packed wound. The emphysema disappears spontaneously within a few days. Instead mediastinal emphysema is very uncommon and occurs in very few cases as pneumothorax which is caused by a false passage and is evidenced by chest radiograph (De Leyn et al., 2007).

A further complication is a tube displacement, caused either by inadequate securement of the tube around the neck or rapid cervical swelling. After the reinsertion of the tube, a false channel in the subcutaneous tissue anterior to the tracheal ostium may compress the trachea and cause an emergency. Then orotracheal intubation is needed when the tract cannot be restored immediately (De Leyn et al., 2007; Heffner et al., 1986). Finally, tube obstruction which can be caused by mucus or blood clots even displacement. If it is not possible to clean the tube, it must be replaced.

#### **8.2 Late complications**

One of the most common complications of tracheotomy is pulmonary infections mainly for pneumonia. A large proportion of ventilatory-associated pneumonia (VAP) develops within the first week after tracheotomy. The most common pathogens isolated are Pseudomonas aeruginosa and Gram-negative enteric bacteria that colonize the tracheobronchial tree in patients with long-term tracheotomy. The colonization of the airways depends on the severity of the disease, nutritional status of the patient and depression of mucociliary

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

medical and surgical patients, are admitted to this CTICU.

retrospectively evaluated.

(patients transferred or died).

**9.3 Technique** 

**10. Results 10.1 Patients** 

Gender

Department of origin

**9.2 Study design and data collection** 

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 163

emergencies. Any patients undergoing heart and thoracic surgery, and occasionally other

Between 2006 and 2010, 184 patients required PMV (≥ 4 days), among these, 134 patients underwent percutaneous dilatational tracheotomy (PDT) with endoscopic guidance were

For all patients studied, the following data was retrospectively collected from ICU database: age, sex, origin (other ICU or hospital ward), SAPS II (Simplified Acute Physiology Score), reason for and diagnosis at ICU admission, mode of surgery (elective, urgent, emergent), duration of mechanical ventilation, re-intubation, timing of tracheotomy, complications of tracheotomy including pneumonia or other lung infections, ICU stay duration and outcome

The patients enrolled in the study were those who required tracheotomy due to failure to be weaned from mechanical ventilation. The physicians in the department established the timing of tracheotomy. All tracheotomies were conducted at the patient bedside by experienced physicians in the ICU using the Ciaglia percutaneous technique (Ciaglia Blue Rhino, Cook Critical Care, Bloomington, Illinois) described before, in the technique section.

Among the 3648 consecutive patients admitted in the CTICU from January 2006 to December 2010, a total of 184 were still intubated 4 or more days after CTICU admission.

Table 1 shows the preoperative and surgical characteristics, including the demographic,

Characteristics Value\*

Other medical or surgical wards 12 (8.9)

n = 134

Male 94 (70.1) Female 40 (29.9)

Cardiac surgery 82 (61.2) Thoracic surgery 15 (11.2) Coronary care unit 14 (10.4)

Therefore, a tracheotomy was performed on 134 patients of these patients.

Age, years 69.8 ± 9.2

descriptive data of the patients and their department of origin.

clereance caused by tracheotomy. In this cases it is advisable to consider a periprocedural antibiotic prophylaxis (De Leyn et al., 2007; Heffner et al., 1986; Rello et al., 2003).

Tracheal stenosis occurs in 1 to 2% of cases and can affect the tracheal stoma differently, the cuff or the tip of the tracheotomy tube. This complication result from ischemic damage to the tracheal mucosa when the high-pressure cuff are used and the tracheal wall tension exceeds mucosal capillary perfusion pressure for significant periods of time. Within 15 minutes of a continuous tracheal wall pressure above 50 mmHg, destruction of columnar epithelium happens. Inflammatory histologic changes result within 24 to 48 hours with superficial tracheitis and mucosal ulcerations appearing after several days. If persists inflammation, chondritis develops with deterioration of cartilaginous support within two to three weeks. The granulation and fibrosis that appear during recovery, produce the tracheal stenosis. Clinical manifestations of tracheal stenosis after tracheotomy include dyspnea on effort, cough and difficult to remove secretions. The symptoms appear when there is a 75% of reduction in tracheal lumen diameter. The treatment of tracheal stenosis consists in surgical trachea resection or tracheal dilatation.

On the other hand, tracheo-innominate artery fistula is quite uncommon (<0.7%) and can be determined by high direct pressure of the cannula against the innominate artery or by a too low placed tracheotomy tube that erode directly into the artery, because the innominate artery crosses the anterolateral surface of the trachea at the level of the upper sternum. The result is airway bleeding in which a possible sudden massive hemmorhage can cause a lifethreatening condition. The overall survival rate of this complication is 25%. Therefore in order to prevent such incidences, thacheotomy should be performed at the second or third cartilaginous ring and should avoid prolonged or excessive hyperextension of the neck, using a re-adjustable tracheotomy tube (De Leyn et al., 2007; Heffner et al., 1986). Tracheoesophageal fistula is another complication which occurs in less than 1% of cases. Early onset results from poor surgical techniques with the incision of the posterior tracheal wall. Late onset results from tracheal necrosis caused by excessive cuff pressure. The patient presents excessive secretions, food aspiration and leaking around the cuff with abdominal distension, the respiratory parameters can worsen in such cases. Tracheoscopy or esophagography can be used for the diagnosis. The treatment consists in a cervical incision when the patient is clinically stable (De Leyn et al., 2007; Heffner et al., 1986).

Swallowing difficulties are caused by decreased laryngeal elevation, esophageal compression and obstruction from the tracheotomy tube cuff concur resulting in swallowing difficulties (De Leyn et al., 2007).

Granuloma may result from a foreign body reaction to the tracheotomy tube (De Leyn et al., 2007).

Finally, persistent stoma can result from epithelialisation between the skin and the tracheal mucosa when the tube is in place for a prolonged period (De Leyn et al., 2007).

#### **9. Materials and methods**

#### **9.1 Study location and patient population**

This study was conducted in the CTICU of the Civil Hospital, Brescia, Italy, and a 2400-bed, university-affiliated teaching hospital. This CTICU has 6 beds available, including 1 for emergencies. Any patients undergoing heart and thoracic surgery, and occasionally other medical and surgical patients, are admitted to this CTICU.

Between 2006 and 2010, 184 patients required PMV (≥ 4 days), among these, 134 patients underwent percutaneous dilatational tracheotomy (PDT) with endoscopic guidance were retrospectively evaluated.

#### **9.2 Study design and data collection**

For all patients studied, the following data was retrospectively collected from ICU database: age, sex, origin (other ICU or hospital ward), SAPS II (Simplified Acute Physiology Score), reason for and diagnosis at ICU admission, mode of surgery (elective, urgent, emergent), duration of mechanical ventilation, re-intubation, timing of tracheotomy, complications of tracheotomy including pneumonia or other lung infections, ICU stay duration and outcome (patients transferred or died).

#### **9.3 Technique**

162 Global Perspectives on Bronchoscopy

clereance caused by tracheotomy. In this cases it is advisable to consider a periprocedural

Tracheal stenosis occurs in 1 to 2% of cases and can affect the tracheal stoma differently, the cuff or the tip of the tracheotomy tube. This complication result from ischemic damage to the tracheal mucosa when the high-pressure cuff are used and the tracheal wall tension exceeds mucosal capillary perfusion pressure for significant periods of time. Within 15 minutes of a continuous tracheal wall pressure above 50 mmHg, destruction of columnar epithelium happens. Inflammatory histologic changes result within 24 to 48 hours with superficial tracheitis and mucosal ulcerations appearing after several days. If persists inflammation, chondritis develops with deterioration of cartilaginous support within two to three weeks. The granulation and fibrosis that appear during recovery, produce the tracheal stenosis. Clinical manifestations of tracheal stenosis after tracheotomy include dyspnea on effort, cough and difficult to remove secretions. The symptoms appear when there is a 75% of reduction in tracheal lumen diameter. The treatment of tracheal stenosis consists in

On the other hand, tracheo-innominate artery fistula is quite uncommon (<0.7%) and can be determined by high direct pressure of the cannula against the innominate artery or by a too low placed tracheotomy tube that erode directly into the artery, because the innominate artery crosses the anterolateral surface of the trachea at the level of the upper sternum. The result is airway bleeding in which a possible sudden massive hemmorhage can cause a lifethreatening condition. The overall survival rate of this complication is 25%. Therefore in order to prevent such incidences, thacheotomy should be performed at the second or third cartilaginous ring and should avoid prolonged or excessive hyperextension of the neck, using a re-adjustable tracheotomy tube (De Leyn et al., 2007; Heffner et al., 1986). Tracheoesophageal fistula is another complication which occurs in less than 1% of cases. Early onset results from poor surgical techniques with the incision of the posterior tracheal wall. Late onset results from tracheal necrosis caused by excessive cuff pressure. The patient presents excessive secretions, food aspiration and leaking around the cuff with abdominal distension, the respiratory parameters can worsen in such cases. Tracheoscopy or esophagography can be used for the diagnosis. The treatment consists in a cervical incision when the patient is

Swallowing difficulties are caused by decreased laryngeal elevation, esophageal compression and obstruction from the tracheotomy tube cuff concur resulting in swallowing

Granuloma may result from a foreign body reaction to the tracheotomy tube (De Leyn et al.,

Finally, persistent stoma can result from epithelialisation between the skin and the tracheal

This study was conducted in the CTICU of the Civil Hospital, Brescia, Italy, and a 2400-bed, university-affiliated teaching hospital. This CTICU has 6 beds available, including 1 for

mucosa when the tube is in place for a prolonged period (De Leyn et al., 2007).

antibiotic prophylaxis (De Leyn et al., 2007; Heffner et al., 1986; Rello et al., 2003).

surgical trachea resection or tracheal dilatation.

clinically stable (De Leyn et al., 2007; Heffner et al., 1986).

difficulties (De Leyn et al., 2007).

**9. Materials and methods** 

**9.1 Study location and patient population** 

2007).

The patients enrolled in the study were those who required tracheotomy due to failure to be weaned from mechanical ventilation. The physicians in the department established the timing of tracheotomy. All tracheotomies were conducted at the patient bedside by experienced physicians in the ICU using the Ciaglia percutaneous technique (Ciaglia Blue Rhino, Cook Critical Care, Bloomington, Illinois) described before, in the technique section.

#### **10. Results**

#### **10.1 Patients**

Among the 3648 consecutive patients admitted in the CTICU from January 2006 to December 2010, a total of 184 were still intubated 4 or more days after CTICU admission. Therefore, a tracheotomy was performed on 134 patients of these patients.

Table 1 shows the preoperative and surgical characteristics, including the demographic, descriptive data of the patients and their department of origin.


Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

**10.2 Mechanical ventilation and tracheotomy** 

Seventy patients (52.2%) were re-intubated.

\* Values are expressed as means ± SD or n (%).

intubation (Table 2).

Tracheotomy

recorded.

respiratory failure.

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 165

The twenty-one medical patients (15.7%) admitted to the ICU suffered from heart and/or

The mean ± SD duration of mechanical ventilation was 17.8 ± 12.2 days (Fig. 2).

Fig. 2. Length of mechanical ventilation through endotracheal tube or tracheotomy.

During of ventilation, days 17.8 ± 12.2 Patients undergoing reintubation 70 (52.2) Timing of tracheotomy, days 4.7 ± 2.5

Table 2. Ventilation Data for 134 Patients Who Underwent Percutaneous Dilatational

Any major side effect or technical problem that occurred during the procedure was

The patients received a tracheotomy after a mean ± SD of 4.7 ± 2.5 days of endotracheal

Value\*


CTICU, Cardiothoracic Intensive Care Unit; PDT, percutaneous dilational tracheotomy \* Values are expressed as means ± SD or n (%).

Table 1. Characteristics of 134 study CTICU admitted patients requiring PDT.

Of the 134 patients, 94 (70.1%) were male, and the mean age ± SD was 69.8 ± 9.2 years (range: 32-85 years).

The mean ± SD SAPS II score on admission was 46.2 ± 20.3.

The mean ± SD length of stay in the ICU was 20.8 ± 13.5 days (Fig. 1).

Fig. 1. ICU length of stay of patients received percutaneous dilational tracheotomy (PDT).

Of the 134 patients studied, 113 (84.3%) were surgical; of these, 39 (34.5%) underwent a valve replacement, 17 (15.0%) a coronary artery bypass graft (CABG), 22 (19.5%) a CABG with valve replacement, 16 (14.1%) an aortic surgery (ascending aortic surgery, aortic arch surgery, descending thoracic surgery), 12 (10.6%) a pulmonary resection for neoplasm, and 7 (6.2%) a surgery for miscellaneous conditions. Surgical intervention was performed in election in 92 (81.4%) cases, was urgent in 21 (18.6%) cases.

The twenty-one medical patients (15.7%) admitted to the ICU suffered from heart and/or respiratory failure.

#### **10.2 Mechanical ventilation and tracheotomy**

164 Global Perspectives on Bronchoscopy

SAPS II 46.2 ± 20.3 Length of stay in CTICU 20.8 ± 13.5 Overall mortality 65 (48.5) CTICU, Cardiothoracic Intensive Care Unit; PDT, percutaneous dilational tracheotomy

Table 1. Characteristics of 134 study CTICU admitted patients requiring PDT.

The mean ± SD SAPS II score on admission was 46.2 ± 20.3.

election in 92 (81.4%) cases, was urgent in 21 (18.6%) cases.

The mean ± SD length of stay in the ICU was 20.8 ± 13.5 days (Fig. 1).

Of the 134 patients, 94 (70.1%) were male, and the mean age ± SD was 69.8 ± 9.2 years

Fig. 1. ICU length of stay of patients received percutaneous dilational tracheotomy (PDT).

Of the 134 patients studied, 113 (84.3%) were surgical; of these, 39 (34.5%) underwent a valve replacement, 17 (15.0%) a coronary artery bypass graft (CABG), 22 (19.5%) a CABG with valve replacement, 16 (14.1%) an aortic surgery (ascending aortic surgery, aortic arch surgery, descending thoracic surgery), 12 (10.6%) a pulmonary resection for neoplasm, and 7 (6.2%) a surgery for miscellaneous conditions. Surgical intervention was performed in

\* Values are expressed as means ± SD or n (%).

(range: 32-85 years).

Characteristics Value\*

Emergency rooms 9 (6.7) Other ICU wards 2 (1.5)

n = 134

The mean ± SD duration of mechanical ventilation was 17.8 ± 12.2 days (Fig. 2).

Fig. 2. Length of mechanical ventilation through endotracheal tube or tracheotomy.

Seventy patients (52.2%) were re-intubated.

The patients received a tracheotomy after a mean ± SD of 4.7 ± 2.5 days of endotracheal intubation (Table 2).


\* Values are expressed as means ± SD or n (%).

Table 2. Ventilation Data for 134 Patients Who Underwent Percutaneous Dilatational Tracheotomy

Any major side effect or technical problem that occurred during the procedure was recorded.

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

management and the outcome of our patients.

has been so far validated.

mortality with "early" tracheotomy.

facility (SNF), also with ventilator support.

shorten ICU length of stay reduces health care costs.

"late" tracheotomy.

non-ICU environment.

to wean from ventilator support.

2004).

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 167

As in most studies, our data showed a low rate of PMV in CTICU patients. Among 3648 admitted in our unit, over the past five years, 194 (5.3%) required PMV, of these 134 (69%)

We don't have data that could explain the reasons of PMV, why was not this the aim of the present study, therefore it will soon the object of the future work, to improve the

It would be very important to find a score able to identify patients requiring PMV and consequently the best timing to perform tracheotomy. Many scores are developed, but due to their stiffness, poorly adapted to heterogeneous groups of admitted in ICU, none of these

It is not shown in current literature yet, which is the right time when the tracheotomy must be performed, there is not even agreement regarding the exact definition of "early" and

Most well designed studies, focused on timing of tracheotomy, comparing tracheotomised with translaryngeal ventilator patients, showed a statistically significant reduction in

Rumbak et al., defined "early" (within 2 days from the MV) and "late" (days 14-16) tracheotomy, they compared the two methods and they showed a statistically significant reduction in mortality with early tracheotomy (31.7% vs 61.7% respectively) (Rumbak et al.,

Driven by the need to not hinder the operating list and to optimize the resources, we performed tracheotomies after a mean ± SD of 4.7 ± 2.5 days from the beginning of the MV (Fig. 3), once a tracheostomy is in place, then we transferred patients to a skilled nursing

Of all surviving, 69 (51.5%) were transferred to others departments at days 2 or 3 after tracheotomy, of these 42 (60.8%) requiring prolonged ventilation support, they were wean in

This appears rational and cost/effective, because if the tube is dislodged, no special equipment or skills are needed to replace it; after the stomal tract has matured, usually within 3–7 days, the tube can be easily reinserted without difficulty. The SNF are often able

Earlier transition of a patient from the ICU remains a major advantage of tracheostomy. To

The complication rates reported in most previously published large studies and metaanalyses ranging from 8.9 to 30%. They include severe complications in 1.5% of all cases and less dangerous complications that amounted to 6.5% (Bause et al., 1999). The most frequently complications related to the procedure concern malpositioning, tracheal stenosis, stomal infections, bleeding (rate of 3.2%) with transfusion requirements, respiratory failure

In this study, no serious side effects both during and after the procedure have occurred.

(pneumothorax, pneumomediastinum) or need to change ventilator settings.

were underwent to PDT. Seventy PDT were performed to re-intubated patients.

We assessed four minor complications: two episodes of tracheal rings fracture having no significant, and two minor stomal bleeding without transfusion requirements.

#### **10.3 Pneumonia and other airway infections**

Of the 134 patients, the cumulative incidence of VAP was 40.3% (n=54) and 19.4% of other airway infections (n=26).

#### **10.4 Mortality and outcome**

Overall, 65 patients (48.5%) died, while 69 patients (51.5%) who survived were transferred at day 2 or 3 after the tracheotomy to other departments, 42 (60.8%) requiring prolonged ventilation support, were weaned in a non-ICU department.

#### **11. Conclusion**

PDT is described as a safe technique, easier to perform with fewer overall postoperative complications, such as less pre and postoperative bleeding and fewer postoperative stomal infections than surgical tracheotomy (ST).

PDT is a procedure in rapidly evolving state regarding its technology and the number of the technique available. The safety of the procedure may be enhanced by the use of bronchoscopic guidance. The Tracheotomy Endoscope is just designed to prevent serious complications in dilational tracheotomies and facilitate their management, so that patients with tracheotomy, can be moved in SNF, even if ventilator support is necessary. It is also interesting that the method is very easy to learn.

The major indication of the PDT is prolonged mechanical ventilation (PMV), there are evidences supporting that PDT reduces work of breathing, facilitates the weaning and reduces length of MV.

Although there isn't agreement in literature about the PMV definition, many authors, so that in present study, judge "prolonged" the mechanical ventilation lasting for more than 96 hours, both continuously or after re-intubation.

Several authors showed that in medical ICU, PVM is a widely treatment that induces longer hospitalization and high costs. In CTICU, where it occurs in 2.6 to 22.7% according to various authors, is also associated with increased patient morbidity and mortality (range, 4.9–38%), its cost instead of 12% of the total.

Early weaning from MV, within 8–12 hours after open heart surgery, being associated with better cardiac function, and with a decrease in respiratory and infectious complications, should be the gold standard in the CTICU.

Continuously PMV begins necessary in selected, high-risk cardiac surgery patients, normally identified preoperatively, or recognized in the immediate postoperative.

Sometimes, in a not insignificant number of the patients without evident risk factors, activation of the inflammatory cascade due to the cardiopulmonary bypass (CPB), can be responsible for failing of the early extubation, making it necessary for re-intubation, and then for PMV.

We assessed four minor complications: two episodes of tracheal rings fracture having no

Of the 134 patients, the cumulative incidence of VAP was 40.3% (n=54) and 19.4% of other

Overall, 65 patients (48.5%) died, while 69 patients (51.5%) who survived were transferred at day 2 or 3 after the tracheotomy to other departments, 42 (60.8%) requiring prolonged

PDT is described as a safe technique, easier to perform with fewer overall postoperative complications, such as less pre and postoperative bleeding and fewer postoperative stomal

PDT is a procedure in rapidly evolving state regarding its technology and the number of the technique available. The safety of the procedure may be enhanced by the use of bronchoscopic guidance. The Tracheotomy Endoscope is just designed to prevent serious complications in dilational tracheotomies and facilitate their management, so that patients with tracheotomy, can be moved in SNF, even if ventilator support is necessary. It is also

The major indication of the PDT is prolonged mechanical ventilation (PMV), there are evidences supporting that PDT reduces work of breathing, facilitates the weaning and

Although there isn't agreement in literature about the PMV definition, many authors, so that in present study, judge "prolonged" the mechanical ventilation lasting for more than 96

Several authors showed that in medical ICU, PVM is a widely treatment that induces longer hospitalization and high costs. In CTICU, where it occurs in 2.6 to 22.7% according to various authors, is also associated with increased patient morbidity and mortality (range,

Early weaning from MV, within 8–12 hours after open heart surgery, being associated with better cardiac function, and with a decrease in respiratory and infectious complications,

Continuously PMV begins necessary in selected, high-risk cardiac surgery patients,

Sometimes, in a not insignificant number of the patients without evident risk factors, activation of the inflammatory cascade due to the cardiopulmonary bypass (CPB), can be responsible for failing of the early extubation, making it necessary for re-intubation, and

normally identified preoperatively, or recognized in the immediate postoperative.

significant, and two minor stomal bleeding without transfusion requirements.

**10.3 Pneumonia and other airway infections** 

infections than surgical tracheotomy (ST).

interesting that the method is very easy to learn.

hours, both continuously or after re-intubation.

4.9–38%), its cost instead of 12% of the total.

should be the gold standard in the CTICU.

ventilation support, were weaned in a non-ICU department.

airway infections (n=26).

**11. Conclusion** 

reduces length of MV.

then for PMV.

**10.4 Mortality and outcome** 

As in most studies, our data showed a low rate of PMV in CTICU patients. Among 3648 admitted in our unit, over the past five years, 194 (5.3%) required PMV, of these 134 (69%) were underwent to PDT. Seventy PDT were performed to re-intubated patients.

We don't have data that could explain the reasons of PMV, why was not this the aim of the present study, therefore it will soon the object of the future work, to improve the management and the outcome of our patients.

It would be very important to find a score able to identify patients requiring PMV and consequently the best timing to perform tracheotomy. Many scores are developed, but due to their stiffness, poorly adapted to heterogeneous groups of admitted in ICU, none of these has been so far validated.

It is not shown in current literature yet, which is the right time when the tracheotomy must be performed, there is not even agreement regarding the exact definition of "early" and "late" tracheotomy.

Most well designed studies, focused on timing of tracheotomy, comparing tracheotomised with translaryngeal ventilator patients, showed a statistically significant reduction in mortality with "early" tracheotomy.

Rumbak et al., defined "early" (within 2 days from the MV) and "late" (days 14-16) tracheotomy, they compared the two methods and they showed a statistically significant reduction in mortality with early tracheotomy (31.7% vs 61.7% respectively) (Rumbak et al., 2004).

Driven by the need to not hinder the operating list and to optimize the resources, we performed tracheotomies after a mean ± SD of 4.7 ± 2.5 days from the beginning of the MV (Fig. 3), once a tracheostomy is in place, then we transferred patients to a skilled nursing facility (SNF), also with ventilator support.

Of all surviving, 69 (51.5%) were transferred to others departments at days 2 or 3 after tracheotomy, of these 42 (60.8%) requiring prolonged ventilation support, they were wean in non-ICU environment.

This appears rational and cost/effective, because if the tube is dislodged, no special equipment or skills are needed to replace it; after the stomal tract has matured, usually within 3–7 days, the tube can be easily reinserted without difficulty. The SNF are often able to wean from ventilator support.

Earlier transition of a patient from the ICU remains a major advantage of tracheostomy. To shorten ICU length of stay reduces health care costs.

The complication rates reported in most previously published large studies and metaanalyses ranging from 8.9 to 30%. They include severe complications in 1.5% of all cases and less dangerous complications that amounted to 6.5% (Bause et al., 1999). The most frequently complications related to the procedure concern malpositioning, tracheal stenosis, stomal infections, bleeding (rate of 3.2%) with transfusion requirements, respiratory failure (pneumothorax, pneumomediastinum) or need to change ventilator settings.

In this study, no serious side effects both during and after the procedure have occurred.

Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

with substantially longer inpatient, ICU stay and higher cost.

data are widely discussed.

ICU expenses reduced.

to optimize healthcare resources.

healthcare recourses.

**12. References** 

Mechanical Ventilated Patients Admitted in Cardio-Thoracic Intensive Care Unit 169

Kollef in a prospective cohort study, describe outcomes of patients with respiratory failure in PMV, receiving a tracheostomy. They found the overall hospital mortality for patients receiving a tracheostomy (13.7%) was significantly less than the overall hospital mortality for patients with translaryngeal intubation (26.4%) (Kollef, 1999). Any reasons to explain this

Combining advances in technology and treatments with control healthcare costs, suggest that the effectiveness of patient care could be maintained or improved, and in meantime

The features of the cardiac surgery patients are changing, many of these suffering of multiple co morbidities. Concurrent with these changes, the needs for critical care service are increasing. Needham et al. estimated that the number of ICU patients who require MV will increase by 31% from 2000 to 2026 (Needham et al., 2005). PMV is commonly associated

In our experience PDT with broncoscopic guidance, that guarantees very low complications, must be considered as a best practice, aimed to reduce length of ICU and hospital stay, and

Although we recognize some methodological limits in our study. First of all, it is an observational study and is not able to give strong messages. Missing data regard: the reasons of the failed early extubation in CTICU patients; the follow-up of the patients weaned from ventilator support in SNF, though there has always been a collaborative job between the CTICU and the SNF physicians. Current study also suggests to deepen the knowledge regarding both the incidence of VAP in patients with tracheotomy, performed with broncoscopic guidance and the real contribution of the early PDT to optimize

Al-Ansari, M.A. & Hijazi, M.H. (2005). Clinical review: Percutaneous dilatational

Ambesh, S.P.; Pandey, C.K.; Srivastava, S.; Agarwal, A. & Singh D.K. (2002). Percutaneous

*Anesthesia & Analgesia*, Vol.95, No.6, (December 2002), pp. 1739–1745 An˜ n, J.M.; Escuela, M.P.; Go´mez, V.; Moreno A.; Lo´pez, J.; Dý´az, R.; Montejo, J.C.; Sirgo,

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Fig. 3. Timing of tracheotomy after endotracheal intubation.

We assessed only four minor complications, regarding two episodes of tracheal rings fractures having no significant, and two minor stomal bleeding, without transfusion requirements.

One patient with enormous goitre was addressed directly to the ST, without consequence.

We attribute our low complication rates to careful evaluations of the right indications and the contraindications, and to the combination of the right timing of the procedure, and the fact that all procedures are performed in the CTICU by a team of experienced physicians, under bronchoscopic guidance.

In an our previous study (Mastropierro et al., 2009), we discovered bronchoscopy as an independent risk factor for VAP. Ever after, in our centre, the use of this technique is strictly controlled and decided by skilled and specialized health staff. Indications for this practice are well underlined in our protocols. PDT is a part of the indications, since, as demonstrated by literature and our experience, bronchoscopy has revealed to be useful for avoiding wrong insertions of tracheocannula and for finding possible endothracheal complications.

Among patients with tracheotomy, we detected an high mortality (48.5%), probably related to the high-risk profile of the patients referring to the heart and thoracic surgery, as preoperative comorbidities, complex surgery (19.5% was CABG combined with valve replacement), urgent surgery which was 18.6% of total. These factors increasing likelihood of prolonged MV, worsen the outcome. So the patients died with tracheotomy, but not for tracheotomy.

There is a paucity of clinical data describing the association of tracheotomy with patient outcomes, especially hospital mortality.

Marx et al. reported in their study a mortality rate of 0.39% (Marx et al., 1996).

Kollef in a prospective cohort study, describe outcomes of patients with respiratory failure in PMV, receiving a tracheostomy. They found the overall hospital mortality for patients receiving a tracheostomy (13.7%) was significantly less than the overall hospital mortality for patients with translaryngeal intubation (26.4%) (Kollef, 1999). Any reasons to explain this data are widely discussed.

Combining advances in technology and treatments with control healthcare costs, suggest that the effectiveness of patient care could be maintained or improved, and in meantime ICU expenses reduced.

The features of the cardiac surgery patients are changing, many of these suffering of multiple co morbidities. Concurrent with these changes, the needs for critical care service are increasing. Needham et al. estimated that the number of ICU patients who require MV will increase by 31% from 2000 to 2026 (Needham et al., 2005). PMV is commonly associated with substantially longer inpatient, ICU stay and higher cost.

In our experience PDT with broncoscopic guidance, that guarantees very low complications, must be considered as a best practice, aimed to reduce length of ICU and hospital stay, and to optimize healthcare resources.

Although we recognize some methodological limits in our study. First of all, it is an observational study and is not able to give strong messages. Missing data regard: the reasons of the failed early extubation in CTICU patients; the follow-up of the patients weaned from ventilator support in SNF, though there has always been a collaborative job between the CTICU and the SNF physicians. Current study also suggests to deepen the knowledge regarding both the incidence of VAP in patients with tracheotomy, performed with broncoscopic guidance and the real contribution of the early PDT to optimize healthcare recourses.

#### **12. References**

168 Global Perspectives on Bronchoscopy

We assessed only four minor complications, regarding two episodes of tracheal rings fractures having no significant, and two minor stomal bleeding, without transfusion

One patient with enormous goitre was addressed directly to the ST, without consequence. We attribute our low complication rates to careful evaluations of the right indications and the contraindications, and to the combination of the right timing of the procedure, and the fact that all procedures are performed in the CTICU by a team of experienced physicians,

In an our previous study (Mastropierro et al., 2009), we discovered bronchoscopy as an independent risk factor for VAP. Ever after, in our centre, the use of this technique is strictly controlled and decided by skilled and specialized health staff. Indications for this practice are well underlined in our protocols. PDT is a part of the indications, since, as demonstrated by literature and our experience, bronchoscopy has revealed to be useful for avoiding wrong insertions of tracheocannula and for finding possible endothracheal complications. Among patients with tracheotomy, we detected an high mortality (48.5%), probably related to the high-risk profile of the patients referring to the heart and thoracic surgery, as preoperative comorbidities, complex surgery (19.5% was CABG combined with valve replacement), urgent surgery which was 18.6% of total. These factors increasing likelihood of prolonged MV,

worsen the outcome. So the patients died with tracheotomy, but not for tracheotomy.

There is a paucity of clinical data describing the association of tracheotomy with patient

Fig. 3. Timing of tracheotomy after endotracheal intubation.

requirements.

under bronchoscopic guidance.

outcomes, especially hospital mortality.


Endoscopic Percutaneous Tracheotomy in Prolonged Intubation of

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**Section 5** 

**Pediatric Bronchoscopy** 

Tracheotomy Versus Prolonged Intubation of Mechanically Ventilated Patients After Cardiac Surgery. *Annals of Internal Medicine*, Vol.154, No.6, (March 2011), pp. 373-383.

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## **Section 5**

**Pediatric Bronchoscopy** 

174 Global Perspectives on Bronchoscopy

Yung-Lun Ni, Y.-L.; Lo, Y.-L.; Lin, T.-Y; Fang, Y.-F. & Kuo, H.-P. (2010). Conscious Sedation

*Chang Gung Med Journal*, Vol. 33, No. 4, (July-August 2010), pp. 443-452

373-383.

Tracheotomy Versus Prolonged Intubation of Mechanically Ventilated Patients After Cardiac Surgery. *Annals of Internal Medicine*, Vol.154, No.6, (March 2011), pp.

Reduces Patient Discomfort and Improves Satisfaction in Flexible Bronchoscopy.

**10** 

*Brazil* 

**Pediatric Bronchoscopy** 

Ana Cristina Barbosa Domingues and Rosana V. Mannarino

*Pediatric Pulmonology and Bronchoscopy of Antonio Pedro University Hospital, Fluminense Federal University, Pediatric Pulmonology of Jesus Hospital - SMS/RJ and Pediatric Bronchoscopy of Cardoso Fontes Federal Hospital - MS/RJ, Neonatal ICU and Pediatric Pulmonology and Bronchoscopy of Gafrée Guinle University Hospital - UNIRIO* 

The small size of the child's airway, differences in the anatomy of the larynx and the different pathologies according to age group, are characteristics that shows the endoscopic

The infant larynx presents some different aspects compared to the adult. Its location is higher in the neck, the cricoid cartilage being located approximately at the fourth cervical vertebra. With the growth of the child the cricoid cartilage will gradually descend to the level of the seventh cervical vertebra, which is the location in adulthood. The size of the larynx in the newborn is about 1 / 3 of the adult. Their structures such as the vocal process of arytenoid, cuneiform cartilage, the arytenoids and the soft tissue that makes up the supraglottic larynx are also bigger. The epiglottis is proportionally more posterior and

The normal glottis of the infant, has a very small opening, about 7 mm in anteroposterior dimension and 4 mm in the posterior transverse dimension, so that 1 mm of edema may cause an obstruction of the airway in 35% of normal. Similarly, cartilage, muscle and submucosal tissues are softer and friable, providing a greater inflammatory reaction with

**1. Introduction** 

**Particular aspects of upper airways anatomy in the child** 

narrower and more tubular or omega-shaped (Figure 1).

Fig. 1. Tubular or omega-shaped epiglottis of children.

examination of the child quite unique and different from adults.

Selma Maria de Azevedo Sias,

## **Pediatric Bronchoscopy**

#### Selma Maria de Azevedo Sias,

Ana Cristina Barbosa Domingues and Rosana V. Mannarino *Pediatric Pulmonology and Bronchoscopy of Antonio Pedro University Hospital, Fluminense Federal University, Pediatric Pulmonology of Jesus Hospital - SMS/RJ and Pediatric Bronchoscopy of Cardoso Fontes Federal Hospital - MS/RJ, Neonatal ICU and Pediatric Pulmonology and Bronchoscopy of Gafrée Guinle University Hospital - UNIRIO Brazil* 

#### **1. Introduction**

#### **Particular aspects of upper airways anatomy in the child**

The small size of the child's airway, differences in the anatomy of the larynx and the different pathologies according to age group, are characteristics that shows the endoscopic examination of the child quite unique and different from adults.

The infant larynx presents some different aspects compared to the adult. Its location is higher in the neck, the cricoid cartilage being located approximately at the fourth cervical vertebra. With the growth of the child the cricoid cartilage will gradually descend to the level of the seventh cervical vertebra, which is the location in adulthood. The size of the larynx in the newborn is about 1 / 3 of the adult. Their structures such as the vocal process of arytenoid, cuneiform cartilage, the arytenoids and the soft tissue that makes up the supraglottic larynx are also bigger. The epiglottis is proportionally more posterior and narrower and more tubular or omega-shaped (Figure 1).

Fig. 1. Tubular or omega-shaped epiglottis of children.

The normal glottis of the infant, has a very small opening, about 7 mm in anteroposterior dimension and 4 mm in the posterior transverse dimension, so that 1 mm of edema may cause an obstruction of the airway in 35% of normal. Similarly, cartilage, muscle and submucosal tissues are softer and friable, providing a greater inflammatory reaction with

Pediatric Bronchoscopy 179

It is important to make sure the equipment for advanced life support is available and to be aware that these data on requires as much care as general anesthesia. The minimal mandatory monitoring equipment includes: pulse oximetry, stethoscope, capnograph, electrocardiogram (rhythm and rate more important than ST-T wave changes), non-invasive blood pressure (Doppler assistance useful for small children) and temperature. It is also crucial to closely monitor skin color, skin perfusion, respiratory rate and pattern, diaphragmatic and intercostal activity and any evidence of airway obstruction such as

As a general rule, the smaller the children, the more incomplete their metabolism, specially concerning drugs. This group is more sensitive to depressant cardiovascular effects and to take longer to recover from anesthetics (exception must be made to the faster metabolism of remifentanil on neonates). Neonates and small children have reduced intracellular stores of calcium and reduced muscular mass of the myocardium, being susceptible to cardiac depressant effects of anesthetics. Neonates, especially prematures, are prone to post-anesthesia apnea, the greater incidence occurring in those ˂ 60 weeks post-conceptual age. They also have reduced demands of inhalational agents to produce adequate levels of anesthesia. In children above 2 years, the larger fraction of cardiac output to kidneys and liver in proportion to their weight is responsible for a faster

The available devices for bronchoscopy are the facemask, the nasopharyngeal prong, the laryngeal mask (LM) and the endotracheal tube. Both endotracheal tubes and laryngeal masks have proved to be safe, but, according to some studies, the LM (reusable) is more appropriate than other supraglottic devices, and in children above 2 years, it causes less

After the bronchoscopy has finished and if the child is stable, the patient will be moved to a recovery room and kept in the left lateral position. The child should still be monitored until

The most common complication is laryngospasm, related to light plane of anesthesia, pain, manipulation of the airway or cough. Hipoxemia can be caused by prolonged bronchoscopy, secretions or blood in the airway, bronchospasm or decreased cardiac output. Anesthetic agents can cause hypotension, especially in younger children.

Bronchoscopy is indicated in any chest or lung disease where the tracheobronchial tree may be involved directly or indirectly. You should always consider whether the benefits of information and / or therapy provided by the examination outweigh the risks because it is not free of complications. It can be performed using rigid or flexible devices. The best

Indications for flexible and rigid bronchoscopy are similar. However, in the evaluation of congenital malformations, the rigid bronchoscope provides better visualization, manipulation of anatomical structures, measurements of length and diameter of stenosis,

Bronchospasm can occur during the procedure. Malignant hyperthermia is rare.

**3. Indications and contraindications of bronchoscopy in children** 

bronchoscopic techniques should be chosen according to each case individually.

croup, retractions, tracheal tugging or stridor.

elimination rate of drugs.

awake and in control of the airway.

morbidity.

edema and significant reduction of airway lumen. The cricoid region has been described as narrowest of the airways, but recent studies in anesthetized children have shown that the glottis is narrower than the cricoid in all age groups.

#### **2. Anesthesia for pediatric bronchoscopy**

Anesthesia for invasive procedures on the airways has always been a challenge. The success of pediatric bronchoscopy relies on careful planning and constant communication between the bronchoscopist and the anesthetist throughout the procedure. In most cases the pediatric patient does not tolerate bronchoscopy whilst alert. Flexible bronchoscopy is usually performed with the use of sedation or sometimes local anaesthetic in infants and neonates, while rigid bronchoscopy requires general anesthesia. Our aim is to analyze some aspects that directly affect the actions and decisions of the anesthesist involved in the assistance.

The pre-anesthetic evaluation for this procedure consists of the child's history, physical examination and laboratory tests. The anesthetist should explain to parents how the anaesthesia will be administered and must be sure the child has been fasting. Infants under 1 year are recommended to fast for 6 hours if fed on formula, 4 hours if breast-fed and 2 hours after the ingestion of clear fluids only. Children over 1 year must fast for 6h after the ingestion of food or milk and 2h if only clear fluids were ingested. Only healthy children with no risk of slow gastric emptying may be allowed to have clear fluids before the procedure.

The best anesthetic technique and the most appropriate anesthetics should be considered according to some factors such as the child's physical status; an assessment of airways to identify chemical and /or physical lesions; the presence of lower respiratory infection with concomitant bronchospasm, secretions and edema, hypoxia and acidosis (due to severely compromised respiratory function); any co-existent disease; the needs of the bronchoscopist (some procedures during the bronchoscopy such as bronchoalveolar lavage or removal of foreign body increase the time of the examination) and the skills of the anesthetist. The consideration of all these aspects is essential to ensure the safety of the child, with minimal risk of complications. The risk of adverse events related to general anesthesia is associated with the physical status of the patient, thus being prudent to apply the scale of classification of physical status, established by the American Society of Anesthesiologists (Table 1).

In many cases, the pre-anesthetic use of bronchodilators and or anti-cholinergic drugs can improve the oxygen saturation and alveolar ventilation besides preventing, or attenuating, vagal responses of bradicardia and bronchoconstriction during the airway manipulation as well as reducing secretions.


\*ASA: American Society of Anesthesiologists

Table 1. ASA\* classification of physical status

edema and significant reduction of airway lumen. The cricoid region has been described as narrowest of the airways, but recent studies in anesthetized children have shown that the

Anesthesia for invasive procedures on the airways has always been a challenge. The success of pediatric bronchoscopy relies on careful planning and constant communication between the bronchoscopist and the anesthetist throughout the procedure. In most cases the pediatric patient does not tolerate bronchoscopy whilst alert. Flexible bronchoscopy is usually performed with the use of sedation or sometimes local anaesthetic in infants and neonates, while rigid bronchoscopy requires general anesthesia. Our aim is to analyze some aspects that directly affect the actions and decisions of the anesthesist involved in the assistance.

The pre-anesthetic evaluation for this procedure consists of the child's history, physical examination and laboratory tests. The anesthetist should explain to parents how the anaesthesia will be administered and must be sure the child has been fasting. Infants under 1 year are recommended to fast for 6 hours if fed on formula, 4 hours if breast-fed and 2 hours after the ingestion of clear fluids only. Children over 1 year must fast for 6h after the ingestion of food or milk and 2h if only clear fluids were ingested. Only healthy children with no risk of

The best anesthetic technique and the most appropriate anesthetics should be considered according to some factors such as the child's physical status; an assessment of airways to identify chemical and /or physical lesions; the presence of lower respiratory infection with concomitant bronchospasm, secretions and edema, hypoxia and acidosis (due to severely compromised respiratory function); any co-existent disease; the needs of the bronchoscopist (some procedures during the bronchoscopy such as bronchoalveolar lavage or removal of foreign body increase the time of the examination) and the skills of the anesthetist. The consideration of all these aspects is essential to ensure the safety of the child, with minimal risk of complications. The risk of adverse events related to general anesthesia is associated with the physical status of the patient, thus being prudent to apply the scale of classification of physical status, established by the American Society of Anesthesiologists (Table 1).

In many cases, the pre-anesthetic use of bronchodilators and or anti-cholinergic drugs can improve the oxygen saturation and alveolar ventilation besides preventing, or attenuating, vagal responses of bradicardia and bronchoconstriction during the airway manipulation as

ASA III Patient has a severe systemic disease that limits activity, but is not incapacitating.

ASA VI A declared brain-dead patient whose organs are being removed for donor purposes.

slow gastric emptying may be allowed to have clear fluids before the procedure.

glottis is narrower than the cricoid in all age groups.

**2. Anesthesia for pediatric bronchoscopy** 

well as reducing secretions.

ASA I Patient is entirely fit and healthy.

\*ASA: American Society of Anesthesiologists Table 1. ASA\* classification of physical status

ASA II A mild systemic disease is present, but does not limit activity.

ASA IV Patient has a chronic condition, which is a constant threat to life. ASA V Patient is likely to die within 24h, with or without treatment.

It is important to make sure the equipment for advanced life support is available and to be aware that these data on requires as much care as general anesthesia. The minimal mandatory monitoring equipment includes: pulse oximetry, stethoscope, capnograph, electrocardiogram (rhythm and rate more important than ST-T wave changes), non-invasive blood pressure (Doppler assistance useful for small children) and temperature. It is also crucial to closely monitor skin color, skin perfusion, respiratory rate and pattern, diaphragmatic and intercostal activity and any evidence of airway obstruction such as croup, retractions, tracheal tugging or stridor.

As a general rule, the smaller the children, the more incomplete their metabolism, specially concerning drugs. This group is more sensitive to depressant cardiovascular effects and to take longer to recover from anesthetics (exception must be made to the faster metabolism of remifentanil on neonates). Neonates and small children have reduced intracellular stores of calcium and reduced muscular mass of the myocardium, being susceptible to cardiac depressant effects of anesthetics. Neonates, especially prematures, are prone to post-anesthesia apnea, the greater incidence occurring in those ˂ 60 weeks post-conceptual age. They also have reduced demands of inhalational agents to produce adequate levels of anesthesia. In children above 2 years, the larger fraction of cardiac output to kidneys and liver in proportion to their weight is responsible for a faster elimination rate of drugs.

The available devices for bronchoscopy are the facemask, the nasopharyngeal prong, the laryngeal mask (LM) and the endotracheal tube. Both endotracheal tubes and laryngeal masks have proved to be safe, but, according to some studies, the LM (reusable) is more appropriate than other supraglottic devices, and in children above 2 years, it causes less morbidity.

After the bronchoscopy has finished and if the child is stable, the patient will be moved to a recovery room and kept in the left lateral position. The child should still be monitored until awake and in control of the airway.

The most common complication is laryngospasm, related to light plane of anesthesia, pain, manipulation of the airway or cough. Hipoxemia can be caused by prolonged bronchoscopy, secretions or blood in the airway, bronchospasm or decreased cardiac output. Anesthetic agents can cause hypotension, especially in younger children. Bronchospasm can occur during the procedure. Malignant hyperthermia is rare.

#### **3. Indications and contraindications of bronchoscopy in children**

Bronchoscopy is indicated in any chest or lung disease where the tracheobronchial tree may be involved directly or indirectly. You should always consider whether the benefits of information and / or therapy provided by the examination outweigh the risks because it is not free of complications. It can be performed using rigid or flexible devices. The best bronchoscopic techniques should be chosen according to each case individually.

Indications for flexible and rigid bronchoscopy are similar. However, in the evaluation of congenital malformations, the rigid bronchoscope provides better visualization, manipulation of anatomical structures, measurements of length and diameter of stenosis,

Pediatric Bronchoscopy 181

In the last century, rigid bronchoscopy was performed by chest surgeons or otorhinolaringologist. But with the advent of the flexible bronchoscope in the 70's, rigid bronchoscopy has been used less, although it is still considered an indispensable tool,

Although bronchoscopy training should include both the device and the floppy drive, it has

In Brazil, 45% of the members of the Department of Respiratory Endoscopy of the Brazilian Thoracic Society, who perform bronchoscopy feel able to perform rigid bronchoscopy. Less

In children, usually rigid bronchoscopy needs to be performed under general anesthesia and assisted ventilation. Even one of the most important advantages of rigid bronchoscopy is to allow control of the airway because the device is already inside the trachea, allowing adequate ventilation. However, manipulation with the rigid bronchoscope that is introduced orally, increases the risk of subglottic edema. This situation can be minimized by

**Patient age: mean (range) size outside diameter (mm)** 

Another advantage is the possibility of using various accessories instruments introduced through the bronchoscope such as suction tubes, forceps for biopsy, tumor resection and

choosing the appropriate size of the bronchoscope according to age group (Table 4).

**Premature infant** 2,5 3,7 **Term newborn (birth – 3 mo)** 3 4,8 **6 mo (3 – 18 mo)** 3,5 5,7 **18 mo (1 – 3 y)** 3,7 6,3 **3 y (1 ½ – 5 y)** 4 6,7 **5 y (3 – 10 y)** 5 7,8 **10 y (> 10 y – adolescent)** 6 8,2

Bronchial toilet, retained secretions, mucous plug, clots

Removal of foreign bodies in tracheobronchial tree

Endotracheal tube placement and replacement

Table 3. Major indications for therapeutic bronchoscopy

especially in the removal of foreign bodies in the airway.

Table 4. Size of the rigid bronchoscope according to age

been observed in most services increased use of flexible bronchoscopy.

than 15% of them had some experience with therapeutic bronchoscopy.

Tracheobronchial mucosa necrotic

Bronchogenic cysts (drainage)

After airway reconstruction

Hemoptysis

Strictures and stenosis

Mediastinal lesions

Cystic Fibrosis Asthma

Thoracic trauma

preoperative evaluation, as well as photographic documentation. In cases of removal of foreign bodies, preference is also rigid bronchoscopy.

#### **3.1 Rigid bronchoscopy**

The rigid bronchoscopes are straight metal tubes with side ventilation holes at the distal end. They have lighting system projecting light on its distal end. Rigid bronchoscopy can be performed under direct vision, but it is limited due to the small caliber of the airways of the child. Proximal illumination for rigid bronchoscopy is provided by prismatic light deflectors. An optical system magnifies the view. It can be coupled to a micro-camera generating the image on the display screen. Video monitoring can be used. This allows the team to anticipate needs and problems and to feel more a part of the procedure. A videorecorder can be used for bronchoscopy documentation (Figure 2). Tables 2 and 3 provide the indications for rigid bronchoscopy.

Fig. 2. Endoscopic instrumentation described from bottom to top: rigid bronchoscope (Storz) size 3.0 (20 cm), the optics of straightforward 0º telescope, metallic suction tube and laryngoscope.


Table 2. Major indications for diagnostic bronchoscopy

preoperative evaluation, as well as photographic documentation. In cases of removal of

The rigid bronchoscopes are straight metal tubes with side ventilation holes at the distal end. They have lighting system projecting light on its distal end. Rigid bronchoscopy can be performed under direct vision, but it is limited due to the small caliber of the airways of the child. Proximal illumination for rigid bronchoscopy is provided by prismatic light deflectors. An optical system magnifies the view. It can be coupled to a micro-camera generating the image on the display screen. Video monitoring can be used. This allows the team to anticipate needs and problems and to feel more a part of the procedure. A videorecorder can be used for bronchoscopy documentation (Figure 2). Tables 2 and 3

Fig. 2. Endoscopic instrumentation described from bottom to top: rigid bronchoscope (Storz)

size 3.0 (20 cm), the optics of straightforward 0º telescope, metallic suction tube and

foreign bodies, preference is also rigid bronchoscopy.

provide the indications for rigid bronchoscopy.

Persistent unexplained cough or wheeze

Recurrent infections of the airways or lungs Persistent abnormalities on chest radiograph

Assessment of endotracheal tube placement

Suspected tracheoesophageal fistula or broncoesofageal fistula

Chemical or thermal burns of the tracheobronchial tree Suspected foreign body in tracheobronchial tree

Table 2. Major indications for diagnostic bronchoscopy

Unexplained dyspnea or stridor Suspected congenital anomalies

Atelectatic lung, lobe or segment Diagnostic bronchoalveolar lavage

**3.1 Rigid bronchoscopy** 

laryngoscope.

Hemoptysis

Mediastinal tumor

Lung abscess

Thoracic trauma

Tracheobronchial stenosis

After airway reconstruction


Table 3. Major indications for therapeutic bronchoscopy

In the last century, rigid bronchoscopy was performed by chest surgeons or otorhinolaringologist. But with the advent of the flexible bronchoscope in the 70's, rigid bronchoscopy has been used less, although it is still considered an indispensable tool, especially in the removal of foreign bodies in the airway.

Although bronchoscopy training should include both the device and the floppy drive, it has been observed in most services increased use of flexible bronchoscopy.

In Brazil, 45% of the members of the Department of Respiratory Endoscopy of the Brazilian Thoracic Society, who perform bronchoscopy feel able to perform rigid bronchoscopy. Less than 15% of them had some experience with therapeutic bronchoscopy.

In children, usually rigid bronchoscopy needs to be performed under general anesthesia and assisted ventilation. Even one of the most important advantages of rigid bronchoscopy is to allow control of the airway because the device is already inside the trachea, allowing adequate ventilation. However, manipulation with the rigid bronchoscope that is introduced orally, increases the risk of subglottic edema. This situation can be minimized by choosing the appropriate size of the bronchoscope according to age group (Table 4).


Table 4. Size of the rigid bronchoscope according to age

Another advantage is the possibility of using various accessories instruments introduced through the bronchoscope such as suction tubes, forceps for biopsy, tumor resection and

Pediatric Bronchoscopy 183

Rigid bronchoscopy is most suitable for therapeutic procedures in particular the extraction of foreign bodies in the airways, tracheobronchial structures for dilation, stent placement for

Fig. 5. Total left pulmonary atelectasis (A) due to bronchial casts filling the left bronchus (B)

**B** 

Fig. 6. Chest radiograph shows pumonary abscess (A) and pus aspirated by bronchoscopy

Since 1981, the flexible bronchoscope (FB) has been used routinely in pediatric patients. Robert Wood was the forerunner in the use of this type of bronchoscope in children. FB are made of flexible fiber optic rods that transmit light and generate a magnified image through

Table 6 shows the types of flexible bronchoscopes used in children. In adults, the FB has an outer diameter of 6 mm and 2.2 mm working channel while the most commonly used in children has an outer diameter of 3.6 mm and working channel of 1.2 mm. Currently there is available a flexible bronchoscope with a 2.2 mm outside diameter can be used in preterm infants, but do not have a working channel. The small diameter working channel prevents the introduction of accessories instruments. FB is indicated in sample collection and in the exploitation of airway. However some treatment can be indicated in FB as alveolar

proteinosis and lipoid pneumonia due to aspiration of mineral oil.

airway, control of hemoptysis and CO2-laser therapy (Figure 5, 6).

**A B C**

that was removed (C).

**A** 

**3.2 Flexible bronchoscopy** 

a lens system (Figure 7, 8).

(B).

removal of foreign bodies (Figure 3, 4). There are four types of forcepscupped forceps (biopsy), alligator forceps, scissors and punch or cutting forceps (biopsy). Forceps for flexible bronchoscopes are more limited in size and strength than forceps for rigid bronchoscopes. They include biopsy forceps, baskets, claws and ballons.

Fig. 3. Forceps and brush washed.

Fig. 4. Tracheal dilators can be used in children for dilation of subglottic stenosis.

Another limitation of rigid bronchoscopy is the difficulty in accessing the bronchi of smaller caliber, as well as the upper lobe bronchus. Table 5 shows the advantages and disadvantages of rigid bronchoscopy.


Table 5. Advantages and disadvantages of rigid bronchoscopy

removal of foreign bodies (Figure 3, 4). There are four types of forcepscupped forceps (biopsy), alligator forceps, scissors and punch or cutting forceps (biopsy). Forceps for flexible bronchoscopes are more limited in size and strength than forceps for rigid

bronchoscopes. They include biopsy forceps, baskets, claws and ballons.

Fig. 4. Tracheal dilators can be used in children for dilation of subglottic stenosis.

Excellent control of the airway Need for general anesthesia

Lower cost Difficulty in obtaining BAL

Table 5. Advantages and disadvantages of rigid bronchoscopy

Another limitation of rigid bronchoscopy is the difficulty in accessing the bronchi of smaller caliber, as well as the upper lobe bronchus. Table 5 shows the advantages and

**Advantages Disadvantages**

Difficulty in assessing the dynamics of

Increased risk of trauma to the airway

Inability to reach into the the upper lobes

normal vocal cords

and segmental bronchi

Fig. 3. Forceps and brush washed.

disadvantages of rigid bronchoscopy.

accessories

or tissue biopsy

Better image quality

Inside diameter allowing use of instruments

Greater ability to suction secretions, blood

Performed in the operating room facilitating

management of complications

Rigid bronchoscopy is most suitable for therapeutic procedures in particular the extraction of foreign bodies in the airways, tracheobronchial structures for dilation, stent placement for airway, control of hemoptysis and CO2-laser therapy (Figure 5, 6).

Fig. 5. Total left pulmonary atelectasis (A) due to bronchial casts filling the left bronchus (B) that was removed (C).

Fig. 6. Chest radiograph shows pumonary abscess (A) and pus aspirated by bronchoscopy (B).

#### **3.2 Flexible bronchoscopy**

Since 1981, the flexible bronchoscope (FB) has been used routinely in pediatric patients. Robert Wood was the forerunner in the use of this type of bronchoscope in children. FB are made of flexible fiber optic rods that transmit light and generate a magnified image through a lens system (Figure 7, 8).

Table 6 shows the types of flexible bronchoscopes used in children. In adults, the FB has an outer diameter of 6 mm and 2.2 mm working channel while the most commonly used in children has an outer diameter of 3.6 mm and working channel of 1.2 mm. Currently there is available a flexible bronchoscope with a 2.2 mm outside diameter can be used in preterm infants, but do not have a working channel. The small diameter working channel prevents the introduction of accessories instruments. FB is indicated in sample collection and in the exploitation of airway. However some treatment can be indicated in FB as alveolar proteinosis and lipoid pneumonia due to aspiration of mineral oil.

Pediatric Bronchoscopy 185

B

Fig. 9. Chronic pneumonia in the right lung (A). Bronchoscopy image shows enlargement of the main carina and narrowing of the right main bronchus due to extrinsic compression (B).

intubations, monitoring and patient follow-up, to help as tracheotomy, and the extraction of

Nowadays came a new generation of bronchoscopes that have a chip on its distal end. These are the videobroncoscopes, with higher resolution and image storage in digital format. Pediatric models are available in size with outside diameter of 3.6 y 4.9 mm. The

New techniques are being developed, such as endobronchial ultrasound since 1999 and most recently ultrasonic bronchoscope with transbronchial needle, but without experience

Evaluate the position, patency, or other changes related to ETT or tracheostomy

In general there is no absolute contraindication to bronchoscopy. Wood RE related that the only absolute contraindication to bronchoscopy is the lack of a rational indication. However it is contraindicated in cases of unstable cardiovascular status or life-threatening cardiac

BAAR and culture of BAL isolated *M.tuberculosis.* 

same cases of foreign bodies (table 7).

in the child population.

A

Persistent atelectasis

Chronic cough Hemoptysis

Stridor

Samples

BAL therapy

**3.3 Contraindications** 

disadvantage is the high cost of equipment.

Recurrent or / and persistent infiltrations Pulmonary lesions of unknown etiology

Assess the damage of inhalation or aspiration

Table 7. Indications for flexible bronchoscopy in pediatrics

Removal of some foreign body

Bronchoscopic lung biopsy

Remove secretions or mucus plaques

Fig. 7. Flexible bronchoscope 3,6 mm and 4,9 mm (OD).

Fig. 8. Flexible bronchoscope showing the various dimensions (3,6 mm and 4,9 mm OD).


Table 6. Flexible Bronchoscopes used in pediatrics

In most cases, the flexible bronchoscopy can be performed without general anesthesia using lidocaine and topical anesthesia with sedation. Then it can be performed outside the operating room. The FB can be inserted through the nostrils, laryngeal masks, endotracheal tubes, tracheostomy tube or through the rigid bronchoscope. It also has the advantage of allowing the examination of segmental and subsegmental bronchi, optimizing the exploitation of the distal airway.

It is suitable for exploration of the airways, for intra-operative assessment and also postoperative assessment, for obtain biological samples such as bronchoalveolar lavage, transbronchial biopsy and bronchial brushing, for diagnosis of pneumonia in immunocompromised patients, interstitial pneumonia, hemosiderosis, sarcoidosis, alveolar proteinosis, Langerhans, endoluminal obstructive disease and aspiration syndromes (Figure 9).

The therapeutic application is more limited compared with rigid bronchoscopy, but can be used in endobronchial secretions aspiration, instillation of drugs, guide in difficult

Fig. 8. Flexible bronchoscope showing the various dimensions (3,6 mm and 4,9 mm OD).

**Outside diameter (OD)** 4,9 mm 3,6 mm 2,8 mm 2,2mm **Working channel** 2,2 mm 1,2 mm 1,2 mm Nenhum **Viewing angle** 100º 95º 90º 75º **Endotracheal tube** ≥5, ≥4,5 ≥4,5 ≥3,5 **Age of child** > 4 y standard pediatric < 4 y newborn

In most cases, the flexible bronchoscopy can be performed without general anesthesia using lidocaine and topical anesthesia with sedation. Then it can be performed outside the operating room. The FB can be inserted through the nostrils, laryngeal masks, endotracheal tubes, tracheostomy tube or through the rigid bronchoscope. It also has the advantage of allowing the examination of segmental and subsegmental bronchi, optimizing the

It is suitable for exploration of the airways, for intra-operative assessment and also postoperative assessment, for obtain biological samples such as bronchoalveolar lavage, transbronchial biopsy and bronchial brushing, for diagnosis of pneumonia in immunocompromised patients, interstitial pneumonia, hemosiderosis, sarcoidosis, alveolar proteinosis, Langerhans, endoluminal obstructive disease and aspiration syndromes (Figure 9). The therapeutic application is more limited compared with rigid bronchoscopy, but can be used in endobronchial secretions aspiration, instillation of drugs, guide in difficult

Fig. 7. Flexible bronchoscope 3,6 mm and 4,9 mm (OD).

Table 6. Flexible Bronchoscopes used in pediatrics

exploitation of the distal airway.

Fig. 9. Chronic pneumonia in the right lung (A). Bronchoscopy image shows enlargement of the main carina and narrowing of the right main bronchus due to extrinsic compression (B). BAAR and culture of BAL isolated *M.tuberculosis.* 

intubations, monitoring and patient follow-up, to help as tracheotomy, and the extraction of same cases of foreign bodies (table 7).

Nowadays came a new generation of bronchoscopes that have a chip on its distal end. These are the videobroncoscopes, with higher resolution and image storage in digital format. Pediatric models are available in size with outside diameter of 3.6 y 4.9 mm. The disadvantage is the high cost of equipment.

New techniques are being developed, such as endobronchial ultrasound since 1999 and most recently ultrasonic bronchoscope with transbronchial needle, but without experience in the child population.

Stridor Persistent atelectasis Recurrent or / and persistent infiltrations Pulmonary lesions of unknown etiology Chronic cough Hemoptysis Removal of some foreign body Evaluate the position, patency, or other changes related to ETT or tracheostomy Assess the damage of inhalation or aspiration Samples Bronchoscopic lung biopsy Remove secretions or mucus plaques BAL therapy

Table 7. Indications for flexible bronchoscopy in pediatrics

#### **3.3 Contraindications**

In general there is no absolute contraindication to bronchoscopy. Wood RE related that the only absolute contraindication to bronchoscopy is the lack of a rational indication. However it is contraindicated in cases of unstable cardiovascular status or life-threatening cardiac

Pediatric Bronchoscopy 187

In children bronchoscopy is performed under intravenous sedation (0.05 – 0.3 mg/kg Midazolan) and topical lidocaine anesthesia of the upper airways (4% lidocaine gel to the nasal passage and 1% lidocaine through the bronchoscope to the glotic region) using a exible bronchoscope (external diameter of 2.8 / 3.6mm for small children and a diameter of

Each child should have an intravenous access and should be monitored with pulse oximetry, and heart rate and administered O2 by nasal catheter. Immediate access to supplemental oxygen, resuscitation equipment and antagonists for sedative agents (naloxone and flumazenil) should be readily available. A swivel Y connector should be used in endotracheal tube, in intubated children. Cough can be controlled if small amount of 1% lidocaine is administered through the channel of bronchoscopio when it reaches the trachea. It is carried out careful inspection of the tracheobronchial tree and the FB is wedged into the involved segments previously indicated by CT scan or if the disease is diffuse, the most

BAL is carried out using normal sterile pyrogen-free saline previously warmed to body temperature (37ºC) with a syringe attached to the suction channel of the FB for controlled aspiration with a suction trap. Negative pressure of 120 mmHg is adequate for obtaining return of BAL. It is instilled 3 aliquots of 1 ml/kg body weight in each compromised segment or lobe previously indicated by CT scan. Each instillation must be followed by sufficient air to ensure that the channel's dead space is empty and it should be immediately recovered by manual suction through a syringe or using the mechanical aspiration. The first aliquot collected should be used for culture because it probably represents bronchial origin. The others are pooled and processed for cytological studies and analysis of BAL solutes

Some authors use functional residual capacity (FRC) to get the BAL. The total volume has been used at a rate of 5 to 15% of FRC, which is proportional to the total volume per FRC used in adults. BAL can be considered technically adequated if the recovery is more than 40% and contains few epithelial cells. BAL fluid must be transported under refrigeration and

**SUPERNATANT** (- 20 to – 70º): Proteins, inflammatory mediators

**MICROBIOLOGY**: Culture, molecular biology

H&E, Sudan, Silver methenamine, PAS, Pearls

**CITOLOGY**: total cell, cell count differential, Stains: Gram,

The macroscopic aspect of the BAL should be evaluated because it may suggest some diseases. In lipoid pneumonia the BAL fluid has milky appearance, floating fat globules and numerous Sudan positive foam macrophages. (Figure 10). In hemorrhagic syndromes the

4.6 / 4.9 mm for >9 yrs of age).

(Table 8).

**BAL** 

suitable segments are the right middle lobe or the lingula.

Table 8. Laboratory processing of BAL

processed in a maximum of 1 hour.

BAL can be xanthochromic.

arrhytmia, extremely severe hypoxemia and an inadequately trained bronchoscopist and bronchoscopy team.

Rigid bronchoscopy is relatively contraindicated in micrognathia, microstomia, cervical spine instability and mandibulomaxillary trauma or disease.

Flexible bronchoscopy is relatively contraindicated in some foreign body aspiration, hemorrhagic diathesis, severe hipoxemia and respiratory distress. Trombocytopenia is not a contraindication to pediatric bronchoscopy.

#### **4. Bronchocoalveolar lavage in children**

Since the 80's with the advent of a flexible bronchoscope, bronchoscopy is being increasingly used as a diagnostic tool in several lung diseases in children.

The bronchoalveolar lavage (BAL) is a resource used in bronchoscopy that has helped to increase the sensitivity and specificity of the bronchoscopy. Several studies have been published using the BAL for the diagnosis of various lung diseases, especially persistent or recurrent pneumonia, interstitial infiltrates, severe pneumonia in patients in intensive care units and pulmonary infiltrates in immunocompromised patients. Examination of BAL fluid can identify the etiologic agent in these types of pneumonia. BAL is considered a safe procedure and fast, with low percentage of complications, even in infants, and in many cases makes open lung biopsy unnecessary.

In children the BAL is commonly used for diagnosis of opportunistic infections in immunocompromised patients. BAL has a sensitivity and specificity comparable to those of open lung biopsy. However, unlike this, has much lower morbidity and mortality, although it is also an invasive procedure.

Another indication is in the cases of recurrent or persistent pulmonary infiltrates of unknown etiology. BAL is an diagnosis tool for children under age 6 who have difficulty, because of the age, to collect sputum for microbiological studies. Molecular biology allows identification of pathogens from small samples. In addition, analysis of cellular and non cellular components of BAL fluid can define the diagnosis of non-infectious causes of pulmonary infiltrates. Thus, the diagnosis of diseases such as alveolar proteinosis, hemosiderosis, lipid aspiration pneumonia, interstitial pneumonia, can be done by BAL.

The study of BAL has also contributed to understanding the pathogenesis of interstitial lung diseases and it has now been used to evaluate the treatment and prognosis of these diseases. Analysis of BAL solutes, including proteins and inflammatory mediators can be studied.

The BAL can be indicated as therapy in cases of alveolar proteinosis, for removal of secretions in cystic fibrosis and, in severe cases of status asthmaticus. BAL can be both a diagnostic or therapeutic tool even in critically ill children.

#### **4.1 Techniques of BAL and the laboratory processing**

Flexible bronchoscopy with bronchoalveolar lavage should be done safely in intensive care unit, special procedures areas and operating rooms.

arrhytmia, extremely severe hypoxemia and an inadequately trained bronchoscopist and

Rigid bronchoscopy is relatively contraindicated in micrognathia, microstomia, cervical

Flexible bronchoscopy is relatively contraindicated in some foreign body aspiration, hemorrhagic diathesis, severe hipoxemia and respiratory distress. Trombocytopenia is not a

Since the 80's with the advent of a flexible bronchoscope, bronchoscopy is being increasingly

The bronchoalveolar lavage (BAL) is a resource used in bronchoscopy that has helped to increase the sensitivity and specificity of the bronchoscopy. Several studies have been published using the BAL for the diagnosis of various lung diseases, especially persistent or recurrent pneumonia, interstitial infiltrates, severe pneumonia in patients in intensive care units and pulmonary infiltrates in immunocompromised patients. Examination of BAL fluid can identify the etiologic agent in these types of pneumonia. BAL is considered a safe procedure and fast, with low percentage of complications, even in infants, and in many

In children the BAL is commonly used for diagnosis of opportunistic infections in immunocompromised patients. BAL has a sensitivity and specificity comparable to those of open lung biopsy. However, unlike this, has much lower morbidity and mortality, although

Another indication is in the cases of recurrent or persistent pulmonary infiltrates of unknown etiology. BAL is an diagnosis tool for children under age 6 who have difficulty, because of the age, to collect sputum for microbiological studies. Molecular biology allows identification of pathogens from small samples. In addition, analysis of cellular and non cellular components of BAL fluid can define the diagnosis of non-infectious causes of pulmonary infiltrates. Thus, the diagnosis of diseases such as alveolar proteinosis, hemosiderosis, lipid aspiration pneumonia, interstitial pneumonia, can be done by BAL.

The study of BAL has also contributed to understanding the pathogenesis of interstitial lung diseases and it has now been used to evaluate the treatment and prognosis of these diseases. Analysis of BAL solutes, including proteins and inflammatory mediators can be

The BAL can be indicated as therapy in cases of alveolar proteinosis, for removal of secretions in cystic fibrosis and, in severe cases of status asthmaticus. BAL can be both a

Flexible bronchoscopy with bronchoalveolar lavage should be done safely in intensive care

spine instability and mandibulomaxillary trauma or disease.

used as a diagnostic tool in several lung diseases in children.

diagnostic or therapeutic tool even in critically ill children.

**4.1 Techniques of BAL and the laboratory processing** 

unit, special procedures areas and operating rooms.

contraindication to pediatric bronchoscopy.

cases makes open lung biopsy unnecessary.

it is also an invasive procedure.

studied.

**4. Bronchocoalveolar lavage in children** 

bronchoscopy team.

In children bronchoscopy is performed under intravenous sedation (0.05 – 0.3 mg/kg Midazolan) and topical lidocaine anesthesia of the upper airways (4% lidocaine gel to the nasal passage and 1% lidocaine through the bronchoscope to the glotic region) using a exible bronchoscope (external diameter of 2.8 / 3.6mm for small children and a diameter of 4.6 / 4.9 mm for >9 yrs of age).

Each child should have an intravenous access and should be monitored with pulse oximetry, and heart rate and administered O2 by nasal catheter. Immediate access to supplemental oxygen, resuscitation equipment and antagonists for sedative agents (naloxone and flumazenil) should be readily available. A swivel Y connector should be used in endotracheal tube, in intubated children. Cough can be controlled if small amount of 1% lidocaine is administered through the channel of bronchoscopio when it reaches the trachea.

It is carried out careful inspection of the tracheobronchial tree and the FB is wedged into the involved segments previously indicated by CT scan or if the disease is diffuse, the most suitable segments are the right middle lobe or the lingula.

BAL is carried out using normal sterile pyrogen-free saline previously warmed to body temperature (37ºC) with a syringe attached to the suction channel of the FB for controlled aspiration with a suction trap. Negative pressure of 120 mmHg is adequate for obtaining return of BAL. It is instilled 3 aliquots of 1 ml/kg body weight in each compromised segment or lobe previously indicated by CT scan. Each instillation must be followed by sufficient air to ensure that the channel's dead space is empty and it should be immediately recovered by manual suction through a syringe or using the mechanical aspiration. The first aliquot collected should be used for culture because it probably represents bronchial origin. The others are pooled and processed for cytological studies and analysis of BAL solutes (Table 8).

**MICROBIOLOGY**: Culture, molecular biology

**CITOLOGY**: total cell, cell count differential, Stains: Gram, H&E, Sudan, Silver methenamine, PAS, Pearls

**SUPERNATANT** (- 20 to – 70º): Proteins, inflammatory mediators

Table 8. Laboratory processing of BAL

Some authors use functional residual capacity (FRC) to get the BAL. The total volume has been used at a rate of 5 to 15% of FRC, which is proportional to the total volume per FRC used in adults. BAL can be considered technically adequated if the recovery is more than 40% and contains few epithelial cells. BAL fluid must be transported under refrigeration and processed in a maximum of 1 hour.

The macroscopic aspect of the BAL should be evaluated because it may suggest some diseases. In lipoid pneumonia the BAL fluid has milky appearance, floating fat globules and numerous Sudan positive foam macrophages. (Figure 10). In hemorrhagic syndromes the BAL can be xanthochromic.

Pediatric Bronchoscopy 189

Fig. 11. BAL with large amounts of PAS-positive material in and out of cells (PAS 100 x).

**A B** 

Fig. 12. BAL with large number of cells with predominance of foamy cytoplasm

orange (B) (Sudan 400X).

(Gomori-Grocott 400x).

culture.

macrophages (A) (Giemsa 400X) and numerous macrophages with foamy cytoplasm stained

Fig. 13. BAL of immunocompromised child with chronic pneumonia shows a group of fungi

The presence of microorganisms in BAL fluid does not necessarily indicate they are the causative agents of pneumonia due to the possibility of contamination with the flora of the nasal or oropharynx. However, the growth of bacteria in the BAL should be enhanced through the use of protected a catheter or protected or by the quantitative bacteriological

Fig. 10. Macroscopic aspect of BAL in children with Lipoid pneumonia: milky appearance with oating fat.

Routine laboratorial analysis for bacteria (routine aerobic, *Legionella, Nocardia, Mycobacteria*  including *Mycobacterium tuberculosis,* Virus (CMV, RSV, Influenza, Parainfluenza, Enterovirus) and or cultivation of anaerobes, anaerobic transport media containing reducing agents may be used and the BAL fluid must not be exposed to air.

Cell counts are determined in Neubauer chamber and cell viability by trypan blue exclusion dye.Cytospins prepar after 5 min at 200g speed, are stained for bacterial (Gram), lipid-laden macrophages (Sudan or Oil red), lipoproteins in pulmonary alveolar proteinosis (PAS periodic acid-Schiff), hemosiderin in idiopathic pulmonary hemosiderosis, Wegener's granulomatosis and Goodpasture's disease (Pearls), pulmonary histiocytosis X (monoclonal antibody OKT-6), fungi (Silver methenamine or Gomori-Grocott), *Mycobacterium tuberculosis* (Ziehl Neelsen) and Papanicolaou and May-Grunwald–Giemsa. Glutaraldehyde fixation for electron microscopy is performed if is necessary. (Figure 11, 12, 13).

The BAL cytology in healthy children is similar to that observed in healthy adults. In children the total cell counts tende to be higher in younger children (Table 9).

The interpretation of the differential cytology of BAL fluid can suggest the diagnosis of different types of lung diseases. Macrophages are the predominant cells followed by lymphocytes while the percentage of neutrophils appears to be higher in children under than 12 months. In general, in the absence of infection, the BAL of children have higher percentages of macrophages (upper to 90%) while those suffering from viral or bacterial infection have greater increases in the percentage of neutrophils. Unlike the adult the CD4/CD8 ratio in children has been found to be lower. The predominance of eosinophils in BAL suggests eosinophilic pneumonia or drug toxicity.

Although LBA prolongs the duration of bronchoscopy, because the bronchoscope stays longer in the airways, there is an increased risk of complications when compared with bronchoscopy simple. The main complications of the procedure are temporary, such as tachypnea without cardiac decompensation, and fever spikes 4 to 6 hours after the procedure. Other possible complications include hypoxemia that is most often minimized by concomitant administration of oxygen during the procedure and transient bronchospasm.

BAL has become a valuable procedure because, unlike lung biopsy is less invasive, well tolerated by patients, insurance and low percentage of complications, even in infants.

Fig. 10. Macroscopic aspect of BAL in children with Lipoid pneumonia: milky appearance

Routine laboratorial analysis for bacteria (routine aerobic, *Legionella, Nocardia, Mycobacteria*  including *Mycobacterium tuberculosis,* Virus (CMV, RSV, Influenza, Parainfluenza, Enterovirus) and or cultivation of anaerobes, anaerobic transport media containing reducing

Cell counts are determined in Neubauer chamber and cell viability by trypan blue exclusion dye.Cytospins prepar after 5 min at 200g speed, are stained for bacterial (Gram), lipid-laden macrophages (Sudan or Oil red), lipoproteins in pulmonary alveolar proteinosis (PAS periodic acid-Schiff), hemosiderin in idiopathic pulmonary hemosiderosis, Wegener's granulomatosis and Goodpasture's disease (Pearls), pulmonary histiocytosis X (monoclonal antibody OKT-6), fungi (Silver methenamine or Gomori-Grocott), *Mycobacterium tuberculosis* (Ziehl Neelsen) and Papanicolaou and May-Grunwald–Giemsa. Glutaraldehyde fixation for

The BAL cytology in healthy children is similar to that observed in healthy adults. In

The interpretation of the differential cytology of BAL fluid can suggest the diagnosis of different types of lung diseases. Macrophages are the predominant cells followed by lymphocytes while the percentage of neutrophils appears to be higher in children under than 12 months. In general, in the absence of infection, the BAL of children have higher percentages of macrophages (upper to 90%) while those suffering from viral or bacterial infection have greater increases in the percentage of neutrophils. Unlike the adult the CD4/CD8 ratio in children has been found to be lower. The predominance of eosinophils in

Although LBA prolongs the duration of bronchoscopy, because the bronchoscope stays longer in the airways, there is an increased risk of complications when compared with bronchoscopy simple. The main complications of the procedure are temporary, such as tachypnea without cardiac decompensation, and fever spikes 4 to 6 hours after the procedure. Other possible complications include hypoxemia that is most often minimized by concomitant administration of oxygen during the procedure and transient

BAL has become a valuable procedure because, unlike lung biopsy is less invasive, well tolerated by patients, insurance and low percentage of complications, even in infants.

agents may be used and the BAL fluid must not be exposed to air.

electron microscopy is performed if is necessary. (Figure 11, 12, 13).

BAL suggests eosinophilic pneumonia or drug toxicity.

children the total cell counts tende to be higher in younger children (Table 9).

with oating fat.

bronchospasm.

Fig. 11. BAL with large amounts of PAS-positive material in and out of cells (PAS 100 x).

Fig. 12. BAL with large number of cells with predominance of foamy cytoplasm macrophages (A) (Giemsa 400X) and numerous macrophages with foamy cytoplasm stained orange (B) (Sudan 400X).

Fig. 13. BAL of immunocompromised child with chronic pneumonia shows a group of fungi (Gomori-Grocott 400x).

The presence of microorganisms in BAL fluid does not necessarily indicate they are the causative agents of pneumonia due to the possibility of contamination with the flora of the nasal or oropharynx. However, the growth of bacteria in the BAL should be enhanced through the use of protected a catheter or protected or by the quantitative bacteriological culture.

Pediatric Bronchoscopy 191

Bronchial biopsies can be performed under direct vision although some endoscopists has been preferred to use flexible bronchoscope. Adult flexible bronchoscope (4.9 mm OD) is also used for biopsies because a 2.0mm instrumentation channel is needed for most biopsy forceps. Standard 1.8 mm diameter forceps are also used to obtain bronchial samples, although the 1,1 forceps has been successfully used, too. We have to keep in mind that the size of the samples obtained with the 1,1 forceps are obviously smaller, and the successful rate of the technique could decrease because of that. An adequate sample for analysis must show at least 1mm of basal membrane, sufficient subepithelial stroma for inflammation assessment, areas of smooth muscle and submucosal glands. In general the number of

In general the technique is well tolerated and no important bleeding or pneumothorax has been reported. Different from transbronchial biopsy, routine chest radiography is not necessary as we don't go through bronchial wall during the procedure. The risk of major bleeding increases in biopsies of very vascularized lesions. In these cases, 1–2 ml of adrenalin at 1 / 20.000 should be instilled previous to the procedure. General anesthesia or deep sedation is usually used to avoid patient movement during the procedure and to

Transbronchial biopsy (TB) is a procedure performed to obtain lung fragments, using an appropriate flexible biopsy forceps, which is inserted through the bronchoscope. The aim of this procedure is to collect material from the lung parenchyma using a minimally invasive procedure. Although, TB is routinely used in adult patients with a good diagnostic yield in many situations since the 70s, its role in children took longer to be established. Issues related to the techniques

Currently, TB has a well-defined role for the monitoring of pediatric patients who underwent a lung or a heart-lung transplantation, when it is performed with wellestablished protocols during the first year after transplantation to assess the presence of

Transbronchial biopsy in this setting was able to detect asymptomatic rejection in up to 24% of cases (Faro et al., 2004). It must also be performed when there is any abnormality of the heart`s transplant patient presented with cough, dyspnea or fever associated with radiological findings or in the presence of decline in lung function. Although the diagnostic yield of TB in patients with other medical conditions, with or without immunodeficiency, may reach 67%, ERS Task Force considers the role of TB in non-transplanted patients are still controversial. Some studies also demonstrate the use of TB for the diagnosis of other diseases such as lung disease in immunosuppressed patients, sarcoidosis, eosinophilic

Transbronchial biopsy can be performed either through a flexible or rigid bronchoscope. For the flexible bronchoscope, it is generally used the adult model with an outer diameter of 4.9 mm and a 2.2 mm working-channel diameter, which is not often a problem for older children (figure 14). For the younger children, smaller diameter bronchoscopes may be used with working-channels as narrow as 1.2 mm, which also involves the usage of smaller forceps, which could lessen the chances of obtaining adequate samples for analysis,

used, the yield results and the safety of the procedure possibly contributed to this fact.

biopsies performed for a trustworthy analysis varies from a minimum of 1 up to 6.

increase safety, specially in children.

**5.2 Transbronchial biopsy** 

rejection or infection.

granuloma and lymphoma.


Age range is given in years, except where indicated by #; \*: First interquartile to third interquartile. LA: local anaesthesia; GA: general anaesthesia; FRC: functional residual capacity; ND: not done.

Table 9. Normal BAL cell count parameters in healthy children

#### **5. Other special procedures in pediatric bronchoscopy**

#### **5.1 Bronchial biopsy**

Bronchial biopsy is performed in the mucosa or in an endobronchial lesion allowing the assessment of the epithelium, the basal membrane and even the smooth muscle.

This procedure is safely used in research studies of respiratory disorders including asthma, recurrent wheezing, and cystic fibrosis, and has already revealed its usefulness for the diagnosis of either infectious or non-infectious granulomatous diseases (tuberculosis, sarcoidosis), endobronchial tumors, chronic fungal diseases, and for the management of difficult-to-control asthma. Although bronchial biopsy is appropriate for harvesting ciliated cells for the diagnosis of primary ciliary dyskinesia, nasal brushing remains the recommendable technique to be performed in this disorder due to its simplicity, with equal results.

Ratjen et al 1995

No. of children 11 48 18 16 11 Age range 1-15 3-5 1#-10 2#-3 4-16 Sedation LA GA GA LA LA No. of aliquots 6 3 3 2 6 Vol.saline 10% FRC 3ml.Kg-1 3ml-1 20ml 10% FRC

> 58±15 NR NR

10.3 ± 11.1 7.3 0.5±57.1

81.2±12.7 84 34.6-94

16.2±12.4 12.5 2-61

1.9±2.9 0.9 0-17

0.4±0.6 0.2 0-3.6

local anaesthesia; GA: general anaesthesia; FRC: functional residual capacity; ND: not done.

assessment of the epithelium, the basal membrane and even the smooth muscle.

Age range is given in years, except where indicated by #; \*: First interquartile to third interquartile. LA:

Bronchial biopsy is performed in the mucosa or in an endobronchial lesion allowing the

This procedure is safely used in research studies of respiratory disorders including asthma, recurrent wheezing, and cystic fibrosis, and has already revealed its usefulness for the diagnosis of either infectious or non-infectious granulomatous diseases (tuberculosis, sarcoidosis), endobronchial tumors, chronic fungal diseases, and for the management of difficult-to-control asthma. Although bronchial biopsy is appropriate for harvesting ciliated cells for the diagnosis of primary ciliary dyskinesia, nasal brushing remains the recommendable technique to be

Riedler et al 1995

NR 62.5 42.5-71.5

ND 15.5 7.5±25.8\*

NR 91 84.2-94\*

NR 7.5 4.7-12.8\*

NR 1.7 0.6-3.5\*

NR 0.2 0-0.3\* Midulla et al 1995

43.1±12.2 42.5 20-65

59.9 ± 32.9 51 0 20±130

86±7.8 87 71-98

8.7±5.8 7 2-22

5.5±4.8 3.5 0-17

0.2±0.3 0 0-1

Tessier et al 1996

69.7±9.6 68 52-87

35.1 ± 18.4 30.5 9±68

89.9±5.5 92.5 77-98

8.9±5.6 8 2-22

1.2±1.2 1 0-3

0 0 0

Clement et AL

BAL fluid recovered %

Alveolar Macrophage %

mean ± SD median range X 104 cells.mL-1 mean±SD median range

media±SD mediana range

Lymphocyte % media±SD median range

Neutrophil % media±SD median range

Eosinophil % media±SD median range

**5.1 Bronchial biopsy** 

1987

NR NR NR

25.5 ± 13.6 24 7.0±50

89.7±5.2 89 85-97

8.7±4.6 10 1-17

1.3±0.9 1 0-3

NR NR NR

Table 9. Normal BAL cell count parameters in healthy children

**5. Other special procedures in pediatric bronchoscopy** 

performed in this disorder due to its simplicity, with equal results.

Bronchial biopsies can be performed under direct vision although some endoscopists has been preferred to use flexible bronchoscope. Adult flexible bronchoscope (4.9 mm OD) is also used for biopsies because a 2.0mm instrumentation channel is needed for most biopsy forceps. Standard 1.8 mm diameter forceps are also used to obtain bronchial samples, although the 1,1 forceps has been successfully used, too. We have to keep in mind that the size of the samples obtained with the 1,1 forceps are obviously smaller, and the successful rate of the technique could decrease because of that. An adequate sample for analysis must show at least 1mm of basal membrane, sufficient subepithelial stroma for inflammation assessment, areas of smooth muscle and submucosal glands. In general the number of biopsies performed for a trustworthy analysis varies from a minimum of 1 up to 6.

In general the technique is well tolerated and no important bleeding or pneumothorax has been reported. Different from transbronchial biopsy, routine chest radiography is not necessary as we don't go through bronchial wall during the procedure. The risk of major bleeding increases in biopsies of very vascularized lesions. In these cases, 1–2 ml of adrenalin at 1 / 20.000 should be instilled previous to the procedure. General anesthesia or deep sedation is usually used to avoid patient movement during the procedure and to increase safety, specially in children.

#### **5.2 Transbronchial biopsy**

Transbronchial biopsy (TB) is a procedure performed to obtain lung fragments, using an appropriate flexible biopsy forceps, which is inserted through the bronchoscope. The aim of this procedure is to collect material from the lung parenchyma using a minimally invasive procedure. Although, TB is routinely used in adult patients with a good diagnostic yield in many situations since the 70s, its role in children took longer to be established. Issues related to the techniques used, the yield results and the safety of the procedure possibly contributed to this fact.

Currently, TB has a well-defined role for the monitoring of pediatric patients who underwent a lung or a heart-lung transplantation, when it is performed with wellestablished protocols during the first year after transplantation to assess the presence of rejection or infection.

Transbronchial biopsy in this setting was able to detect asymptomatic rejection in up to 24% of cases (Faro et al., 2004). It must also be performed when there is any abnormality of the heart`s transplant patient presented with cough, dyspnea or fever associated with radiological findings or in the presence of decline in lung function. Although the diagnostic yield of TB in patients with other medical conditions, with or without immunodeficiency, may reach 67%, ERS Task Force considers the role of TB in non-transplanted patients are still controversial. Some studies also demonstrate the use of TB for the diagnosis of other diseases such as lung disease in immunosuppressed patients, sarcoidosis, eosinophilic granuloma and lymphoma.

Transbronchial biopsy can be performed either through a flexible or rigid bronchoscope. For the flexible bronchoscope, it is generally used the adult model with an outer diameter of 4.9 mm and a 2.2 mm working-channel diameter, which is not often a problem for older children (figure 14). For the younger children, smaller diameter bronchoscopes may be used with working-channels as narrow as 1.2 mm, which also involves the usage of smaller forceps, which could lessen the chances of obtaining adequate samples for analysis,

Pediatric Bronchoscopy 193

The majority victims are infants and children, early in life, with the predominant age of 4 years. The male over female prevails in most published works, probably the most curious and impulsive nature of the boys. According to Reilly et al, children younger than 4 years are more susceptible to FBA injuries due to their lack of molar teeth, oral exploration, and poor swallowing coordination. Usually the coordination between chewing and swallowing is completed around 5 years old. The caregiver was present at the time of injury in 48.9%of

Foreign body aspiration in children is associated with a failure of the laryngeal closure reflex, poor control of swallowing and habit of putting objects in the mouth. The negligence of some parents with certain objects might can be aspirated, as small toys and some foods

Foreign bodies may be organic or inorganic material. The origin of organic vegetables are more common: peanuts, beans, corn, fruits and seeds. Beans and peanuts are the most frequently aspirated. However the type of foreign body aspiration varies according to regional food habits. Dried vegetables stimulates an inflammatory reaction within a few hours, making the extraction extremely hard. Foreign bodies can be found from animal sources like chicken bone, and teeth fragments. The non-organic may be metal or plastic. The most frequent non-organic FBA are plastic pen cap, earring, pin, plastic toy, nib, nail, hair clip, earring tuners, small plastic parts. In recent years, children have been increasingly

exposed to the electronic technologies containing buttons and batteries (Figure 15).

Fig. 15. Total atelectasis caused by corn removed from the left main bronchus.

Clinically, FBA manifests as a coughing, followed by choking, which may or may not be valued by parents. Most often, this is currently not seen by parents or guardians, a fact that delays the diagnosis, unless the aspiration is followed by complete obstruction of the

Clinical findings depend on the type, size and location of foreign body and including persistent cough, located air intake, localized or diffuse, wheezing and breathing difficulties. Approximately 40% of the patients are asymptomatic and no changes in physical

Foreign bodies may be located in the larynx, trachea and bronchi. The most commonly

examination. The FBA can also be suspected in the first sudden onset of wheezing.

found is in the right main bronchus, due to anatomical position of this bronchus.

The symptoms will depend on the location:

cases (82.3% while the children were eating, and 33.8% while playing).

are predisposing factors.

airway.

potentially decreasing the diagnostic yield. The rigid bronchoscope could also be used for these younger children, thus allowing the use of larger forceps with no significant differences in technique.

Fig. 14. Flexible bronchoscope with biopsy forceps on its distal end.

The technique for obtaining fragments from distal airways is the same as described by the ERS Task Force. In the absence of localized disease, at least two lobes should be approached. However, only one lung should be sampled to minimize the risk of bilateral pneumothorax. The minimum number of fragments to be harvested is still uncertain, ranging from 3 to 4, depending on the experience of each service. The use of fluoroscopy can be a great value for the procedure, since it allows a more accurate location of the biopsy forceps, and also the assessment off its operation during the procedure, despite the limitations of the two-dimensional image generated. ERS Task Force considers the use of fluoroscopy mandatory to perform TB.

Overall, TB is a safe procedure when performed by experienced professional. Less serious complications include transient hypoxemia, fever and dyspnea . Serious complications include bleeding and pneumothorax, and occur in around 5% of the patients submitted to TB, although series of patients reported the incidence of pneumothorax up to 12%. Recent publications reported the incidence of pneumothorax and bleeding around 2%. The complications rate appears to be higher than that observed in adult patients. The use of positive pressure ventilation can theoretically contribute to a higher incidence of pneumothorax. Therefore, TB should be performed during spontaneous ventilation whenever it's possible. TB seems to be a technique that deserves better use, still being underused in clinical pediatrics.

#### **6. Foreing body aspiration**

Accidents in childhood are important causes of morbidity and mortality worldwide , requiring prompt recognition and early treatment to minimize the risk of serious fatal consequences. Among the accidents, there is a foreign body aspiration (FBA) of the airway. United States of America statistics show that 5% of deaths from accidents with children under 4 years are due to FBA, which is also the main cause of accidental death at home in children under 6 years. In Brazil, the FBA is the third leading cause of accidents with death.

Currently, the foreign body aspiration remains an emergency, presents itself the same way as in earlier times, but with diminishing considerable morbidity and mortality.

potentially decreasing the diagnostic yield. The rigid bronchoscope could also be used for these younger children, thus allowing the use of larger forceps with no significant

The technique for obtaining fragments from distal airways is the same as described by the ERS Task Force. In the absence of localized disease, at least two lobes should be approached. However, only one lung should be sampled to minimize the risk of bilateral pneumothorax. The minimum number of fragments to be harvested is still uncertain, ranging from 3 to 4, depending on the experience of each service. The use of fluoroscopy can be a great value for the procedure, since it allows a more accurate location of the biopsy forceps, and also the assessment off its operation during the procedure, despite the limitations of the two-dimensional image generated.

Overall, TB is a safe procedure when performed by experienced professional. Less serious complications include transient hypoxemia, fever and dyspnea . Serious complications include bleeding and pneumothorax, and occur in around 5% of the patients submitted to TB, although series of patients reported the incidence of pneumothorax up to 12%. Recent publications reported the incidence of pneumothorax and bleeding around 2%. The complications rate appears to be higher than that observed in adult patients. The use of positive pressure ventilation can theoretically contribute to a higher incidence of pneumothorax. Therefore, TB should be performed during spontaneous ventilation whenever it's possible. TB seems to be a technique that deserves better use, still being

Accidents in childhood are important causes of morbidity and mortality worldwide , requiring prompt recognition and early treatment to minimize the risk of serious fatal consequences. Among the accidents, there is a foreign body aspiration (FBA) of the airway. United States of America statistics show that 5% of deaths from accidents with children under 4 years are due to FBA, which is also the main cause of accidental death at home in children under 6 years. In Brazil, the FBA is the third leading cause of accidents with death. Currently, the foreign body aspiration remains an emergency, presents itself the same way

as in earlier times, but with diminishing considerable morbidity and mortality.

Fig. 14. Flexible bronchoscope with biopsy forceps on its distal end.

ERS Task Force considers the use of fluoroscopy mandatory to perform TB.

differences in technique.

underused in clinical pediatrics.

**6. Foreing body aspiration** 

The majority victims are infants and children, early in life, with the predominant age of 4 years. The male over female prevails in most published works, probably the most curious and impulsive nature of the boys. According to Reilly et al, children younger than 4 years are more susceptible to FBA injuries due to their lack of molar teeth, oral exploration, and poor swallowing coordination. Usually the coordination between chewing and swallowing is completed around 5 years old. The caregiver was present at the time of injury in 48.9%of cases (82.3% while the children were eating, and 33.8% while playing).

Foreign body aspiration in children is associated with a failure of the laryngeal closure reflex, poor control of swallowing and habit of putting objects in the mouth. The negligence of some parents with certain objects might can be aspirated, as small toys and some foods are predisposing factors.

Foreign bodies may be organic or inorganic material. The origin of organic vegetables are more common: peanuts, beans, corn, fruits and seeds. Beans and peanuts are the most frequently aspirated. However the type of foreign body aspiration varies according to regional food habits. Dried vegetables stimulates an inflammatory reaction within a few hours, making the extraction extremely hard. Foreign bodies can be found from animal sources like chicken bone, and teeth fragments. The non-organic may be metal or plastic. The most frequent non-organic FBA are plastic pen cap, earring, pin, plastic toy, nib, nail, hair clip, earring tuners, small plastic parts. In recent years, children have been increasingly exposed to the electronic technologies containing buttons and batteries (Figure 15).

Fig. 15. Total atelectasis caused by corn removed from the left main bronchus.

Clinically, FBA manifests as a coughing, followed by choking, which may or may not be valued by parents. Most often, this is currently not seen by parents or guardians, a fact that delays the diagnosis, unless the aspiration is followed by complete obstruction of the airway.

Clinical findings depend on the type, size and location of foreign body and including persistent cough, located air intake, localized or diffuse, wheezing and breathing difficulties. Approximately 40% of the patients are asymptomatic and no changes in physical examination. The FBA can also be suspected in the first sudden onset of wheezing.

Foreign bodies may be located in the larynx, trachea and bronchi. The most commonly found is in the right main bronchus, due to anatomical position of this bronchus.

The symptoms will depend on the location:

Pediatric Bronchoscopy 195

type of foreign body, aided by optical rigid. In some cases fragments of foreign bodies are removed through small size bronchial lavage with saline solution and suction aspiration

A radiological control should be done. Antibiotics and steroids are necessary in some

In cases of foreign body be larger than the opening of the glottis tracheostomy will be necessary. Thoracotomy is indicated when it is not possible to extract the foreign body by bronchoscopy after several attempts. The review of the tracheobronchial tree should be done

Peri-operative complications, such as bronchospasm, bleeding, pneumotorax and

FBA are a life-threatening event in children that require early diagnosis and prompt successful management. Prevention is the most critical element in reducing morbidity and is considered the most effective treatment of FBA injuries. Changes in product design, campaigns of prevention of accidents in childhood, education of parents and carers are strategies that have been used to reduce morbidity and mortality caused by foreign body

Stridor is acute respiratory noise that results of a turbulent airflow due to blockage of

The incidence of stridor ranging from 13.5% to 96% of endoscopies. It is higher in newborns and infants, with an average age of 4 months. In newborns and infants, the caliber of the airway is more narrow, and any obstruction can result in a blockage to the passage of air, resulting in a turbulent airflow. The preponderance of males over females is not clear. The most common is the inspiratory stridor, with origins in the larynx, upper trachea or

The child with stridor should be examined carefully, starting with detailed history, followed by physical examination, radiological and endoscopic examination. Is very important to a good history, emphasizing a history of intubation, its duration and size of the endotracheal tube, history of trauma during intubation and the number of times that the child was intubated. Information such as age of onset of stridor, the duration of the stridor, the association with triggering agents, such as tears and pain, the association with the position (prone, supine, or sitting), the quality or nature of crying, the presence of other symptoms such as paroxysmal cough, cyanosis and aspiration are important and should be investigated.

If symptoms worsen in the supine position and improve in prone, may be caused by laryngomalacia, or tracheal compression by the innominate artery. In the prone position, the structures obstruct the airway and stridor increases. It is important to evaluate the morphology of the skull in relation to malformations, the presence of micrognathia or retrognathia, cyanosis, signs of infection in the oral cavity, the presence of excessive salivation or oral secretions, use of accessory respiratory muscles, throbbing of the nose,

cannulas. Subsequently should be performed the review of tracheobronchial tree.

patients due to inflammatory reaction triggered by plant and animal aspiration.

in 2 to 4 weeks depending on the case.

**7. Stridor and congenital airway anomalies** 

airway. It is the most frequent indication for bronchoscopy.

chest wall retraction and the child's level of consciousness.

desaturation can occur.

aspiration.

hypopharynx.

Larynx: supraglottic (cough, dysphagia or difficulty to swallow food or saliva swallowing, inspiratory stridor); glottal (dysphonia, inspiratory stridor) (Figure 16) and subglottic (dyspnea or shortness of breath accompanied by chest indrawing, supraclavicular, suprasternal or universal).

Trachea: wheezing audible sound from the shock of the foreign body against the subglottis during expiration or coughing, cyanosis, retractions suprasternal, supraclavicular, intercostal, biphasic stridor, dysphagia, suffocation and sudden death.

Bronchi: clinical manifestations depend on the caliber that the foreign body occupies within the bronchial lumen. When there is atelectasis and a significant portion of the lung is involved can occur tachypnea, retractions, dullness to percussion and decreased breath sounds. Crackles may be present if there is infection.

Fig. 16. Fish bone in 2-year-old boy presenting dysphonia and inspiratory dyspnea.

Although the radiographic study should be performed in almost all cases, it is reiterated that the decision for endoscopic investigation is always warranted before a history and physical examination suggestive of aspiration.

Radiological study using the technical inspiration and forced expiration, is altered in most cases. The main radiological abnormalities are lung hyperinflation and atelectasis. Normal chest radiograph, consolidations, and radiopaque foreign bodies are reported less frequently.

Chest X-ray should remain the initial imaging modality for patients with clinically suspected of FBA. Nevertheless, in cases with normal chest X-ray and clinical suspicion of FBA, multi-slice computed tomography possibly integrated with virtual bronchoscopy should be considered to avoid unnecessary bronchoscopy.

The early diagnosis of FBA is essential. Large number of patients are treated for weeks and months due to recurrent respiratory diseases before the suspicion of FBA. Late diagnosis or wrong results in respiratory complications such as recurrent pneumonia, lung abscess, and obstruction of the airway which can be fatal.

Bronchoscopy is the procedure of choice for foreign body removal. The authors prefer the rigid bronchoscope because it has less risk of complications.

Patients are submitted to rigid bronchoscopy under general inhalation anesthesia and assisted ventilation. The foreign body extraction is performed by special clamps for each

Larynx: supraglottic (cough, dysphagia or difficulty to swallow food or saliva swallowing, inspiratory stridor); glottal (dysphonia, inspiratory stridor) (Figure 16) and subglottic (dyspnea or shortness of breath accompanied by chest indrawing, supraclavicular,

Trachea: wheezing audible sound from the shock of the foreign body against the subglottis during expiration or coughing, cyanosis, retractions suprasternal, supraclavicular,

Bronchi: clinical manifestations depend on the caliber that the foreign body occupies within the bronchial lumen. When there is atelectasis and a significant portion of the lung is involved can occur tachypnea, retractions, dullness to percussion and decreased breath

Fig. 16. Fish bone in 2-year-old boy presenting dysphonia and inspiratory dyspnea.

Although the radiographic study should be performed in almost all cases, it is reiterated that the decision for endoscopic investigation is always warranted before a history and

Radiological study using the technical inspiration and forced expiration, is altered in most cases. The main radiological abnormalities are lung hyperinflation and atelectasis. Normal chest radiograph, consolidations, and radiopaque foreign bodies are reported less

Chest X-ray should remain the initial imaging modality for patients with clinically suspected of FBA. Nevertheless, in cases with normal chest X-ray and clinical suspicion of FBA, multi-slice computed tomography possibly integrated with virtual bronchoscopy

The early diagnosis of FBA is essential. Large number of patients are treated for weeks and months due to recurrent respiratory diseases before the suspicion of FBA. Late diagnosis or wrong results in respiratory complications such as recurrent pneumonia, lung abscess, and

Bronchoscopy is the procedure of choice for foreign body removal. The authors prefer the

Patients are submitted to rigid bronchoscopy under general inhalation anesthesia and assisted ventilation. The foreign body extraction is performed by special clamps for each

intercostal, biphasic stridor, dysphagia, suffocation and sudden death.

sounds. Crackles may be present if there is infection.

physical examination suggestive of aspiration.

obstruction of the airway which can be fatal.

should be considered to avoid unnecessary bronchoscopy.

rigid bronchoscope because it has less risk of complications.

frequently.

suprasternal or universal).

type of foreign body, aided by optical rigid. In some cases fragments of foreign bodies are removed through small size bronchial lavage with saline solution and suction aspiration cannulas. Subsequently should be performed the review of tracheobronchial tree.

A radiological control should be done. Antibiotics and steroids are necessary in some patients due to inflammatory reaction triggered by plant and animal aspiration.

In cases of foreign body be larger than the opening of the glottis tracheostomy will be necessary. Thoracotomy is indicated when it is not possible to extract the foreign body by bronchoscopy after several attempts. The review of the tracheobronchial tree should be done in 2 to 4 weeks depending on the case.

Peri-operative complications, such as bronchospasm, bleeding, pneumotorax and desaturation can occur.

FBA are a life-threatening event in children that require early diagnosis and prompt successful management. Prevention is the most critical element in reducing morbidity and is considered the most effective treatment of FBA injuries. Changes in product design, campaigns of prevention of accidents in childhood, education of parents and carers are strategies that have been used to reduce morbidity and mortality caused by foreign body aspiration.

#### **7. Stridor and congenital airway anomalies**

Stridor is acute respiratory noise that results of a turbulent airflow due to blockage of airway. It is the most frequent indication for bronchoscopy.

The incidence of stridor ranging from 13.5% to 96% of endoscopies. It is higher in newborns and infants, with an average age of 4 months. In newborns and infants, the caliber of the airway is more narrow, and any obstruction can result in a blockage to the passage of air, resulting in a turbulent airflow. The preponderance of males over females is not clear. The most common is the inspiratory stridor, with origins in the larynx, upper trachea or hypopharynx.

The child with stridor should be examined carefully, starting with detailed history, followed by physical examination, radiological and endoscopic examination. Is very important to a good history, emphasizing a history of intubation, its duration and size of the endotracheal tube, history of trauma during intubation and the number of times that the child was intubated. Information such as age of onset of stridor, the duration of the stridor, the association with triggering agents, such as tears and pain, the association with the position (prone, supine, or sitting), the quality or nature of crying, the presence of other symptoms such as paroxysmal cough, cyanosis and aspiration are important and should be investigated.

If symptoms worsen in the supine position and improve in prone, may be caused by laryngomalacia, or tracheal compression by the innominate artery. In the prone position, the structures obstruct the airway and stridor increases. It is important to evaluate the morphology of the skull in relation to malformations, the presence of micrognathia or retrognathia, cyanosis, signs of infection in the oral cavity, the presence of excessive salivation or oral secretions, use of accessory respiratory muscles, throbbing of the nose, chest wall retraction and the child's level of consciousness.

Pediatric Bronchoscopy 197

**A B C** 

Fig. 17. Inspiratory collapse of cuneiform cartilages (A), anterior collapse of the cuneiform

The vocal cord paralysis is another frequent cause of stridor (Figure 18). Vocal cord paralysis secondary to congenital disorders of the central nervous system is common and often is associated with multiple anomalies, as Arnould-Chiari syndrome. The vocal cord paralysis can be acquired as a result of iatrogenic repair of cardiovascular disorders, most common cause of unilateral paralysis of vocal cords. Paralysis of vocal cords acquired from

Acquired subglottic stenosis is also a frequent cause of stridor, usually secondary to intubation (Figure 19). The incidence of acquired subglottic stenosis is increasing due to

Differential diagnosis of base of tongue mass includes lingual thyroid, thyroglossal duct cyst, lymphoid hyperplasia, hemangioma, teratoma, adenoma, salivary gland tumor,

cartilages (B) and long tubular epiglottis (C).

trauma and infections, is rare.

Fig. 18. Left vocal cord paralysis.

improved care of premature.

fibroma, dermoid cyst, and carcinoma.

Fig. 19. Acquired subglottis stenosis.

Chest X-ray should be mandatory in all patients. Images of the neck and upper airway are useful for evaluating the air columns above and below the larynx and the lung parenchyma, allowing us to follow the evolution of local collapse and obstruction. High kilovoltage techniques are useful to observe the larynx, vocal cords and subglottic region. Fluoroscopy, barium swallow, computed tomography, and electromagnetic resonance may be useful in the diagnosis of structural and / or dynamic changes of the tracheobronchial tree, such as tracheomalacia, tracheal or bronchial compression by anomalous vessel, patients with swallowing disorders, laryngeal cleft, vascular ring, tracheoesophageal fistula and radiolucent esophageal foreign bodies. Although these tests can contribute to the differential diagnosis of stridor, bronchoscopy is establishing a definitive diagnosis.

The main causes of stridor are congenital and occur more frequently in the larynx, followed by the trachea and bronchi. Table 10 shows the causes of stridor by anatomical location.


Table 10. Most common causes of stridor in children

Laryngomalacia is the most common congenital anomaly of the larynx and the most important cause of stridor, predominantly in males in the ratio 1.6 / 1 (Figure 17). May be isolated or associated with other abnormalities of the airways such as tracheomalacia, bronchomalacia, vocal cord paralysis, subglottic stenosis, hypertrophy of adenoids.

Chest X-ray should be mandatory in all patients. Images of the neck and upper airway are useful for evaluating the air columns above and below the larynx and the lung parenchyma, allowing us to follow the evolution of local collapse and obstruction. High kilovoltage techniques are useful to observe the larynx, vocal cords and subglottic region. Fluoroscopy, barium swallow, computed tomography, and electromagnetic resonance may be useful in the diagnosis of structural and / or dynamic changes of the tracheobronchial tree, such as tracheomalacia, tracheal or bronchial compression by anomalous vessel, patients with swallowing disorders, laryngeal cleft, vascular ring, tracheoesophageal fistula and radiolucent esophageal foreign bodies. Although these tests can contribute to the differential diagnosis of stridor, bronchoscopy is establishing a

The main causes of stridor are congenital and occur more frequently in the larynx, followed by the trachea and bronchi. Table 10 shows the causes of stridor by anatomical location.

> Paralysis of vocal cords (congenital and adquired) Infections conditions (croup and epiglottitis) Subglottic stenosis (congenital and adquired)

Vascular anomalies (aberrant innominate artery, double aortic arch,

Choanal atresia

Laryngomalacia

Hemangioma

Webs, atresia Cleft larynx

Trauma Foreign body

Tumors, cysts and masses Craniofacial anomalies

Saccular cysts e laryngoceles

Laryngeal pappilomatosis

pulmonary artery sling)

Infections conditions Pulmonary sequestration

Foreign body

Table 10. Most common causes of stridor in children

Tracheomalacia, Bronchomalacia Tracheoesophageal fistula

Tracheal web, cysts and stenosis Accessory bronchi and lobes

Asthma, bronchiolitis, bronchitis

Laryngomalacia is the most common congenital anomaly of the larynx and the most important cause of stridor, predominantly in males in the ratio 1.6 / 1 (Figure 17). May be isolated or associated with other abnormalities of the airways such as tracheomalacia,

bronchomalacia, vocal cord paralysis, subglottic stenosis, hypertrophy of adenoids.

definitive diagnosis.

**Upper airway** 

**Larynx** 

**Lower airway**

Fig. 17. Inspiratory collapse of cuneiform cartilages (A), anterior collapse of the cuneiform cartilages (B) and long tubular epiglottis (C).

The vocal cord paralysis is another frequent cause of stridor (Figure 18). Vocal cord paralysis secondary to congenital disorders of the central nervous system is common and often is associated with multiple anomalies, as Arnould-Chiari syndrome. The vocal cord paralysis can be acquired as a result of iatrogenic repair of cardiovascular disorders, most common cause of unilateral paralysis of vocal cords. Paralysis of vocal cords acquired from trauma and infections, is rare.

Fig. 18. Left vocal cord paralysis.

Acquired subglottic stenosis is also a frequent cause of stridor, usually secondary to intubation (Figure 19). The incidence of acquired subglottic stenosis is increasing due to improved care of premature.

Differential diagnosis of base of tongue mass includes lingual thyroid, thyroglossal duct cyst, lymphoid hyperplasia, hemangioma, teratoma, adenoma, salivary gland tumor, fibroma, dermoid cyst, and carcinoma.

Fig. 19. Acquired subglottis stenosis.

Pediatric Bronchoscopy 199

Becker, HD. Bronchoscopy: the past, the present, and the future. *Clin Chest Med*, Vol.31,

de Fenoyl, O. (1989). Transbronchial biopsy without fluoroscopy: a five year experience in outpatients. *Thorax*, Vol.44, No.11, (November 1989), pp 956-959, ISSN 0040-6376 Fan, LL. (1997). Diagnostic value of transbronchial, thoracoscopic, and open lung biopsy in

Fraga, AMA. (2008). Foreign body aspiration in children: clinical aspects, radiological

Greene, CL. (2008). Role of clinically indicated transbronchial lung biopsies in the

Holinger, LD & Green CG. (1997). Anatomy. In: *Pediatric Laryngology & Bronchoesophagology*,

Holinger, LD & Green CG. (1997). Instrumentation, epquipment and standardization. In:

Holinger, LD (1980) Etiology of stridor in the neonate, infant and child. *Ann Otol Rhinol Laryngol,* Vol.89, No.5 Pt.1, (September-October 1980), pp 397-400, ISSN 0003-4894 Holinger, LD (1997). Evolution of stridor and wheezing. In: *Pediatric Laryngology x* 

Hui, H. (2008). Therapeutic experience from 1428 patients with pediatric tracheobronchial foreign body. *J Pediatr Surg*. Vol.43, No.4, (April 2008), pp 718-721, ISSN 0022-3468 Jaggar SI & Haxby E. (2002). Sedation, anaesthesia and monitoring for bronchoscopy. *Paediatr Respir Rev*, Vol.3, No. 4, (December 2002), pp 321-327, ISSN 1526-0542 Korlacki, W. (2011). Foreign body aspiration and therapeutic role of bronchoscopy. *Pediatr* 

Malherbe, S. & Ansermino, JM. (2010). Total intravenous anesthesia and spontaneous

Mancuso, RF. (1996). Stridor in Neonates. *Pediatr Clin North Am*, Vol.43, No.6, (December

Meduri, GU. (1991). Bilateral bronchoalveolar lavage in the diagnosis of opportunistic

Mendonça Picinin, IF (2011) Cell count and lymphocyte immunophenotyping of

Muntz, HR. (1992). Pediatric transbronchial lung biopsy. *Ann Otol Rhinol Laryngol*, Vol.101,

Naguib, ML. (2005). Use of laryngeal mask airway in flexible bronchoscopy in infants and children. *Pediatr Pulmonol*, Vol.39, No.1, (January 2005), pp 56-63, ISSN 8755-6863

ventilation for foreign body removal in children: how much drug? *Anesth Analg*,

pulmonary infections. Chest, Vol.100, No.5, (October 1991), pp 1272-1276, ISSN

bronchoalveolar lavage fluid in healthy Brazilian children. *Eur Respir J*, Vol.38,

*Surg Int*, Vol.27, No.8, (August 2011), pp 833-837, INSS 1437-9813

Vol.111, No.6, (December 2010), pp 1566, ISSN 1526-7598

No.3, (September 2011), pp 738-739, ISSN 1399-3003

No.2 Pt 1, (February 1992), pp 135-7, ISSN 0003-4894

65-80, Lippincott-Raven, INSB 0-397-51650-9, Philadelphia

immunocompetent children with chronic interstitial lung disease. *J Pediatr*, Vol.131,

aspects and bronchoscopic treatment. *J Bras Pneumol,*Vol.34, No.2, (February 2008),

management of pediatric post-lung transplant patients. *Ann Thorac Surg*, Vol.86,

Lolinger LD, Lusk RP & Green CG, pp 19-33, Lippincott-Raven, INSB 0-397-51650-

*Pediatric Laryngology & Bronchoesophagology*, Holinger LD, Lusk RP & Green CG, pp

*Bronchoesophagology*. Hollinger, LD; Green, C; Lusk, R. pp 41-48, Lippincott-Raven

No.1, (March 2010), pp 1-18, ISSN 1557-8216

No.4, (October 1997), pp 565-569, ISSN 0022-3476

No.1, (July 2008), pp 198-203, ISSN 1552-6259

, ISBN 0-397-51650-9, Philadelphia

1996), pp 1339-1356, ISSN 1557-8240

1931-3543

pp.74-82, ISSN 1806-3756

9, Philadelphia

The ectopic thyroid may be present in the tongue, although it is a rare injury, can occur in infants. The hygroma generally affects the hypopharynx and the supraglottic region, causing sometimes very important obstructions to breathing. Hemangiomas are the most common tumors of childhood , the incidence ranged from 1% to 3%. Papilloma is the most common laryngeal tumor.

The most patients affected by laryngeal trauma are those undergoing mechanical ventilation. The severity of the injury is related to the number and duration of endotracheal intubation.

The craniofacial anomalies may have severe impairment of the airways. The cause of airway obstruction in micrognathia is ptosis of the tongue. The children in prone position improved significantly. In more severe cases the tracheostomy is indicated.

In general the stridor caused by extrinsic compression of the trachea and bronchi is expiratory. The endoscopic examination can show pulsatile compression of the anterior wall of the trachea caused by double aortic arch, pulmonary sling and aberrant innominate artery. Symptoms such as dysphagia, recurrent vomiting, and chronic respiratory failure may be associated with stridor.

Respiratory infections also can cause stridor. They are most often of viral etiology. The most common are croup, epiglottitis and tracheitis. In general in cases of bacterial etiology there are high fever associated with toxemia. Endoscopy is indicated when the child does not respond to medical therapy, has prolonged or recurrent seizures and low age.

Congenital laryngeal membrane is unusual. The majority is glottic and is extending into the subglottis.

Atresia and stenosis are common congenital abnormalities in the nose, with an incidence of 1 in 7000 newborns, predominantly in males. Unilateral atresia is twice as common than bilateral and is associated with other craniofacial abnormalities facias.

Bronchial abnormalities most common are additional, stenosed and collapsed bronchus. Generally, bronchial abnormalities may be associated with other visceral anomalies, including inversus situs, intestinal malrotation and cardiac malformations.

Congenital tracheal stenosis is rare. The diagnosis is made by bronchoscopy that is the best procedure to define the extent of the stenosis.

#### **8. Acknowledgment**

We thank to Dr. Guilherme Millward for kind enough to give some photographic material.

#### **9. References**


The ectopic thyroid may be present in the tongue, although it is a rare injury, can occur in infants. The hygroma generally affects the hypopharynx and the supraglottic region, causing sometimes very important obstructions to breathing. Hemangiomas are the most common tumors of childhood , the incidence ranged from 1% to 3%. Papilloma is the most

The most patients affected by laryngeal trauma are those undergoing mechanical ventilation. The severity of the injury is related to the number and duration of endotracheal

The craniofacial anomalies may have severe impairment of the airways. The cause of airway obstruction in micrognathia is ptosis of the tongue. The children in prone position improved

In general the stridor caused by extrinsic compression of the trachea and bronchi is expiratory. The endoscopic examination can show pulsatile compression of the anterior wall of the trachea caused by double aortic arch, pulmonary sling and aberrant innominate artery. Symptoms such as dysphagia, recurrent vomiting, and chronic respiratory failure

Respiratory infections also can cause stridor. They are most often of viral etiology. The most common are croup, epiglottitis and tracheitis. In general in cases of bacterial etiology there are high fever associated with toxemia. Endoscopy is indicated when the child does not

Congenital laryngeal membrane is unusual. The majority is glottic and is extending into the

Atresia and stenosis are common congenital abnormalities in the nose, with an incidence of 1 in 7000 newborns, predominantly in males. Unilateral atresia is twice as common than

Bronchial abnormalities most common are additional, stenosed and collapsed bronchus. Generally, bronchial abnormalities may be associated with other visceral anomalies,

Congenital tracheal stenosis is rare. The diagnosis is made by bronchoscopy that is the best

We thank to Dr. Guilherme Millward for kind enough to give some photographic material.

Baker, PA. (2010). A prospective randomized trial comparing supraglottic airways for

Barbato, A. (1997). Use of the paediatric bronchoscope, flexible and rigid, in 51 European centres. *Eur Respir J*, Vol.10, No.8, (August 1997), pp 1761-6, ISSN 0903-1936

flexible bronchoscopy in children. *Paediatr Anaesth*, Vol.20, No.9, (September 2010),

respond to medical therapy, has prolonged or recurrent seizures and low age.

bilateral and is associated with other craniofacial abnormalities facias.

procedure to define the extent of the stenosis.

pp 831-838, ISSN 1460-9592

**8. Acknowledgment** 

**9. References** 

including inversus situs, intestinal malrotation and cardiac malformations.

significantly. In more severe cases the tracheostomy is indicated.

common laryngeal tumor.

may be associated with stridor.

intubation.

subglottis.


**11** 

*China* 

**Manual Jet Ventilation Using** 

Shaoqing Li, Yuqi Liu and Fang Tan

**Manujet III for Bronchoscopic Airway** 

*The Eye, Ear, Nose and Throat Hospital, Fudan University, Shanghai* 

Aspiration of a foreign body (FB) into the airway was often a life-threatening event in children. A particular challenge to anesthesiologists was that the airway must be shared with the surgeon during FB removal. It was difficult to maintain adequate ventilation, oxygenation and anesthetic depth without disturbing the operation. Also, the methods of anesthetic management and modes of ventilation during bronchoscopic FB removal varied

Since the introduction of the rigid bronchoscope, the rate of successful removal of FB has increased dramatically and the safety of the operation has improved. However, Intraoperative or postoperative hypoxemia was still found to be the most frequent adverse event, and it could lead to a life-threatening outcome if not promptly treated. The occurrence of hypoxemia occurrence may depend on a variety of factors including the property of the FB, the surgeon's experience, anesthetic method, and patient's condition. Our study identified five factors that strongly correlated with increased rate of intraoperative hypoxemia: age of patient, plant seeds as FB, pneumonia before procedure,

Of all the factors related to hypoxemia or other complications in our study, ventilation mode was strongly associated with intraoperative hypoxemia. An extensive medical literature search revealed that the optimal ventilation mode during rigid bronchoscopy for FB removal is still actively controversial. In general, spontaneous ventilation(SV) was more popular and was advocated before the mid 1990s, whereas more recently reports in favor of control ventilation(CV) have appeared. In a review by Farrell, the advantages and disadvantages of SV and CV were discussed; however, no personal preference was suggested. Jet ventilation in rigid bronchoscopy was first introduced by Sanders in 1967. Since then, it has been modified and widely used in suspended laryngoscopy. Its use in pediatric FB removal has not been widely advocated. In our study, we developed a MJV method using Manujet III in which a small catheter was placed transnasally into the trachea for oxygen delivery. This technique produced fewer episodes of intraoperative hypoxemia than any other ventilation mode. The value of MJV became more pronounced when the bronchoscope had to be inserted distal to the FB. In this instance, ventilation became limited

**1. Introduction** 

greatly among institutions and anesthetists.

long duration of FB removal surgery, and ventilation mode.

**Foreign Body Removal in Children** 


## **Manual Jet Ventilation Using Manujet III for Bronchoscopic Airway Foreign Body Removal in Children**

Shaoqing Li, Yuqi Liu and Fang Tan *The Eye, Ear, Nose and Throat Hospital, Fudan University, Shanghai China* 

#### **1. Introduction**

200 Global Perspectives on Bronchoscopy

Newman, B. (1996). Left pulmonary artery sling: diagnosis and delineation of associated

Nicolai, T. The role of rigid and flexible bronchoscopy in children. *Paediatr Respir Rev*,

Passàli, D. (2010). Foreign body inhalation in children: a update. *Acta Otorhinolaryngol Ital,* 

Prakash, UBS & Holinger LD. (1994). Pediatric Rigid Bronchoscopy. In: *Bronchoscopy*, Udaya BS Prakash, pp 329-343, Raven Press, INSB 0-7817-0095-7, New York Regelmann, WE & Elliot, GR. (1993). Bronchoalveolar lavage. In: *Pediatric Respiratory Disease.* 

Riedler, J. (1995). Bronchoalveolar lavage cellularity in healthychildren. *Am J Respir Care* 

Saki, N. (2009). Foreign body aspirations in infancy: a 20-year experience. *Int J Med Sci*,

Sias, SMA. (2009). Clinical and Radiological Improvement of Lipoid Pulmonary with

Tunkel, DE & Zalzal, GH. (1992) Stridor in infants and children: ambulatory evaluation and

Visner, GA. Role of transbronchial biopsies in pediatric lung diseases. *Chest*, 126 No.1, (July

Wintrop, AL & Superina RA. (1990). The diagnosis of pneumonia in the

Wood, RE & Prakash, UBS. (1994). Pediatric Flexible Bronchoscopy. In*: Bronchoscopy*, Udaya BS Prakash, pp 345-356, Raven Press, INSB 0-7817-0095-7, New York Wood, RE & Prakash, UBS. (1994). Pediatric Flexible Bronchoscopy. In*: Bronchoscopy*, Prakash UBS, pp 345-356, Raven Press, INSB 0-7817-0095-7, New York Wood, RE. (1990). Pitfalls in the use of the flexible bronchoscope in pediatric patients. *Chest*,

Vol.12, No.3, (September 2011), pp 190-195. ISSN 1526-0550

*Med*, Vol152, No.1, (July 1995), pp 163-168, ISSN 1535-4970

Vol.6, N°6, (October, 2009), pp 322-328, INSS 1449-1907

Vol.30, No., (February, 2010), pp.27-32. INSS 1827-675X

1996), pp 661-668, ISSN 1432-1998

7216-4683-2, Philadelphia

15, ISSN 1099-0496

2004), pp 273-780, ISSN 0012-3692

No.8, (August 1990), pp 87-80, ISSN 1531-5037

Vol.97, No.1, (January 1990), pp 199-203, ISSN 0012-3692

0009-9228

tracheobronchiasl anomalies with MR. *Pediatr Radiol*, Vol.26, No.9, (September

*Diagnosis and treatment*. Hilman BC. pp 116-122, WB Saunders Company, ISBN 0-

Multiple Bronchoalveolar Lavage. *Ped Pulmonol*, Vol.44, No.4 , (April 2009), pp 309-

operative diagnosis. *Clin Pediatr (Phila)*, Vol.31, No.1, (January.1992), pp 48-55, ISSN

immunocompromised child: use of bronchoalveolar lavage*. J Pediatr Surg*, Vol.25,

Aspiration of a foreign body (FB) into the airway was often a life-threatening event in children. A particular challenge to anesthesiologists was that the airway must be shared with the surgeon during FB removal. It was difficult to maintain adequate ventilation, oxygenation and anesthetic depth without disturbing the operation. Also, the methods of anesthetic management and modes of ventilation during bronchoscopic FB removal varied greatly among institutions and anesthetists.

Since the introduction of the rigid bronchoscope, the rate of successful removal of FB has increased dramatically and the safety of the operation has improved. However, Intraoperative or postoperative hypoxemia was still found to be the most frequent adverse event, and it could lead to a life-threatening outcome if not promptly treated. The occurrence of hypoxemia occurrence may depend on a variety of factors including the property of the FB, the surgeon's experience, anesthetic method, and patient's condition. Our study identified five factors that strongly correlated with increased rate of intraoperative hypoxemia: age of patient, plant seeds as FB, pneumonia before procedure, long duration of FB removal surgery, and ventilation mode.

Of all the factors related to hypoxemia or other complications in our study, ventilation mode was strongly associated with intraoperative hypoxemia. An extensive medical literature search revealed that the optimal ventilation mode during rigid bronchoscopy for FB removal is still actively controversial. In general, spontaneous ventilation(SV) was more popular and was advocated before the mid 1990s, whereas more recently reports in favor of control ventilation(CV) have appeared. In a review by Farrell, the advantages and disadvantages of SV and CV were discussed; however, no personal preference was suggested. Jet ventilation in rigid bronchoscopy was first introduced by Sanders in 1967. Since then, it has been modified and widely used in suspended laryngoscopy. Its use in pediatric FB removal has not been widely advocated. In our study, we developed a MJV method using Manujet III in which a small catheter was placed transnasally into the trachea for oxygen delivery. This technique produced fewer episodes of intraoperative hypoxemia than any other ventilation mode. The value of MJV became more pronounced when the bronchoscope had to be inserted distal to the FB. In this instance, ventilation became limited

Manual Jet Ventilation Using Manujet III for

Endojet adaptor with Endojet catheter

**3. Manual Jet Ventilation (MJV)** 

**Connecting Tube**-100cm long with Luer Lock

**Endojet Adapter**-for connection to the Endotracheal Tube,15mm

the application of manual jet ventilation (MJV) in airway surgeries.

**Bronchoscope Adapter**-for connection to the rigid bronchoscope, 15mm

tube or laryngeal mask as far as required and can be fastened with the screw.

Bronchoscope adaptor

14G, 16G)

ready for use.

volume.

Bronchoscopic Airway Foreign Body Removal in Children 203

One of each Jet Ventilation catheter acc. to Ravussin for infant, child and adult(13G,

**Endojet Adaptor**-The Endojet adaptor allows jet ventilation on the endotracheal tube, laryngeal mask or face mask. The catheter can be pushed forward through the endotracheal

The features of Manujet III are: faster and simple, lightweight, portable and immediately

Since jet ventilation was first used in endolaryngeal procedures in 1971, there have been many improvements based on Sanders' ventilation technique. Based on the position of the catheter, jet ventilation can be categorized as follows: supraglottic jet ventilation, subglottic jet ventilation and percutaneous transtracheal jet ventilation. Based on the frequency, jet ventilation is also classified as low-frequency jet ventilation (LFJV that is administered at <60 times/minute) and high-frequency jet ventilation (HFJV that is administered at >60 times/minute). Because it can provide ventilation at low peak airway pressure, HFJV plays an important role in both airway surgeires and pulmonary protective ventilation, while LFJV is easily to be performed manually using a manual jet ventilator. This article reviews

Gas entrainment as a result of the "Venturi effect" is described in medical textbooks as the basis of jet ventilation. It is thought that the high-speed stream of gas directed into the airway by the jet nozzle causes a pressure gradient betwen the surrounding atmosphere and the gas stream, this pressure gradient drives the entrainment of the air in the surrounding atmosphere into the airway. However, Dr Ihra G believed that there was no "Venturi effect" in jet ventilation, because during jet application, positive pressures can be measured inside the jet stream and inside the injector. Other consideration involves that the pressurized jet stream causes an acceleration of the quiescent air, as a consequence the viscosity and friction between the moving and static layers of the air increases, thus drawing the surrounding air into the airway, resulting in the always larger actual tidal volume than the set shooting

MJV has several advantages over HFJV. MJV can be more easily performed as the MJV device and oxygen source are the only equipment required. The pressure and frequency of ventilation can be easily and instantaneously adjusted according to actual situation during the procedure. Another advantage of the MJV is that the frequency and inspiration/expiration ratio are both similar to physiological conditions, so that carbon dioxide expiration is easier. While, in HFJV, the positive end expiratory pressure (PEEP) caused by this technique benefits oxygenation but makes carbon dioxide expiration more

to the lung distal to the FB. In this situation, MJV became advantageous over the other ventilation modes, because MJV provided continuous ventilation in the noninvolved lung with a catheter separated from the bronchoscope. Thus, compared to other modes of ventilation, MJV significantly reduces the risk of hypoxemia.

This chapter was to narrate The Application and Possible Complications of manual jet ventilation using Manujet device for bronchoscopic removal of airway FBs in children, and discuss in detail the application and possible complication.

### **2. Manujet III**

The Manujet III (VBM Medizintechnik GmbH, Germany, Figure 1) is a portable and easily regulated device that can be used for manual jet ventilation with a low volume of mechanical dead space, is specially made for Jet Ventilation in circumstances of problem airways and can be used in areas that have a high pressure oxygen air outlet. If there is an acute obstruction of the upper airway, the Manujet, in connection with a Jet Ventilation catheter acc. Ravussin or the Endojet adaptor, allows the patient to be ventilated.

Fig. 1. The Manujet III device (from VBM medical, INC.)

the Manujet Includes:


Bronchoscope adaptor

202 Global Perspectives on Bronchoscopy

to the lung distal to the FB. In this situation, MJV became advantageous over the other ventilation modes, because MJV provided continuous ventilation in the noninvolved lung with a catheter separated from the bronchoscope. Thus, compared to other modes of

This chapter was to narrate The Application and Possible Complications of manual jet ventilation using Manujet device for bronchoscopic removal of airway FBs in children, and

The Manujet III (VBM Medizintechnik GmbH, Germany, Figure 1) is a portable and easily regulated device that can be used for manual jet ventilation with a low volume of mechanical dead space, is specially made for Jet Ventilation in circumstances of problem airways and can be used in areas that have a high pressure oxygen air outlet. If there is an acute obstruction of the upper airway, the Manujet, in connection with a Jet Ventilation

> **Pressure Hose** - 4m long

a central source or O2 cylinder

**Gauge** - color coded - pressure in bar and psi


catheter acc. Ravussin or the Endojet adaptor, allows the patient to be ventilated.

ventilation, MJV significantly reduces the risk of hypoxemia.

discuss in detail the application and possible complication.

**Trigger** - manual activation

**Connecting** 


**Tube**

**Pressure Regulator** - adjustable between 0 - 3.5 bar (0 - 50


 Case with 4 m pressure hose Luer lock connecting tube

Fig. 1. The Manujet III device (from VBM medical, INC.)

psi)

the Manujet Includes:

**2. Manujet III** 


**Connecting Tube**-100cm long with Luer Lock

**Endojet Adapter**-for connection to the Endotracheal Tube,15mm

**Bronchoscope Adapter**-for connection to the rigid bronchoscope, 15mm

**Endojet Adaptor**-The Endojet adaptor allows jet ventilation on the endotracheal tube, laryngeal mask or face mask. The catheter can be pushed forward through the endotracheal tube or laryngeal mask as far as required and can be fastened with the screw.

The features of Manujet III are: faster and simple, lightweight, portable and immediately ready for use.

#### **3. Manual Jet Ventilation (MJV)**

Since jet ventilation was first used in endolaryngeal procedures in 1971, there have been many improvements based on Sanders' ventilation technique. Based on the position of the catheter, jet ventilation can be categorized as follows: supraglottic jet ventilation, subglottic jet ventilation and percutaneous transtracheal jet ventilation. Based on the frequency, jet ventilation is also classified as low-frequency jet ventilation (LFJV that is administered at <60 times/minute) and high-frequency jet ventilation (HFJV that is administered at >60 times/minute). Because it can provide ventilation at low peak airway pressure, HFJV plays an important role in both airway surgeires and pulmonary protective ventilation, while LFJV is easily to be performed manually using a manual jet ventilator. This article reviews the application of manual jet ventilation (MJV) in airway surgeries.

Gas entrainment as a result of the "Venturi effect" is described in medical textbooks as the basis of jet ventilation. It is thought that the high-speed stream of gas directed into the airway by the jet nozzle causes a pressure gradient betwen the surrounding atmosphere and the gas stream, this pressure gradient drives the entrainment of the air in the surrounding atmosphere into the airway. However, Dr Ihra G believed that there was no "Venturi effect" in jet ventilation, because during jet application, positive pressures can be measured inside the jet stream and inside the injector. Other consideration involves that the pressurized jet stream causes an acceleration of the quiescent air, as a consequence the viscosity and friction between the moving and static layers of the air increases, thus drawing the surrounding air into the airway, resulting in the always larger actual tidal volume than the set shooting volume.

MJV has several advantages over HFJV. MJV can be more easily performed as the MJV device and oxygen source are the only equipment required. The pressure and frequency of ventilation can be easily and instantaneously adjusted according to actual situation during the procedure. Another advantage of the MJV is that the frequency and inspiration/expiration ratio are both similar to physiological conditions, so that carbon dioxide expiration is easier. While, in HFJV, the positive end expiratory pressure (PEEP) caused by this technique benefits oxygenation but makes carbon dioxide expiration more

Manual Jet Ventilation Using Manujet III for

**foreign body removal in children** 

**3.1.1.1 Patients and methods** 

adequate ventilation.

patients.

Bronchoscopic Airway Foreign Body Removal in Children 205

during the process of bronchoscope placement, which provides surgeons with ease in placing the bronchoscope. Constant and steady ventilation can also be achieved in the noninvolved lung via a catheter separated from the bronchoscope when it is inserted into the distal side of bronchi of the involved lung. Even after the bronchoscope is removed, this technique can still provide jet ventilation until spontaneous respiration is restored in these

**3.1.1 Efficacy of manual jet ventilation using Manujet III for bronchoscopic airway** 

while surgeons and anesthetists were not blinded in the study.

**3.1.1.2 Management of anesthesia and ventilation** 

Approval was obtained from the hospital's Human Research Committee prior to the study. The study was carried out from February of 2005 to June of 2009. A total of 360 children, ASA I or II, aged from 10 months to 12 years, weighing 8–35 kg, who required removal of an airway FB were enrolled in the study. All surgical manipulations were performed with Karl-Storz rigid bronchoscopes under general anesthesia. Informed consent was obtained from parents or legal guardians before the initiation of anesthetic and surgical procedure. Exclusion criteria included: (1) inability to obtain parental consent, (2) no foreign body found by bronchoscopy, and (3) absence of spontaneous breathing, cyanosis, or SpO2 <90% was detected prior to the operation. The presence of a supraglottic/glottic foreign body suggested by clinical symptoms and chest radiography findings or confirmed by laryngoscopy was also excluded from the study. The data were collected in the operating room and ward. Each outcome was observed under the same set of conditions and recorded at same time to avoid bias. Participants were blinded, observers were partially blinded,

Atropine (0.01 mg/kg) and methylprednisolone (2 mg/kg) was given intravenously to all patients before anesthetic induction. Patients were randomly divided into three groups (n = 120). In group S, anesthesia was induced with propofol (2 mg/kg) and ghydroxybutyrate sodium (70 mg/kg) and maintained by bolus administration of 1–2 mg/kg propofol as needed. The patient was allowed to breathe spontaneously at this level of anesthesia. Following successful insertion of a rigid bronchoscope, pure oxygen was delivered at a flow rate of 8 L/min by connecting the respiratory circuit to the side arm of the bronchoscope.

In Group P, anesthesia was induced with propofol (4–5 mg/kg), fentanyl (1–2 mg/kg) and succinylcholine (2 mg/kg) and maintained by bolus administration of 1–2 mg/kg propofol and 2 mg/kg succinylcholine as needed. The respiratory circuit was connected to the side arm of the bronchoscope and manual intermittent positive pressure ventilation (IPPV) was performed at the rate of 16–35 ventilations/min. A larger than normal tidal volume was delivered to offset the leakage of oxygen through the open eye piece of bronchoscope. The chest wall movement of the patients was closely observed to assure

In group J, patients received the same anesthetic protocol as in Group P. A small catheter was inserted transnasally into the trachea under the guidance of a laryngoscope and connected to the Manujet III device. Jet ventilation was manually controlled throughout the operation with

difficult. In some cases, the increase in respiratory frequency may result in a decrease in alveolar ventilation. Vourc'h, et al made a comparison of MJV (20 times/minute) with HFJV (300 times/minute) which were used in tracheobronchial stenosis patients who received laser surgery under general anesthesia. Within the first 10 minutes of the operation, there was no significant difference between the two ventilation techniques as determined by blood gas analysis. However, those patients who received HFJV suffered from mild hypercapnia. It was thought that MJV is suitable better choice for patients who had tracheobronchial stenosis.

#### **3.1 The application of MJV using Manujet III in rigid bronchoscopy for FB removal**

MJV has been rarely reported to be used in airway foreign body removal. In our hospital, MJV using Manujet III has been applied in tracheobronchial foreign body removal in more than 2000 cases with satisfactory results since 2004. Our latest report concluded that, in addition to the fact that MJV provided a good condition for bronchoscopic manipulation, the occurrence of hypoxia during the operation was decreased. This conclusion was drawn after a comparison of the three ventilation techniques in 360 cases had been made; the techniques studied included spontaneous respiration, mechanically controlled ventilation and MJV. The effectiveness of the above three techniques were compared in the study with additional information including compliance to bronchoscope placement, successful rate of foreign body removal, occurrence of hypoxia and etc. From another study done by our group involving 384 patients, we concluded that the ventilation method was one of the risk factors in causing intraoperative hypoxemia. Specifically, spontaneous respiration tended to increase the occurrence of hypoxemia, while MJV decreased the occurrence. To perform this ventilation technique, a catheter (1.5 mm in I.D.) was placed transnasally into the trachea under the guidance of a laryngoscope and connected to the Manu-jet device (Figure 2) after anesthesia induction. Jet ventilation was manually controlled throughout the operation with the driving pressure of 15 psi in children aged less than 12 months or 15–35 psi (usually less than 25 psi) in children aged more than 1 year at a frequency of 20–35 times/minute. One outstanding advantage of this ventilation method is that the ventilation route is separate from the route used for bronchoscopy. This method can provide a steady oxygen supply

Fig. 2. Manual jet ventilation during FB removal: a small catheter (ID=1.5mm) was inserted transnasally into the trachea and connected to Manu-jet device during rigid bronchoscopy.

during the process of bronchoscope placement, which provides surgeons with ease in placing the bronchoscope. Constant and steady ventilation can also be achieved in the noninvolved lung via a catheter separated from the bronchoscope when it is inserted into the distal side of bronchi of the involved lung. Even after the bronchoscope is removed, this technique can still provide jet ventilation until spontaneous respiration is restored in these patients.

#### **3.1.1 Efficacy of manual jet ventilation using Manujet III for bronchoscopic airway foreign body removal in children**

#### **3.1.1.1 Patients and methods**

204 Global Perspectives on Bronchoscopy

difficult. In some cases, the increase in respiratory frequency may result in a decrease in alveolar ventilation. Vourc'h, et al made a comparison of MJV (20 times/minute) with HFJV (300 times/minute) which were used in tracheobronchial stenosis patients who received laser surgery under general anesthesia. Within the first 10 minutes of the operation, there was no significant difference between the two ventilation techniques as determined by blood gas analysis. However, those patients who received HFJV suffered from mild hypercapnia. It was thought that MJV is suitable better choice for patients who had

**3.1 The application of MJV using Manujet III in rigid bronchoscopy for FB removal** 

MJV has been rarely reported to be used in airway foreign body removal. In our hospital, MJV using Manujet III has been applied in tracheobronchial foreign body removal in more than 2000 cases with satisfactory results since 2004. Our latest report concluded that, in addition to the fact that MJV provided a good condition for bronchoscopic manipulation, the occurrence of hypoxia during the operation was decreased. This conclusion was drawn after a comparison of the three ventilation techniques in 360 cases had been made; the techniques studied included spontaneous respiration, mechanically controlled ventilation and MJV. The effectiveness of the above three techniques were compared in the study with additional information including compliance to bronchoscope placement, successful rate of foreign body removal, occurrence of hypoxia and etc. From another study done by our group involving 384 patients, we concluded that the ventilation method was one of the risk factors in causing intraoperative hypoxemia. Specifically, spontaneous respiration tended to increase the occurrence of hypoxemia, while MJV decreased the occurrence. To perform this ventilation technique, a catheter (1.5 mm in I.D.) was placed transnasally into the trachea under the guidance of a laryngoscope and connected to the Manu-jet device (Figure 2) after anesthesia induction. Jet ventilation was manually controlled throughout the operation with the driving pressure of 15 psi in children aged less than 12 months or 15–35 psi (usually less than 25 psi) in children aged more than 1 year at a frequency of 20–35 times/minute. One outstanding advantage of this ventilation method is that the ventilation route is separate from the route used for bronchoscopy. This method can provide a steady oxygen supply

Fig. 2. Manual jet ventilation during FB removal: a small catheter (ID=1.5mm) was inserted transnasally into the trachea and connected to Manu-jet device during rigid bronchoscopy.

tracheobronchial stenosis.

Approval was obtained from the hospital's Human Research Committee prior to the study. The study was carried out from February of 2005 to June of 2009. A total of 360 children, ASA I or II, aged from 10 months to 12 years, weighing 8–35 kg, who required removal of an airway FB were enrolled in the study. All surgical manipulations were performed with Karl-Storz rigid bronchoscopes under general anesthesia. Informed consent was obtained from parents or legal guardians before the initiation of anesthetic and surgical procedure. Exclusion criteria included: (1) inability to obtain parental consent, (2) no foreign body found by bronchoscopy, and (3) absence of spontaneous breathing, cyanosis, or SpO2 <90% was detected prior to the operation. The presence of a supraglottic/glottic foreign body suggested by clinical symptoms and chest radiography findings or confirmed by laryngoscopy was also excluded from the study. The data were collected in the operating room and ward. Each outcome was observed under the same set of conditions and recorded at same time to avoid bias. Participants were blinded, observers were partially blinded, while surgeons and anesthetists were not blinded in the study.

#### **3.1.1.2 Management of anesthesia and ventilation**

Atropine (0.01 mg/kg) and methylprednisolone (2 mg/kg) was given intravenously to all patients before anesthetic induction. Patients were randomly divided into three groups (n = 120). In group S, anesthesia was induced with propofol (2 mg/kg) and ghydroxybutyrate sodium (70 mg/kg) and maintained by bolus administration of 1–2 mg/kg propofol as needed. The patient was allowed to breathe spontaneously at this level of anesthesia. Following successful insertion of a rigid bronchoscope, pure oxygen was delivered at a flow rate of 8 L/min by connecting the respiratory circuit to the side arm of the bronchoscope.

In Group P, anesthesia was induced with propofol (4–5 mg/kg), fentanyl (1–2 mg/kg) and succinylcholine (2 mg/kg) and maintained by bolus administration of 1–2 mg/kg propofol and 2 mg/kg succinylcholine as needed. The respiratory circuit was connected to the side arm of the bronchoscope and manual intermittent positive pressure ventilation (IPPV) was performed at the rate of 16–35 ventilations/min. A larger than normal tidal volume was delivered to offset the leakage of oxygen through the open eye piece of bronchoscope. The chest wall movement of the patients was closely observed to assure adequate ventilation.

In group J, patients received the same anesthetic protocol as in Group P. A small catheter was inserted transnasally into the trachea under the guidance of a laryngoscope and connected to the Manujet III device. Jet ventilation was manually controlled throughout the operation with

Manual Jet Ventilation Using Manujet III for

Duration of foreign body in the

Location of the foreign body (n)

Duration of emergence from

Percentage of cases with foreign body

\*P<0.05 versus Group S; †P<0.05 versus Group P.

Parameters presented as mean±SD.

anesthesia (min)

removal (%)

were comparable among the three groups.

Bronchoscopic Airway Foreign Body Removal in Children 207

Sex (male/female) 81/39 74/46 83/37 Age (months) 17 (22–36) 17 (14–24) 20 (14–24) Weight (kg) 14±3 13±4 14±4

airway (days) 3 (1–11) 3 (1–9) 3 (1–7)

main 9 13 11 left 53 51 49 right 57 53 58 both 1 3 2

Table 1. Clinical characteristics of the patients (n = 120 per group). Parameters presented as mean±SD. Data structure of each group was identical; demographic and epidemiologic data

Successful bronchoscope insertion (%) 70.8 97.5\* 98.3\* Duration of operation (min) 29.1±6.2 16.7±2.1\* 15.2±2.2\*

Intraoperative hypoxemia (%) 40.8 16.7\* 2.5\*† Postoperative hypoxemia (%) 19.2 6.7\* 4.2\* Body movement during operation (%) 73.3 17.5 10.8\* Perioperative side effects (%) 34.2 10.8\* 9.2\* Laryngospasm(cases) 5 1 1 Arrhythmia(cases) 3 2 0 Breath holding(cases) 21 11 9 Restlessness(cases) 13 8 9 other(cases) 7 4 3

Table 2. Clinical characteristics of surgery for the three groups (n = 120 per group).

insertions, higher incidences of hypoxemia and perioperative adverse events and a longer operation times. We speculated that the cause for these findings was due to an inadequate depth of anesthesia in group S. Lighter anesthesia would make a patient's airway more sensitive and reactive to the presence of the bronchoscope, frequently leading to

Group S Group P Group J

Group S Group P Group J

32.7±6.8 9.1±2.4\* 9.2±2.0\*

90.8 92.5 96.7

the driving pressure of 0.6–1 bar in children aged less than 12 months or 1–2.5 bar in children aged more than 1 year (1 bar = 105 Pa) at a frequency of 20–35 ventilations/min. The effectiveness of ventilation was assessed by degree of chest excursion. After the FB removal, spontaneous respiration or assisted ventilation was maintained through a facemask in Groups S and P. In Group J, the jet catheter was kept in the trachea and jet ventilation was continued until spontaneous respiration resumed.

Prior to the start of the insertion of bronchoscope, 1% lidocaine aerosol was sprayed over the epiglottis using laryngoscopic guidance in all groups of patients.

#### **3.1.1.3 Measurements**

The condition for insertion of bronchoscope was regarded as satisfactory when the bronchoscope was inserted successfully on the first attempt with a clear view of the glottis and without patient's body movement or bucking. Hypoxemia was defined as a decrease in pulse oxygen saturation (SpO2) < 90% for >5 s.

Beside the baseline medical conditions and condition that required the procedure, the following information was recorded for each patient: successful insertion of bronchoscope on the first attempt, occurrence of hypoxemia during bronchoscopy and after withdrawing the bronchoscope, successful rate of FB removal, the duration of the operation, the time of emergence and recovery from anesthesia, and perioperative side effects including laryngospasm, arrhythmias, breath holding, and post-op restlessness. Patients were discharged from this study if no foreign body was found during the operation. If the presence of a foreign body was confirmed but could not be removed in the first attempt of bronchoscopy, a second attempt was made 3–5 days later, and a thoracotomy should be taken after two times of unsuccessful bronchoscopy. The ventilation mode and anesthetic technique for the second bronchoscopy were chosen based on the anesthetist's preference, and, in some cases, on the surgeon's preference. In those cases, only the first attempt was included in the study and was classified as unsuccessful foreign body removal. Whether the second attempt was successful or not, the patient was not included in the study. No thoracotomy was performed in the study.

#### **3.1.1.4 Results**

The data structure of each group was identical, and demographic and epidemiologic data were comparable among the three groups (Table 1). Table 2 presents the clinical and surgical data for the three groups. Compared with group S, groups P and J showed significantly higher success rates of bronchoscope insertion on the first attempt, lower rates of intra- and post-operative hypoxemia, lower rates of perioperative complications, shorter durations of operation, and faster recoveries and emergence from anesthesia (P < 0.05). The incidences of hypoxemiawere lower in Group J comparedwith that in Group P (2.5% versus 16.7%,P < 0.05). There were no significant differences among groups for the other data that were collected.

#### **3.1.1.5 Discussion**

In the current study, three types of ventilation methods were compared in patients undergoing rigid bronchoscopy for airway FB removal. We found that the patients with spontaneous breathing during the procedure had lower success rates for bronchoscope


Table 1. Clinical characteristics of the patients (n = 120 per group). Parameters presented as mean±SD. Data structure of each group was identical; demographic and epidemiologic data were comparable among the three groups.


\*P<0.05 versus Group S; †P<0.05 versus Group P.

Table 2. Clinical characteristics of surgery for the three groups (n = 120 per group). Parameters presented as mean±SD.

insertions, higher incidences of hypoxemia and perioperative adverse events and a longer operation times. We speculated that the cause for these findings was due to an inadequate depth of anesthesia in group S. Lighter anesthesia would make a patient's airway more sensitive and reactive to the presence of the bronchoscope, frequently leading to

206 Global Perspectives on Bronchoscopy

the driving pressure of 0.6–1 bar in children aged less than 12 months or 1–2.5 bar in children aged more than 1 year (1 bar = 105 Pa) at a frequency of 20–35 ventilations/min. The effectiveness of ventilation was assessed by degree of chest excursion. After the FB removal, spontaneous respiration or assisted ventilation was maintained through a facemask in Groups S and P. In Group J, the jet catheter was kept in the trachea and jet

Prior to the start of the insertion of bronchoscope, 1% lidocaine aerosol was sprayed over the

The condition for insertion of bronchoscope was regarded as satisfactory when the bronchoscope was inserted successfully on the first attempt with a clear view of the glottis and without patient's body movement or bucking. Hypoxemia was defined as a decrease in

Beside the baseline medical conditions and condition that required the procedure, the following information was recorded for each patient: successful insertion of bronchoscope on the first attempt, occurrence of hypoxemia during bronchoscopy and after withdrawing the bronchoscope, successful rate of FB removal, the duration of the operation, the time of emergence and recovery from anesthesia, and perioperative side effects including laryngospasm, arrhythmias, breath holding, and post-op restlessness. Patients were discharged from this study if no foreign body was found during the operation. If the presence of a foreign body was confirmed but could not be removed in the first attempt of bronchoscopy, a second attempt was made 3–5 days later, and a thoracotomy should be taken after two times of unsuccessful bronchoscopy. The ventilation mode and anesthetic technique for the second bronchoscopy were chosen based on the anesthetist's preference, and, in some cases, on the surgeon's preference. In those cases, only the first attempt was included in the study and was classified as unsuccessful foreign body removal. Whether the second attempt was successful or not, the patient was not included in the study. No

The data structure of each group was identical, and demographic and epidemiologic data were comparable among the three groups (Table 1). Table 2 presents the clinical and surgical data for the three groups. Compared with group S, groups P and J showed significantly higher success rates of bronchoscope insertion on the first attempt, lower rates of intra- and post-operative hypoxemia, lower rates of perioperative complications, shorter durations of operation, and faster recoveries and emergence from anesthesia (P < 0.05). The incidences of hypoxemiawere lower in Group J comparedwith that in Group P (2.5% versus 16.7%,P < 0.05). There were no significant differences among groups for the other data that were

In the current study, three types of ventilation methods were compared in patients undergoing rigid bronchoscopy for airway FB removal. We found that the patients with spontaneous breathing during the procedure had lower success rates for bronchoscope

ventilation was continued until spontaneous respiration resumed.

epiglottis using laryngoscopic guidance in all groups of patients.

pulse oxygen saturation (SpO2) < 90% for >5 s.

thoracotomy was performed in the study.

**3.1.1.4 Results** 

collected.

**3.1.1.5 Discussion** 

**3.1.1.3 Measurements** 

Manual Jet Ventilation Using Manujet III for

Bronchoscopic Airway Foreign Body Removal in Children 209

Barotrauma is the most severe complication associated with jet ventilation. Blockage of airway outflow and trauma on the tracheal mucosa are the two most common causes of barotraumas. In the current study, no cases of barotrauma were observed when Manujet III was used. However, Manujet III has the potential to aggravate an existing pneumothorax because of the high pressure of airflow; the patient should be closely monitored and the necessary preventive strategies should be applied. First, a smaller jet catheter should be used to avoid blocking the airway outflow and disturbing the surgical procedure. Second, the location and position of catheter should be checked frequently to prevent it from slipping deeper, and preventing air accumulation caused by severe bronchotracheal occlusion. Third, the jet of the Manujet should be manipulated by the Manujet operator in a pattern of slow jetting-quick release using a high frequency and a low driving pressure. Finally, successful jet ventilation is highly operatordependent and should be done by experienced attendant anesthesiologists or residents under the guidance of attendants.

Manual jet ventilation with Manujet III has become the standard technique in our hospital for FB removal by rigid bronchoscopy. There are several advantages in using this device: (1) it provides continuous ventilation during all steps of the procedure;(2) it avoids inadequate ventilationto aunilateral lungwhenthe bronchoscope is inserted distal to the FB;(3) it shortens the duration of operation and emergence from anesthesia; (4) spontaneous respiration is possible because of the minimal stimulation by a small transnasal catheter and a manually controlled ventilation mode adaptable to patients' status of respiration; and (5) it minimizes the post-operative hypoxemia by decreasing bucking, coughing, or laryngospasm induced by oral secretions accumulated under the glottis if ventilated through mask during the emergence from anesthesia. In cases with a supraglottic/glottic foreign body, manual jet ventilation is not suggested, while in cases with bilateral bronchus obstruction, jet ventilation should be cautiously usedwhile keeping the catheter in themain tracheal airway. Although it is impossible to detect the end tidal CO2 levels in an open airway during rigid bronchoscopy, CO2 retention has not been a problem according to our previous study using jet ventilation with a frequency of 20–60 ventilations/min in suspension laryngoscopy.

In conclusion, manual jet ventilation using Manujet III is a safe and effective technique for airway FB removal by rigid bronchoscopy in children. It offers more favorable outcomes when compared with spontaneous respiration. Attention should be paid to carefully observe the chest excursion of the patients for the assessment of the efficiency of jet ventilation and to check the location of the catheter to avoid barotrauma caused by bronchotracheal occlusion.

Delayed diagnosis in AFB aspiration in children leads to prolonged foreign body retention in the brochus, causing pathological changes in the lungs, such as pneumonia, bronchitis, emphysema, breathing difficulties, asthma, choking, etc. The longer the foreign body retention, the more the respiratory problems and aggravated pathological changes, which have increased the risk of foreign body removal surgery, particularly the incidence of

We reviewed the records of all children who underwent the removal of airway foreign bodies(FBs) using rigid bronchoscopy in our Eye and ENT hospital between June 2004 and

**3.1.2 MJV using Manujet III to removal long retained airway FB** 

intraoperative hypoxia

**3.1.2.1 Materials and method** 

bronchospasm, breath-holding and bucking. Deeper anesthesia increases the risk of inhibiting respiration or causing shallow respiration. All of these factors may have contributed to the higher incidence of hypoxemia in group S. The duration of the operation was also significantly longer in group S because extra time was needed for frequent adjustment of the depth of anesthesia or management of complications. In contrast, the controlled ventilation techniques used in groups P and J provided a good anesthetic status for surgery, and the muscle relaxation caused by succinylcholine gave a further advantage for bronchoscope manipulation. Therefore, decreased rate of complications and reduced duration of operation were observed in both groups P and J.

Jet ventilation during rigid bronchoscopy was first introduced by Sanders. Since then, it has been modified and is now widely used in suspension laryngoscopy. The route used for jet ventilation can be classified as either intratracheal jet ventilation (ITJV) or supraglottic jet ventilation (SJV). Both have a low incidence of complications when compared with traditional jet ventilation. Neither ITJV nor SJV are widely advocated in pediatric airway FB removal. From a practical point of view, SJV is unlikely to be attached to a rigid bronchoscope because of the incompatibility of the instruments. ITJV can be performed through the lateral aperture of the rigid bronchoscope by propelling air through the lumen of the bronchoscope. In the case, however, that the bronchoscope must be inserted distally to the FB, ventilation through the bronchoscope becomes limited to the bronchus, which is actually obstructed by the FB. In this situation, jet ventilation via the bronchoscope will be much less efficient and hypoventilation may occur quickly. To circumvent this problem in this study, we used a modified catheter that was connected directly to Manujet III, and was placed transnasally into the trachea; therefore, the jet ventilation and the bronchoscopic procedures were performed separately. This design made continuous ventilation to the nonobstructed lung or both lungs possible because the tip of the catheter was placed in the trachea, and did not interfere with bronchoscopic operation. The advantage of this method is that it can provide continuous ventilation to the clear lung with a catheter separate from the bronchoscope. This was confirmed by results from the present study in which the incidence of hypoxemia was lower in Group J than in Group P. Another advantage of the MJV is that it can offer unhurried conditions for bronchoscope insertion while continuous ventilation takes place through the transnasal catheter. This method appears superior to the IPPV method, in which the delay in initiating artificial ventilation is likely to be too long to maintain adequate oxygen saturation if the bronchoscope is not inserted successfully on the first or second attempt.

The use of transtracheal manual jet ventilation has been suggested for emergent airway management in the "can't intubate, can't ventilate" scenario described in the "Failed Ventilation Guidelines" formulated by "The Difficult Airway Society" Manujet III is a device widely used in emergency departments, intensive care units, recovery rooms and operating rooms for patients needing emergency ventilation. We utilize this kind of device for bronchoscopic foreign body removal. The device sprays hyperbaric oxygen into the airway through the jet catheter, and at the same time, air around the jet oxygen flow is also driven into the airway because of the "Venturi" effect. The final tidal volume is composed of the jet oxygen flow and its surrounding air flow. The highest oxygen pressure designed for this device can reach to 3 bar (300kPa). The driving pressure of the jet flow can be regulated as needed. The recommended driving pressure is dependent on the age of the patient: 0.1–1 bar for infants, 1–2.5 bar for children and 2.5–3.5 bar for adults.

bronchospasm, breath-holding and bucking. Deeper anesthesia increases the risk of inhibiting respiration or causing shallow respiration. All of these factors may have contributed to the higher incidence of hypoxemia in group S. The duration of the operation was also significantly longer in group S because extra time was needed for frequent adjustment of the depth of anesthesia or management of complications. In contrast, the controlled ventilation techniques used in groups P and J provided a good anesthetic status for surgery, and the muscle relaxation caused by succinylcholine gave a further advantage for bronchoscope manipulation. Therefore, decreased rate of complications and reduced

Jet ventilation during rigid bronchoscopy was first introduced by Sanders. Since then, it has been modified and is now widely used in suspension laryngoscopy. The route used for jet ventilation can be classified as either intratracheal jet ventilation (ITJV) or supraglottic jet ventilation (SJV). Both have a low incidence of complications when compared with traditional jet ventilation. Neither ITJV nor SJV are widely advocated in pediatric airway FB removal. From a practical point of view, SJV is unlikely to be attached to a rigid bronchoscope because of the incompatibility of the instruments. ITJV can be performed through the lateral aperture of the rigid bronchoscope by propelling air through the lumen of the bronchoscope. In the case, however, that the bronchoscope must be inserted distally to the FB, ventilation through the bronchoscope becomes limited to the bronchus, which is actually obstructed by the FB. In this situation, jet ventilation via the bronchoscope will be much less efficient and hypoventilation may occur quickly. To circumvent this problem in this study, we used a modified catheter that was connected directly to Manujet III, and was placed transnasally into the trachea; therefore, the jet ventilation and the bronchoscopic procedures were performed separately. This design made continuous ventilation to the nonobstructed lung or both lungs possible because the tip of the catheter was placed in the trachea, and did not interfere with bronchoscopic operation. The advantage of this method is that it can provide continuous ventilation to the clear lung with a catheter separate from the bronchoscope. This was confirmed by results from the present study in which the incidence of hypoxemia was lower in Group J than in Group P. Another advantage of the MJV is that it can offer unhurried conditions for bronchoscope insertion while continuous ventilation takes place through the transnasal catheter. This method appears superior to the IPPV method, in which the delay in initiating artificial ventilation is likely to be too long to maintain adequate oxygen saturation if the bronchoscope is not inserted successfully on the

The use of transtracheal manual jet ventilation has been suggested for emergent airway management in the "can't intubate, can't ventilate" scenario described in the "Failed Ventilation Guidelines" formulated by "The Difficult Airway Society" Manujet III is a device widely used in emergency departments, intensive care units, recovery rooms and operating rooms for patients needing emergency ventilation. We utilize this kind of device for bronchoscopic foreign body removal. The device sprays hyperbaric oxygen into the airway through the jet catheter, and at the same time, air around the jet oxygen flow is also driven into the airway because of the "Venturi" effect. The final tidal volume is composed of the jet oxygen flow and its surrounding air flow. The highest oxygen pressure designed for this device can reach to 3 bar (300kPa). The driving pressure of the jet flow can be regulated as needed. The recommended driving pressure is dependent on the age of the patient: 0.1–1

bar for infants, 1–2.5 bar for children and 2.5–3.5 bar for adults.

duration of operation were observed in both groups P and J.

first or second attempt.

Barotrauma is the most severe complication associated with jet ventilation. Blockage of airway outflow and trauma on the tracheal mucosa are the two most common causes of barotraumas. In the current study, no cases of barotrauma were observed when Manujet III was used. However, Manujet III has the potential to aggravate an existing pneumothorax because of the high pressure of airflow; the patient should be closely monitored and the necessary preventive strategies should be applied. First, a smaller jet catheter should be used to avoid blocking the airway outflow and disturbing the surgical procedure. Second, the location and position of catheter should be checked frequently to prevent it from slipping deeper, and preventing air accumulation caused by severe bronchotracheal occlusion. Third, the jet of the Manujet should be manipulated by the Manujet operator in a pattern of slow jetting-quick release using a high frequency and a low driving pressure. Finally, successful jet ventilation is highly operatordependent and should be done by experienced attendant anesthesiologists or residents under the guidance of attendants.

Manual jet ventilation with Manujet III has become the standard technique in our hospital for FB removal by rigid bronchoscopy. There are several advantages in using this device: (1) it provides continuous ventilation during all steps of the procedure;(2) it avoids inadequate ventilationto aunilateral lungwhenthe bronchoscope is inserted distal to the FB;(3) it shortens the duration of operation and emergence from anesthesia; (4) spontaneous respiration is possible because of the minimal stimulation by a small transnasal catheter and a manually controlled ventilation mode adaptable to patients' status of respiration; and (5) it minimizes the post-operative hypoxemia by decreasing bucking, coughing, or laryngospasm induced by oral secretions accumulated under the glottis if ventilated through mask during the emergence from anesthesia. In cases with a supraglottic/glottic foreign body, manual jet ventilation is not suggested, while in cases with bilateral bronchus obstruction, jet ventilation should be cautiously usedwhile keeping the catheter in themain tracheal airway. Although it is impossible to detect the end tidal CO2 levels in an open airway during rigid bronchoscopy, CO2 retention has not been a problem according to our previous study using jet ventilation with a frequency of 20–60 ventilations/min in suspension laryngoscopy.

In conclusion, manual jet ventilation using Manujet III is a safe and effective technique for airway FB removal by rigid bronchoscopy in children. It offers more favorable outcomes when compared with spontaneous respiration. Attention should be paid to carefully observe the chest excursion of the patients for the assessment of the efficiency of jet ventilation and to check the location of the catheter to avoid barotrauma caused by bronchotracheal occlusion.

#### **3.1.2 MJV using Manujet III to removal long retained airway FB**

Delayed diagnosis in AFB aspiration in children leads to prolonged foreign body retention in the brochus, causing pathological changes in the lungs, such as pneumonia, bronchitis, emphysema, breathing difficulties, asthma, choking, etc. The longer the foreign body retention, the more the respiratory problems and aggravated pathological changes, which have increased the risk of foreign body removal surgery, particularly the incidence of intraoperative hypoxia

#### **3.1.2.1 Materials and method**

We reviewed the records of all children who underwent the removal of airway foreign bodies(FBs) using rigid bronchoscopy in our Eye and ENT hospital between June 2004 and

Manual Jet Ventilation Using Manujet III for

Table 3. Distribution of patients

**Complaints** 

**Radiological findings** 

Exceed 30 days 67

Bronchoscopic Airway Foreign Body Removal in Children 211

From rural 56 83.58% From urban 11 16.42% No FB history 46 68.66% FB history 21 31.34% Organic FB 57 85.07% Left 36 53.73% Right 31 46.27%

Repeatedly fever 42 62.69% Chronic cough 39 58.21% wheezing 18 26.87% appetite depress 13 19.40% long-term vomiting 3 4.48% dyspnea 9 13.43% cyanosis 3 4.48% vomica 3 4.48% cutaneous emphysema 2 2.99% no complaint 5 7.46% exceed onecomplaint 43 64.18%

emphysema 23 34.33% pneumonia 17 25.37% bronchitis 16 23.88 atelectasis 12 17.91% mediastinal swaying 3 4.48% lung abscess 1 1.49% No radiological findings 19 28.36%

Table 4. Complaints and radiological findings before operation

Number(cases) percentage

Number(cases) Percentage

September 2008. The patients whose time from FBs aspiration to retrieval exceed 30 days were admitted into our study. The subjects who underwent MJV using Manujet III constituted for Group m, and those who underwent ventilation through lateral aperture of rigid bronchoscopy were Group n, and the narcotic drugs must be identical in Group m and Group n. To analyze the distribution of patients and complications before operation, to analyze the incidence of hypoxemia during and after the operation, to analyze the rate of success of FB removal, to analyze the duration of operation and emergence from anesthesia and the other perioperative side effects.

#### **3.1.2.2 Results**

From June 2004 to September 2008, there were 1263 patients who were subjected to FB removal. Among them, 67 children (5.30%) accorded to our study qualification, age ranging from 9 months to 131 months (median 25 months), weight ranging 9~33kg (median 13kg), ASA I~III,The duration of FB aspiration was 30days to 370 days (median 87days). 46 children (68.66%) with no FB history, in others 21 (31.34%) cases with positive clinical history( but not chest film findings, or not early symptoms or negative bronchoscopy findings). There was no signification difference between Group m and Group n about the distribution of patients and complications before operation, The incidence of hypoxemia during operation was lower in Group m than in Group n (P<0.05), and the duration of operation and emergence from anesthesia were shorter in Group m than in Group n (P<0.05). There was no significant difference in other compared factors (P>0.05) (see Table 3,4,5).

#### Fig. 3. Complaints before operation

Fig. 4. Radiological findings before operation


Table 3. Distribution of patients

210 Global Perspectives on Bronchoscopy

September 2008. The patients whose time from FBs aspiration to retrieval exceed 30 days were admitted into our study. The subjects who underwent MJV using Manujet III constituted for Group m, and those who underwent ventilation through lateral aperture of rigid bronchoscopy were Group n, and the narcotic drugs must be identical in Group m and Group n. To analyze the distribution of patients and complications before operation, to analyze the incidence of hypoxemia during and after the operation, to analyze the rate of success of FB removal, to analyze the duration of operation and emergence from anesthesia

From June 2004 to September 2008, there were 1263 patients who were subjected to FB removal. Among them, 67 children (5.30%) accorded to our study qualification, age ranging from 9 months to 131 months (median 25 months), weight ranging 9~33kg (median 13kg), ASA I~III,The duration of FB aspiration was 30days to 370 days (median 87days). 46 children (68.66%) with no FB history, in others 21 (31.34%) cases with positive clinical history( but not chest film findings, or not early symptoms or negative bronchoscopy findings). There was no signification difference between Group m and Group n about the distribution of patients and complications before operation, The incidence of hypoxemia during operation was lower in Group m than in Group n (P<0.05), and the duration of operation and emergence from anesthesia were shorter in Group m than in Group n (P<0.05). There was no significant

and the other perioperative side effects.

Fig. 3. Complaints before operation

Fig. 4. Radiological findings before operation

difference in other compared factors (P>0.05) (see Table 3,4,5).

**3.1.2.2 Results** 


Table 4. Complaints and radiological findings before operation

Manual Jet Ventilation Using Manujet III for

for removal of foreign body, reduce operation time.

**3.2 Main complications relevant to MJV** 

**3.2.1 Pneumothorax** 

Bronchoscopic Airway Foreign Body Removal in Children 213

the trachea and connected to the Manujet III device, that take up airway as little as possible, and provide more space for hard-placed laryngoscopy. Manual jet ventilation can give adequate ventilation and less carbon dioxide retention. In our this retrospective study, manual jet ventilation using Manujet III significantly reduced the occurrence of hypoxia and shorten the operation time. Why was Manujet III manual jet ventilation more adequate? Probably because the jet tube was in main airway, ventilated through bilateral lung, when rigid bronchoscopy into the side of the bronchial airway, the other side of the pulmonary could be ventilated; the ventilated method through lateral aperture of rigid bronchoscopy, when rigid bronchoscopy into the side of the bronchial airway, the other side of the pulmonary could't be ventilated well, If rigid bronchoscopy into the "disease lung" side, that became "disease lung" ventilation and "healthy lung" no ventilation, so the ventilation is inadequate. Manujet III manual jet ventilation in children with complete muscle relaxation can be fixed, good ventilation and good operating vision, can creating favorable conditions

But Manujet III manual jet ventilation is a positive pressure ventilation, need to pay attention to the outlet of gas and muscle relaxation, the pressure should be appropriate (the baby was 0 ~ 1bar, children 1 ~ 2.5bar, adult 2.5 ~ 3.5bar), the chest wall motion should be closely observed to estimate the efficacy of ventilation. Therefore, we recommend the users were to be well trained before used Manujet III. Furthermore, characteristics of the air flow dynamics of manual jet ventilation using Manujet III was not clear, the potential risks need further study. This retrospective study confirmed that MJV using Manujet III in FB removal can offer sufficient ventilation and shorten operation time and fasten analepsia, and prove the advantages in FB removal surgery in the children with a long retained airway foreign body. Manual jet ventilation using Manujet III has many, it should be recommended, but for the

A Pneumothorax is the most serious complication associated with MJV. Reports of the occurrence of this complication vary in the literature. A retrospective review , which covered 942 laryngeal jet ventilation cases (via suspension laryngoscope) collected for as long as 10 years, revealed that pneumothoraces were reported in 4 patients. It is thought that two factors accounted for the pneumothoraces; these were airway damage and high airway pressures. Leemann, et al reported one case involving a combined pneumothorax and subcutaneous emphysema that was caused by airway mucosal damage after laser surgery. In a discussion of this case presented by Sosis, it was regarded that once the pneumothorax and subcutaneous emphysema were observed in the first surgery, jet ventilation should not have been used in the second surgery, because the highly pressurized air flow could pass through the injured mucosal into the pleural and subcutaneous tissues and resulted in the pneumothorax and subcutaneous emphysema. Airway pressure has always been one of the most conspicuous causes of mucosal injury seen in clinical practice. But according to the opinion provided by Bourgain, et al., the occurrence of complications such as pneumothoraces could not be reduced even when pressure-controlled jet ventilation device was used. It is also regarded that the degree of airway pressure after initiation of jet

possible adverse events, the operator should be well trained in advance.


●、◆,■(P<0.05)

Table 5. Comparison between Group m and Group n

#### **3.1.2.3 Discussion**

Airway foreign bodies often occur in 8 months to 3 years old children. However, in many children, there was no clear history of FB or lacked of self-reported or parent-witnessed events. As a result, diagnosis of FBA was often delayed. In addition, medical imaging sensitivity and specificity in the diagnosis of airway FB was low. If lack of obvious early respired symptoms, often led to prolonged FB retention. Although fiberoptic bronchoscopy approach is a highly successful diagnosis approach, in our country, many doctors lack of AFB consciousness, and they seldom give a suggestion of taking fiberoptic bronchoscopy. In our study, organic FBs accounted for 85.07%. The most important feature of organic FBs (such as plant seeds) was that they contain unsaturated fatty acids, which may release arachidonic acid and plant protein. These molecules trigger a inflammatory response that involves the release of inflammatory chemokines, and other substances, causing inflammation of tracheal mucosa, resulting in mucosal swelling and congestion, bronchitis, pneumonia, wheezing, airway obstruction, etc. In addition, the plant seeds are rich with in protein and sugar, with affinity to water, thus the longer the retention time, the softer and more swollen the mucous membrane, exacerbating bronchial obstruction. Consequently, pulmonary secretions can not be discharged in time, increasing the risk of lung infections and "asthma syndrome". Lan F.T found that lung extracellular matrix remodeling, and triggered a series of lung pathological changes in the long FB retained children.

FB removal in the children with complicated lung pathological changes is a high risk procedure. The risks were ventilate disorder and hypoxemia with the most severe lifethreatening, and the most commonest risk being a high incidence of intraoperative hypoxia. So the appropriate ventilation mode was important. We had tried a variety ways of anesthesia ventilation, every method had themselves advantages and disadvantages. In the manual jet ventilation method by Manujet III, a small catheter was inserted transnasally into

(cases and percentage) (cases and percentage)

19.1±4.3■

3(7.5%) 3(11.11%) P=0.612 χ=0.258

33(82.5%) 22(81.48%) P=0.915 χ=0.011

7(17.5%) 5(18.52%) P=0.915 χ=0.011

P=0.043 χ=3.426

Compared items Group m Group n

hypoxia during perform 7(17.5%)● 11(40.74%)●P=0.035 χ=4.431 hypoxia postoperation 5(12.5%) 4(14.81%) P=0.785 χ=0.074 Time of perform(minutes) 21.3±3.7◆ 37.2±6.3◆ P=0.031 χ=5.016

extracted FB(cases) 39(97.5%) 27 (100%) P=0.145 χ=2.219

Airway foreign bodies often occur in 8 months to 3 years old children. However, in many children, there was no clear history of FB or lacked of self-reported or parent-witnessed events. As a result, diagnosis of FBA was often delayed. In addition, medical imaging sensitivity and specificity in the diagnosis of airway FB was low. If lack of obvious early respired symptoms, often led to prolonged FB retention. Although fiberoptic bronchoscopy approach is a highly successful diagnosis approach, in our country, many doctors lack of AFB consciousness, and they seldom give a suggestion of taking fiberoptic bronchoscopy. In our study, organic FBs accounted for 85.07%. The most important feature of organic FBs (such as plant seeds) was that they contain unsaturated fatty acids, which may release arachidonic acid and plant protein. These molecules trigger a inflammatory response that involves the release of inflammatory chemokines, and other substances, causing inflammation of tracheal mucosa, resulting in mucosal swelling and congestion, bronchitis, pneumonia, wheezing, airway obstruction, etc. In addition, the plant seeds are rich with in protein and sugar, with affinity to water, thus the longer the retention time, the softer and more swollen the mucous membrane, exacerbating bronchial obstruction. Consequently, pulmonary secretions can not be discharged in time, increasing the risk of lung infections and "asthma syndrome". Lan F.T found that lung extracellular matrix remodeling, and

triggered a series of lung pathological changes in the long FB retained children.

FB removal in the children with complicated lung pathological changes is a high risk procedure. The risks were ventilate disorder and hypoxemia with the most severe lifethreatening, and the most commonest risk being a high incidence of intraoperative hypoxia. So the appropriate ventilation mode was important. We had tried a variety ways of anesthesia ventilation, every method had themselves advantages and disadvantages. In the manual jet ventilation method by Manujet III, a small catheter was inserted transnasally into

patients studied (cases) 40(59.70%) 27(40.30%)

Time of analepsia (minutes) 16.2±4.1■

Table 5. Comparison between Group m and Group n

respiratory tract obstruction postoperation(cases)

respiration symptoms(cases)

recover from chronic

remain respiration symptoms(cases)

(P<0.05)

**3.1.2.3 Discussion** 

●、◆,■

the trachea and connected to the Manujet III device, that take up airway as little as possible, and provide more space for hard-placed laryngoscopy. Manual jet ventilation can give adequate ventilation and less carbon dioxide retention. In our this retrospective study, manual jet ventilation using Manujet III significantly reduced the occurrence of hypoxia and shorten the operation time. Why was Manujet III manual jet ventilation more adequate? Probably because the jet tube was in main airway, ventilated through bilateral lung, when rigid bronchoscopy into the side of the bronchial airway, the other side of the pulmonary could be ventilated; the ventilated method through lateral aperture of rigid bronchoscopy, when rigid bronchoscopy into the side of the bronchial airway, the other side of the pulmonary could't be ventilated well, If rigid bronchoscopy into the "disease lung" side, that became "disease lung" ventilation and "healthy lung" no ventilation, so the ventilation is inadequate. Manujet III manual jet ventilation in children with complete muscle relaxation can be fixed, good ventilation and good operating vision, can creating favorable conditions for removal of foreign body, reduce operation time.

But Manujet III manual jet ventilation is a positive pressure ventilation, need to pay attention to the outlet of gas and muscle relaxation, the pressure should be appropriate (the baby was 0 ~ 1bar, children 1 ~ 2.5bar, adult 2.5 ~ 3.5bar), the chest wall motion should be closely observed to estimate the efficacy of ventilation. Therefore, we recommend the users were to be well trained before used Manujet III. Furthermore, characteristics of the air flow dynamics of manual jet ventilation using Manujet III was not clear, the potential risks need further study.

This retrospective study confirmed that MJV using Manujet III in FB removal can offer sufficient ventilation and shorten operation time and fasten analepsia, and prove the advantages in FB removal surgery in the children with a long retained airway foreign body.

Manual jet ventilation using Manujet III has many, it should be recommended, but for the possible adverse events, the operator should be well trained in advance.

#### **3.2 Main complications relevant to MJV**

#### **3.2.1 Pneumothorax**

A Pneumothorax is the most serious complication associated with MJV. Reports of the occurrence of this complication vary in the literature. A retrospective review , which covered 942 laryngeal jet ventilation cases (via suspension laryngoscope) collected for as long as 10 years, revealed that pneumothoraces were reported in 4 patients. It is thought that two factors accounted for the pneumothoraces; these were airway damage and high airway pressures. Leemann, et al reported one case involving a combined pneumothorax and subcutaneous emphysema that was caused by airway mucosal damage after laser surgery. In a discussion of this case presented by Sosis, it was regarded that once the pneumothorax and subcutaneous emphysema were observed in the first surgery, jet ventilation should not have been used in the second surgery, because the highly pressurized air flow could pass through the injured mucosal into the pleural and subcutaneous tissues and resulted in the pneumothorax and subcutaneous emphysema. Airway pressure has always been one of the most conspicuous causes of mucosal injury seen in clinical practice. But according to the opinion provided by Bourgain, et al., the occurrence of complications such as pneumothoraces could not be reduced even when pressure-controlled jet ventilation device was used. It is also regarded that the degree of airway pressure after initiation of jet

Manual Jet Ventilation Using Manujet III for

Bronchoscopic Airway Foreign Body Removal in Children 215

However, if tidal volume is to be increased by raising the driving pressure, the barotrauma risk will be increased as a result of high airway pressure. With the increase in frequency, there is a corresponding decrease in tidal volume; the contraflow effect of intrapulmonary gas also becomes weak, and the eliminating rate of carbon dioxide decreases proportionally. The ideal ratio of inspiration to whole respiration period is 20–30%. According to our clinical experience, when performing Manu-jet, the driving pressure should be set less than 15 psi in infants, and between 15–35 psi in children (usually less than 25 psi), and 35–59 psi in adults with a

frequency of 15-30 times/minute in children and 12–20 times/minute in adults.

whistle is heard until adequate anesthesia and muscle relaxation are attained.

**4.3 Attending chest visualization and auscultation** 

**5. Conclusions** 

use Manujet better.

**6. Acknowledgment** 

are YaoZhen, YeMing, et al.

**7. References** 

**4.2 Maintaining adequate depth of anesthesia and degree of muscle relaxation** 

When the depth of anesthesia is not adequate or the degree of muscle relaxation is not enough, the glottis vera will close due to the contraction of laryngeal muscles and gas expiration will be inhibited; this creates turbulent air flow which is indicated by a sound of whistle. Therefore, to avoid barotraumas, MJV has to be stopped immediately when a

During ventilation, it is very necessary to closely observe the chest excursions and listen to the sound of gas flow passing in and out of airway. By doing this, airway obstruction can be found immediately if it occurs. The surgical manipulation in the airway may dislodge the jet catheter,

Manual jet ventilation using Manujet III is a safe and effective technique for airway FB removal by rigid bronchoscopy in children. It offers more favorable outcomes compared with spontaneous respiration. But attention should be paid to closely observe the chest excursion of the patients for the assessment of the efficiency of jet ventilation and to check the location of the catheter to avoid barotrauma caused by bronchotracheal occlusion.

However, the time of MJV with Manujet III wasn't long, its mechanism of airflow dynamics isn't clear enough. the advanced research will focus on the mechanism which can make us

The authors acknowledge Dr. Wu, an anesthesiologist in Cincinnati Children's Medical Center, USA. for the helps in English language; Dr. TianYu Zhang, a rhinolaryngologist in Eye and ENT hospital, China, for the co-operation in foreign body removal; Dr. Dan Chen, an anesthesiologist in Eye and ENT hospital, China, for recording clinical documents; others

Baer GA. (2000). No need for claims: facts rule performance of jet ventilation. *Anesth Analg,*Vol.91,No.4, (October 2000), pp.1040-1041, ISSN 0003-2999

so it is important to frequently check the location of the catheter by lung auscultation.

ventilation depends on not only the rate of aspirating gas stream and diameter of the catheter but also the size of the environment arround the aspirating gas stream, such as, diameter of the airway, cross sectional area of the trachea and the distance from distal end of the catheter to glottis vera. When driving pressure is fixed, the obstruction of airway outflow is the main reason for increased airway pressure and occurrence of pneumothoraces. In upper airway surgeries, possible reasons for airway outflow obstruction include, but are not limited to, severe laryngotracheal stenosis, upper airway blocked by a neoplasm, aggravated airway mucosal edema caused by the operation procedures, and a totally blocked airway possibly due to the surgical procudure or position of surgical devices. Baer pointed out that the monitoring of airway pressure curve has prevented the occurrence of pressure relevant damages, such as pneumothoraces, from happening since this practice was in use for nearly 20 years. Rezaie-Majd also speculated that the most important measure in preventing pressure related damages was to ensure there was no outflow obstruction. The advantage in using the Manujet is that the ventilation device has a pressure-controlling design that can keep gas pressure within the prescribed safety ranges. The ventilation frequency can be adjusted manually by operators. Therefore, this ventilation technique, adopted during surgery, facilitates the cooperation between anesthesiologists and surgeons, and ensures good oxygen supply as well as an unobstructed airway outflow to patients throughout operations. In our hospital, more than 2000 airway foreign body removals were finished under the ventilation model of MJV since 2007, 7 cases of pneumothorax occurred. There was no evidence that could indicate MJV was associated with higher rate of pneumatothoraces than any other ventilation models. So, we consider that MJV can play a safe part in the airway foreign body removal when correctly used.

#### **3.2.2 Hypoxemia**

Although most of the literatures indicate that jet ventilation can provide adequate oxygen supply, hypoxemia is still the most commonly observed complication. Most of the upper airway surgeries were taken in an open airway under suspension laryngoscope or rigid bronchoscope, and jet-propelled entrainment of atmosphere into the airway causes an atmospheric inhaled gas that occupies 25–60% of the tidal volume, attributing to a fraction of inspired oxygen of 32–42% .

#### **3.2.3 Carbon dioxide retention**

Carbon dioxide retention is another complication associated with jet ventilation, especially when the operation is prolonged. This complication is more commonly observed during HFJV and may be attributed to low tidal volume and inhalation of the expiratory gas. In low frequency MJV, the incidence of carbon dioxide retention is low, the elimination of carbon dioxide was mainly influenced by the compliance of thorax.

#### **4. Experiences for the application of MJV using Manujet III device for FB removal**

#### **4.1 Driving pressure level, frequency and inspiration/expiration ratio**

In jet ventilation, gas flow volume is proportional to driving pressure. Therefore, with an increase in driving pressure, tidal volume will increase linearly and PaCO2 will decrease. However, if tidal volume is to be increased by raising the driving pressure, the barotrauma risk will be increased as a result of high airway pressure. With the increase in frequency, there is a corresponding decrease in tidal volume; the contraflow effect of intrapulmonary gas also becomes weak, and the eliminating rate of carbon dioxide decreases proportionally. The ideal ratio of inspiration to whole respiration period is 20–30%. According to our clinical experience, when performing Manu-jet, the driving pressure should be set less than 15 psi in infants, and between 15–35 psi in children (usually less than 25 psi), and 35–59 psi in adults with a frequency of 15-30 times/minute in children and 12–20 times/minute in adults.

#### **4.2 Maintaining adequate depth of anesthesia and degree of muscle relaxation**

When the depth of anesthesia is not adequate or the degree of muscle relaxation is not enough, the glottis vera will close due to the contraction of laryngeal muscles and gas expiration will be inhibited; this creates turbulent air flow which is indicated by a sound of whistle. Therefore, to avoid barotraumas, MJV has to be stopped immediately when a whistle is heard until adequate anesthesia and muscle relaxation are attained.

#### **4.3 Attending chest visualization and auscultation**

During ventilation, it is very necessary to closely observe the chest excursions and listen to the sound of gas flow passing in and out of airway. By doing this, airway obstruction can be found immediately if it occurs. The surgical manipulation in the airway may dislodge the jet catheter, so it is important to frequently check the location of the catheter by lung auscultation.

#### **5. Conclusions**

214 Global Perspectives on Bronchoscopy

ventilation depends on not only the rate of aspirating gas stream and diameter of the catheter but also the size of the environment arround the aspirating gas stream, such as, diameter of the airway, cross sectional area of the trachea and the distance from distal end of the catheter to glottis vera. When driving pressure is fixed, the obstruction of airway outflow is the main reason for increased airway pressure and occurrence of pneumothoraces. In upper airway surgeries, possible reasons for airway outflow obstruction include, but are not limited to, severe laryngotracheal stenosis, upper airway blocked by a neoplasm, aggravated airway mucosal edema caused by the operation procedures, and a totally blocked airway possibly due to the surgical procudure or position of surgical devices. Baer pointed out that the monitoring of airway pressure curve has prevented the occurrence of pressure relevant damages, such as pneumothoraces, from happening since this practice was in use for nearly 20 years. Rezaie-Majd also speculated that the most important measure in preventing pressure related damages was to ensure there was no outflow obstruction. The advantage in using the Manujet is that the ventilation device has a pressure-controlling design that can keep gas pressure within the prescribed safety ranges. The ventilation frequency can be adjusted manually by operators. Therefore, this ventilation technique, adopted during surgery, facilitates the cooperation between anesthesiologists and surgeons, and ensures good oxygen supply as well as an unobstructed airway outflow to patients throughout operations. In our hospital, more than 2000 airway foreign body removals were finished under the ventilation model of MJV since 2007, 7 cases of pneumothorax occurred. There was no evidence that could indicate MJV was associated with higher rate of pneumatothoraces than any other ventilation models. So, we consider that MJV can play a

Although most of the literatures indicate that jet ventilation can provide adequate oxygen supply, hypoxemia is still the most commonly observed complication. Most of the upper airway surgeries were taken in an open airway under suspension laryngoscope or rigid bronchoscope, and jet-propelled entrainment of atmosphere into the airway causes an atmospheric inhaled gas that occupies 25–60% of the tidal volume, attributing to a fraction

Carbon dioxide retention is another complication associated with jet ventilation, especially when the operation is prolonged. This complication is more commonly observed during HFJV and may be attributed to low tidal volume and inhalation of the expiratory gas. In low frequency MJV, the incidence of carbon dioxide retention is low, the elimination of carbon

**4. Experiences for the application of MJV using Manujet III device for FB** 

In jet ventilation, gas flow volume is proportional to driving pressure. Therefore, with an increase in driving pressure, tidal volume will increase linearly and PaCO2 will decrease.

**4.1 Driving pressure level, frequency and inspiration/expiration ratio** 

safe part in the airway foreign body removal when correctly used.

dioxide was mainly influenced by the compliance of thorax.

**3.2.2 Hypoxemia** 

**removal** 

of inspired oxygen of 32–42% .

**3.2.3 Carbon dioxide retention** 

Manual jet ventilation using Manujet III is a safe and effective technique for airway FB removal by rigid bronchoscopy in children. It offers more favorable outcomes compared with spontaneous respiration. But attention should be paid to closely observe the chest excursion of the patients for the assessment of the efficiency of jet ventilation and to check the location of the catheter to avoid barotrauma caused by bronchotracheal occlusion.

However, the time of MJV with Manujet III wasn't long, its mechanism of airflow dynamics isn't clear enough. the advanced research will focus on the mechanism which can make us use Manujet better.

#### **6. Acknowledgment**

The authors acknowledge Dr. Wu, an anesthesiologist in Cincinnati Children's Medical Center, USA. for the helps in English language; Dr. TianYu Zhang, a rhinolaryngologist in Eye and ENT hospital, China, for the co-operation in foreign body removal; Dr. Dan Chen, an anesthesiologist in Eye and ENT hospital, China, for recording clinical documents; others are YaoZhen, YeMing, et al.

#### **7. References**

Baer GA. (2000). No need for claims: facts rule performance of jet ventilation. *Anesth Analg,*Vol.91,No.4, (October 2000), pp.1040-1041, ISSN 0003-2999

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**12** 

*China* 

**Utility of Pediatric Flexible** 

Yong Yin, Shuhua Yuan, Wenwei Zhong and Yu Ding *Department of Respiratory, Shanghai Children's Medical Center* 

*Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai* 

**Bronchoscopy in the Diagnosis and Treatment** 

**of Congenital Airway Malformations in Children** 

Bronchoscopy is an indispensable tool in the clinical evaluation and management of pediatric airway and lung disease. Common indications for pediatric bronchoscopy are varied and extend over a spectrum of congenital, infectious, structural conditions and diagnostic applications . Indications for flexible bronchoscopy in children include the evaluation of stridor, persistent or recurrent wheezing, chronic cough, hemoptysis, atelectasis, suspected airway foreign body, suspected airway anomaly, tracheoesophageal fistula, vascular ring and pneumonia/lower respiratory tract infection. Of note, congenital airway malformations are of specific clinical concern in children with the potential to present as an acute emergency. Airway malformations can cause recurrent wheezing, respiratory distress with, repeated pneumonia by poor drainage of lung segments or aspiration, and life-threatening airway obstruction. Flexible bronchoscopy plays an important role in the diagnosis, evaluation and

The major advantages of flexible bronchoscopy as compared to rigid bronchoscopy, include smaller external diameter of the new pediatric flexible scopes, the ability to change direction (flex and extend within the airway), fine illumination with fibreroptic technology and airway dynamics evaluation. Bronchoscopy is a minimally invasive and superior technique for directly visualizing and evaluating airway anatomy and mucosa compared with chest radiography, high resolution CT scan and bronchogram. Advances in technology leads to more and more sophisticated interventions and therapeutic options in the field of adult bronchoscopy including airway stenting, balloon dilatation, cryotherapy and endobronchial laser therapy. As the development of experience and expertise in the field of pediatric flexible bronchoscopy in clinic, we hope that the versatility of the flexible bronchoscopy can

extend the range of diagnostic and therapeutic interventions in children.

**2. Choice of pediatric flexible bronchoscope for neonates and children** 

The pediatric bronchoscopist should be experienced with expertise in maneuvering the bronchoscope deftly and safely in the pediatric airway. The bronchoscopist should also have a thorough understanding of bronchoscope structure, functions, and reprocessing protocols

**1. Introduction** 

management of such congenital lung malformations.


## **Utility of Pediatric Flexible Bronchoscopy in the Diagnosis and Treatment of Congenital Airway Malformations in Children**

Yong Yin, Shuhua Yuan, Wenwei Zhong and Yu Ding *Department of Respiratory, Shanghai Children's Medical Center Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai China* 

#### **1. Introduction**

218 Global Perspectives on Bronchoscopy

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Sosis M.(2004). Should CO2 laser jet ventilation be abandoned? *Anesth Analg,*Vol.

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Su-Mi S.; Woo S. & Jung E. et,al.(2008). CT in Children With Suspected Residual Foreign

The Difficult Airway Society. Failed ventilation guidelines. 18.12.2010, Available from

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Vourc'h G.; Fischler M. & Michon F.;et al.(1983). Manual jet ventilation v. high frequency jet

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experience of 132 cases. *Singapore Med. J*., Vol.48, No.9, (September 2007),pp. 850-

Bronchoscopy is an indispensable tool in the clinical evaluation and management of pediatric airway and lung disease. Common indications for pediatric bronchoscopy are varied and extend over a spectrum of congenital, infectious, structural conditions and diagnostic applications . Indications for flexible bronchoscopy in children include the evaluation of stridor, persistent or recurrent wheezing, chronic cough, hemoptysis, atelectasis, suspected airway foreign body, suspected airway anomaly, tracheoesophageal fistula, vascular ring and pneumonia/lower respiratory tract infection. Of note, congenital airway malformations are of specific clinical concern in children with the potential to present as an acute emergency. Airway malformations can cause recurrent wheezing, respiratory distress with, repeated pneumonia by poor drainage of lung segments or aspiration, and life-threatening airway obstruction. Flexible bronchoscopy plays an important role in the diagnosis, evaluation and management of such congenital lung malformations.

The major advantages of flexible bronchoscopy as compared to rigid bronchoscopy, include smaller external diameter of the new pediatric flexible scopes, the ability to change direction (flex and extend within the airway), fine illumination with fibreroptic technology and airway dynamics evaluation. Bronchoscopy is a minimally invasive and superior technique for directly visualizing and evaluating airway anatomy and mucosa compared with chest radiography, high resolution CT scan and bronchogram. Advances in technology leads to more and more sophisticated interventions and therapeutic options in the field of adult bronchoscopy including airway stenting, balloon dilatation, cryotherapy and endobronchial laser therapy. As the development of experience and expertise in the field of pediatric flexible bronchoscopy in clinic, we hope that the versatility of the flexible bronchoscopy can extend the range of diagnostic and therapeutic interventions in children.

#### **2. Choice of pediatric flexible bronchoscope for neonates and children**

The pediatric bronchoscopist should be experienced with expertise in maneuvering the bronchoscope deftly and safely in the pediatric airway. The bronchoscopist should also have a thorough understanding of bronchoscope structure, functions, and reprocessing protocols

Utility of Pediatric Flexible Bronchoscopy in the

completion of the procedure.

tract secretions.

Diagnosis and Treatment of Congenital Airway Malformations in Children 221

anesthetic assessment should include a comprehensive evaluation of baseline respiratory status and underlying medical conditions. Flexible bronchoscopy can be performed using either conscious sedation or general anesthesia .Various protocols for anesthesia may be used during flexible bronchoscopy in pediatric patients entailing administration of either intravenous drug combination (e.g. midazolam, meperidine, propofol, ketamine, remifentanyl), or inhalational agents (premixed nitrous oxide, sevoflurane). Regardless of the choice of sedation, and it is essential to ensure adequate delivery of oxygen (either by nasal prongs, face mask, laryngeal mask airway or endotracheal intubation). Ideally, allowing the patient to maintain spontaneous ventilation will provide valuable information on airway dynamics which is an advantage as compared to deep anesthesia and paralysis with controlled ventilation as used during rigid bronchoscopy. The most frequent complication of sedation during flexible bronchoscopy is hypoxaemia, either alone or in association with larygospasm and/or bronchospasm. Hypoxemia should be monitored for continuously before, during and after the procedure; and can be secondary to partial or total airway obstruction by the bronchoscope and/or central respiratory depression due to sedation. Pre-operative identification of high-risk patients, administration of appropriate anesthesia individually tailored for each patient and close monitoring are essential for minimizing potential complications and successful

**4. Applications in the diagnosis of congenital airway malformations** 

Laryngomalacia Tracheal Cartilaginous Sleeve Vocal Cord Paralysis Complete Tracheal Rings Posterior Laryngeal Cleft Tracheal Diverticulum Laryngeal web Tracheal Bronchus

Subglottic Hemangioma Tracheoesophogeal Fistula Subglottic Cyst Bronchial Atresia/Agenesis

Table 2. Common airway anomalies that can be visualized during bronchoscope

Tracheal Stenosis Bronchial Stenosis

Subglottic Stenosis Tracheomalacia and Bronchomalacia

Tracheal Web External Compression by a Vascular Ring

Flexible bronchoscopy enables internal visualization of a child's airways starting from the external nares, via the pharynx, larynx, trachea and large central airways down to the bronchi limited only by the relative size of the child's airways and the external diameter of the bronchoscope. Flexible bronchoscopy in a lightly sedated child who is breathing spontaneously, allows assessment of airway dynamics (not provided by rigid bronchoscopy which requires deep sedation and paralysis) which is critical in diagnosing certain airway abnormalities (Table 2). A detailed inspection of dynamics and movements of the glottis, vocal cords and the trachea is invaluable in the systematically evaluating pediatric airway conditions, such as airway collapse caused by tracheomalacia or external compression. Furthermore, bronchoscopy allows direct examination of the internal surface of the airways, their diameter, and characteristics of the tracheal and bronchial mucosa, and respiratory

and adherence to strict infection control precaution both during the procedure, reprocessing and storage of the equipment. This is essential as fiberoptic bronchoscopes are fragile instruments that need careful handling at each step. The pediatric bronchoscopist should also work closely with the anesthesiologist in deciding and developing an appropriate sedation protocol according to the age, underlying medical condition and respiratory status of each child.

Airway size can be largely determined by the age of the patient and the appropriate sized bronchoscope chosen accordingly. Table 1 depicts the different sizes of bronchoscope that can be selected according to the age of the patient.

Particularly in neonates, infants and young children, the smallest sized bronchoscope available should be used, in order to reduce obstruction of the airway lumen by the bronchoscope during the procedure (which would impair ventilation) and to minimize local mucosal trauma.

The flexible bronchoscope with a 3.6 mm external diameter is useful for infants and young children; the bronchoscope with a 4.8mm external diameter can be used in older children. Both bronchoscopes posses a working/suction channel of 1.2 mm diameter sufficient for suctioning and obtaining a diagnostic bronchoalveolar lavage. The smaller bronchoscope with a 2.8 mm external channel is useful to evaluate neonates and small infants in whom congenital airway malformations and abnormal airway anatomy is suspected. The neonatal bronchoscope with 2.2mm external diameter without a suction channel, and can be used for visualization of the airway in neonates, particularly low birth weight infants, and those intubated with endotracheal tubes of 3.0 diameter or less. The quality of images obtained and visualization increases with the increase in diameter (and hence the number of fiberoptic cables) of the flexible bronchoscope.


Table 1. Types flexible bronchoscopes in children and characteristic features.

#### **3. Sedation and anesthesia for bronchoscopy in children**

Appropriate sedation is important for a well-tolerated bronchoscopic procedure particularly for pediatric patients. Pre-procedure assessment of the child is essential in order to evaluate safety and tolerability of bronchoscopy in addition to anticipating potential difficulties and procedure and anesthesia related complications. Individual pre-

and adherence to strict infection control precaution both during the procedure, reprocessing and storage of the equipment. This is essential as fiberoptic bronchoscopes are fragile instruments that need careful handling at each step. The pediatric bronchoscopist should also work closely with the anesthesiologist in deciding and developing an appropriate sedation protocol according to the age, underlying medical condition and respiratory status

Airway size can be largely determined by the age of the patient and the appropriate sized bronchoscope chosen accordingly. Table 1 depicts the different sizes of bronchoscope that

Particularly in neonates, infants and young children, the smallest sized bronchoscope available should be used, in order to reduce obstruction of the airway lumen by the bronchoscope during the procedure (which would impair ventilation) and to minimize local

The flexible bronchoscope with a 3.6 mm external diameter is useful for infants and young children; the bronchoscope with a 4.8mm external diameter can be used in older children. Both bronchoscopes posses a working/suction channel of 1.2 mm diameter sufficient for suctioning and obtaining a diagnostic bronchoalveolar lavage. The smaller bronchoscope with a 2.8 mm external channel is useful to evaluate neonates and small infants in whom congenital airway malformations and abnormal airway anatomy is suspected. The neonatal bronchoscope with 2.2mm external diameter without a suction channel, and can be used for visualization of the airway in neonates, particularly low birth weight infants, and those intubated with endotracheal tubes of 3.0 diameter or less. The quality of images obtained and visualization increases with the increase in diameter (and hence the number of

Biopsy Brush Picture

Table 1. Types flexible bronchoscopes in children and characteristic features.

**3. Sedation and anesthesia for bronchoscopy in children** 

2.2 >700g No No - Fair Very

3.6 >3kg 1.2 Small + Very

4.0 >10 kg 2.0 Good + Very

Clarity

2.8 >1.5kg 1.2 Small + Good Delicate >4 Useful as has

Appropriate sedation is important for a well-tolerated bronchoscopic procedure particularly for pediatric patients. Pre-procedure assessment of the child is essential in order to evaluate safety and tolerability of bronchoscopy in addition to anticipating potential difficulties and procedure and anesthesia related complications. Individual pre-

Tool durability

good Very good >5.5

Pass through tube No.

good Good >5 In major use

delicate >3 Limited use in very

Extra features

small airway

suction channel

Working channel good for laser and for biopsy

of each child.

mucosal trauma.

O.D. mm

Pt/wt (age)

can be selected according to the age of the patient.

fiberoptic cables) of the flexible bronchoscope.

Suction Channel mm

anesthetic assessment should include a comprehensive evaluation of baseline respiratory status and underlying medical conditions. Flexible bronchoscopy can be performed using either conscious sedation or general anesthesia .Various protocols for anesthesia may be used during flexible bronchoscopy in pediatric patients entailing administration of either intravenous drug combination (e.g. midazolam, meperidine, propofol, ketamine, remifentanyl), or inhalational agents (premixed nitrous oxide, sevoflurane). Regardless of the choice of sedation, and it is essential to ensure adequate delivery of oxygen (either by nasal prongs, face mask, laryngeal mask airway or endotracheal intubation). Ideally, allowing the patient to maintain spontaneous ventilation will provide valuable information on airway dynamics which is an advantage as compared to deep anesthesia and paralysis with controlled ventilation as used during rigid bronchoscopy. The most frequent complication of sedation during flexible bronchoscopy is hypoxaemia, either alone or in association with larygospasm and/or bronchospasm. Hypoxemia should be monitored for continuously before, during and after the procedure; and can be secondary to partial or total airway obstruction by the bronchoscope and/or central respiratory depression due to sedation. Pre-operative identification of high-risk patients, administration of appropriate anesthesia individually tailored for each patient and close monitoring are essential for minimizing potential complications and successful completion of the procedure.

#### **4. Applications in the diagnosis of congenital airway malformations**

Flexible bronchoscopy enables internal visualization of a child's airways starting from the external nares, via the pharynx, larynx, trachea and large central airways down to the bronchi limited only by the relative size of the child's airways and the external diameter of the bronchoscope. Flexible bronchoscopy in a lightly sedated child who is breathing spontaneously, allows assessment of airway dynamics (not provided by rigid bronchoscopy which requires deep sedation and paralysis) which is critical in diagnosing certain airway abnormalities (Table 2). A detailed inspection of dynamics and movements of the glottis, vocal cords and the trachea is invaluable in the systematically evaluating pediatric airway conditions, such as airway collapse caused by tracheomalacia or external compression. Furthermore, bronchoscopy allows direct examination of the internal surface of the airways, their diameter, and characteristics of the tracheal and bronchial mucosa, and respiratory tract secretions.


Table 2. Common airway anomalies that can be visualized during bronchoscope

Utility of Pediatric Flexible Bronchoscopy in the

**4.2 Vocal cord paralysis** 

**4.3 Posterior laryngeal cleft** 

Diagnosis and Treatment of Congenital Airway Malformations in Children 223

In the pediatric population, vocal cord paralysis is the second most common congenital laryngeal anomaly (Fig.2). Central nervous system aetiologies of congenital disorders resulting in bilateral vocal cord paralysis include myelomeningocele, Arnold-Chiari malformation, hypoxic ischemic encephalopathy, cerebral hemorrhage and hydrocephalus. Other causes are traumatic and idiopathic factors which can cause vocal cord paralysis[7,8]. Most frequent causes of unilateral vocal cord paralysis are linked to cardiovascular surgery for correction of heart defects that may cause injury to the recurrent laryngeal nerve and

Bilateral vocal cord paralysis is characterized by a high-pitched inspiratory stridor along with a normal or near normal cry with the vocal cords assuming a midline or paramedian position. Unilateral vocal cord paralysis is characterized by a mild, position-dependent inspiratory stridor with a hoarse, breathy cry and potential risk for feeding difficulties and aspiration [10].

Posterior laryngeal clefts are rare congenital anomalies characterized by a failure of fusion of the posterior cricoid lamina that creates an abnormal communication between the larynx and hypopharynx (Fig.3). The anatomic severity of the cleft can range from the absence of interarytenoid muscle above the superior margin of the cricoid cartilage to the absence of the tracheoesophageal septum. Clinical symptoms include combined feeding-respiratory difficulties, such as coughing, choking and cyanotic attacks during feeding, aspiration, recurrent pneumonia, atelectasis, and even death. Other anomalies like cleft lip and palate

A high index of suspicion is required and bronchoscopy and microlaryngoscopy are needed to make a definitive diagnosis. Posterior laryngeal clefts can be either treated conservatively with medical management to prevent gastroesophageal reflux and aspiration, or surgical repair by endoscopy[11].Early medical management may prevent complications, surgery is needed when conservative measures fail. Depending on the severity of the comorbidities and the respiratory condition, some patients with mild symptoms don't need special

esophageal surgery for esophageal atresia with tracheo-oesophageal fistula[9].

Fig. 2. (a)Left vocal cord paralysis (b) Bilateral vocal cord paralysis

and congenital cardiovascular anomalies may accompany the laryngeal cleft.

treatments, while severe patients may require feeding through a nasogastric tube.

#### **4.1 Laryngomalacia**

Larygomalacia is a usually benign, self-limited disorder; it is the most common congenital laryngeal anomaly (50-75%) and the most common cause of stridor in infants (approx.60%) [1].The term 'laryngomalacia' suggests that the cartilage of the larynx is abnormally soft, but there is no definitive evidence supporting this hypothesis; studies have reported dominance of submucosal edema and lymphatic dilation in the histopathology of tissue excised during supraglottoplasty for the treatment of severe laryngomalacia [2]. Thus, whether laryngomalacia is primarily an anatomical abnormality or whether it is due to delayed neuromuscular development remains under debate. Laryngomalacia is frequently associated with gastro-esophageal reflux, and infants with laryngomalacia may have episodes of micro-aspiration as well [3-5]. The natural history of laryngomalacia is characterized by an onset of inspiratory stridor usually within the first 4-6 weeks of life; the infant's voice and cry are normal. The stridor varies considerably with posture and airflow, is loudest with increased turbulence in airflow such as with crying, agitation and increased respiratory efforts with feeding. The stridor is also louder and appears worse during intercurrent respiratory tract infections. Some patients will have increasing symptoms during the first few months of life but thereafter stridor tends to resolve with time during the latter half of infancy into the second year of life as the supportive tissues mature and the diameter of the airway increases with somatic growth. In some instances, depending on the severity and structural anatomy, stridor may persist beyond the first year of life or even up to several years. Surgical treatment (i.e. supraglottoplasty) may be indicated in severe cases with prolapse of the supraglottic structures into the laryngeal inlet, feeding difficulties with failure to thrive and respiratory distress.

Flexible bronchoscopy demonstrates supraglottic collapse, i.e.prolapse of the epiglottic and/or the aryepiglottic folds and/or arytenodis during inspiration into the glottis (Fig.1).The state of consciousness and respiratory efforts of the patient may be critical in the examination of the dynamics of the larynx and laryngeal structures during spontaneous breathing; some children may be stridulous only when crying, others only when they are asleep. Topical anesthesia can potentially exaggerate the findings associated with laryngomalacia; thus, the larynx should be examined before applying topical anesthesia [6].

Fig. 1. The epiglottis and the aryepiglottic folds prolapse during inspiration into the glottis.

#### **4.2 Vocal cord paralysis**

222 Global Perspectives on Bronchoscopy

Larygomalacia is a usually benign, self-limited disorder; it is the most common congenital laryngeal anomaly (50-75%) and the most common cause of stridor in infants (approx.60%) [1].The term 'laryngomalacia' suggests that the cartilage of the larynx is abnormally soft, but there is no definitive evidence supporting this hypothesis; studies have reported dominance of submucosal edema and lymphatic dilation in the histopathology of tissue excised during supraglottoplasty for the treatment of severe laryngomalacia [2]. Thus, whether laryngomalacia is primarily an anatomical abnormality or whether it is due to delayed neuromuscular development remains under debate. Laryngomalacia is frequently associated with gastro-esophageal reflux, and infants with laryngomalacia may have episodes of micro-aspiration as well [3-5]. The natural history of laryngomalacia is characterized by an onset of inspiratory stridor usually within the first 4-6 weeks of life; the infant's voice and cry are normal. The stridor varies considerably with posture and airflow, is loudest with increased turbulence in airflow such as with crying, agitation and increased respiratory efforts with feeding. The stridor is also louder and appears worse during intercurrent respiratory tract infections. Some patients will have increasing symptoms during the first few months of life but thereafter stridor tends to resolve with time during the latter half of infancy into the second year of life as the supportive tissues mature and the diameter of the airway increases with somatic growth. In some instances, depending on the severity and structural anatomy, stridor may persist beyond the first year of life or even up to several years. Surgical treatment (i.e. supraglottoplasty) may be indicated in severe cases with prolapse of the supraglottic structures into the laryngeal inlet, feeding difficulties with

Flexible bronchoscopy demonstrates supraglottic collapse, i.e.prolapse of the epiglottic and/or the aryepiglottic folds and/or arytenodis during inspiration into the glottis (Fig.1).The state of consciousness and respiratory efforts of the patient may be critical in the examination of the dynamics of the larynx and laryngeal structures during spontaneous breathing; some children may be stridulous only when crying, others only when they are asleep. Topical anesthesia can potentially exaggerate the findings associated with laryngomalacia; thus, the larynx should be examined before applying

Fig. 1. The epiglottis and the aryepiglottic folds prolapse during inspiration into the glottis.

**4.1 Laryngomalacia** 

failure to thrive and respiratory distress.

topical anesthesia [6].

In the pediatric population, vocal cord paralysis is the second most common congenital laryngeal anomaly (Fig.2). Central nervous system aetiologies of congenital disorders resulting in bilateral vocal cord paralysis include myelomeningocele, Arnold-Chiari malformation, hypoxic ischemic encephalopathy, cerebral hemorrhage and hydrocephalus. Other causes are traumatic and idiopathic factors which can cause vocal cord paralysis[7,8]. Most frequent causes of unilateral vocal cord paralysis are linked to cardiovascular surgery for correction of heart defects that may cause injury to the recurrent laryngeal nerve and esophageal surgery for esophageal atresia with tracheo-oesophageal fistula[9].

Bilateral vocal cord paralysis is characterized by a high-pitched inspiratory stridor along with a normal or near normal cry with the vocal cords assuming a midline or paramedian position. Unilateral vocal cord paralysis is characterized by a mild, position-dependent inspiratory stridor with a hoarse, breathy cry and potential risk for feeding difficulties and aspiration [10].

Fig. 2. (a)Left vocal cord paralysis (b) Bilateral vocal cord paralysis

#### **4.3 Posterior laryngeal cleft**

Posterior laryngeal clefts are rare congenital anomalies characterized by a failure of fusion of the posterior cricoid lamina that creates an abnormal communication between the larynx and hypopharynx (Fig.3). The anatomic severity of the cleft can range from the absence of interarytenoid muscle above the superior margin of the cricoid cartilage to the absence of the tracheoesophageal septum. Clinical symptoms include combined feeding-respiratory difficulties, such as coughing, choking and cyanotic attacks during feeding, aspiration, recurrent pneumonia, atelectasis, and even death. Other anomalies like cleft lip and palate and congenital cardiovascular anomalies may accompany the laryngeal cleft.

A high index of suspicion is required and bronchoscopy and microlaryngoscopy are needed to make a definitive diagnosis. Posterior laryngeal clefts can be either treated conservatively with medical management to prevent gastroesophageal reflux and aspiration, or surgical repair by endoscopy[11].Early medical management may prevent complications, surgery is needed when conservative measures fail. Depending on the severity of the comorbidities and the respiratory condition, some patients with mild symptoms don't need special treatments, while severe patients may require feeding through a nasogastric tube.

Utility of Pediatric Flexible Bronchoscopy in the

four grades of luminal obstruction (Fig.5).

detectable lumen.

**4.6 Subglottic hemangioma** 

Diagnosis and Treatment of Congenital Airway Malformations in Children 225

laryngomalacia and vocal cord paralysis. The subglottic airway is the narrowest area of the airway because it is a enclosed by the complete cartilaginous ring of the cricoid, unlike the trachea, which has a posterior membranous section, and the larynx, which has a posterior muscular section. Subglottic stenosis is characterized by recurrent episodes of croup or prolonged croup with a barking cough. Acquired subglottic stenosis is related to a variety of causes, including prolonged endotracheal intubation[17], gastroesophageal reflux, infection, autoimmune disorders, and iatrogenic disorders. The Myer-Cotton grading system for subglottic stenosis (SGS) is widely used in the pediatric community [18]. It classifies SGS into

Fig. 5. The Myer-Cotton grading system for subglottic stenosis. (a)Grade 1: ≤50%

airway obstruction which necessitates medical or surgical intervention [19].

obstruction. (b)Grade 2:51-70% obstruction. (c)Grade 3:71-99% obstruction. (d)Grade 4: no

Congenital subglottic hemangioma is the most common neoplasm of the airway in children (Fig.6). It is a benign tumor associated with hyperplasia of the endothelial cells, mast cells, pericytes, fibroblasts and macrophages. In the absence of treatment, it's potentially lifethreatening during the proliferative phase (occurring below the age of 6-12 months) causing

Fig. 3. Laryngeal cleft extending inferiorly to - but not through - the cricoid cartilage;

#### **4.4 Laryngeal web**

A congenital laryngeal web is a malformation in which abnormal tissue forms between two structures within the larynx. All patients present with some degree of dysphonia, ranging from mild hoarseness to aphonia. Airway obstructive symptoms increase with the extent of the web compromising or occluding the airway, with the most severe cases warranting a tracheotomy to secure the airway[12]. Anterior glottic webs less than 2- to 3-mm thickness are often asymptomatic and do not require treatment. Larger webs can cause symptoms which range from dysphonia and decreased exercise tolerance to severe airway obstruction[13-14].

Laryngoscopy is used to assess precisely the subglottic extension of the web and the size of the residual airway lumen. Webs of the glottis are classified as anterior, posterior, or complete; and may be located at the glottic, supraglottic or infraglottic level. Most commonly found are webs in the anterior portion of the glottis[15].

#### **4.5 Subglottic stenosis**

Subglottic stenosis is narrowing of the subglottic airway, which is housed in the cricoid cartilage. It is the third most common congenital anomaly of the larynx [16] after

Fig. 3. Laryngeal cleft extending inferiorly to - but not through - the cricoid cartilage;

commonly found are webs in the anterior portion of the glottis[15].

A congenital laryngeal web is a malformation in which abnormal tissue forms between two structures within the larynx. All patients present with some degree of dysphonia, ranging from mild hoarseness to aphonia. Airway obstructive symptoms increase with the extent of the web compromising or occluding the airway, with the most severe cases warranting a tracheotomy to secure the airway[12]. Anterior glottic webs less than 2- to 3-mm thickness are often asymptomatic and do not require treatment. Larger webs can cause symptoms which range from dysphonia and decreased exercise tolerance to severe airway obstruction[13-14]. Laryngoscopy is used to assess precisely the subglottic extension of the web and the size of the residual airway lumen. Webs of the glottis are classified as anterior, posterior, or complete; and may be located at the glottic, supraglottic or infraglottic level. Most

Subglottic stenosis is narrowing of the subglottic airway, which is housed in the cricoid cartilage. It is the third most common congenital anomaly of the larynx [16] after

**4.4 Laryngeal web** 

Fig. 4. Anterior Laryngeal web

**4.5 Subglottic stenosis** 

laryngomalacia and vocal cord paralysis. The subglottic airway is the narrowest area of the airway because it is a enclosed by the complete cartilaginous ring of the cricoid, unlike the trachea, which has a posterior membranous section, and the larynx, which has a posterior muscular section. Subglottic stenosis is characterized by recurrent episodes of croup or prolonged croup with a barking cough. Acquired subglottic stenosis is related to a variety of causes, including prolonged endotracheal intubation[17], gastroesophageal reflux, infection, autoimmune disorders, and iatrogenic disorders. The Myer-Cotton grading system for subglottic stenosis (SGS) is widely used in the pediatric community [18]. It classifies SGS into four grades of luminal obstruction (Fig.5).

Fig. 5. The Myer-Cotton grading system for subglottic stenosis. (a)Grade 1: ≤50% obstruction. (b)Grade 2:51-70% obstruction. (c)Grade 3:71-99% obstruction. (d)Grade 4: no detectable lumen.

#### **4.6 Subglottic hemangioma**

Congenital subglottic hemangioma is the most common neoplasm of the airway in children (Fig.6). It is a benign tumor associated with hyperplasia of the endothelial cells, mast cells, pericytes, fibroblasts and macrophages. In the absence of treatment, it's potentially lifethreatening during the proliferative phase (occurring below the age of 6-12 months) causing airway obstruction which necessitates medical or surgical intervention [19].

Utility of Pediatric Flexible Bronchoscopy in the

endoscopic argon laser treatment.

**4.8 Complete tracheal rings** 

potentially life-threatening.

most present with symptoms of acute airway obstruction.

Diagnosis and Treatment of Congenital Airway Malformations in Children 227

web may result as a complication of airway mucosal injury following endotracheal intubation. Although some patients may remain asymptomatic until detected incidentally,

Treatment consists of rupturing the web. The first case was reported by Miller et al.[21] in 1978, as an 8-year-old girl presenting with a six year history of frequent colds, wheezing, and dyspnea in whom the tracheal web was successfully excised after failure of bronchoscopic dilation. In 2004, Alan et al. [22] removed a 9-year-old girl's web by

Congenital complete tracheal rings are a rare anomaly, reported by Scheid et al. in 1938 at the first time. They usually present in the first year of life with respiratory distress[23], and often associated with vascular slings[24], or other malformations such as tracheoesophageal fistula and esophageal atresia. In complete tracheal rings, the normally C-shaped cartilaginous tracheal rings are fused posteriorly replacing the membranous posterior part of the trachea, becoming O shaped(Fig.8). As a consequence, the trachea is often narrower than normal. The complete rings may be localized to the region where the sling passes around the trachea, or may extend to a certain length of the trachea, creating a long-segment tracheal stenosis, causing recurrent wheezing, breathing difficulties, cyanosis, and is

It is very important to observe and examine the contours of tracheal cartilages during the passage of the bronchoscope through the trachea during diagnostic bronchoscopy, which is considered as the gold standard. CT scan may be used to aid the diagnosis and assess the degree of involvement, a single tracheal ring or short or long segment involvement. Definitive treatment is surgical with primary resection of a single ring or short segment with end-to end anastomosis; longer length involvement will require tracheal reconstructive surgery. In cases of associated pulmonary vascular sling anomaly, reimplantation of the anomalous left pulmonary artery is performed. Laser division of complete tracheal rings has

Fig. 8. (a) Coronal projection of the CT scan showing the associated long-segment tracheal stenosis with severe distal deviation and obstruction (Pulmonary artery sling). (b) Complete cartilaginous tracheal rings, the posterior membranous component of the trachea is absent.

Fig. 6. Right-sided subglottic haemangioma

During the first weeks of life, the infant may be asymptomatic. Usually, symptoms of inspiratory stridor followed by biphasic stridor with barking cough and slight hoarseness start at around the age of 2-4 months. Symptoms of respiratory distress with suprasternal and chest retractions, feeding difficulties and failure to thrive depend on the severity of the airway obstruction. If symptoms worsen, then early intervention is indicated.

This may consist of a tracheotomy, general or local treatment with steroids, interferon, propranolol or vincristine therapy, LASER treatment, or open surgery with laryngo-tracheal reconstruction. Spontaneous regression typically occurs after 18-24 months of age [20].

#### **4.7 Tracheal web**

Congenital tracheal web is a rare congenital anomaly. It consists of a thin layer of tissue draped across the tracheal lumen. The web is not complete, and the degree of ventilatory symptoms that may occur is directly related to the size of the remaining functional tracheal lumen. Symptoms consist of stridor, dyspnea and respiratory failure resulting in death in severe cases. Tracheal web may often be misdiagnosed as refractory asthma as symptoms may include recurrent respiratory infections, dyspnea or wheezing. Postintubation tracheal

Fig. 7. Tracheal stenosis caused by a tracheal web

web may result as a complication of airway mucosal injury following endotracheal intubation. Although some patients may remain asymptomatic until detected incidentally, most present with symptoms of acute airway obstruction.

Treatment consists of rupturing the web. The first case was reported by Miller et al.[21] in 1978, as an 8-year-old girl presenting with a six year history of frequent colds, wheezing, and dyspnea in whom the tracheal web was successfully excised after failure of bronchoscopic dilation. In 2004, Alan et al. [22] removed a 9-year-old girl's web by endoscopic argon laser treatment.

#### **4.8 Complete tracheal rings**

226 Global Perspectives on Bronchoscopy

During the first weeks of life, the infant may be asymptomatic. Usually, symptoms of inspiratory stridor followed by biphasic stridor with barking cough and slight hoarseness start at around the age of 2-4 months. Symptoms of respiratory distress with suprasternal and chest retractions, feeding difficulties and failure to thrive depend on the severity of the

This may consist of a tracheotomy, general or local treatment with steroids, interferon, propranolol or vincristine therapy, LASER treatment, or open surgery with laryngo-tracheal

Congenital tracheal web is a rare congenital anomaly. It consists of a thin layer of tissue draped across the tracheal lumen. The web is not complete, and the degree of ventilatory symptoms that may occur is directly related to the size of the remaining functional tracheal lumen. Symptoms consist of stridor, dyspnea and respiratory failure resulting in death in severe cases. Tracheal web may often be misdiagnosed as refractory asthma as symptoms may include recurrent respiratory infections, dyspnea or wheezing. Postintubation tracheal

reconstruction. Spontaneous regression typically occurs after 18-24 months of age [20].

airway obstruction. If symptoms worsen, then early intervention is indicated.

Fig. 6. Right-sided subglottic haemangioma

Fig. 7. Tracheal stenosis caused by a tracheal web

**4.7 Tracheal web** 

Congenital complete tracheal rings are a rare anomaly, reported by Scheid et al. in 1938 at the first time. They usually present in the first year of life with respiratory distress[23], and often associated with vascular slings[24], or other malformations such as tracheoesophageal fistula and esophageal atresia. In complete tracheal rings, the normally C-shaped cartilaginous tracheal rings are fused posteriorly replacing the membranous posterior part of the trachea, becoming O shaped(Fig.8). As a consequence, the trachea is often narrower than normal. The complete rings may be localized to the region where the sling passes around the trachea, or may extend to a certain length of the trachea, creating a long-segment tracheal stenosis, causing recurrent wheezing, breathing difficulties, cyanosis, and is potentially life-threatening.

It is very important to observe and examine the contours of tracheal cartilages during the passage of the bronchoscope through the trachea during diagnostic bronchoscopy, which is considered as the gold standard. CT scan may be used to aid the diagnosis and assess the degree of involvement, a single tracheal ring or short or long segment involvement. Definitive treatment is surgical with primary resection of a single ring or short segment with end-to end anastomosis; longer length involvement will require tracheal reconstructive surgery. In cases of associated pulmonary vascular sling anomaly, reimplantation of the anomalous left pulmonary artery is performed. Laser division of complete tracheal rings has

Fig. 8. (a) Coronal projection of the CT scan showing the associated long-segment tracheal stenosis with severe distal deviation and obstruction (Pulmonary artery sling). (b) Complete cartilaginous tracheal rings, the posterior membranous component of the trachea is absent.

Utility of Pediatric Flexible Bronchoscopy in the

level of the main carina and courses to the right.

**4.11 Tracheomalacia and bronchomalacia** 

syndrome is up to 20.8%[32].

eddied flow and wheezing.

mortality.

Diagnosis and Treatment of Congenital Airway Malformations in Children 229

Fig. 10. A tracheal bronchus originates from the right lateral wall of the trachea above the

obstruct the orifice. In a series of 35 patients with tracheal bronchus, 28 originated from the right wall and 7 from the left wall of the trachea as reported by Ghaye[31]. Other research by Bertrand suggests that the frequency of the tracheal bronchus in children with Down

Tracheobronchomalacia can be divided into two different types: congenital (or primary) and secondary tracheobronchomalacia [33].The cause of congenital tracheobronchomalacia is abnormal cartilaginous ring formation with small, malformed or excessively pliable rings and sometimes absent or defective cartilage affecting the trachea partially or completely. Secondary tracheobronchomalacia may occur due to airway compression by vascular structures, tumor, enlarged lymph nodes, thymus, and even excessive fat. Complicated cardiac abnormalities associated with tracheobronchomalacia may result in a higher

Congenital tracheobronchomalacia is usually caused by abnormal cartilage formation of the trachea and bronchi during the embryonic period. Several changes in cartilage can be found on histopathologic examination, including reduced volume, thinned depth, piecemeal shape of cartilage and even its absence. Acquired tracheobronchomalacia may occur in patients with tracheal cannulation as with prolonged endotracheal intubation, tracheotomy, abnormal left pulmonary artery or vascular ring or sling anomalies, space occupying lesion that compress the airway (for example, goiter), following tracheoesophageal fistula repair , cardiac dilatation and post lung transplantation [34-38]. Secondary tracheobronchomalacia may be related to recurrent bronchitis and infections causing chronic inflammation of airway mucosa. In tracheomalacia, the trachea and bronchi lose their normal horseshoeshape and this leads to the narrowness in airway and limitation of airflow, turbulent or

Bronchoscopy has been considered the gold standard in diagnosis of tracheobronchomalacia with direct visualization of dynamic airway collapse with respiration.(Fig.11,Fig.12). Pulsation may be noted at the site of vascular compression as well. These bronchoscopic

only been described in a small number of cases and may provide an alternative approach in patients who are not able to undergo an open procedure or in an emergency situation [25].

#### **4.9 Tracheal diverticulum**

Tracheal diverticulum was firstly described by Rokintansky in 1938[26]. It is a rarely encountered entity. The frequency of the tracheal diverticulum found in some autopsy series has been estimated to be about 1% [27], and in children older than 10 yr it is reported as 0.3% [28]. The tracheal diverticulum is usually located approximately 4-5 cm below vocal cords or just above the carina. It projects posteriorly where the cartilage rings are deficient and usually lies towards the right where there is no esophagus supporting the paratracheal tissue (Fig.9). Tracheal diverticulum may be congenital or acquired. Congenital diverticulum is not normally detected in infancy unless it is suggested by recurrent episodes of tracheobronchial infection or in association with other congenital malformations[29-30]. The acquired form is thought to be due to prolonged increase in intraluminal pressures as occurs with a chronic cough. Although usually asymptomatic, the tracheal diverticulum may accumulate respiratory secretions that become infected and lead to cough or tracheobronchitis.

#### **4.10 Tracheal bronchus**

A tracheal bronchus originates from the right lateral wall of the trachea above the level of the main carina and courses to the right (Fig. 10). It was firstly described by Sandifort in 1785. The frequency of the tracheal bronchus is approximately from 0.1% to 3%. In most cases, the tracheal bronchus supplies the apical segment of the right upper lobe. In such case, there is usually an additional orifice proximal to the bifurcation of the trachea, and the usually positioned right upper lobe bronchus has only 2 visible segmental branches (instead of three). Less frequently, the tracheal bronchus is associated with other anomalies, such as stenosis of the right main stem bronchus or it may supply additional, dysplastic pulmonary tissue. Patients in whom the tracheal bronchus is undetected, may undergo atelectasis of the right upper lobe when undergoing endotracheal intubation as the endotracheal tube will

only been described in a small number of cases and may provide an alternative approach in patients who are not able to undergo an open procedure or in an emergency situation [25].

Tracheal diverticulum was firstly described by Rokintansky in 1938[26]. It is a rarely encountered entity. The frequency of the tracheal diverticulum found in some autopsy series has been estimated to be about 1% [27], and in children older than 10 yr it is reported as 0.3% [28]. The tracheal diverticulum is usually located approximately 4-5 cm below vocal cords or just above the carina. It projects posteriorly where the cartilage rings are deficient and usually lies towards the right where there is no esophagus supporting the paratracheal tissue (Fig.9). Tracheal diverticulum may be congenital or acquired. Congenital diverticulum is not normally detected in infancy unless it is suggested by recurrent episodes of tracheobronchial infection or in association with other congenital malformations[29-30]. The acquired form is thought to be due to prolonged increase in intraluminal pressures as occurs with a chronic cough. Although usually asymptomatic, the tracheal diverticulum may accumulate respiratory secretions that become infected and lead to cough or

Fig. 9. Tracheal diverticulum in the membranous posterior part of the trachea above the

A tracheal bronchus originates from the right lateral wall of the trachea above the level of the main carina and courses to the right (Fig. 10). It was firstly described by Sandifort in 1785. The frequency of the tracheal bronchus is approximately from 0.1% to 3%. In most cases, the tracheal bronchus supplies the apical segment of the right upper lobe. In such case, there is usually an additional orifice proximal to the bifurcation of the trachea, and the usually positioned right upper lobe bronchus has only 2 visible segmental branches (instead of three). Less frequently, the tracheal bronchus is associated with other anomalies, such as stenosis of the right main stem bronchus or it may supply additional, dysplastic pulmonary tissue. Patients in whom the tracheal bronchus is undetected, may undergo atelectasis of the right upper lobe when undergoing endotracheal intubation as the endotracheal tube will

**4.9 Tracheal diverticulum** 

tracheobronchitis.

carina.

**4.10 Tracheal bronchus** 

Fig. 10. A tracheal bronchus originates from the right lateral wall of the trachea above the level of the main carina and courses to the right.

obstruct the orifice. In a series of 35 patients with tracheal bronchus, 28 originated from the right wall and 7 from the left wall of the trachea as reported by Ghaye[31]. Other research by Bertrand suggests that the frequency of the tracheal bronchus in children with Down syndrome is up to 20.8%[32].

#### **4.11 Tracheomalacia and bronchomalacia**

Tracheobronchomalacia can be divided into two different types: congenital (or primary) and secondary tracheobronchomalacia [33].The cause of congenital tracheobronchomalacia is abnormal cartilaginous ring formation with small, malformed or excessively pliable rings and sometimes absent or defective cartilage affecting the trachea partially or completely. Secondary tracheobronchomalacia may occur due to airway compression by vascular structures, tumor, enlarged lymph nodes, thymus, and even excessive fat. Complicated cardiac abnormalities associated with tracheobronchomalacia may result in a higher mortality.

Congenital tracheobronchomalacia is usually caused by abnormal cartilage formation of the trachea and bronchi during the embryonic period. Several changes in cartilage can be found on histopathologic examination, including reduced volume, thinned depth, piecemeal shape of cartilage and even its absence. Acquired tracheobronchomalacia may occur in patients with tracheal cannulation as with prolonged endotracheal intubation, tracheotomy, abnormal left pulmonary artery or vascular ring or sling anomalies, space occupying lesion that compress the airway (for example, goiter), following tracheoesophageal fistula repair , cardiac dilatation and post lung transplantation [34-38]. Secondary tracheobronchomalacia may be related to recurrent bronchitis and infections causing chronic inflammation of airway mucosa. In tracheomalacia, the trachea and bronchi lose their normal horseshoeshape and this leads to the narrowness in airway and limitation of airflow, turbulent or eddied flow and wheezing.

Bronchoscopy has been considered the gold standard in diagnosis of tracheobronchomalacia with direct visualization of dynamic airway collapse with respiration.(Fig.11,Fig.12). Pulsation may be noted at the site of vascular compression as well. These bronchoscopic

Utility of Pediatric Flexible Bronchoscopy in the

**4.12 Tracheo-esophogeal fistula** 

cardiac abnormalities.

Diagnosis and Treatment of Congenital Airway Malformations in Children 231

Congenital tracheo-esophogeal fistula (TEF) with esophageal atresia occurs with an incidence of approximately 1 in 3500 live births. TEF is potentially lifethreatening in the neonatal period requiring surgical correction. Gibson reported the first case of esophageal atresia with TEF in 1697. Since the report by Laddand and Levin in successful multistage correction of 2 cases of TEF patients in 1939; and technological and clinical advances in neonatal management there has been significant reduction in mortality due to TEF . Surgical correction is well established and survival rates of over 90% can be expected[40]. Survival has been reported to be lower in infants with TEF weighing less than 1500g and with associated

Tracheoesophageal fistula results from failure of the primitive gut to separate and recanalize during early embryonic development resulting in an abnormal fistulous connection between the trachea and esophagus[41]. Five types of TEF with esophageal atresia are described: Type 1:,esophageal atresia, in which both the proximal (upper) and distal (lower) segments of the esophagus end in blind pouches. Neither segment is connected to the trachea; Type 2: Esophageal atresia with tracheoesophageal fistula in which the proximal (upper) segment of the esophagus forms a fistula (TEF) to the trachea. The distal (lower) segment of the esophagus ends in a blind pouch; Type 3: Esophageal atresia with tracheoesophageal fistula, in which the proximal (upper) segment of the esophagus ends in a blind pouch and the distal (lower) segment of the esophagus is attached to the trachea (TEF). Type 4: Esophageal atresia with tracheoesophageal fistula, in which both segments (proximal and distal) of the esophagus are attached to the trachea. Type 5: Tracheoesophageal fistula in which there is no esophageal atresia. An H-type fistula is present between the esophagus and the trachea. The most common type of TEF is type 3, with an incidence around 85%-93%( Fig.14). Type 5 (H type TEF) which is not associated with esophageal atresia potentially display the mildest symptoms, and occur at an incidence of around 4%. Secondary TEF usually results from injury to the esophagus as occurs with swallowing of corrosive agents, erosion by mediastinal granuloma or tumors or accidental perforation during tracheo-esophageal

Fig. 13. Types of tracheo-oesophageal fistula and esophageal atresia malformations: The type III with a blind proximal esophageal pouch and a distal TE fistula is by far the most

common (Reproduced from Holinger [42]. With permission)

findings help differentiate tracheomalacia from tracheostenosis in which there is a fixed and narrowed airway lumen.

Congenital (primary) tracheobronchomalacia is not uncommon, with an incidence of 1/2100 in some estimates[39].Most patients will often outgrow their symptoms at the age of 1-2 years with growth and development. Secondary tracheobronchomalacia occuring in association with cardiac and vascular abnormalities, in which the trachea and bronchi are extrinsically compressed by the enlarged heart chambers or anomalous vascular structures. Most children with tracheobronchomalacia may only need conservative treatment to manage respiratory infections, timely anti-infective agents, physical therapy for clearance of airway secretions and good nutrition for lung and body growth. Continuous positive airway pressure (CPAP) or mechanical ventilator support through a tracheostomy tube may be required in children with severe tracheobronchomalacia.. In some cases, surgical intervention with aortopexy or airway stents may be indicated.

Fig. 11. Two characteristic features of tracheobronchomalacia on bronchoscopy. (a) Dynamic collapse of at least 50% of the airway lumen diameter, during expiration, cough or spontaneous breathing.(b) A ratio of cartilage to membranous wall area of < 3:1

Fig. 12. Dynamic changes of trachea during respiratory period under bronchoscopy. (a) Airway collapse during expiration. (b) Airway dilation during inspiration.

#### **4.12 Tracheo-esophogeal fistula**

230 Global Perspectives on Bronchoscopy

findings help differentiate tracheomalacia from tracheostenosis in which there is a fixed and

Congenital (primary) tracheobronchomalacia is not uncommon, with an incidence of 1/2100 in some estimates[39].Most patients will often outgrow their symptoms at the age of 1-2 years with growth and development. Secondary tracheobronchomalacia occuring in association with cardiac and vascular abnormalities, in which the trachea and bronchi are extrinsically compressed by the enlarged heart chambers or anomalous vascular structures. Most children with tracheobronchomalacia may only need conservative treatment to manage respiratory infections, timely anti-infective agents, physical therapy for clearance of airway secretions and good nutrition for lung and body growth. Continuous positive airway pressure (CPAP) or mechanical ventilator support through a tracheostomy tube may be required in children with severe tracheobronchomalacia.. In some cases, surgical

Fig. 11. Two characteristic features of tracheobronchomalacia on bronchoscopy. (a) Dynamic

collapse of at least 50% of the airway lumen diameter, during expiration, cough or spontaneous breathing.(b) A ratio of cartilage to membranous wall area of < 3:1

Fig. 12. Dynamic changes of trachea during respiratory period under bronchoscopy. (a)

Airway collapse during expiration. (b) Airway dilation during inspiration.

intervention with aortopexy or airway stents may be indicated.

narrowed airway lumen.

Congenital tracheo-esophogeal fistula (TEF) with esophageal atresia occurs with an incidence of approximately 1 in 3500 live births. TEF is potentially lifethreatening in the neonatal period requiring surgical correction. Gibson reported the first case of esophageal atresia with TEF in 1697. Since the report by Laddand and Levin in successful multistage correction of 2 cases of TEF patients in 1939; and technological and clinical advances in neonatal management there has been significant reduction in mortality due to TEF . Surgical correction is well established and survival rates of over 90% can be expected[40]. Survival has been reported to be lower in infants with TEF weighing less than 1500g and with associated cardiac abnormalities.

Tracheoesophageal fistula results from failure of the primitive gut to separate and recanalize during early embryonic development resulting in an abnormal fistulous connection between the trachea and esophagus[41]. Five types of TEF with esophageal atresia are described: Type 1:,esophageal atresia, in which both the proximal (upper) and distal (lower) segments of the esophagus end in blind pouches. Neither segment is connected to the trachea; Type 2: Esophageal atresia with tracheoesophageal fistula in which the proximal (upper) segment of the esophagus forms a fistula (TEF) to the trachea. The distal (lower) segment of the esophagus ends in a blind pouch; Type 3: Esophageal atresia with tracheoesophageal fistula, in which the proximal (upper) segment of the esophagus ends in a blind pouch and the distal (lower) segment of the esophagus is attached to the trachea (TEF). Type 4: Esophageal atresia with tracheoesophageal fistula, in which both segments (proximal and distal) of the esophagus are attached to the trachea. Type 5: Tracheoesophageal fistula in which there is no esophageal atresia. An H-type fistula is present between the esophagus and the trachea. The most common type of TEF is type 3, with an incidence around 85%-93%( Fig.14). Type 5 (H type TEF) which is not associated with esophageal atresia potentially display the mildest symptoms, and occur at an incidence of around 4%. Secondary TEF usually results from injury to the esophagus as occurs with swallowing of corrosive agents, erosion by mediastinal granuloma or tumors or accidental perforation during tracheo-esophageal

Fig. 13. Types of tracheo-oesophageal fistula and esophageal atresia malformations: The type III with a blind proximal esophageal pouch and a distal TE fistula is by far the most common (Reproduced from Holinger [42]. With permission)

Utility of Pediatric Flexible Bronchoscopy in the

the esophagus.

though the esophagus.

Diagnosis and Treatment of Congenital Airway Malformations in Children 233

Floyd classified tracheal agenesis into 3 types of malformation according to the anatomical location [44] (Fig.15). In Type I, accounting for approximately 20% of the malformations, there is atresia of part of the trachea with a normal but short distal trachea, normal bronchi and a tracheo-esophageal fistula (TEF). Sixty percent of the reported cases are of Type II, where there is complete tracheal atresia, the bronchi communicate at the carina (as the TEF) with normal distal bifurcation and bronchi (Fig.15-17). Type III, accounting for 20% of cases, comprises no trachea or carinal development and both mainstem bronchi arise directly from

Fig. 15. Illustration of agenesis of trachea. (Reproduced from Monnier[45]. With permission)

Fig. 16. CT airway reconstruction in coronal view: show left and right main bronchi arising directly from the mid-esophagus. No trachea is present, actually, the endotracheal tube goes

Hiyama et al. described their surgical experience with 2 neonates; one of which had complex cardiac malformations, and died of cardiac failure 1 week after birth. The second with tracheal agenesis with a proximal TEF was managed successfully with multiple surgical

Fig. 14. (a) Chest radiograph shows a gastric tube coiled in blind esophageal pouch (b) Chest radiograph shows round or pocket-like blind esophageal pouch after meglumine diatrizoate injection via gastric tube. (c) Bronchoscopy demonstrates fistulous opening at the posterior aspect of the trachea just 1cm above the carina.

surgery. Complications of primary TEF surgical repair include development of an anastomotic fistula, recurrent laryngeal nerve paralysis, vocal cord paralysis, esophageal stenosis and recurrence of TEF. Recurrent TEF can result from compromise of blood supply and circulation of the area around the original fistula leading to tissue breakdown and fistula recurrence.

#### **4.13 Tracheobronchial absence and agenesis**

Agenesis of the trachea is a rare congenital malformation with an incidence below 1 in 50000. The entire trachea is usually absent and air reaches the bronchi through a fistulous connection with the esophagus; the lungs are normally formed. About half the infants are born premature, and a male predominance has been reported. It was first described by Payne in 1900 when he was dissection an infant died from disease[43].Those patient didn't cry when was born, and with progressive severe dyspnea, cyanosis and even dead. It is usually combination with other severe malformation and can barely survive under current technique.

Fig. 14. (a) Chest radiograph shows a gastric tube coiled in blind esophageal pouch (b) Chest radiograph shows round or pocket-like blind esophageal pouch after meglumine diatrizoate injection via gastric tube. (c) Bronchoscopy demonstrates fistulous opening at the posterior

surgery. Complications of primary TEF surgical repair include development of an anastomotic fistula, recurrent laryngeal nerve paralysis, vocal cord paralysis, esophageal stenosis and recurrence of TEF. Recurrent TEF can result from compromise of blood supply and circulation of the area around the original fistula leading to tissue breakdown and

Agenesis of the trachea is a rare congenital malformation with an incidence below 1 in 50000. The entire trachea is usually absent and air reaches the bronchi through a fistulous connection with the esophagus; the lungs are normally formed. About half the infants are born premature, and a male predominance has been reported. It was first described by Payne in 1900 when he was dissection an infant died from disease[43].Those patient didn't cry when was born, and with progressive severe dyspnea, cyanosis and even dead. It is usually combination with other severe malformation and can barely survive under current

aspect of the trachea just 1cm above the carina.

**4.13 Tracheobronchial absence and agenesis** 

fistula recurrence.

technique.

Floyd classified tracheal agenesis into 3 types of malformation according to the anatomical location [44] (Fig.15). In Type I, accounting for approximately 20% of the malformations, there is atresia of part of the trachea with a normal but short distal trachea, normal bronchi and a tracheo-esophageal fistula (TEF). Sixty percent of the reported cases are of Type II, where there is complete tracheal atresia, the bronchi communicate at the carina (as the TEF) with normal distal bifurcation and bronchi (Fig.15-17). Type III, accounting for 20% of cases, comprises no trachea or carinal development and both mainstem bronchi arise directly from the esophagus.

Fig. 15. Illustration of agenesis of trachea. (Reproduced from Monnier[45]. With permission)

Fig. 16. CT airway reconstruction in coronal view: show left and right main bronchi arising directly from the mid-esophagus. No trachea is present, actually, the endotracheal tube goes though the esophagus.

Hiyama et al. described their surgical experience with 2 neonates; one of which had complex cardiac malformations, and died of cardiac failure 1 week after birth. The second with tracheal agenesis with a proximal TEF was managed successfully with multiple surgical

Utility of Pediatric Flexible Bronchoscopy in the

**5.2 Laser treatment in laryngomalacia** 

precision than a microscissors resection.

in H-type TEF[48] .

Diagnosis and Treatment of Congenital Airway Malformations in Children 235

establish a guide wire loop between the tracheoesophageal fistulae in 6 cases of isolated tracheoesophageal fistula (Fig.18) Their success in locating and separating the TE fistula without recurrence in all cases, was the basis for their suggestion that this method be used

Fig. 18. (a) Shows contrast media passing through abnormal fistulous connection in the midesophagus during injection of meglumine diatrizoate via gastric tube. (b) Shows fistula located at the posterior tracheal wall visualized during bronchoscopy. (c) Shows color staining of the tracheal fistula after injection of methylene blue via gastroscopy. (d) Shows insertion of a guide wire towards the esophagus via bronchoscopy. (e) Shows the guide wire entering the esophagus. (f) Shows the guide wire loop between trachea and esophagus.

With super-pulse or ultra-pulse technology, the CO2 laser is more precise than microscissors in resecting the desired amount of tissue without causing much bleeding. Further, depending on each individual child and clinical situation, the CO2 laser allows for additional vaporisation of tissue to achieve a tailored resection (Fig.19). If appropriate CO2 laser parameters are used, then a char-free resection with less than 50μ (four to five cells) depth of coagulation necrosis is achieved . This technique offers more versatility and

Holinger et al [49] performed supraglottoplasty using CO2 laser which provided 6~9W of power with approximately 0.5mm diameter spot. The CO2 laser can relieve upper airway obstruction caused by laryngomalacia with less bleeding and higher accuracy. McClurg FL [50] summarized indications for supraglottoplasty using CO2 laser in 1994 to include the following: collapse of the glottis during inspiration, arrest of development, obstructive apnea, cor pulmonale, severe reflux and asphyxia in awake patients. Andrew et al reported

Fig. 17. Bronchoscopic findings in tracheal agenesis

procedures, including tracheotomy, with a long T-tube to maintain airway patency beyond the proximal TEF and esophageal reconstruction with a colonic interposition graft.[46]. It is essential to suspect this malformation and diagnose at birth, maintain airway patency with initial palliative surgerical procedures which are lifesaving until reconstructive surgery can be performed for successful outcomes. We hypothesize that tracheal transplantation could be a promising therapy in the future; with advances in tissue engineering, there is potential for the prognosis of this disease to be largely improved.

#### **5. The therapeutic benefit of bronchoscopy in children with congenital airway malformation**

#### **5.1 Assisting identification and localization of the tracheoesophageal fistulae prior to and during surgery**

It is necessarily important but also understandably technically difficult to locate the distal communicating ends of the tracheoesophageal fistula precisely prior to surgical correction of H-type TE fistulae. Precise dissection is required during the surgical procedure to avoid injury of surrounding and adjacent tissue. This is particularly true for patients who require secondary surgical correction; as it is a surgical challenge as there significant post-operative adhesions may have formed. Flexible bronchoscopy assists in locating the fistula precisely using transillumination of the airway by the inserted bronchoscope. This technique can shorten surgical time spent in searching and locating the communicating ends of the TE fistula. Blanco-Rodriguez et al reported their experience with 3 neonates utilizing preoperative catheterization of H-type tracheoesophageal fistula with either a rigid bronchoscope or a nasolaryngoscope. to facilitate identification, plan the surgical approach, and to reduce operating times and the extent of surgery. [47]. Several surgeons recommend locating the TE fistula by insertion of a catheter into the visualized orifice during bronchoscopy, however, with little success because of migration of catheter during operation. Garcia et al used bronchoscopy and oesophagoscopy perfomed simultaneously to

procedures, including tracheotomy, with a long T-tube to maintain airway patency beyond the proximal TEF and esophageal reconstruction with a colonic interposition graft.[46]. It is essential to suspect this malformation and diagnose at birth, maintain airway patency with initial palliative surgerical procedures which are lifesaving until reconstructive surgery can be performed for successful outcomes. We hypothesize that tracheal transplantation could be a promising therapy in the future; with advances in tissue engineering, there is potential

**5. The therapeutic benefit of bronchoscopy in children with congenital airway** 

**5.1 Assisting identification and localization of the tracheoesophageal fistulae prior to** 

It is necessarily important but also understandably technically difficult to locate the distal communicating ends of the tracheoesophageal fistula precisely prior to surgical correction of H-type TE fistulae. Precise dissection is required during the surgical procedure to avoid injury of surrounding and adjacent tissue. This is particularly true for patients who require secondary surgical correction; as it is a surgical challenge as there significant post-operative adhesions may have formed. Flexible bronchoscopy assists in locating the fistula precisely using transillumination of the airway by the inserted bronchoscope. This technique can shorten surgical time spent in searching and locating the communicating ends of the TE fistula. Blanco-Rodriguez et al reported their experience with 3 neonates utilizing preoperative catheterization of H-type tracheoesophageal fistula with either a rigid bronchoscope or a nasolaryngoscope. to facilitate identification, plan the surgical approach, and to reduce operating times and the extent of surgery. [47]. Several surgeons recommend locating the TE fistula by insertion of a catheter into the visualized orifice during bronchoscopy, however, with little success because of migration of catheter during operation. Garcia et al used bronchoscopy and oesophagoscopy perfomed simultaneously to

Fig. 17. Bronchoscopic findings in tracheal agenesis

for the prognosis of this disease to be largely improved.

**malformation** 

**and during surgery** 

establish a guide wire loop between the tracheoesophageal fistulae in 6 cases of isolated tracheoesophageal fistula (Fig.18) Their success in locating and separating the TE fistula without recurrence in all cases, was the basis for their suggestion that this method be used in H-type TEF[48] .

Fig. 18. (a) Shows contrast media passing through abnormal fistulous connection in the midesophagus during injection of meglumine diatrizoate via gastric tube. (b) Shows fistula located at the posterior tracheal wall visualized during bronchoscopy. (c) Shows color staining of the tracheal fistula after injection of methylene blue via gastroscopy. (d) Shows insertion of a guide wire towards the esophagus via bronchoscopy. (e) Shows the guide wire entering the esophagus. (f) Shows the guide wire loop between trachea and esophagus.

#### **5.2 Laser treatment in laryngomalacia**

With super-pulse or ultra-pulse technology, the CO2 laser is more precise than microscissors in resecting the desired amount of tissue without causing much bleeding. Further, depending on each individual child and clinical situation, the CO2 laser allows for additional vaporisation of tissue to achieve a tailored resection (Fig.19). If appropriate CO2 laser parameters are used, then a char-free resection with less than 50μ (four to five cells) depth of coagulation necrosis is achieved . This technique offers more versatility and precision than a microscissors resection.

Holinger et al [49] performed supraglottoplasty using CO2 laser which provided 6~9W of power with approximately 0.5mm diameter spot. The CO2 laser can relieve upper airway obstruction caused by laryngomalacia with less bleeding and higher accuracy. McClurg FL [50] summarized indications for supraglottoplasty using CO2 laser in 1994 to include the following: collapse of the glottis during inspiration, arrest of development, obstructive apnea, cor pulmonale, severe reflux and asphyxia in awake patients. Andrew et al reported

Utility of Pediatric Flexible Bronchoscopy in the

**5.4 Balloon dilation for airway stenosis** 

90% of short-term efficacy and 54% long-term efficacy.

enlarged after balloon dilatation.

Diagnosis and Treatment of Congenital Airway Malformations in Children 237

Fig. 20. (a) Expanding of a metal stent in airway carried by delivery device. (b) Full

under bronchoscopic visualization and guidance are gradually inflated and utilized.

Fig. 21. (a) Narrowed mid part of trachea. (b) Narrowed tracheal segment that has been

The mechanism of balloon dilation of the airway relies on expanding the narrowed airway by creating longitudinal splits in the airway mucosa and tissues when the placed balloon is inflated by a pressure syringe device. The longitudinal splits around narrowed tracheal wall will be eventually filled with healing and fibrous tissue enlarging the narrowed airway (Fig.21). Balloon catheters that impart radially directed forces and can be precisely placed

Cohen [52]reported a case of a 28 month old patient with congenital tracheobronchial stenosis who encountered restenosis after surgical tracheobronchoplasty which manifested as progressive dyspnea. The patient was anesthetized and tracheal and bilateral bronchial balloon dilatation was performed under fluoroscopic visualization. Andre et al[53] described balloon tracheoplasty cases in children over a 15 year period; 37 patients underwent 158 procedures for airway balloon dilation performed under bronchoscopic visualization ; with

reopening of the collapsed airway with the expansion of the placed stent.

Fig. 19. (a) Inward collapse of the aryepiglottic folds. (b) CO2 laser resection of the excessive mucosa with preservation of the pharyngo-epiglottic folds.

on 76 cases of laryngomalacia over a 10 year period; CO2 laser supraglottoplasty resulted in a resolution of symptoms in 80% of the cases.

#### **5.3 Stent insertion for tracheobronchomalacia**

Tracheobronchomalacia, results in airflow limitation due to dynamic airway collapse and can be either a primary developmental abnormality of cartilage, or secondary to external compression (such as abnormal vasculature, cysts or tumor). Theoretically, insertion of an airway stent can maintain airway lumen and diameter, preventing collapse and thereby improving symptoms (Fig.1). Tracheobronchomalacia occurs fairly commonly in patients with congenital cardiovascular abnormalities with an incidence of 20-58%. Mortality may be high in patients with severe tracheobronchomalacia 51]. Bronchomalacia usually occurs in the left mainstem bronchus because of its proximity to the left atrium and left pulmonary artery, abnormal enlargement of which and pulsatility could compress the left main bronchus leading to bronchomalacia.

There are two methods to place airway stents, one surgical and the other non surgical. Fayon[51] treated 14 patients with left bronchomalacia using silicone stents with success in 6 patients (43%) ; one patient died of stent obstruction .With the development of newer types of stents and delivery devices, non surgical insertion and deployment is utilized, most often using special stent delivery device to place the stent precisely at the required location under bronchoscopic visualization.

However, it must be noted that in the pediatric age group, airway stents are infrequently used given the potential complications and limitations including formation of granulation tissue, potential for stent migration and penetration of adjacent structures. Other problems include technically difficult removal of the stent, potential for stent obstruction and death, stent fracture, the need for a larger stent placement or need to dilate the stent as the child grows and the airway diameter increases with growth and development. Currently, stents are used only in limited situations in children and when conventional therapy has failed.

Fig. 20. (a) Expanding of a metal stent in airway carried by delivery device. (b) Full reopening of the collapsed airway with the expansion of the placed stent.

#### **5.4 Balloon dilation for airway stenosis**

236 Global Perspectives on Bronchoscopy

Fig. 19. (a) Inward collapse of the aryepiglottic folds. (b) CO2 laser resection of the excessive

on 76 cases of laryngomalacia over a 10 year period; CO2 laser supraglottoplasty resulted in

Tracheobronchomalacia, results in airflow limitation due to dynamic airway collapse and can be either a primary developmental abnormality of cartilage, or secondary to external compression (such as abnormal vasculature, cysts or tumor). Theoretically, insertion of an airway stent can maintain airway lumen and diameter, preventing collapse and thereby improving symptoms (Fig.1). Tracheobronchomalacia occurs fairly commonly in patients with congenital cardiovascular abnormalities with an incidence of 20-58%. Mortality may be high in patients with severe tracheobronchomalacia 51]. Bronchomalacia usually occurs in the left mainstem bronchus because of its proximity to the left atrium and left pulmonary artery, abnormal enlargement of which and pulsatility could compress the left main

There are two methods to place airway stents, one surgical and the other non surgical. Fayon[51] treated 14 patients with left bronchomalacia using silicone stents with success in 6 patients (43%) ; one patient died of stent obstruction .With the development of newer types of stents and delivery devices, non surgical insertion and deployment is utilized, most often using special stent delivery device to place the stent precisely at the required location under

However, it must be noted that in the pediatric age group, airway stents are infrequently used given the potential complications and limitations including formation of granulation tissue, potential for stent migration and penetration of adjacent structures. Other problems include technically difficult removal of the stent, potential for stent obstruction and death, stent fracture, the need for a larger stent placement or need to dilate the stent as the child grows and the airway diameter increases with growth and development. Currently, stents are used only in limited situations in children and when conventional

mucosa with preservation of the pharyngo-epiglottic folds.

a resolution of symptoms in 80% of the cases.

bronchus leading to bronchomalacia.

bronchoscopic visualization.

therapy has failed.

**5.3 Stent insertion for tracheobronchomalacia** 

The mechanism of balloon dilation of the airway relies on expanding the narrowed airway by creating longitudinal splits in the airway mucosa and tissues when the placed balloon is inflated by a pressure syringe device. The longitudinal splits around narrowed tracheal wall will be eventually filled with healing and fibrous tissue enlarging the narrowed airway (Fig.21). Balloon catheters that impart radially directed forces and can be precisely placed under bronchoscopic visualization and guidance are gradually inflated and utilized.

Cohen [52]reported a case of a 28 month old patient with congenital tracheobronchial stenosis who encountered restenosis after surgical tracheobronchoplasty which manifested as progressive dyspnea. The patient was anesthetized and tracheal and bilateral bronchial balloon dilatation was performed under fluoroscopic visualization. Andre et al[53] described balloon tracheoplasty cases in children over a 15 year period; 37 patients underwent 158 procedures for airway balloon dilation performed under bronchoscopic visualization ; with 90% of short-term efficacy and 54% long-term efficacy.

Fig. 21. (a) Narrowed mid part of trachea. (b) Narrowed tracheal segment that has been enlarged after balloon dilatation.

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#### **6. Future trends**

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#### **7. References**


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