**Post obstructive negative pressure pulmonary oedema**

This commonly happened in the immediate postoperative time when the patient is trying to breathe while the airway is closed as he is biting on tracheal tube. This will create negative intrathoracic pressures, and this will lead to pulmonary oedema. Using bite blocks can reduce this risk. Deflating the cuff of the tube allowing the patient to breathe around it.

Using CPAP may help; but, if there is significant hypoxia, re-intubation should not be delayed.

Early management with re-intubation and ventilation will help for full recovery [12]. **Laryngospasm**

It usually happened due to stimulation during a light plane of anesthesia but may occur due to blood, secretions or foreign body in the larynx. The management is by clearing the oropharynx, applying CPAP with 100% oxygen, followed by deepening of anesthesia by an i.v. anesthetic agent. Also using short-acting muscle relaxant as Succinylcholine may be needed. But in case of significant laryngospasm, re-intubation will be the proper immediate action [12].
