**1. Introduction**

276 Perioperative Considerations in Cardiac Surgery

[64] Sirlak M, Yazicioglu L, Inan MB, Eryilmaz S, Tasoz R, Aral A, Ozyurda U. Oral thyroid

2004;26(4):720-725.

hormone pretreatment in left ventricular dysfunction. *Eur J Cardiothorac Surg.* 

Pulmonary hypertension (PH) is associated with increased morbidity and mortality and is an important prognostic factor in cardiac surgery. As the average age and associated comorbidities of cardiac surgical patients increase, the prevalence of PH is likely to rise. In this chapter, we will define PH, classify it on the basis of pathophysiological etiology, and suggest treatment therapies according to this classification. The importance of PH in cardiac surgery, its relationship to right ventricular dysfunction and preventive therapies will also be discussed. When applicable, we will draw from our clinical experience with PH to suggest strategies for the prevention of possible complications.
