“…However, these patients are prone to pulmonary hypertensive crisis after surgery which may be due to hypoperfusion of pulmonary tissue during cardiopulmonary bypass .The pulmonary compliance will decrease in patients with pulmonary hypertension crisis and prone them to respiratory complications and PMV (4,5).Cardiac dysfunction is another important predictor for PMV after congenital heart disease surgery. (2, 3) Many children with congenital heart anomalies, particularly those with complex ones have limited cardiac reserve which may get worse during CPB (22).The occurrence of heart failure and low output state syndrome after congenital heart surgery is multi factorial and depends on the severity of cardiac dysfunction before surgery, aortic cross clamp time, CPB time and myocardial preservation measures during surgery (1,3). With persistence, the heart failure clinical manifestations, and discontinuing the inotrope support will be difficult and using multiple and high dose inotropes might induce more myocardial damages (1,3,22).…”