Objective To study changes of plasma cortisol level after pediatric cardiac surgery with cardiopulmonary bypass(CPB)and explore risk factors for adrenal insufficiency(AI)after surgery.

Among them, 3 had aortic stenosis, 3 aortic insufficiency, and 8 aortic stenosis with other cardiac structural anomalies. IOTEE was performed before cardiopulmonary bypass in the operating room.