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.

目的研究小儿体外循环（CPB）术后血皮质醇的变化规律，探讨可能导致术后肾上腺皮质功能不全（AI）的危险因素。

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Objective: To investigate change and signification of neutrophil elastase (ne) before and after cardiopulmonary bypass (CPB) in pediatric cardiac surgery.

目的：研究小儿心脏手术CPB前后中性粒细胞弹性蛋白酶(NE)的改变及其意义。

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