Objective: To detect plasma C-type Natriuretic Peptide(CNP) and Endothelin-l(ET-l) levels during Cardiopulmonary Bypass(CPB) and analyze reasons of dynamic changes.

• 目的:动态观察血浆C型利钠肽(CNP)与内皮素-1(ET-1)水平在体外循环(CPB)围术期的变化,并分析其变化的原因。