Blood samples were collected before operation, at 20 min after the start of cardiopulmonary bypass (CPB), 1 h after the end of CPB and 24 h after CPB. Levels of plasma NSE and protein S 100b were measured by ELISA.

• 全组均在术前、CPB开始后 2 0min、CPB结束后 1h和 2 4h采取血样本 ,运用酶联免疫吸附法测定血浆中NSE和S 10 0b蛋白含量 ;