Nitric oxide (NO),angiotensin - convertion enzyme (ACE), endothelin - 1 (ET - 1), and circulating endothelial cells (CEC) of each patient were measured on the 1 st and 7 th day after admission.

• 分别于入院1 d和7 d抽取静脉血,测定一氧化氮(NO)、血管紧张素转换酶(ACE)、内皮素-1(ET-1)水平及外周血内皮细胞(CEC)数量。