Results: (1) The median survival time(MST) of N-Control, C-Control and Dex was 9, 18 and 15 days respectively, and had no difference each other(P>0.05).

• 结果：(1)各组大鼠术后存活时间：N-Control组(n=7)MST=9天、C-Control组(n=8)MST=18天和Dex组(n=8)MST=15天，术后存活时间无明显差别；