Plasma nitric oxide products(NOP,in terms of NO 2 -/NO 3 -)contents and endothelin(ET)levels were measured before ischemia,30minutes after ischemia and 30 ,60 and 120 minutes after reperfusion.

• 分别检测缺血前、缺血 3 0min及再灌注 3 0、60、12 0min 5个时相点血浆NO代谢产物 (NOP)的含量、ET水平的变化 ,同时测定再灌注 12 0min脑组织NOP、ET的浓度 ,并行脑组织电镜观察。