Preconditioning ischemia for 3 min could apparently decrease DND caused by ischemia for 6 min after the preconditioning at an interval of 1 d reperfusion.

• 而经过 3min预缺血处理 ；可明显减轻间隔1d后 6min缺血引起的海马DND (P <0 0 1)。