Purpose To investigate the influence of ischemic preconditioning(IP) on permeability of blood brain barrier(BBB)and expression of matrix metalloproteinase-9 (MMP?9)in subsequent ischemic hemisphere.

• 目的 研究缺血预处理 (IP)对再缺血脑组织血脑屏障通透性和MMP 9表达的影响。