RESUMO
Objective To study the protective effects of propofol against ischemia-reperfusion injury in rat brains.Methods Modified Longa modle of focal cerebral ischemia-reperfusion injury was used. 200 healthy male SD rats, weighing 200-300g were anesthetized with intraperitoneal(I.P.) ketamine and propofol. When righting reflx was abolished, external carotid artery was exposed. A nylon thread with rounded end was inserted cranially until anterior cerebral artery was reached. After 3h ischemia nylon thread was withdrawn for reperfusion which lasted 3h. Bloos samples were obtained from orbit. Skull was opened and brain removed. In control group carotid artery was exposed but nylon thread was not inserted cranially. The animals were divided into four groups: (1)ischemia-reperfusion model group: normal saline 10 ml was administered I.P.,(2)operation control group: normal saline was given I.P.at the end of operation,(3)nimodipine group: nimodipine 1 mg?kg -1 was administered I.P. 10 min before ischemia,(4) propofol group: propofol 110 mg?kg -1 was given I.P. 10 min before ischemia. Brain infarction area, cerebral water content, serum lactate dehydrogenase(LDH) and creatine kinase(CK) levels,brain SOD activity and MDA and Ca 2+ levels were measured. Ultrastracture of brain tissue was examined by electron microscopy.Results Propofol 110 mg?kg -1 reduced mortality after brain ischemia/reperfusion injury. Infarction area of brain was significantly smaller in propofol and nimodipine groups than that in group 1. Propofol significantly inhibited the increases in serum LDH and CK levels induced by ischemia/reperfusion, increased SOD activity and decreased MDA content and Ca 2+ level in brain tissue. There was less brain tissue damage in propofol group.Conclusions Propofol 110 mg?kg -1 has protective effect against cerebral ischemia-reperfusion injury in rats.