Objective:To investigate the protective effects and mechanisms of scutellaria baicalensis stemleaf total flavonoid(SSTF) pretreatment on cerebral ischemia reperfusion rats.Methods:50 SD rats were randomly divided into 5 groups:sham operation group,ischemia reperfusion group and low,middle,high SSTF dosage group(n=10) .The cerebral ischemia reperfusion rats model were made by suture method 1 week after the rats were lavaged with drugs respectively.The MDA content,SOD and LDH activity in serum were detected r...