In order to observe the improvement effects of Zhenxuanyin (ZXY) to the rats vertebral artery infarction, it’s prevention ability to the Pulsinelli’s 4 vessel occlusion (4VO) rats model and it’s influences to the normal rats brain. The infarction of the rats vertebral artery (vertebral 2 VO) and the 4VO rats model were achieved through electrocoagulation. 123 I IMP was used to trace cerebral blood flow (CBF). Except of cerebral cortex, the blood flow of each region decreased. Dosage of ZXY at 0 3 g/kg was able to normalize the decreased blood flows in cerebral regions. Healthy rats were medicated at a daily 0 3 g/kg and 1 g/kg dosage of ZXY. At the end of 1 week, they were made into 4VO model rats. No effective prevention effect was found. ZXY had no obvious effect on the CBF of normal rats. Vertebral 2 vessel occlusion is similar to clinical mild cerebral inefficient blood supply, therefore closer to the model of clinical VID. ZXY is able to normalize this incomplete compensation state, which is consistent with the curative effect on Pulsinelli’s 4VO model rats. The best curative dosage of ZXY does not improve normal rats’ CBF implied that ZXY used to cure regional cerebral ischemia at the acute stage does not dilate the cerebral blood vessel in the normal region, thus does not cause blood stealing in the brain 〔5〕 , Therefore, ZXY is an ideal CBF improving agent.
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