研究单位：[1]Department of Anesthesiology,Tongji Hospital of Tongji Medical College,Huazhong University of Science and Technology,Wuhan,Hubei 430030,P.R.China
研究目的：
The purpose of this study is to determine whether there is a significant decrease in cerebral oxygen saturation in hypertensive patients undergoing major abdominal surgery and their correlation with standard monitoring parameters.
