研究单位：[1]Huazhong University of Science and Technology[2]Department of Anesthesiology,Tongji Hospital,Tongiji Medical College Huazhong University of Science and Technology Wuhan,Hubei,China,430030
研究目的：
The investigators hypothesized that dexmedetomidine as an anesthetic adjunct can be used in the setting of off-pump coronary bypass procedure and can provide benefits to cardiac function and cognitive performance on the ground of the dexmedetomidine's characteristics.
