After obtaining informed consent,80 morbidly obese ASA II-III patients undergoing laparoscopic bariatric surgery procedures would be randomly assigned to one of four study groups at UTSWMC at Dallas.Hemodynamic paarameters, recovery times, postoperative pain scores, the need for rescue analgesics and side effects will be recorded.The purpose of this study is to determine the optimal linfusion rate of dexmedetomidine for maintaining cardiovscular stability during general anesthesia.