Inclusion Criteria:  American Society of anesthesia score (ASA) 2-3 Scheduled for a laparoscopic gastric bypass  Exclusion Criteria:  Patient refusal Medical diseases: Cardiac arrhythmia like atrioventricular block 2nd or 3rd degree, pacemaker, arterial hypotension, severe bradycardia, cerebrovascular pathology, renal and/or hepatic insufficiency Previous bariatric surgery Allergy to any medication used during the surgery