This study is about the effect of dexmedetomidine to the stress of pituitrin in laparoscopic hysteromyoma surgery. It is well known that pituitrin has been widespread used in the laparoscopic hysteromyoma surgery. Pituitrin includes oxytocin and vasopressin. Vasopressin increase body stress reaction through hypothalamic pituitary adrenal(HPA) axis. The HPA axis has has main role to the body stress reaction. Dexmedetomidine can inhibit the stress responses mediated by the sympathetic nervous system. Therefore,the effect of dexmedetomidine to the stress of pituitrin in laparoscopic hysteromyoma surgery is worth to be studied.

Inclusion Criteria:

Surgery will be scheduled as first case in the morning at 9 Am. On arrival to the operation room, intravenous access will be achieved with venous cannula under local anesthesia with 2% lidocaine. Monitoring consisted of 5 lead electrocardiography, pulse oximeter, noninvasive blood pressure, end tidal carbon dioxide, and bispectral index.

Exclusion Criteria:

Diabetic,chronic hypertension,patients on drugs such as beta blockers or calcium channel blockers,pregnant or lactating women, patients with abnormal serum creatinine and blood urea nitrogen, and patients with a history of allergy to drugs particularly α2 agonists.