The Effect of Esmolol Versus Dexmedetomidine on Postoperative Pain Control in Endoscopic Sinus Surgery: A Randomized Trial

35 patients will be received i.v. received a loading dose of esmolol 0.5 mg/kg in 30 mL isotonic saline in the IV line, followed by an IV infusion of esmolol 0.05 mg/kg/min. infusion stopped immediately upon extubation.

35 patients will be received dexmedetomidine (Precedex; Abbott Laboratories, North Chicago, Illinois, USA) (vial = 2 ml) 100 mcg/ml at bolus dose of 1 mcg /kg slowly infused over 10 min, then continuous infusion by a rate of 0. 5 mcg /kg/h., infused by a syringe pump. infusion stopped immediately upon extubation.