Dexmedetomidine vs Control on Attenuation Hemodynamic Response to Noxious Stimuli in CABG Surgical Patients

Dexmedetomidine(Precedex Pfizer) prepared in concentration 0.1 mcg/kg/ml total volume50 ml by nurse anesthetist at preprocedure room, start dexmedetomidine by anesthesiologist at operating room loading 60 ml/hour for 10 minutes before induction of anesthesia then 5ml/hour until the patient on cardiopulmonary bypass (loading 1mcg/kg in 10 minutes then 0.5 mcg/kg/hour). Record patients data by nurse anesthetist

Normal Saline total volume50 ml prepared by nurse anesthetist at preprocedure room, start Normal Saline by anesthesiologist at operating room loading 60 ml/hour for 10 minutes before induction of anesthesia then 5ml/hour until the patient on cardiopulmonary bypass. Record patients data by nurse anesthetist