Methods and Material:
62 male patients up to 75 yrs old scheduled for elective on-pump CABG with ejection fraction>40% were assigned to two groups according to DSM- IV, TR: Opium dependent and nondependent patients. Anesthesia induced and maintained similarly in all patients. During the perioperative period blood pressure(BP),heart rate (HR, central venous pressure (CVP),cardiac output (co),systemic vascular resistance (SVR) ,type and length of inotropes used and the frequency of intra aortic balloon pump (IABP) insertion were monitored and recorded . Paired sample t-test, Independent sample t- test and Chi-Square test were used to compare variables among two groups.