ABSTRACT
Selection of the best analgesic technique in patients undergoing major surgeries can result in lower morbidity and satisfactory postoperative pain relief. In the present study, we tried to compare the effect of morphine and sufentanil on postoperative pain severity and hemodynamic changes by using patient-controlled analgesia [PCA] device in patients who were candidate for coronary artery bypass surgery [CABG]. It was a randomized double-blinded clinical trial in which 120 patients aged 30-65 years, ASA physical status I-Ill, candidate for CABG in Shahid Rajaee hospital in Tehran were included. Before anesthesia, patients were randomly assigned to one of three groups to receive sufentanil [n=40], morphine [n=40] or normal saline [n=40]. After tracheal extubation at intensive care unit, PCA was started by, sufentanil 4mg for the first group, morphine 2mg for the second group and normal saline, at same volume for the third group, intravenously with 10 minute lockout interval. Postoperative pain was evaluated by VAS scale, 1, 6, 12, 18 and 24 hours after extubation and systolic blood pressure, arterial oxygen saturation, PCO2 and PO2 were recorded 24 hours after extubation. VAS scores at rest revealed significantly less pain for patients in sufentanil and morphine groups than normal saline group, throughout the twenty-four hours after operation [P<0.001]. However, there were no significant differences in the means of VAS scores between sufentanil and morphine groups. Among studied hemodynamic parameters, only systolic blood pressure was reduced more in morphine than sufentanil group [P<0.001]. After CABG surgery, administration of intravenous sufentanil and morphine using PCA can lead to similar reduction of postoperative pain severity