Although thoracic epidural anaesthesia has been studied and practiced, there is paucity of literature on the effects of intrathecal morphine on the postoperative hemodynamics in the cardiac-surgical patients.Hence, the investigators planned this study to compare the post-operative hemodynamic effects and outcome of combined light general anesthesia + high spinal block, with or without intrathecal morphine in patients undergoing cardiac-surgical procedures in our set up.