COMPARISON OF THE EFFECTS OF INTRATHECAL TRAMADOL AS AN ADJUVANT WITH BUPIVACAINE IN PATIENTS UNDERGOING INFRA-UMBILICAL SURGERIES AT TERTIARY CARE HOSPITAL, KARACHI. RMSR [Internet]. 2025 Jul. 5 [cited 2025 Jul. 12];3(7):110-6. Available from: http://thermsr.com/index.php/Journal/article/view/1442