COMPARISON OF THE EFFECTS OF INTRATHECAL TRAMADOL AS AN ADJUVANT WITH BUPIVACAINE IN PATIENTS UNDERGOING INFRA-UMBILICAL SURGERIES AT TERTIARY CARE HOSPITAL, KARACHI. The Research of Medical Science Review, [S. l.], v. 3, n. 7, p. 110–116, 2025. Disponível em: http://thermsr.com/index.php/Journal/article/view/1442.. Acesso em: 12 jul. 2025.