Prophylactic Use of Intravenous Clonidine Compared to Tramadol in Prevention of Intraoperative Shivering under Regional Anesthesia.

Objectives: This study aimed to evaluate the relative efficacy of prophylactic intravenous (IV) clonidine and tramadol for control of intraoperative shivering following spinal anesthesia.

Materials And Methods: After institutional ethical clearance, 142 patients were chosen from either gender, aged 20-60 years, physical status American Society of Anesthesiology Class I and II scheduled for elective infraumbilical surgery under spinal anesthesia. Patients were randomized into two groups: Group C ( = 71) received injection clonidine 50 μg) IV in 100 ml normal saline (NS) over 10 min and Group T ( = 71) received injection tramadol 50 mg IV.