Background: Shivering is a common occurrence in anesthesia practice. It is an involuntary,Â rhythmic and intermittent muscle contraction beginning in the head & neck, extending to the extremities and culminating in generalized shaking. Objective: The present study was conducted with the aim of comparing response time and efficacy of pethidine and butorphanol for relief of postspinal shivering.We also compared the relapse of shivering and associated side effects. Methods: 60 patients of American Society of Anesthesiologist grade I and II, aged 18-60 yrs, belonging to either sex, scheduled for elective surgery under spinal anesthesia were included in the study. Patients wereÂ randomly allocated to three groups ofÂ Â twenty each to receiveÂ either pethidine 25mg (Group A), butorphanol 1 mg (Group B) or normal saline 0.9% (Group C) in equal volume, on occurrence of shivering. Result: It was observed that the mean response timeÂ was significantly less in Group B (1.59Â±0.79min) compared toÂ Group A (3.83Â±1.7min) and Group C (13.53Â±1.5min).Â Success rateÂ ofÂ butorphanol (Group B) was 95% compared to pethidine (Group A) 85% and saline (Group C) 15%.Â Relapse of shivering was observed more inÂ patientsÂ of Group A (11.7%) as compared to Group B (5.3%) while shivering reappeared in all the patients who responded toÂ saline treatment. Among the side effects, nausea was seenÂ only inÂ Â Group A (10%)Â Â while sedation was found more with group B (20%) compared to Group A (10%) and Group C(0%).Conclusion: Butorphanol is better than pethidine for control of postspinal shivering withÂ more rapid responseÂ and lesser recurrence rate but is more sedating.
ÂKey words: Regional anesthesia, Perioperative shivering, Butorphanol, Pethidine.