Razi Journal of Medical Sciences

    Background & Aim: Postanethesia shivering is a common complication of modern anesthesia. With due attention to this point that duration of administration of anesthetic drugs is related to the occurrence of post anesthetic shivering, we studied the effect of duration of anesthesia on the appearance of post anesthesia shivering. Patients and Methods: This double-blind study was performed on 60 patients aged between 20-50 years and ASA class I. Based on duration of anesthesia patients were divided in three groups: In group(1) duration of anesthesia was less than one hour group(2) between 1-3 hours and group(3) between 3-5 hours the amount of post anesthesia shivering was detected at the end of surgery. The anesthesia protocol was similar in the three groups. The results were analysed with chi-square test and Cramer Vi index. Results: Based on our results there was a clear relationship between duration of anesthesia and appearance of post anesthesia shivering. This association becomes more apparent when duration of anesthesia is more than three hours. Conclusion: Increase in duration of anesthesia to more than three hours is a cause for increase in post anesthesia shivering.