the preventive role of low-dose intravenous ketamine on postoperative shivering in children: a placebo randomized controlled trial

conclusions administration of intravenous ketamine at a dosage of 0.5 mg/kg immediately after anesthesia induction had a preventive effect on shivering intensity without hemodynamic alterations in children undergoing general anesthesia for tonsillectomy. results with regards to the demographic and surgical data, no significant differences between the two study groups were observed (p ≥ 0.05). shivering intensity in children who had received ketamine was significantly lower than children who had not received ketamine, at t0, t10, t20, and t30 after arrival (p < 0.05). there were no significant differences in hallucination, nausea, vomiting, hemodynamic dysfunction, blurred vision, and seizure in the k group compared with the n group (p ≥ 0.05). background postoperative shivering is a major problem in children undergoing general anesthesia. objectives the aim of the present study was to investigate the role of low-dose intravenous ketamine for prevention of shivering after induction of general anesthesia in children who had undergone tonsillectomy. patients and methods this was a randomized, double-blinded, placebo-controlled trial including 80 children, of american society of anesthesiologists (asa) physical status i or ii, scheduled for tonsillectomy under general anesthesia who were randomly assigned to an intravenous ketamine (0.5 mg/kg, n = 40; group k) group or matched dose placebo (n = 40; group n) group. surgical and demographic data, unexpected side effects, and the occurrence of shivering for each child were assessed by a blinded observer at the following time points: t0, in the recovery room; t10, at 10 minutes; t20, at 20 minutes; t30, and at 30 minutes.