Background: We compared the upper and lower body forced-air blanket to prevent perioperative hypothermia, defined as a reduction in body temperature to <36.0°C during the perioperative period, in patients who underwent spinal surgery in prone position.Methods: A total of 120 patients scheduled for elective spine surgery under general anesthesia were divided into an upper warming group (n = 60) and a lower warming group (n = 60). After inducing anesthesia and preparing for the patient for surgery, including prone positioning, the upper and lower bodies of patients in the upper and lower warming groups, respectively, were warmed using a forcedair warmer with specified upper and lower blankets. Body temperature was measured using a tympanic membrane thermometer during the pre-and postoperative periods, and using a nasopharyngeal temperature probe during the intraoperative period. Patients were evaluated in terms of shivering, thermal comfort, and satisfaction in the post-anesthesia care unit (PACU).
Results:The incidence rates of intraoperative and postoperative hypothermia were lower in the upper warming group than in the lower warming group (55.2% vs. 75.9%; P = 0.019, and 21.4% vs. 49.1%; P = 0.002). Perioperative body temperature was higher in the upper warming group (P < 0.001). However, intraoperative blood loss, postoperative thermal comfort scale and shivering scores, patient satisfaction, and PACU duration were similar between the groups.Conclusions: Upper body blanket was more effective in preventing perioperative hypothermia in patients who underwent spinal surgery in prone position than lower body blanket.