• B Just, V Trévien, E Delva, and A Lienhart.
• Department of Anesthesiology and Intensive Care, Saint-Antoine University Hospital, Paris, France.
• Anesthesiology. 1993 Aug 1;79(2):214-8.

BackgroundIntraoperative hypothermia initially results from internal redistribution of heat facilitated by anesthesia-induced vasodilation. Preinduction skin-surface warming minimizes postinduction hypothermia in anesthetized volunteers. However, its efficacy might be reduced in surgical situations, because of multiple sources of heat loss.MethodsIntraoperative core and mean skin temperatures were measured during total hip arthroplasty in 16 patients, randomly assigned to be covered preoperatively with a warming blanket for > or = 90 min (prewarmed group) or not covered (unwarmed group).ResultsDuring the first hour of anesthesia, core temperature decreased more than twice as much in the unwarmed group (-0.7 +/- 0.1 degree C; mean +/- SE) than in the prewarmed patients (-0.3 +/- 0.1 degree C). At the end of surgery, core temperature was 36.3 +/- 0.1 degree C in the prewarmed group and 35.2 +/- 0.2 degree C in the unwarmed group. During recovery, seven patients obviously shivered in the unwarmed group and none in the prewarmed group.ConclusionsPreanesthetic skin-surface warming reduces the initial postinduction hypothermia in surgical patients, preventing intraoperative hypothermia and postoperative shivering even for procedures lasting 3 h or longer.

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