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Korean J Anesthesiol. 2014 May;66(5):352-7. doi: 10.4097/kjae.2014.66.5.352. Epub 2014 May 26.

Comparison of the efficacy of a forced-air warming system and circulating-water mattress on core temperature and post-anesthesia shivering in elderly patients undergoing total knee arthroplasty under spinal anesthesia.

Author information

1
Department of Anesthesiology and Pain Medicine, Chungju Hospital, Konkuk University Medical School, Chungju, Korea.
2
Department of Pediatrics, Chungju Hospital, Konkuk University Medical School, Chungju, Korea.

Abstract

BACKGROUND:

In the present study, we compared changes in body temperature and the occurrence of shivering in elderly patients undergoing total knee arthroplasty under spinal anesthesia during warming with either a forced-air warming system or a circulating-water mattress.

METHODS:

Forty-six patients were randomly assigned to either the forced-air warming system (N = 23) or circulating-water mattress (N = 23) group. Core temperature was recorded using measurements at the tympanic membrane and rectum. In addition, the incidence and intensity of post-anesthesia shivering and verbal analogue score for thermal comfort were simultaneously assessed.

RESULTS:

Core temperature outcomes did not differ between the groups. The incidence (13.0 vs 43.5%, P < 0.05) and intensity (20/2/1/0/0 vs 13/5/3/2/0, P < 0.05) of post-anesthesia shivering was significantly lower in the forced-air system group than in the circulating-water mattress group.

CONCLUSIONS:

The circulating-water mattress was as effective as the forced-air warming system for maintaining body temperature. However, the forced-air warming system was superior to the circulating-water mattress in reducing the incidence of post-anesthesia shivering.

KEYWORDS:

Shivering; Spinal anesthesia; Temperature

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