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. 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

Hye Young Kim  1 , Kyu Chang Lee  1 , Myeong Jong Lee  1 , Mi-Na Kim  1 , Ji-Sub Kim  1 , Won Sang Lee  1 , Jung Hwa Lee  2
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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

Hye Young Kim et al. Korean J Anesthesiol. 2014 May.

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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Figures

Fig. 1
Fig. 1
Changes in core (rectal) temperature over time in patients undergoing total knee arthroplasty and warmed with forced-air (n = 23) or circulating-water (n = 23) group. First rectal temperature recorded after initial equilibration.
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