Anesth Pain Med.  2016 Oct;11(4):404-409. 10.17085/apm.2016.11.4.404.

The efficacy of warming blanket on reducing intraoperative hypothermia in patients undergoing transurethral resection of bladder tumor under general anesthesia

• Hong S
• Yoo BH
• Kim KM
• Kim MC
• Yon JH
• Lee S

• KMID: 2358340
• DOI: http://doi.org/10.17085/apm.2016.11.4.404

Abstract

BACKGROUND
Perioperative hypothermia, defined as a core temperature under 36℃, increases the risk of cardiac complication, bleeding and infection. This study aimed to compare the hypothermia-preventing effects of a warming blanket (Ready-heat®) and one-layer cotton blanket in patients undergoing transurethral resection of the bladder (TURBT) under general anesthesia.
METHODS
Patients undergoing TURBT under general anesthesia were allocated to the warming blanket (N = 23) or one-layer cotton blanket (N = 23) groups. Ten minutes before induction of anesthesia, warming blanket or one-layer cotton blanket was applied according to the assigned group. Tympanic temperature was measured just before induction of anesthesia. Esophageal temperature and tympanic temperature were measured from 20 min after induction of anesthesia at 10-min intervals. Tympanic temperature was measured at 10-min intervals over a 30-min period in the post-anesthesia care unit (PACU). In addition, the incidence and intensity of shivering and thermal comfort were also measured.
RESULTS
The core temperature during general anesthesia showed no significant intergroup difference. The warming blanket group showed a lower incidence of hypothermia at 1 h after induction of anesthesia. Tympanic temperature, the incidence and intensity of shivering, and thermal comfort in the PACU showed no significant intergroup differences.
CONCLUSIONS
Application of the warming blanket or one-layer cotton blanket for 10 min before induction of anesthesia showed no hypothermia-preventing effects. However, at one hour after induction of anesthesia, warming blanket application reduced the incidence of hypothermia to a greater degree than one-layer cotton blanket.

Keyword

Hypothermia; Perioperative period; Prevention; Temperature

MeSH Terms

Anesthesia
Anesthesia, General*
Hemorrhage
Humans
Hypothermia*
Incidence
Perioperative Period
Shivering
Urinary Bladder Neoplasms*
Urinary Bladder*

Figure

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  Fig. 1 Consort flow diagram of the paients.

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  Fig. 2 Mean tympanic temperature and esophageal temperature in patients receiving either warming blanket or one layer cotton blanket decreased during transurethral resection of bladder tumor. There was no significant difference between two groups in mean tympanic temperature and esophageal temperature. *Fisher’s exact test was used.

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