Anesth Pain Med.  2018 Oct;13(4):447-453. 10.17085/apm.2018.13.4.447.

The effect of 10 minutes of prewarming for prevention of inadvertent perioperative hypothermia: comparison with 30 minutes of prewarming

• Yoo JH
• Ok SY
• Kim SH
• Park SY
• Han YM
• Kim D

• KMID: 2436007
• DOI: http://doi.org/10.17085/apm.2018.13.4.447

Abstract

BACKGROUND
At least 30 minutes of pre-warming has been recommended for the prevention of redistribution hypothermia. However, it has been reported that less than 30 minutes of pre-warming is also effective. The aim of this study was to evaluate the ability of 10 minutes of pre-warming to prevent inadvertent perioperative hypothermia. Results were compared with 30 minutes of pre-warming.
METHODS
In this prospective randomized study, 59 patients scheduled for elective surgery less than 120 minutes under general anesthesia were divided into 2 groups: the first group was pre-warmed for 10 minutes (n = 30), the second group for 30 minutes (n = 29). The patients were pre-warmed for 10 or 30 minutes in the pre-anesthetic area using a forced-air warmer. When the patients' body temperatures decreased below 36℃, we warmed them with a forced-air warmer intraoperatively and postoperatively. Body temperatures were recorded during perioperative periods. Shivering and thermal comfort were evaluated in the pre-anesthetic area and post-anesthesia care unit.
RESULTS
The incidence of intraoperative and postoperative hypothermia were not significantly different (P > 0.05). However, the temperatures were higher in the 30 minute group from the post-warming time to 90 minutes after anesthetic induction (P < 0.05).
CONCLUSIONS
Ten minutes of pre-warming has the same effectiveness as 30 minutes of pre-warming for preventing inadvertent perioperative hypothermia. It is a preferable choice for the patients scheduled for surgery less than 120 minutes under general anesthesia.

Keyword

Forced-air warming; Perioperative hypothermia; Preoperative warming

MeSH Terms

Anesthesia, General
Body Temperature
Humans
Hypothermia*
Incidence
Perioperative Period
Prospective Studies
Shivering

Figure

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  Fig. 1 CONSORT diagram of the Study. Group 10 min: the group of prewarming for 10 minutes, Group 30 min: the group of prewarming for 30 minutes.

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  Fig. 2 Perioperative temperature. Error bars indicate ± 1SD of temperature at each time. Preoperative and postoperative core temperature of the patients was measured using tympanic membrane thermometer. Intraoperative core temperature of the patients was recorded every 15 minutes after anesthetic induction using nasopharyngeal probe. the temperature was higher in group 30 minutes from post-warming time to 90 minutes after anesthetic induction prewarming. *P < 0.05, †P < 0.001. At arrival preoperative area: immediate after arrival of preoperative area, After warming: immediate after the end of warming, After anesthetic induction: immediate after anesthetic induction, At arrival PACU (post anesthesia care unit): immediate after arrival of PACU, PACU 10, 20, 30 min: 10, 20, 30 minutes after arrival of PACU.

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