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KMID : 1155520160110020211
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Anesthesia and Pain Medicine
2016 Volume.11 No. 2 p.211 ~ p.216
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Effect of electrically heated humidifier on intraoperative core body temperature decrease in elderly patients: a prospective observational study
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Seo Hyung-Seok
Kim Kyung-Mi
Oh Eun-A
Moon Yeon-Jin
Kim Young-Kug
Hwang Jai-Hyun
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Abstract
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Background: Core body temperature (TC) can decrease during general anesthesia. Particularly in elderly patients, more aggressive strategies to prevent intraoperative hypothermia may be required. Here, we investigated the effect of a heated humidifier on intraoperative TC decrease in the elderly.
Methods: Twenty-four elderly patients were randomly assigned into two groups: those who used a heated humidifier (group H) and those who used a conventional ventilator circuit with a heat moisture exchanger (group C). TC was measured continuously at the esophagus at several time-points during surgery.
Results: In group C, TC significantly decreased 90 minutes after skin incision (P < 0.001), while significant differences were not noted in group H during surgery. Comparing the two groups, TC decreased more in group C than in group H at 60, 90, 120, and 150 minutes after skin incision (group C vs. group H: ?0.6°C vs. ?0.3°C, P = 0.025; ?0.7°C vs. ?0.4°C, P = 0.012; ?0.9°C vs. ?0.4°C, P = 0.006; and ?1.0°C vs. ?0.5°C, P = 0.013, respectively). There were no significant differences between the two groups for any other parameters.
Conclusions: A heated humidifier is more effective in preventing intraoperative TC decrease in elderly patients than a heat moisture exchanger. However, further studies with a larger population are required to substantiate its clinical use.
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KEYWORD
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Body temperature, Closed circuit anesthesia, Heating, Humidity, Hypothermia
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