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Preoperative warming for maintenance of normothermia in women receiving general anesthesia for cesarean delivery
Abstract Number: O1-01
Abstract Type: Original Research
Women undergoing cesarean delivery are vulnerable to adverse effects associated with inadvertent perioperative hypothermia. In mid-2017, we introduced preoperative warming as a strategy to reduce intraoperative hypothermia. We simply provided warm air under the sheet covered by the parturient using forced-air warming system in the operating room. We report the prevalence and extent of hypothermia during cesarean deliveries under general anesthesia at our institution and evaluate the effect of the introduction of preoperative warming.
We performed a retrospective analysis of temperature data in parturients who underwent elective cesarean deliveries under general anesthesia during two-twelve-month periods: September 2017 to August 2018 and 1 years prior to this period (before preoperative warming implementation).
Specifically, the following data were obtained: (i) first measured temperature; (ii) last measured temperature; (iii) percentage of hypothermic case; (iv) percentage of shivering case in postanesthesia care unit (PACU). Data were compared visually and using the Mann–Whitney U-test. Confidence intervals (CI) were obtained using the Hodges–Lehmann estimator.
The average time of active warming before draping was 19.6 ± 4.1 min. Preoperative warming reduced the percentage of hypothermic case (43.0% to 19.7%) and increased the first measured temperature by a median of 0.6°C (P < 0.001, 95% CI 0.4–0.8°C. Additionally, it kept body temperature higher throughout the surgery and reduced the percentage of shivering case in PACU (31.6% to 9.9%).
Short period of preoperative warming prevented a fall in body temperature in parturients undergoing elective cesarean delivery under general anesthesia.