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Background: Inadvertent postoperative hypothermia is common among anesthetized patients in the operating room. Although prophylaxis guideline has been applied to every patient, hypothermia still occurred and continued to increase in PACU (Post anesthesia care unit).
Objective: To identify the incidence and to assess the risk of postoperative hypothermia in obstetric and gynecologic patients at Ramathibodi Hospital.
Methods: After ethical approval, a prospective observational study was conducted on obstetric and gynecologic patients undergoing surgery under anesthesia during October 2012 to December 2012. The hypothermia was defined as a core temperature of below 36.0 °C. Outcomes were analyzed and compared between G1: < 35.0 °C group and G2: 35.0 - 36.0 °C group. The possible factors of postoperative hypothermia were collected by using research data sheet. Tympanic membrane temperature was recorded on admission to PACU and before discharge.
Results: The 919 patients were in this study, a subgroup of 456 patients had body temperature of lower than 36.0 °C (49.62%). The G1 group comprised 37 patients (8.11%) and G2 group comprised 419 patients (97.89%). Of these, mean age was 37.94 ± 12.66 years, mean body weight was 62.83 ± 12.27 kg, mean operating room temperature was 20.97 ± 1.53 °C and the mean operation time was 91.90 ± 60.98 min. Parameters associated with hypothermia were caesarean section, laparoscopic surgery and operating room temperature (P = 0.019, 0.003, and 0.014, respectively). The risk factors significantly associated with < 35.0 °C were laparoscopic and operating room temperature of below 20.0 °C.
Conclusions: The incidence of postoperative hypothermia in obstetric and gynecologic patients at Ramathibodi Hospital was 49.62%. The risk factors associated with postoperative hypothermia with the temperature of below 35.0 °C were laparoscopic surgery and operating room temperature of below 20.0 °C.
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