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Incidence and Associated Factors of Hypothermia with Abdominal Surgery under
Wireless Temperature Monitoring

M. Fan, Y. Liu, R. Gong, and R. Xu 1
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Department of Biliary Surgery, West China Hospital of Sichuan University, China
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Background: Inadvertent perioperative hypothermia is a common clinical issue and is associated
with many negative outcomes such as infection, a prolonged stay in hospital, and increased
hospitalization costs.

Objective: To examine the incidence and factors associated with perioperative hypothermia in
patients undergoing abdominal surgery under wireless temperature monitoring.

Methods: A retrospective cohort study using electronic medical records data from September 2019
and July 2021. The severity of hypothermia was measured by calculating the 36°C AUC (area below
36°C and above the temperature curve) from minimum temperature and duration of hypothermia.
With 36°C AUC median as the dividing point, the severity of hypothermia was divided into two groups
to determine the influencing factors of different severity of hypothermia.

Results: A total of 3198 patients were analyzed, the incidence of perioperative hypothermia
was 46.1%. Of the 737 patients with inflatable insulation blanket, the incidence of intraoperative
hypothermia was 59.7%. 37.5% patients experienced hypothermia continuously for more than 2 hours
after the end of anesthesia. Associated factors of moderate/severe hypothermia were advanced age
(OR=1.69, 95%CI 1.289-2.216, P=0.001), low BMI (OR=0.955, 95%CI 0.915-0.997, P=0.036), low temperature
at induction of anesthesia (OR=0.007, 95%CI 0.004-0.010, P=0.001), malignant tumor (OR=0.338, 95%CI
0.194-0.591, P=0.001), long duration of preparation (OR=1.015, 95%CI 1.003-1.027, P=0.014), volume of
Oral Presentation Abstracts
intraoperative fluids more than 2000 ml (OR=2.155, 95%CI 1.114-4.168, P=0.023), duration of anesthesia
more than 3 hours (OR=2.062, 95%CI 1.1147-3.707, P=0.016) and used patient-control analgesia after
surgery (OR=1.998, 95%CI 1.288-3.100, P=0.002).

Conclusion: Perioperative hypothermia remains a common issue. Patients who used after
patient-control analgesia surgery and malignant tumor are more prone to hypothermia. Therefore,
the awareness of ward nurses to monitor temperature of patients at high risk should be improved.
It is also necessary to strengthen the management of postoperative patient insulation measures in
wards.

Keywords: inadvertent perioperative hypothermia, wireless temperature monitoring, risk factors,
incidence

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Correspondence: Yuwei Liu, Department of Biliary Surgery, West China Hospital of Sichuan University, China
E-mail: 308300668@qq.com

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