Effects of Different Forced-air Warming systems on the Core Temperature of Patients: A Manikin and Multi-center Clinical Study

Purpose: The purpose of this study was to investigate the thermal protective function and running properties of different forced-air warming (FAW) systems in manikin and clinical study. Methods: : Manikin study: Details of methods are provided in the following article. Clinical study: Patients were randomly divided into four groups (Group A; Group B; Group C and Group D), with 30 cases in each group. At the beginning of anesthesia induction, the FAW blanket was turned on and adjusted to 43°C until the end of the operation. The primary outcome was the mean core body temperature in each group during the intraoperative period. Secondary outcomes included the incidence of perioperative surgical-related variables. Results: : Manikin study: The detailed results are shown in the following article. Clinical study: Though the mean perioperative core body temperature was all higher than 36°C in different groups (group A: 36.31±0.04; group B: 36.26±0.06; group C: 36.17±0.03; group D: 36.25±0.05), the core body temperature of patients in group A was higher than the other three groups (P<0.001). The incidence of perioperative hypothermia was lowest in group A, but the difference between the four groups was not statistically significant (group A:4 (13%); group B:7 (23%); group C:11 (37%); group D:7 (23%), P=0.212). Conclusion: For patients undergoing laparoscopic radical resection of colorectal cancer under general anesthesia, four types of FAW systems can effectively prevent the occurrence of perioperative hypothermia, but group A warming system reduced heat loss to a greater extent than other blankets and achieved a better warming effect. Trial registration: ChiCTR2200065394. (Data of Registration: November 3rd, 2022)