Objective  The aim of this study was to observe the feasibility and effectiveness of iThermonitor for continuous monitoring of the core body temperature during ambulatory surgery.

  Methods  The body temperatures of patients who underwent ambulatory surgery in West China Hospital from October 25 to December 8, 2017 were prospectively collected. Each set of data included the esophageal temperature, rectal temperature, and armpit temperature measured by iThermonitor.The esophageal temperature was used as the standard and subtracted from the armpit temperature and rectal temperature, respectively. SAS and R softwares were used for consistent analysis.

  Results  A total of 113 patients meeting the inclusive and exclusive criteria were enrolled in this study, and 1451 sets of intraoperative temperature data were collected.The armpit temperature measured by iThermonitor was (0.06±0.26)℃ lower, while the rectal temperature was (0.39±0.23)℃ higher than the esophageal temperature. In terms of the correlation coefficient, iThermonitor temperature (r=0.9331) was closer to the esophageal temperature than the rectal temperature (r=0.8431). In respect of theproportion of falling into the esophageal temperature ±0.5℃, armpit temperature was 94.97% and the rectal temperature was 78.91%.

  Conclusion  iThermonitor might be effectively used to monitor the core body temperature of adult patients during ambulatory surgery.