Abstract: Objective To evaluate the clinical application value of non-invasive tympanic temperature sensor HTP102 in continuously monitoring of core body temperature. Methods The tympanic membrane temperature (TMt) and the pulmonary blood temperature (PBt) in patients undergoing off-pump coronary artery bypass grafting (OPCABG) were recorded. The Bland-Altman consistency analysis, intraclass correlation coefficient (ICC),Pearson correlation analysis,and repeated measurement variance analysis were used to investigate the accuracy of the HTP102 during general anesthesia. The relationship between intraoperative condition and prognosis was analyzed with Pearson correlation. Results Bland-Altman showed that the bias and 95% CI were (0.125±0.176 4)℃ and (-0.073 9~0.278 9)℃, respectively. The ICC was 0.968, and Pearson correlation coefficient was 0.938. Repeated measurement variance analysis showed that the time variable F of Roy's maximum root test in the non-spherical multivariate test was 72.95, and the body temperature at each time point was lower than the initial body temperature. Pearson correlation coefficient analysis showed that the correlation between the postoperative intensive care unit (ICU) days and the intraoperative blood loss (P=0.004), postoperative hospital stay and mediastinal drainage 24 hours after operation (P=0.05) were significant.Conclusion HTP102 accurately recorded the intraoperative nuclear temperature. It showed high potential in blood temperature monitoring in other general anesthesia operations. Hypothermia occurred in all patients undergoing OPCABG, especially in the maintenance period of general anesthesia. The prognosis of patients undergoing OPCABG was significantly related to the amount of intraoperative and postoperative bleeding.

Key words: general anesthesia, off-pump coronary artery bypass grafting(OPCABG), tympanic membrane temperature, pulmonary blood temperature, normal temperature