• Shmuel Evron, Avi Weissman, Vadim Toivis, Dana Baron Shahaf, Jing You, Daniel I Sessler, and Tiberiu Ezri.
• From the *Department of Anesthesia, Wolfson Medical Center, Holon, affiliated to the Sackler Medical Faculty, Tel Aviv University, Israel; †Outcomes Research Consortium, Cleveland, Ohio; ‡Department of Anesthesiology, Rambam Health Care Campus, affiliated to The Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel; §Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio; and ‖Department of Outcomes Research, Anesthesiology Institute, Cleveland, Ohio.
• Anesth. Analg. 2017 Jul 1; 125 (1): 103-109.

BackgroundThe Temple Touch Pro (TTP) is a novel system that estimates core temperature from skin over the temporal artery. We tested the hypothesis that this noninvasive system estimates core temperature to an accuracy within 0.5°C.MethodsCore temperature was continuously monitored in 50 adult and pediatric surgical patients by positioning the sensor patch of a TTP over one temporal artery. The sensor consists of a thermistor array near the skin surface, another set of thermistors above an insulator, and a second insulator between the upper unit and the environment. The sensor measures skin temperature and heat flux, from which the monitor unit estimates core temperature from a proprietary algorithm. Reference core temperature was measured from the esophagus or nasopharynx. We conducted agreement analysis between the TTP and the reference core temperature measurements using the 95% Bland-Altman limits of agreement for repeated measurement data. The proportion of all differences that were within 0.5°C and repeat measures concordance correlation coefficient (CCC) were estimated as well.ResultsTTP and the reference core temperature measurements agreed well in both adults and pediatric patients. Bland-Altman plots showed no evidence of systematic bias or variability over the temperature from 35.2°C to 37.8°C. The estimated 95% lower and upper limits of agreement were -0.57°C (95% confidence interval [CI], -0.76 to -0.41) and 0.57°C (95% CI, 0.44 to 0.71), indicating good agreement between the 2 methods. Ninety-four percentage (95% CI, 87% to 99%) of the TTP temperatures were within 0.5°C of the reference temperature. Good agreement was also supported by an estimated repeated measures CCC of 0.82 (95% CI, 0.66 to 0.91). The TTP core temperature measurements also agreed well with nasopharyngeal reference temperatures.ConclusionsThe noninvasive TTP system is sufficiently accurate and reliable for routine intraoperative core temperature monitoring.

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