Accuracy of the non-invasive Tcore™ temperature monitoring system to measure body core temperature in abdominal surgery
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An accurate determination of body core temperature is crucial during surgery in order to avoid and treat hypothermia, which is associated with poor outcome. In a prospective observational study, we evaluated the suitability of the Tcore™ device (Drägerwerk AG & Co. KGaA, Lübeck, Germany)—a non-invasive thermometer—to accurately determine core body temperature. In patients undergoing surgery for ovarian cancer, core body temperature (CBT) was determined with the Tcore™ sensor attached to the forehead and compared with blood temperature (Tblood) as measured within the femoro-iliacal artery. Both temperatures were recorded every 10 s and the measurement error was calculated. 57,302 data pairs of CBT and Tblood were obtained in 22 patients. In a repeated-measurements version of the Bland and Altman test, a bias of − 0.02 °C and 95% limits of agreement of − 0.48 to 0.44 °C were calculated. In a population analysis, a median absolute error of 0 [− 0.1; + 0.1] °C, a bias of 0 [− 0.276; 0.271] % and an inaccuracy of 0.276 [0.274; 0.354] % was determined. Although the Tcore™ sensor was attached to the frontal skin, it provided an accurate measurement of core body temperature in the investigated intraoperative setting.
KeywordsAnaesthesia Core body temperature Abdominal surgery Thermometer
The complimentary provision of Tcore™ sensors by the manufacturer, Drägerwerk AG & Co.KGaA, Lübeck, Germany is gratefully acknowledged. The manuscript contains part of the doctoral thesis of HD.
Compliance with ethical standards
Conflict of interest
SZ has received consultancy fees and travel reimbursement from Drägerwerke AG & Co. KGaA in the past on projects unrelated to the investigated device. This study did not receive any support from the manufacturer other than provision of the device and disposable materials free of charge.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
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