Accuracy and precision of a novel non-invasive core thermometer

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Accuracy and precision of a novel non-invasive core thermometer O. Kimberger, R. Thell, M. Schuh, J. Koch, D.I. Sessler, A. Kurz British Journal of Anaesthesia Volume 103, Issue 2, Pages 226-231 (August 2009) DOI: 10.1093/bja/aep134 Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 1 Two temperatures are measured: Th1 for skin temperature and Th2 for ‘environment-side’ temperature. The heat coefficient of the insulating material (Ks) is known. An additional parameter that has to be taken in account is the estimated heat transfer coefficient of human tissue (Kg). A formula for calculating core temperature with an empiric human tissue heat transfer coefficient using the double-sensor is thus: T core = T h 1 + ( K s / K g ) ( K h 1 − T h 2 ) . British Journal of Anaesthesia 2009 103, 226-231DOI: (10.1093/bja/aep134) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 2 Bland–Altman plot comparing the distal oesophageal and double-sensor temperature measurements (n=1287). The x-axis is the average of the two measurements. The y-axis is the bias that is the difference of the two measurements (oesophageal−double-sensor). Bias: −0.08°C; limits of agreement: ±0.58°C. British Journal of Anaesthesia 2009 103, 226-231DOI: (10.1093/bja/aep134) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 3 Bland–Altman plot comparing the forehead and double-sensor temperature measurements (n=1287). The x-axis is the average of the two measurements. The y-axis is the bias that is the difference of the two measurements (oesophageal−double-sensor). Bias: −0.56°C; limits of agreement: ±1.54°C. British Journal of Anaesthesia 2009 103, 226-231DOI: (10.1093/bja/aep134) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions