4.7 Article

Accuracy of zero-heat-flux thermometry and bladder temperature measurement in critically ill patients

Journal

SCIENTIFIC REPORTS
Volume 10, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41598-020-78753-w

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Funding

  1. Projekt DEAL

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Core temperature (T-Core) monitoring is essential in intensive care medicine. Bladder temperature is the standard of care in many institutions, but not possible in all patients. We therefore compared core temperature measured with a zero-heat flux thermometer (T-ZHF) and with a bladder catheter (T-Bladder) against blood temperature (T-Blood) as a gold standard in 50 critically ill patients in a prospective, observational study. Every 30 min T-Blood, T-Bladder and T-ZHF were documented simultaneously. Bland-Altman statistics were used for interpretation. 7018 pairs of measurements for the comparison of T-Blood with T-ZHF and 7265 pairs of measurements for the comparison of T-Blood with T-Bladder could be used. T-Bladder represented T-Blood more accurate than T-ZHF. In the Bland Altman analyses the bias was smaller (0.05 degrees C vs. - 0.12 degrees C) and limits of agreement were narrower (0.64 degrees C to - 0.54 degrees C vs. 0.51 degrees C to - 0.76 degrees C), but not in clinically meaningful amounts. In conclusion the results for zero-heat-flux and bladder temperatures were virtually identical within about a tenth of a degree, although T-ZHF tended to underestimate T-Blood. Therefore, either is suitable for clinical use.German Clinical Trials Register, DRKS00015482, Registered on 20th September 2018, http://apps.who.int/trialsearch/Trial2.aspx?TrialID=DRKS00015482.

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