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Related Experiment Videos

Core temperature measurement in the intensive care unit.

D M Nierman1

  • 1Medical Intensive Care Unit, Flushing Hospital Medical Center, NY 11355.

Critical Care Medicine
|June 1, 1991
PubMed
Summary

Pulmonary artery and bladder thermistor catheters provide reliable core body temperature measurements in ICU patients. Tympanic membrane infrared thermometers may give inaccurate high readings and require cautious use.

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Area of Science:

  • Critical Care Medicine
  • Biomedical Engineering
  • Physiology

Background:

  • Accurate core body temperature monitoring is crucial for critically ill patients.
  • Various devices exist for bedside temperature assessment, each with potential limitations.

Purpose of the Study:

  • To compare the accuracy and reliability of three core body temperature measurement devices in intensive care unit (ICU) patients.
  • To evaluate pulmonary artery thermistor catheters, bladder thermistor catheters, and tympanic membrane infrared probes.

Main Methods:

  • A prospective study involving 15 ICU patients with pulmonary artery catheters.
  • Simultaneous core temperature measurements using pulmonary artery thermistor, bladder thermistor, and tympanic membrane infrared probe.
  • In vitro comparison using a water bath and comparison of tympanic probes in emergency department patients.

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Main Results:

  • Pulmonary artery and bladder thermistor catheters demonstrated excellent agreement (bias -0.04°C).
  • Tympanic membrane infrared probe showed significant bias compared to both pulmonary artery (-0.38°C) and bladder (-0.34°C) thermistors.
  • Tympanic readings were consistently higher than thermistor readings in vivo and in vitro.

Conclusions:

  • Pulmonary artery and bladder thermistor catheters offer consistent and reliable bedside core body temperature measurements in ICU settings.
  • Tympanic membrane infrared thermometers may provide erroneously high temperature readings and should be used with caution.