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Related Experiment Videos

Optimal duration and temperature of prewarming

D I Sessler1, M Schroeder, B Merrifield

  • 1Thermoregulation Research Laboratory, University of California, San Francisco 94143-0648.

Anesthesiology
|March 1, 1995
PubMed
Summary

Prewarming patients before anesthesia effectively prevents hypothermia by increasing peripheral heat content. Even short prewarming durations significantly boost heat stores, outweighing potential discomforts.

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Area of Science:

  • Anesthesiology
  • Thermoregulation
  • Patient Safety

Background:

  • Core hypothermia post-anesthesia stems from heat redistribution.
  • Prewarming can prevent this but may be limited by sweating or discomfort.
  • Optimal prewarming parameters are crucial for efficacy.

Purpose of the Study:

  • To determine the optimal heater temperature and minimum duration for prewarming.
  • To evaluate the impact of prewarming on preventing redistribution hypothermia.

Main Methods:

  • Seven volunteers underwent two study days with forced-air warming (medium/high settings).
  • Evaluated sweating, thermal comfort, and extremity heat content using thermocouples and skin temperatures.
  • Measured arm and leg tissue heat content.

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Main Results:

  • Significant increases in arm and leg heat content observed within 30 minutes and 1 hour of warming.
  • Heater settings of medium (~40°C) and high (~43°C) showed comparable efficacy in initial heat gain.
  • Sweating and discomfort occurred later, not limiting initial heat transfer.

Conclusions:

  • Prewarming effectively increases peripheral heat content, preventing hypothermia.
  • Thirty minutes of prewarming provides substantial peripheral heat gain, exceeding redistribution losses.
  • Prewarming is an effective strategy to mitigate intraoperative hypothermia.