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Related Experiment Videos

Efficacy of intraoperative cooling methods

O Plattner1, A Kurz, D I Sessler

  • 1Department of Anesthesia and Perioperative Care, University of California, San Francisco 94143-0648, USA.

Anesthesiology
|November 20, 1997
PubMed
Summary

Comparing five perioperative cooling methods, ice-water immersion provided the fastest core cooling rates. Noninvasive methods like forced air or circulating water are less effective but easier to implement for patients requiring therapeutic hypothermia.

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Area of Science:

  • Medical research
  • Physiology
  • Therapeutic hypothermia

Background:

  • Perioperative cooling is crucial for conditions like malignant hyperthermia crises and neurosurgical therapeutic hypothermia.
  • Evaluating heat transfer and core cooling rates across different methods is essential for clinical application.

Purpose of the Study:

  • To compare the efficacy of five distinct cooling methods in achieving rapid core body temperature reduction.
  • To assess heat transfer and core cooling rates for each method in healthy volunteers.

Main Methods:

  • Six healthy volunteers underwent anesthetization.
  • Five cooling methods were tested: circulating water, forced air, gastric lavage, bladder lavage, and ice-water immersion.
  • Each method was applied for 40 minutes or until core temperature reached 34°C, with rewarming between trials.

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Main Results:

  • Gastric lavage was discontinued due to adverse effects (cramping, diarrhea).
  • Bladder lavage yielded minimal cooling (0.8°C/h).
  • Forced air and circulating water showed comparable, moderate cooling (approx. 1.6-1.7°C/h).
  • Ice-water immersion demonstrated significantly higher cooling rates (9.7°C/h) with a notable afterdrop.

Conclusions:

  • Ice-water immersion is the most effective method for rapid core cooling.
  • Forced-air and circulating-water cooling are less effective but noninvasive and practical for some patients.
  • When noninvasive methods are insufficient, ice-water immersion or peritoneal lavage are recommended for rapid cooling.