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Related Experiment Videos

Leg heat content continues to decrease during the core temperature plateau in humans anesthetized with isoflurane

K Belani1, D I Sessler, A M Sessler

  • 1University of Minnesota, Minneapolis.

Anesthesiology
|May 1, 1993
PubMed
Summary
This summary is machine-generated.

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Thermoregulatory vasoconstriction significantly slows core body cooling during anesthesia. This response helps maintain a stable core temperature by redirecting heat, despite ongoing body heat loss.

Area of Science:

  • Anesthesiology
  • Physiology
  • Thermoregulation

Background:

  • Thermoregulatory responses during anesthesia are known but their clinical significance is unclear.
  • Nonshivering thermogenesis does not increase heat production in anesthetized adults.
  • Vasoconstriction reduces heat loss but may not achieve thermal steady state.

Purpose of the Study:

  • To test if thermoregulatory vasoconstriction prevents further core hypothermia.
  • To determine if the stable core temperature represents a thermal steady state or continued body heat loss.

Main Methods:

  • Six healthy volunteers were anesthetized and paralyzed.
  • Core hypothermia was induced via fan cooling for 3 hours post-vasoconstriction.
  • Leg heat content was calculated using thermocouples and skin temperature.

Related Experiment Videos

Main Results:

  • Core temperature decreased by 1.0°C in the hour before vasoconstriction, and only 0.4°C in the subsequent 3 hours.
  • Leg heat content decreased by 49 kcal in the 3 hours after vasoconstriction.
  • A significant reduction in the rate of core cooling was observed post-vasoconstriction.

Conclusions:

  • Thermoregulatory vasoconstriction clinically reduces the rate of core cooling during anesthesia.
  • A plateau in core temperature is achieved partly by heat sequestration to the core.
  • Body heat content continues to decrease despite a stable core temperature.