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Related Experiment Videos

Thermoregulatory vasoconstriction does not impede core warming during cutaneous heating

R Christensen1, D Clough, A Kurz

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

Annals of the New York Academy of Sciences
|March 15, 1997
PubMed
Summary

Thermoregulatory vasoconstriction protects core temperature during mild cooling in anesthesia. However, it is insufficient during vigorous cooling or warming, highlighting the impact of anesthetic-induced vasomotor changes on patient temperature.

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Area of Science:

  • Anesthesiology
  • Physiology
  • Thermoregulation

Background:

  • Perioperative hypothermia is a common complication.
  • Cutaneous-to-core heat transfer significantly influences core body temperature.
  • Anesthesia alters thermoregulatory mechanisms, including vasomotor tone.

Purpose of the Study:

  • To evaluate the role of thermoregulatory vasoconstriction in perioperative heat transfer.
  • To determine the impact of anesthesia on thermoregulation during mild and vigorous thermal stress.
  • To assess the effectiveness of postanesthetic cutaneous warming.

Main Methods:

  • Investigated heat transfer between skin and core in anesthetized subjects.
  • Assessed thermoregulatory vasoconstriction during mild and vigorous cooling.

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  • Evaluated core rewarming rates with and without active cutaneous warming.

    • Main Results:

    • Thermoregulatory vasoconstriction effectively reduces core cooling during mild thermal stress.
    • Vasoconstriction offers only slight protection against core cooling during vigorous cooling.
    • Anesthetic-induced alterations in vasomotor tone are critical for maintaining core temperature.
    • Active cutaneous warming significantly accelerates core rewarming post-anesthesia.

    Conclusions:

    • Thermoregulatory vasoconstriction protects core temperature by limiting heat loss during mild cooling.
    • Anesthetic effects on vasomotor tone are a key determinant of perioperative temperature.
    • Thermoregulatory mechanisms are insufficient to prevent significant temperature changes during vigorous cooling or warming.