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Related Experiment Videos

Thermoregulatory vasoconstriction impairs active core cooling

A Kurz1, D I Sessler, F Birnbauer

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

Anesthesiology
|April 1, 1995
PubMed
Summary

Thermoregulatory vasoconstriction significantly slows cooling during neurosurgery, delaying target hypothermia by nearly an hour. This effect impacts the speed of achieving therapeutic hypothermia in patients.

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Area of Science:

  • Neurosurgery
  • Thermoregulation
  • Hypothermia

Background:

  • Hypothermia is increasingly used in neurosurgery to improve outcomes.
  • Active cooling is often necessary to achieve target temperatures below 34°C.
  • Thermoregulatory vasoconstriction can impair active cooling efficacy by reducing heat loss.

Purpose of the Study:

  • To test the hypothesis that thermoregulatory vasoconstriction reduces the efficacy of active cooling during neurosurgery.
  • To evaluate the impact of different anesthetic agents on vasoconstriction during hypothermia.

Main Methods:

  • Patients undergoing neurosurgery were anesthetized with isoflurane/nitrous oxide or propofol/fentanyl.
  • A forced-air cooling device was used to lower core temperature to 32°C.

Related Experiment Videos

  • Vasoconstriction was assessed by skin-temperature gradients, with the threshold identified when forearm minus fingertip temperature was 0°C.

    • Main Results:

    • Vasoconstriction occurred at a core temperature of approximately 34.5°C in both anesthetic groups.
    • Patients who maintained vasodilation cooled faster than those who developed vasoconstriction.
    • Vasoconstriction led to an approximately 1-hour delay in reaching target core temperatures of 33°C and 32°C.

    Conclusions:

    • While forced-air cooling limits a complete temperature plateau, vasoconstriction significantly slows the rate of hypothermia development.
    • The observed delay in reaching target temperatures due to vasoconstriction may have clinical significance.
    • Anesthetic choice did not alter cooling rates, but maintaining vasodilation accelerated cooling.