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Related Experiment Videos

Facial warming increases the threshold for shivering.

P A Iaizzo1, Y M Jeon, D C Sigg

  • 1Department of Anesthesiology, University of Minnesota, Minneapolis 55455, USA.

Journal of Neurosurgical Anesthesiology
|October 20, 1999
PubMed
Summary
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Focal facial warming can suppress shivering, enabling therapeutic mild hypothermia for neurological injury patients. This non-pharmacological method may improve outcomes in emergency situations like head trauma or stroke.

Area of Science:

  • Neuroscience
  • Physiology
  • Medical Technology

Background:

  • Therapeutic hypothermia, a 1-2°C core temperature decrease, protects against cerebral ischemia.
  • Shivering in unanesthetized patients often prevents effective core temperature reduction.
  • Pharmacological suppression of shivering may be required for therapeutic hypothermia.

Purpose of the Study:

  • To investigate if facial and airway warming increases the shivering threshold.
  • To determine if this method enables core cooling in unanesthetized patients.
  • To assess the potential for non-pharmacological induction of mild hypothermia.

Main Methods:

  • Seven healthy male volunteers underwent a dynamic cooling protocol using a water mattress and air coverlet.
  • Focal facial and airway warming was applied to suppress involuntary motor activity.

Related Experiment Videos

  • Core (tympanic, axillary, rectal) and cutaneous temperatures, heart rate, blood pressure, and a shiver index were monitored.

    • Main Results:

    • Without facial warming, cooling attempts led to widespread shivering, preventing core temperature reduction.
    • Application of focal facial warming rapidly suppressed motor activity (shivering) in all subjects.
    • Following warming, core temperatures significantly decreased within minutes.

    Conclusions:

    • Focal facial warming effectively suppresses shivering during whole-body cooling.
    • This technique may reduce the need for pharmacological agents to induce mild hypothermia.
    • This non-invasive method could be valuable for rapidly initiating cerebral hypothermia in neurological emergencies.