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Shivering during epidural anesthesia.

D I Sessler1, J Ponte

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

Anesthesiology
|May 1, 1990
PubMed
Summary
This summary is machine-generated.

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Epidural anesthesia can cause shivering, which is a normal thermoregulatory response to hypothermia. This shivering is not linked to injectate temperature and does not affect the sensation of cold.

Area of Science:

  • Anesthesiology
  • Physiology
  • Thermoregulation

Background:

  • Epidural anesthesia can induce hypothermia and shivering.
  • The precise mechanisms and subjective experiences of these responses are not fully understood.

Purpose of the Study:

  • To investigate if shivering during epidural anesthesia is thermoregulatory.
  • To determine if hypothermia causes a subjective sensation of cold.
  • To assess the impact of injectate temperature on tremor intensity.

Main Methods:

  • Ten healthy volunteers received epidural lidocaine injections at varying temperatures.
  • Skin and tympanic membrane temperatures, vasoconstriction, and electromyographic (EMG) intensity were monitored.
  • Subjective thermal comfort was assessed using a visual analog scale.

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Main Results:

  • Hypothermia and vasoconstriction preceded tremor, which occurred more frequently in unwarmed volunteers.
  • Injectate temperature did not significantly affect tremor intensity.
  • Tremor onset correlated with a 0.5°C decrease in tympanic membrane temperature.
  • Subjective thermal comfort paradoxically increased with decreasing tympanic temperatures.

Conclusions:

  • Shivering during epidural anesthesia is a normal thermoregulatory response to hypothermia.
  • Hypothermia induced by epidural anesthesia does not produce a subjective sensation of cold.
  • Injectate temperature does not influence tremor intensity.