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Heat flow and distribution during epidural anesthesia

T Matsukawa1, D I Sessler, R Christensen

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

Anesthesiology
|November 1, 1995
PubMed
Summary
This summary is machine-generated.

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Core hypothermia after epidural anesthesia is primarily caused by body heat redistribution to the extremities. This heat shift, mainly to the legs, significantly lowers core body temperature during anesthesia.

Area of Science:

  • Anesthesiology
  • Physiology
  • Thermoregulation

Background:

  • Epidural anesthesia can lead to core hypothermia through heat redistribution and environmental heat loss.
  • The relative contributions of these two mechanisms to hypothermia are not fully understood.

Purpose of the Study:

  • To evaluate regional body heat content changes.
  • To determine the extent to which core hypothermia results from altered heat balance and internal heat redistribution after epidural anesthesia.

Main Methods:

  • Twelve male volunteers were monitored for heat balance and regional tissue heat content before and after epidural anesthesia.
  • Heat redistribution was calculated by subtracting the change in mean body temperature from the change in core temperature.

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Main Results:

  • Arm heat content decreased, while leg heat content increased significantly after anesthesia induction.
  • Redistribution accounted for 89% of the core temperature decrease in the first hour and 62% over three hours.
  • Overall, redistribution contributed 80% to the total core hypothermia observed.

Conclusions:

  • Core hypothermia during epidural anesthesia is largely driven by body heat redistribution from the core to the legs.
  • Redistribution remains the primary cause of hypothermia even after prolonged anesthesia.
  • Core temperature decrease was less severe than with general anesthesia due to maintained metabolic rate and vasoconstriction.