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Morphometric influences on intraoperative core temperature changes

A Kurz1, D I Sessler, E Narzt

  • 1Thermoregulation Research Laboratory, University of California, San Francisco 94143-0648.

Anesthesia and Analgesia
|March 1, 1995
PubMed
Summary
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Intraoperative hypothermia phases are influenced by patient body fat and weight-to-surface area ratio. These morphometric characteristics significantly affect core temperature changes during surgery, particularly during redistribution and linear cooling phases.

Area of Science:

  • Anesthesiology
  • Physiology
  • Surgical Patient Care

Background:

  • Intraoperative core hypothermia progresses through distinct phases: redistribution, linear cooling, and plateau.
  • Understanding factors influencing these phases is crucial for patient management.

Purpose of the Study:

  • To test hypotheses regarding the influence of body fat (BF) and weight-to-surface area (Wt/SA) ratio on intraoperative hypothermia phases.
  • To determine if morphometric characteristics affect core cooling rates during different phases of hypothermia.

Main Methods:

  • Investigated 40 patients undergoing elective colon surgery.
  • Quantified core-to-peripheral heat redistribution, linear core cooling, and plateau phase cooling rates.
  • Correlated hypothermia parameters with patient body fat percentage and Wt/SA ratio.

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Main Results:

  • Redistribution hypothermia was inversely proportional to BF and Wt/SA ratio.
  • Core cooling rate during the linear phase was inversely proportional to the Wt/SA ratio.
  • Thermoregulatory vasoconstriction effectively reduced core cooling rates by four-fold, largely independent of patient morphology.

Conclusions:

  • Patient morphometric characteristics significantly influence intraoperative core temperature changes.
  • The impact of body fat and Wt/SA ratio on hypothermia varies depending on the specific phase of core temperature decrease.