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Perioperative thermal insulation: minimal clinically important differences?

A Bräuer1, T Perl, Z Uyanik

  • 1Department of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Robert-Koch-Str. 40, D-37075 Göttingen, Germany. abraeue@gwdg.de

British Journal of Anaesthesia
|April 21, 2004
PubMed
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The study evaluated operating room insulation materials, finding significant differences in their ability to reduce heat loss. Hospital duvets offered the highest insulation, suggesting potential for improved patient warming strategies.

Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Surgical Technology

Background:

  • Perioperative hypothermia is a risk, managed by thermal insulation.
  • Limited data exists on the thermal properties of operating room insulation materials.

Purpose of the Study:

  • To quantify the thermal insulation properties of various materials used in operating rooms.
  • To compare the effectiveness of different insulating materials in reducing heat loss.

Main Methods:

  • A validated manikin was used to test insulation materials including cotton drapes, specialized drapes, and hospital duvets.
  • Heat flux and surface temperature were measured using heat-flux transducers.
  • The heat exchange coefficient (h) was determined, with insulation being the reciprocal of h.

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Main Results:

  • Air provided an insulation value of 0.61 Clo.
  • Insulation values ranged from 0.17 Clo (two layers of cotton drapes) to 2.79 Clo (two layers of hospital duvet).
  • The Barkey thermcare 1, in two layers, reduced heat loss by 45%.

Conclusions:

  • Significant variations exist in the insulating capabilities of operating room materials.
  • The Barkey thermcare 1 is the most effective commercially available material tested.
  • There is a clear need and opportunity to improve patient insulation in the operating room using advanced materials.