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Related Experiment Videos

A comparative study of blood warmer performance.

L Uhl1, D Pacini, M S Kruskall

  • 1Department of Pathology, Charles A. Dana Research Institute, Beth Israel Hospital, Boston, Massachusetts 02215.

Anesthesiology
|November 1, 1992
PubMed
Summary

Rapid blood warming is crucial to prevent hypothermia during massive transfusions. Countercurrent heat exchange devices proved most effective, warming blood to at least 33°C at high flow rates, unlike dry heat or water bath warmers.

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Area of Science:

  • Medical Devices
  • Anesthesiology
  • Critical Care Medicine

Background:

  • Massive blood transfusions can lead to hypothermia and arrhythmias.
  • Rapid blood warming is essential to mitigate these risks.
  • Various blood warming technologies exist, including dry heat, water bath, and countercurrent heat exchange.

Purpose of the Study:

  • To evaluate the speed and efficiency of heat transfer in different blood warming devices.
  • To compare the performance of dry heat, water bath, and countercurrent heat exchange technologies.
  • To identify devices capable of warming blood to safe temperatures at clinically relevant flow rates.

Main Methods:

  • Evaluated six blood warmers representing three technologies: Fenwal, DW-1000, FloTem IIe (dry heat); Hemokinetitherm (water bath); H250, H500 (countercurrent heat exchange).

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  • Assessed heat transfer speed and extent at target flow rates.
  • Standardized experimental conditions for accurate comparison.

    • Main Results:

    • Only the H500 (countercurrent) effectively warmed blood to ≥33°C at ≥250 ml/min.
    • Dry heat and water bath warmers failed to reach ≥33°C at ≥100 ml/min.
    • One water bath device had high flow resistance, limiting testing.

    Conclusions:

    • Countercurrent heat exchange technology is superior for rapid blood warming compared to dry heat and water bath methods.
    • Effective warming to safe temperatures at high flow rates is critical for patient safety.
    • Standardized evaluation protocols are necessary for reliable assessment of blood warming devices.