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Related Experiment Videos

Continuous cardiac output determination by thermodeprivation.

K Miyasaka1, G Volgyesi, M Katayama

  • 1Pathophysiology Research Laboratory, National Children's Medical Research Center, 3-35-31 Taishido, Setagaya, Tokyo, Japan.

Journal of Anesthesia
|July 1, 1991
PubMed
Summary

A new KATS catheter enables continuous cardiac output monitoring using thermodeprivation. This innovative device maintains conventional function and shows promise for real-time hemodynamic assessment.

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Area of Science:

  • Cardiovascular physiology
  • Medical device engineering

Background:

  • Continuous cardiac output monitoring is crucial for hemodynamic management.
  • Existing methods like thermodilution have limitations for continuous assessment.

Purpose of the Study:

  • To develop and evaluate a modified thermodilution catheter (KATS catheter) for continuous cardiac output monitoring.
  • To assess the feasibility of using thermodeprivation for real-time cardiac output measurement.

Main Methods:

  • A novel KATS catheter with an additional, heated thermistor near the tip was designed.
  • Thermodeprivation principle: heat loss from the thermistor is correlated with blood velocity.
  • In vitro studies were used to empirically derive the cardiac output formula.

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Main Results:

  • The KATS catheter demonstrated significant correlation with conventional thermodilution and electromagnetic flowmeter readings in dogs.
  • The device successfully monitored continuous cardiac output in an animal model.
  • The empirical formula accounted for factors beyond blood flow affecting heat deprivation.

Conclusions:

  • The KATS catheter is a promising new technology for continuous cardiac output measurement.
  • This technique offers a potential advancement over intermittent monitoring methods.
  • Further validation in clinical settings is warranted.