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Related Experiment Videos

Placement considerations for measuring thermodilution right ventricular ejection fractions.

F G Spinale1, J L Zellner, R Mukherjee

  • 1Department of Surgery, Medical University of South Carolina, Charleston.

Critical Care Medicine
|March 1, 1991
PubMed
Summary
This summary is machine-generated.

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Thermodilution accurately measures right ventricular ejection fraction (RVEF) in large hearts. Optimal catheter placement is crucial, as distance from the injectate port to the tricuspid valve significantly impacts RVEF measurements.

Area of Science:

  • Cardiovascular physiology
  • Diagnostic imaging techniques
  • Hemodynamic monitoring

Background:

  • Clinical assessment of right ventricular (RV) function is challenging due to difficulties in measuring RV volumes and ejection fraction.
  • Thermodilution offers a potential method for assessing RV performance, but its accuracy is dependent on proper catheter positioning.

Purpose of the Study:

  • To investigate the impact of catheter positioning on thermodilution-derived right ventricular ejection fraction (RVEF) measurements.
  • To determine the reliability of thermodilution for RVEF assessment in large animal models.

Main Methods:

  • Six pigs (80-100 kg) were instrumented with thermodilution and arterial catheters.
  • RVEF was measured using thermodilution with varying distances between the pulmonary valve and thermistor, and the injectate port and tricuspid valve.

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  • Measurements were taken at a baseline heart rate and during pacing-induced tachycardia.

    • Main Results:

    • Thermistor position (0-10 cm from pulmonary valve) did not significantly affect RVEF measurements at either heart rate.
    • Increased distance (5-7 cm) between the injectate port and tricuspid valve led to a significant reduction in RVEF.
    • This reduction in RVEF was more pronounced during tachycardia.

    Conclusions:

    • Thermodilution is a reliable method for obtaining RVEF measurements.
    • In large hearts, thermodilution RVEF measurements are independent of thermistor position in the pulmonary artery.
    • Significant reductions in RVEF measurements occur when the injectate port is too far from the tricuspid valve.