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Related Experiment Videos

Thermodilution right ventricular ejection fraction. Catheter positioning effects.

F G Spinale1, J L Zellner, R Mukherjee

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

Chest
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

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Estimating right ventricular (RV) ejection fraction using thermodilution is feasible. Optimal RV thermodilution measurements depend critically on precise catheter positioning, particularly the thermistor

Area of Science:

  • Cardiovascular Physiology
  • Medical Device Technology
  • Diagnostic Imaging

Background:

  • Accurate estimation of right ventricular (RV) ejection fraction (RVEF) is clinically challenging.
  • Thermodilution techniques offer a potential method for RVEF calculation.
  • The reliability of thermodilution for RVEF depends on optimal thermal mixing and sensor placement.

Purpose of the Study:

  • To investigate the impact of thermodilution catheter positioning on RVEF measurements.
  • To determine the influence of thermistor distance from the pulmonic valve and injectate port distance from the tricuspid valve on RVEF accuracy.
  • To assess these effects under both normal and tachycardia heart rates.

Main Methods:

  • Utilized a thermodilution catheter in the pulmonary artery and an injectate catheter in the right atrium in ten pigs.

Related Experiment Videos

  • Measured RVEF with varying distances between the pulmonic valve and thermistor.
  • Measured RVEF with varying distances between the tricuspid valve and injectate port, at paced heart rates of 107 bpm and 140 bpm.

    • Main Results:

    • Optimal RVEF and lowest variation were achieved with the thermistor 2 cm from the pulmonic valve.
    • Increased distance between the pulmonic valve and thermistor significantly reduced RVEF, especially during tachycardia.
    • Injectate port position had minimal effect at lower heart rates but significantly impacted RVEF during tachycardia when 7 cm from the tricuspid valve.

    Conclusions:

    • Thermodilution can reliably measure RVEF when catheter position is optimized.
    • Minimizing the distance between the thermistor and pulmonic valve is crucial for accurate RVEF.
    • Optimal placement of the injectate port in the right atrium is also important, particularly during elevated heart rates.