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Related Experiment Videos

Diastolic flow pattern in the normal left ventricle.

O Rodevand1, R Bjornerheim, T Edvardsen

  • 1Medical Department B, Section of Cardiology, the National Hospital-Rikshospitalet, University of Oslo, Norway.

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|June 9, 1999
PubMed
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Normal left ventricle diastolic filling begins with fluid motion towards the apex, followed by vortex formation. This vortex explains retrograde flow in the outflow tract during diastasis.

Area of Science:

  • Cardiovascular physiology
  • Echocardiography
  • Hemodynamics

Background:

  • Basally directed (retrograde) velocities are observed in the left ventricular outflow tract during filling.
  • These velocities may result from apical blood return or basal shortcuts.

Purpose of the Study:

  • To elucidate the diastolic flow pattern within a normal left ventricle.
  • To understand the mechanisms behind retrograde velocities during ventricular filling.

Main Methods:

  • Utilized high frame-rate 2D color Doppler and color M-mode Doppler echocardiography in 18 healthy adults.
  • Measured intraventricular velocities at three levels in inflow and outflow compartments using pulsed Doppler.

Main Results:

Related Experiment Videos

  • Initially, all velocities were directed apically during early transmitral flow acceleration.
  • Retrograde velocities appeared in the outflow tract after peak inflow velocities and during diastasis.
  • Retrograde velocities were higher and occurred earlier near the anterior mitral leaflet tip compared to apical levels, indicating early vortex formation.

    • Conclusions:

    • Identified uniform diastolic flow patterns in normal left ventricles.
    • Early and late diastolic filling involve initial fluid column motion followed by vortex formation.
    • Vortex formation in the left ventricle explains the observed retrograde flow in the outflow compartment.