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Systolic ejection murmurs in the era of modern cardiology: what do we really know?

J P Murgo

    Journal of the American College of Cardiology
    |November 20, 1998
    PubMed

    Insights

    This study reviews pulsatile ejection dynamics, linking ventricular pressures, flow velocities, and heart sounds. It explores turbulent flow and its role in murmur generation, presenting new evidence for increased intraventricular velocities causing systolic murmurs.

    Area of Science:

    • Cardiovascular Physiology
    • Hemodynamics
    • Biomedical Engineering

    Background:

    • Reviews fundamental principles of pulsatile ejection dynamics.
    • Examines turbulent flow using the Reynolds number concept.
    • Establishes links between cardiovascular pressures, flow velocities, and sound generation.

    Discussion:

    • Presents evidence for cause-and-effect relationships between turbulent flow and heart murmur generation.
    • Compares hemodynamic and phonocardiographic data from normal subjects with patients suffering from aortic stenosis and hypertrophic cardiomyopathy.
    • Analyzes a novel study on increased intraventricular velocities as a potential cause of adult systolic murmurs.

    Key Insights:

    • Turbulent flow, quantified by the Reynolds number, is a key factor in heart murmur genesis.
    • Abnormalities in left ventricular and aortic pressures and flow velocities significantly impact cardiovascular sound.
    • Increased intraventricular velocities are identified as a potential new cause for systolic murmurs in adults.

    Outlook:

    • Further research into the precise mechanisms linking intraventricular velocities and murmur generation.
    • Potential for improved diagnostic tools for valvular heart disease and cardiomyopathies.
    • Integration of hemodynamic principles into clinical assessment of cardiovascular sound.

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