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Related Experiment Videos

A midsystolic ejection click

W D Towne, R Patel, J B Cruz

    Chest
    |February 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    This study clarifies that a midsystolic click in a patient with heart failure was not due to mitral valve prolapse. The click originated from delayed aortic valve opening caused by left ventricular dysfunction.

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    Area of Science:

    • Cardiology
    • Cardiac Physiology

    Background:

    • A patient presented with symptoms including left ventricular failure, aortic regurgitation, and rate-related left bundle-branch block.
    • Initial assessment suggested mitral valve prolapse due to a midsystolic click and echocardiographic findings.

    Observation:

    • The midsystolic click's timing did not change with head-up tilt or atrial pacing, which is atypical for mitral valve prolapse.
    • Cardiac catheterization revealed severe left ventricular dysfunction disproportionate to the aortic regurgitation.

    Findings:

    • Intracardiac phonocardiography and catheter-tip manometry identified the click as aortic in origin.
    • The click was determined to be midsystolic due to delayed aortic valve opening, linked to left ventricular dysfunction and conduction delays, not mitral valve prolapse.

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    Implications:

    • This case highlights the importance of differentiating the origin of midsystolic clicks.
    • Left ventricular dysfunction can alter the timing of aortic valve opening, mimicking other cardiac conditions.