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AV node dysfunction in the mitral valve prolapse syndrome.

A J Greenspon, S F Schaal

    Pacing and Clinical Electrophysiology : PACE
    |September 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Mitral valve prolapse can cause bradyarrhythmias, leading to syncope. Electrophysiology studies reveal significant AV node and conduction system abnormalities in symptomatic patients.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Arrhythmias

    Background:

    • Mitral valve prolapse syndrome is linked to various arrhythmias.
    • Some patients experience bradyarrhythmias, causing symptoms like lightheadedness and syncope.

    Purpose of the Study:

    • To investigate the clinical and electrophysiologic features of symptomatic mitral valve prolapse patients with atrioventricular (AV) node dysfunction.

    Main Methods:

    • Clinical evaluation and electrophysiology studies were performed on seven patients.
    • Key electrophysiologic parameters assessed included AH interval and response to atrial pacing.

    Main Results:

    • Six of seven patients showed prolonged AH intervals or abnormal responses to atrial pacing.

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  • Many patients exhibited sinus node dysfunction and distal His-Purkinje conduction abnormalities alongside AV node dysfunction.

    • Conclusions:

    • Atrioventricular node dysfunction in symptomatic mitral valve prolapse may stem from autonomic dysfunction or diffuse conduction system disease.