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Exercise-induced distal atrioventricular block.

A K Woelfel, R J Simpson, L S Gettes

    Journal of the American College of Cardiology
    |September 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Exercise can trigger high-grade atrioventricular (AV) block in some individuals. This block originates in the His-Purkinje system, not the AV node, suggesting a need for pacing consideration.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Internal Medicine

    Background:

    • Atrioventricular (AV) conduction normally maintains a 1:1 ratio at rest.
    • Treadmill exercise testing is used to assess cardiac function under stress.

    Observation:

    • Three patients exhibited 1:1 AV conduction at rest.
    • During exercise, these patients developed fixed 2:1 or 3:1 AV block.

    Findings:

    • Electrophysiologic studies revealed AV block distal to the AV node.
    • Exercise-induced block was attributed to increased atrial rate and His-Purkinje system abnormalities.

    Implications:

    • Exercise-induced high-grade AV block indicates His-Purkinje conduction disease, not solely AV nodal disease.

    Related Experiment Videos

  • Patients presenting with these symptoms may benefit from permanent cardiac pacing.