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Related Experiment Videos

[Gap phenomenon and supranormal conduction during intermittent left bundle-branch block]

C Barnay, J L Medvedowsky, P Nicolai

    Archives Des Maladies Du Coeur Et Des Vaisseaux
    |July 1, 1976
    PubMed
    Summary

    Researchers studied intermittent bundle branch block using electrophysiological methods. Two distinct mechanisms were identified: one unrelated to heart rate, and another linked to tachycardia and supranormal conduction.

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    Area of Science:

    • Cardiology
    • Electrophysiology

    Background:

    • Intermittent bundle branch block (IBBB) mechanisms, particularly left bundle branch block (LBBB), require further elucidation.
    • Understanding IBBB is crucial for diagnosing and managing cardiac conduction abnormalities.

    Observation:

    • Three cases of intermittent left bundle branch block were investigated using intracavitary electrodes to measure the bundle of His potential.
    • The extrastimulus method was employed to study conduction properties and refractory periods.

    Findings:

    • Case 1 (rate-independent LBBB) demonstrated a Type 1 'Gap' phenomenon of nodal origin, with dual zones where extrastimuli overcame the block.
    • Case 2 & 3 (rate-dependent LBBB) showed 'recovery' associated with 'supranormal' conduction, with 'Gap' and 'supranormality' acting successively in Case 3.

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  • Two types of intermittent LBBB were distinguished: rate-independent (prolonged refractory period) and rate-dependent (increased refractory period and supranormal conduction).

    • Implications:

    • This study differentiates between rate-independent and rate-dependent intermittent LBBB based on distinct electrophysiological mechanisms.
    • Findings contribute to a deeper understanding of cardiac conduction abnormalities and may inform clinical management strategies.
    • The identification of 'Gap' phenomena and 'supranormal' conduction provides insights into the complex behavior of the cardiac conduction system.