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Related Experiment Videos

Initial ventricular activation in left-sided intraventricular conduction defects

D S Cannom, M G Wyman, B N Goldreyer

    Circulation
    |September 1, 1980
    PubMed
    Summary
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    This study investigated rate-related left bundle branch block (LBBB) in nine patients. Findings reveal distinct ventricular activation patterns in complete and incomplete LBBB, differing significantly from normal conduction.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Diagnostics

    Background:

    • Rate-related left bundle branch block (LBBB) is a recognized clinical entity.
    • Understanding ventricular activation patterns during LBBB is crucial for diagnosis and management.

    Purpose of the Study:

    • To define ventricular septal activation patterns in normal conduction, complete LBBB, and incomplete LBBB.
    • To differentiate conduction characteristics between patients developing LBBB.

    Main Methods:

    • Studied nine patients with ECG-confirmed rate-related LBBB.
    • Utilized His bundle electrograms, right ventricular (RV) apex electrograms, and vectorcardiograms.
    • Increased heart rate to induce LBBB and recorded electrophysiological data.

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    Main Results:

    • Five patients (Group 1) showed reversed septal activation and increased HV intervals (10-30 msec) upon LBBB onset; H-RVA interval remained unchanged.
    • Four patients (Group 2) had normal QRS duration but reversed septal activation; HV and H-RVA intervals did not change, only QRS widened.
    • Both LBBB groups exhibited conduction patterns markedly different from normal conduction.

    Conclusions:

    • Defined distinct ventricular septal activation pathways for complete (Group 1) and incomplete (Group 2) LBBB.
    • Identified key electrophysiological differences between LBBB subtypes and normal conduction.
    • These findings aid in understanding and diagnosing LBBB variations.