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Related Experiment Videos

Activation sequence and potential distribution maps demonstrating multicentric atrial impulse origin in dogs.

J P Boineau, C B Miller, R B Schuessler

    Circulation Research
    |March 1, 1984
    PubMed
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    This study reveals that atrial excitation originates from multiple sites, not just the sinus node, forming a dispersed pacemaker system. These findings challenge the traditional view of a single origin for heart rhythm.

    Area of Science:

    • Cardiovascular Physiology
    • Cardiac Electrophysiology
    • Atrial Excitation Mechanisms

    Background:

    • The traditional understanding of atrial excitation posits a single origin from the sinus node.
    • Previous studies have not fully elucidated the spatial distribution and dynamics of impulse initiation in the atria.

    Purpose of the Study:

    • To investigate the precise sites and patterns of atrial epicardial excitation onset.
    • To determine if atrial impulse origin is exclusively unifocal or involves multiple sites.
    • To explore the functional implications of multiple impulse origins on atrial activation and heart rate regulation.

    Main Methods:

    • Recording unipolar electrograms from 360 electrodes on the canine superior vena cava and right atrium.
    • Generating high-resolution activation sequence and potential distribution maps during early atrial depolarization.

    Related Experiment Videos

  • Employing physiological and pharmacological interventions to modulate autonomic input to the atria.

    • Main Results:

    • Activation maps showed impulse origin from multiple, widely separated sites, generating 2-3 wavefronts that merged.
    • Potential maps revealed multiple sites of primary negativity, correlating with impulse origins.
    • Autonomic interventions and sinus arrhythmia induced changes in impulse origin patterns, affecting heart rate.
    • Data supported a widely distributed system of coordinated atrial pacemakers, including sites beyond the sinus node.

    Conclusions:

    • Atrial excitation arises from a distributed network of pacemakers, not solely the sinus node.
    • This dispersed system exhibits functional differentiation and coordination, influencing atrial activation.
    • The findings necessitate a revised understanding of atrial electrophysiology and pacemaker function.