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Selective versus non-selective His bundle pacing.

D O Williams, B J Scherlag, R R Hope

    Cardiovascular Research
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    Achieving selective His bundle pacing requires careful consideration of electrode placement and pacing stimulus parameters. Variations in these factors can lead to non-selective pacing, impacting cardiac electrophysiology.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Pacing

    Background:

    • His bundle pacing offers a more physiological alternative to ventricular pacing.
    • Understanding the nuances of His bundle stimulation is crucial for optimizing pacing strategies.

    Purpose of the Study:

    • To investigate the different types of cardiac responses during His bundle pacing in dogs.
    • To identify factors influencing selective versus non-selective His bundle pacing.

    Main Methods:

    • Stimulation via bipolar electrode catheters in anesthetized open-chest dogs.
    • Recordings from the right atrium, ventricular septum, and ventricular epicardium.
    • Analysis of six distinct pacing response patterns during A-V junctional stimulation.

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    Main Results:

    • Six response types observed, including low atrial, His bundle, and combined pacing modes.
    • Non-selective pacing (His bundle with atrium/septum) identified by QRS and T-wave changes on surface leads.
    • Electrode position and pacing stimulus parameters (polarity, intensity, duration) significantly influenced pacing outcomes.

    Conclusions:

    • Selective His bundle pacing requires precise control over electrode positioning and stimulus characteristics.
    • Non-selective His bundle pacing can be detected via surface ECG.
    • Failure to optimize these factors may prevent achievement of selective His bundle pacing.