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Related Experiment Videos

Acute and chronic pulse-width thresholds in solid versus porous tip electrodes.

K Breivik, O J Ohm, H Engedal

    Pacing and Clinical Electrophysiology : PACE
    |September 1, 1982
    PubMed
    Summary
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    This study on programmable pacemakers found that while pulse-width programming conserves battery, setting it too narrow risks pacemaker failure. Ball tip electrodes showed the best long-term results for myocardial pulse-width thresholds.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Electrophysiology

    Background:

    • Programmable pacemakers offer adjustable settings for optimal patient care.
    • Myocardial pulse-width threshold is a critical parameter for pacemaker function and longevity.
    • Electrode design can influence stimulation thresholds and long-term performance.

    Purpose of the Study:

    • To evaluate myocardial pulse-width thresholds in patients with programmable pacemakers.
    • To compare the acute and chronic performance of different pacemaker electrode types.
    • To assess the utility of pulse-width programming for battery conservation.

    Main Methods:

    • Non-invasive measurement of myocardial pulse-width thresholds in 61 patients.
    • Follow-up for a mean of 18 months post-implantation.

    Related Experiment Videos

  • Comparison of various pacemaker models and electrode configurations (ball tip, ring tip, porous tip).

    • Main Results:

    • Ball tip and porous tip electrodes showed lower acute stimulation thresholds compared to larger electrodes.
    • No significant chronic differences in thresholds were observed between electrode types.
    • Ball tip electrodes trended towards better long-term results, while porous tip electrodes performed poorest.
    • 62.3% of patients achieved chronic thresholds ≤0.1 ms, indicating effective battery conservation through programming.
    • 9.8% of patients experienced thresholds ≥0.5 ms at some point, highlighting risks of overly narrow pulse widths.

    Conclusions:

    • Pulse-width programming is effective for conserving pacemaker battery energy.
    • Electrode type influences acute thresholds, with ball tip electrodes showing favorable long-term performance.
    • Caution is advised against setting pulse width too narrow in standard non-programmable pacemakers due to potential failure.