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Related Experiment Videos

Clinical experience with a programmable pacemaker.

K Venkataraman, M Bilitch

    Pacing and Clinical Electrophysiology : PACE
    |September 1, 1980
    PubMed
    Summary
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    This study evaluated a new pacemaker, finding three failures due to a timing crystal issue, which has since been fixed. For chronic pacing, consider 0.2 ms pulse width or greater for optimal patient outcomes.

    Area of Science:

    • Cardiology
    • Biomedical Engineering

    Background:

    • Evaluation of new programmable pacemakers is crucial for improving cardiac rhythm management.
    • Lithium-powered R-wave inhibited unipolar pulse generators represent advancements in pacemaker technology.

    Purpose of the Study:

    • To assess the safety and efficacy of a new programmable pacemaker (CPI Model 0505).
    • To identify potential failure modes and determine optimal programming parameters for chronic pacing.

    Main Methods:

    • A total of 15 patients received the new pacemaker, divided into initial implants (n=5) and replacements (n=10).
    • Follow-up ranged from 1 to 18 months, with pacemaker output and programming parameters monitored.
    • Pacemaker failures were investigated to identify the root cause.

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    Main Results:

    • Three instances of pacemaker failure occurred, linked to a 10 kHz timing crystal malfunction.
    • This specific malfunction has been rectified in subsequent devices.
    • No complications were observed in patients programmed at a 0.1 ms pulse width, but 0.2 ms or greater may be advisable for chronic pacing.

    Conclusions:

    • The evaluated pacemaker demonstrated a correctable technical issue with its timing crystal.
    • Programming pulse width at 0.2 ms or higher is suggested for chronic pacing in patients with specific threshold requirements.
    • Further long-term studies are warranted to fully establish the device's chronic performance.