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Related Experiment Videos

Reversible EOL-indicator: a new cause for low pacemaker rate.

W Scheibelhofer, J Kaliman, A Laczkovics

    Pacing and Clinical Electrophysiology : PACE
    |July 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    A pacemaker rate drop was observed due to a flip-flop state change, not battery issues. A simple magnet test resolved the issue, highlighting a potential design flaw in Medtronic pacemakers.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Medical Device Technology

    Background:

    • Pacemaker malfunction can lead to suboptimal patient care.
    • End-of-life (EOL) indicators are crucial for pacemaker longevity assessment.
    • Medtronic 5967 pacemakers utilize a 10% rate drop as an EOL indicator.

    Observation:

    • A patient's pacemaker (Medtronic 5967) exhibited a rate decrease from 70 ppm to 62.5 ppm six months post-implantation.
    • This rate drop was not attributable to battery depletion or oversensing.
    • Applying a magnet to the pacemaker temporarily restored the normal rate.

    Findings:

    • The observed rate decrease was likely caused by a flip-flop circuit state change.
    • This state change, a potential EOL indicator, may be triggered by transient power supply voltage drops during shipping or implantation.

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  • The phenomenon is fully reversible with a magnet test.

    • Implications:

    • Transient voltage fluctuations can mimic pacemaker EOL indicators, potentially leading to unnecessary device replacement.
    • Future pacemaker designs should incorporate resilience against short voltage drops.
    • Routine post-implantation magnet testing is recommended to preemptively identify and resolve such reversible rate changes.