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Related Experiment Videos

Characterization of chronically implanted ventricular endocardial pacing leads.

D A Angello, J H McAnulty, J Dobbs

    American Heart Journal
    |June 1, 1984
    PubMed
    Summary

    Pacemaker lead integrity is crucial as generator life extends. This study analyzed chronic lead data, revealing thresholds and impedances that guide long-term pacemaker assessments.

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    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Medical Device Technology

    Background:

    • Advancements in lithium power sources have increased pacemaker generator longevity.
    • This shift makes the pacing lead the limiting factor for overall pacemaker implant lifespan.
    • Accurate assessment of chronically implanted pacing lead integrity is therefore essential.

    Purpose of the Study:

    • To retrospectively analyze chronic threshold and impedance data from ventricular endocardial leads.
    • To establish general guidelines for chronic pacing lead parameters based on long-term data.
    • To highlight challenges in collecting and interpreting long-term pacing lead performance data.

    Main Methods:

    • Retrospective analysis of chronic threshold and impedance data.

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  • Inclusion of 61 patients with the same type of ventricular endocardial lead.
  • Data collection spanned up to 10 years of chronic implantation.

    • Main Results:

    • Mean acute current threshold was 0.81 +/- 0.33 mA.
    • Chronic current thresholds ranged from 1 to 5 mA, 2-5 times the acute implant value.
    • Chronic voltage thresholds ranged from 0.7 to 4 V, and impedance from 335 to 775 omega.

    Conclusions:

    • The study provides general guidelines for interpreting chronic pacing lead parameters.
    • Findings underscore the significant increase in chronic thresholds compared to acute values.
    • Interpreting long-term lead data presents notable difficulties that require careful consideration.