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Related Experiment Videos

Pacing threshold interval with decreasing and increasing output.

J C Sylvén, M Hellerstedt, M Levander-Lindgren

    Pacing and Clinical Electrophysiology : PACE
    |September 1, 1982
    PubMed
    Summary
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    This study on pacemaker electrodes found a consistent threshold interval regardless of implantation status or patient condition. This interval, representing the difference in pacing output, remained stable, indicating reliable pacemaker function.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Electrophysiology

    Background:

    • Pacemaker implantation and pulse generator replacement are common procedures for bradycardia.
    • Accurate pacing threshold determination is crucial for optimal pacemaker function and longevity.
    • Understanding factors influencing pacing thresholds is essential for device management.

    Purpose of the Study:

    • To investigate the pacing threshold interval in patients undergoing pacemaker implantation or replacement.
    • To determine if factors like electrode status or pacemaker indication affect the pacing threshold interval.
    • To assess the consistency of pacing threshold measurements.

    Main Methods:

    • The study involved 44 patients: 23 with new endocardial electrodes and 21 during pulse-generator replacement.

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  • Pacing thresholds were measured using both decreasing and increasing output methods.
  • Threshold intervals were calculated and analyzed in relation to implantation status, pacemaker indication, and spontaneous activity.

    • Main Results:

    • Pacing thresholds differed significantly between new implants (0.6V/0.7mA) and pulse generator replacements (2.0V/2.0mA) when determined with decreasing output.
    • The pacing threshold interval (difference between increasing and decreasing output measurements) averaged 0.20V/0.20mA, with a maximum of 0.70V/0.55mA.
    • This threshold interval was consistent across different pacemaker indications, spontaneous activity levels, and electrode implantation status.

    Conclusions:

    • A stable pacing threshold interval exists, independent of electrode status or patient-specific factors.
    • This finding suggests predictable behavior in pacing threshold measurements, aiding in pacemaker management.
    • No instances of pacemaker-induced Mobitz type I block with Wenckebach periodicity were observed.