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Related Experiment Videos

[Clinical experiences with 3 different rate-adaptive pacemaker systems].

B Maisch, H Langenfeld, H Steilner

    Zeitschrift Fur Kardiologie
    |August 1, 1986
    PubMed
    Summary
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    Rate responsive pacemakers adapt heart rate to physical activity. The Biorate pacemaker offers reliable function, while QT (Tx) pacemakers show adaptation failures, and Activitrax pacemakers depend on specific muscle activity.

    Area of Science:

    • Cardiology
    • Biomedical Engineering

    Background:

    • Physiological stimulation in pacemakers can be achieved through bifocal or rate-responsive pacing.
    • Rate-responsive pacemakers adjust heart rate based on biological signals during physical activity.

    Purpose of the Study:

    • To evaluate the performance of three available rate-responsive pacemaker systems: QT (Tx/Quintech), Biorate, and Activitrax.
    • To compare clinical experiences and survey data on the efficacy and limitations of these pacemakers.

    Main Methods:

    • Clinical experience with 8 QT, 6 Biorate, and 8 Activitrax pacemakers.
    • Survey of 95 QT and 37 Biorate pacemakers across 11 centers.
    • Analysis of pacemaker function, frequency adaptation, and failure modes.

    Main Results:

    Related Experiment Videos

    • The Biorate pacemaker demonstrated problem-free function, with limited programmability as its main drawback.
    • The QT (Tx) pacemaker exhibited a 26% failure rate in frequency adaptation, primarily due to electrode tip voltage polarization in early models.
    • The Activitrax pacemaker provided satisfactory frequency adaptation, contingent on shoulder and pectoral muscle activity.

    Conclusions:

    • Biorate pacemakers are reliable but require improved programmability.
    • QT (Tx) pacemakers have shown significant issues with frequency adaptation, necessitating design improvements.
    • Activitrax pacemakers offer functional rate adaptation but are dependent on specific patient physical activity patterns.