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Rate-responsive pacing: clinical experience.

A Goicolea de Oro, M W Ayza, R de la Llana

    Pacing and Clinical Electrophysiology : PACE
    |May 1, 1985
    PubMed
    Summary
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    Rate-responsive pacemakers significantly improve exercise tolerance in patients with cardiac pacing needs. Both RS4 and TX systems demonstrated enhanced physical capacity compared to standard pacing, indicating their effectiveness.

    Area of Science:

    • Cardiology
    • Biomedical Engineering

    Background:

    • Rate-responsive pacing is an evolving cardiac pacing modality.
    • Dual chamber rate-responsive pacing may become optimal for most pacemaker patients.

    Purpose of the Study:

    • To evaluate the clinical experience with two single-lead rate-responsive pacemakers: RS4 and TX.
    • To compare their short- and long-term efficacy in improving patient exercise tolerance.

    Main Methods:

    • Nine patients received RS4 and 10 received TX pacemakers.
    • Exercise tolerance was assessed using treadmill tests in VVI and rate-responsive modes.
    • Follow-up included 24-hour Holter monitoring and treadmill tests.

    Main Results:

    • Rate-responsive pacing significantly improved exercise tolerance (9.0 METs) compared to VVI pacing (6.6 METs).

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  • Both RS4 and TX groups showed similar improvements, despite higher pacing rates in the TX group.
  • One patient with an RS4 experienced pacemaker-mediated tachycardia.

    • Conclusions:

    • Single-lead rate-responsive pacemakers enhance patient exercise capacity.
    • Both RS4 and TX systems offer effective rate-responsive pacing solutions.
    • Further investigation into pacemaker-mediated tachycardia is warranted.