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Related Experiment Videos

Clinical experience with a new rate-responsive TX pacemaker.

M Yasuno, Y Nishino, M Nishino

    Angiology
    |December 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    This study introduces a new rate-responsive pacemaker using the QT interval to adjust heart rate. The TX mode demonstrated superior exercise capacity and heart rate response compared to the VVI mode in patients.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Medical Devices

    Background:

    • Pacemakers are crucial for managing bradycardia.
    • Current rate-responsive pacemakers have limitations in accurately reflecting metabolic demand.
    • The QT interval offers a potential marker for physiological metabolic status.

    Purpose of the Study:

    • To evaluate the initial clinical experience with a novel rate-responsive pacemaker (TX pacemaker).
    • To assess the efficacy of the TX pacemaker in enhancing heart rate response and exercise capacity.
    • To compare the performance of the TX mode with the conventional VVI mode.

    Main Methods:

    • Initial implantation and follow-up of 10 patients with the TX pacemaker.
    • Utilized a transvenous ventricular electrode sensing the QT interval for metabolic demand indication.

    Related Experiment Videos

  • Performed bicycle ergometer tests comparing TX mode with VVI mode.
  • Measured cardiac index using thermodilution in one patient during exercise.

    • Main Results:

    • The TX pacemaker uses QT interval sensing for physiological rate-responsive pacing.
    • TX mode significantly improved maximal heart rate (115 bpm vs 96 bpm) and exercise time (10.7 min vs 8.0 min) compared to VVI mode (p<0.01).
    • Cardiac index increased adequately with pacing rate during exercise in one patient (3.38 to 7.34 L/min/m²).

    Conclusions:

    • The TX pacemaker provides physiological rate-responsive pacing by utilizing the QT interval.
    • This technology offers a simple method to increase heart rate and cardiac index during exertion.
    • Initial results suggest the TX pacemaker enhances exercise ability in patients.