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Related Experiment Videos

Rate-responsive pacing in patients with left ventricular failure.

R Paolo, P M Domenica, O Eraldo

    Advances in Cardiology
    |January 1, 1986
    PubMed
    Summary

    Rate-responsive pacing significantly improves aerobic and hemodynamic performance in patients with AV block. Benefits are most pronounced in those with left ventricle dysfunction, enhancing exercise capacity and VO2 max.

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    Area of Science:

    • Cardiology
    • Exercise Physiology
    • Biomedical Engineering

    Background:

    • Atrial synchronous ventricular pacing and respiratory-dependent ventricular pacing are used in patients with atrioventricular block.
    • Understanding the impact of different pacing modes on cardiovascular performance is crucial for patient management.

    Purpose of the Study:

    • To compare the effects of rate-responsive pacing versus fixed ventricular pacing on aerobic and hemodynamic performance in patients with chronic AV block.
    • To evaluate the benefits of respiratory-dependent ventricular pacing in patients with AV block and left ventricle dysfunction.

    Main Methods:

    • Assessed aerobic and hemodynamic performance at rest and during exercise.
    • Compared outcomes between rate-responsive pacing, fixed ventricular pacing, and respiratory-dependent ventricular pacing.

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  • Analyzed parameters including cardiac output, VO2 max, anaerobic threshold, and physical work capacity.

    • Main Results:

    • Rate-responsive pacing significantly increased cardiac output, VO2 max, and work tolerance in patients with AV block and normal left ventricles compared to fixed pacing.
    • Respiratory-dependent ventricular pacing improved maximal cardiac output, VO2 anaerobic threshold, and physical work capacity in patients with AV block and left ventricle dysfunction.
    • The positive impact of rate-responsive pacing was more substantial in patients with left ventricle dysfunction than in those with normal left ventricle function.

    Conclusions:

    • Rate-responsive pacing offers significant advantages for aerobic and hemodynamic performance in patients with chronic AV block.
    • Patients with left ventricle dysfunction experience the greatest benefits from rate-responsive pacing, improving exercise capacity.
    • Pacing mode selection should consider individual patient cardiac function, particularly left ventricle status.