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Relation between left ventricular diastolic function and exercise tolerance in patients with left ventricular

J Heo, A S Iskandrian, A H Hakki

    Catheterization and Cardiovascular Diagnosis
    |January 1, 1986
    PubMed
    Summary
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    Left ventricular diastolic function, specifically exercise peak filling rate, predicts exercise tolerance in patients with left ventricular dysfunction. Patients with better exercise capacity showed a higher exercise peak filling rate.

    Area of Science:

    • Cardiology
    • Cardiovascular Physiology

    Background:

    • Resting systolic function (ejection fraction) does not correlate with exercise tolerance in patients with left ventricular dysfunction.
    • Left ventricular diastolic function is a potential determinant of exercise capacity in this population.

    Purpose of the Study:

    • To investigate the relationship between left ventricular diastolic performance and exercise tolerance.
    • To identify predictors of exercise capacity in patients with left ventricular dysfunction and coronary artery disease.

    Main Methods:

    • Sixty-three patients with left ventricular dysfunction (ejection fraction < 50%) underwent symptom-limited bicycle ergometry.
    • Left ventricular diastolic function was assessed, focusing on peak filling rate at rest and during exercise.
    • Patients were stratified into groups based on exercise tolerance: normal, mild intolerance, and severe intolerance.

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    Main Results:

    • No significant differences were observed in age, ejection fraction, or resting peak filling rate among exercise tolerance groups.
    • Exercise peak filling rate was significantly higher in patients with normal exercise tolerance compared to those with intolerance (p = 0.03).
    • Multivariate analysis identified exercise peak filling rate as the sole predictor of exercise tolerance (F = 6.0).

    Conclusions:

    • Exercise peak filling rate is a significant predictor of exercise tolerance in patients with left ventricular dysfunction.
    • Diastolic function, assessed by exercise peak filling rate, plays a crucial role in determining exercise capacity in this patient group.