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Related Experiment Videos

Effect of ventricular function on left ventricular ejection time in aortic stenosis.

P Kligfield, P Okin

    British Heart Journal
    |October 1, 1979
    PubMed
    Summary
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    In aortic stenosis, ejection time prolongs with obstruction in patients with normal heart function. However, in heart failure, ejection time is less prolonged and unrelated to valve area, suggesting complex factors influence duration.

    Area of Science:

    • Cardiology
    • Cardiac Physiology

    Background:

    • Aortic stenosis (AS) is a critical condition affecting cardiac function.
    • Understanding factors influencing ejection time in AS is clinically significant.

    Purpose of the Study:

    • To investigate the relationship between rate-corrected left ventricular ejection time (LVET) and aortic valve area (AVA) in patients with AS.
    • To explore how ventricular performance determinants affect LVET in AS.

    Main Methods:

    • Study included 54 catheterized patients diagnosed with aortic stenosis.
    • Analyzed correlations between LVET, AVA, and various hemodynamic parameters.

    Main Results:

    • In patients with normal cardiac index, LVET showed a linear increase with greater obstruction (smaller AVA).

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  • In patients with ventricular failure, LVET was less prolonged and did not correlate with AVA.
  • Other hemodynamic factors (cardiac output, stroke volume, heart rate, pressure gradients) did not fully explain the variability in LVET.

    • Conclusions:

    • Ventricular function status significantly modifies the relationship between LVET and aortic stenosis severity.
    • The wide range of ejection times in severe aortic stenosis likely results from multiple interacting factors beyond valve area.