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Related Experiment Videos

Effects of hypertrophy on contractile function in man.

H P Krayenbuehl

    Basic Research in Cardiology
    |March 1, 1977
    PubMed
    Summary

    Chronic pressure and volume overload depress left ventricular contractile function. Aortic valve replacement improves ventricular muscle mass and contractile function in patients with aortic stenosis.

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    Area of Science:

    • Cardiology
    • Cardiovascular Physiology

    Background:

    • Chronic pressure and volume overload conditions, such as aortic stenosis, lead to left ventricular hypertrophy.
    • Contractile function is often depressed in these conditions despite increased muscle mass.

    Purpose of the Study:

    • To compare the effects of pressure and volume overload on left ventricular contractile function.
    • To evaluate the impact of aortic valve replacement on ventricular mass and function.

    Main Methods:

    • Assessment of contractile function using isovolumic and ejection phase indexes.
    • Measurement of left ventricular muscle mass.
    • Evaluation of changes following aortic valve replacement.

    Main Results:

    • Contractile function is depressed to a similar extent in pressure and volume overload with matched left ventricular muscle mass.
    • Pressure overload hypertrophy in aortic stenosis is linked to reduced inotropic state.
    • Aortic valve replacement significantly reduces ventricular muscle mass and improves contractile function.

    Conclusions:

    • Hypertrophy can maintain ejection fraction despite diminished contractility if afterload is not excessive.
    • Aortic valve replacement is effective in reversing detrimental changes in ventricular mass and function.

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