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A clinical study of left ventricular relaxation

Y Hirota

    Circulation
    |October 1, 1980
    PubMed

    Insights

    Left ventricular relaxation is impaired in various heart conditions, including hypertrophic cardiomyopathy and mitral stenosis. This abnormality may be an early sign of left ventricular mechanical dysfunction.

    Area of Science:

    • Cardiology
    • Cardiovascular Physiology

    Background:

    • Left ventricular (LV) relaxation is crucial for diastolic function.
    • Abnormalities in LV relaxation are observed in numerous cardiac diseases.

    Purpose of the Study:

    • To investigate and quantify left ventricular (LV) relaxation using time constant T and peak negative dP/dt in patients with various cardiomyopathies and valvular heart diseases.
    • To determine if LV relaxation abnormalities are an early indicator of mechanical dysfunction.

    Main Methods:

    • Studied LV relaxation in patients with hypertrophic cardiomyopathy (HCM), congestive cardiomyopathy (CCM), hypertensive heart disease (HHD), coronary artery disease (CAD) with/without asynergy, mitral stenosis (MS), and mitral regurgitation (MR).
    • Utilized time constant T and peak negative dP/dt as primary indices of LV relaxation.
    • Included 18 normal subjects as controls.

    Main Results:

    • The time constant T was significantly prolonged in HCM, CCM, CAD (with and without asynergy), and MS compared to normal controls.
    • Peak negative dP/dt was significantly reduced in HCM, CCM, CAD with asynergy, MS, and MR.
    • Prolongation of the time constant T was also observed in elderly normal subjects, suggesting aging contributes to impaired relaxation.

    Conclusions:

    • LV relaxation abnormalities are prevalent across a spectrum of cardiac conditions, including cardiomyopathies and valvular diseases.
    • The exact causes of LV relaxation impairment appear multifactorial.
    • LV relaxation abnormality may represent one of the earliest signs of mechanical dysfunction in the human left ventricle.

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