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Idiopathic restrictive cardiomyopathy.

R J Siegel, P K Shah, M C Fishbein

    Circulation
    |August 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Restrictive cardiomyopathy can occur without specific causes, presenting with heart failure symptoms and atrial enlargement. This condition may have a prolonged course but often shows poor response to standard treatments.

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    Area of Science:

    • Cardiology
    • Pathology

    Background:

    • Restrictive cardiomyopathy is characterized by impaired ventricular filling.
    • Idiopathic forms are less understood, particularly regarding morphology and clinical course.

    Purpose of the Study:

    • To detail the clinical, hemodynamic, and morphologic findings in four patients with primary restrictive cardiomyopathy.
    • To investigate potential causes and clinical characteristics in the absence of specific infiltrative disorders.

    Main Methods:

    • Clinical data collection including symptoms, pacemakers, and chest x-rays.
    • Echocardiographic and hemodynamic assessments (pressure tracings).
    • Necropsy and histopathologic evaluation (light and electron microscopy).

    Main Results:

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    • All patients presented with congestive heart failure, atrial enlargement, and normal left ventricular systolic function.
    • Hemodynamics showed elevated filling pressures and a dip and plateau pattern in some.
    • Pathology revealed biatrial dilatation, atrial thrombi, and interstitial fibrosis without specific infiltrative causes.

    Conclusions:

    • A restrictive hemodynamic profile can exist without specific infiltrative myocardial disorders.
    • Patients may have a prolonged course but often show poor response to medical or surgical interventions.
    • Interstitial fibrosis is a key finding in these idiopathic cases.