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Regional cardiac tamponade: a hemodynamic study.

N O Fowler, M Gabel

    Journal of the American College of Cardiology
    |July 1, 1987
    PubMed
    Summary
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    PRIMARY MYOCARDIAL DISEASE (HEART MUSCLE DISEASE, CARDIOMYOPATHY).

    A listing of research in the cardiovascular field·2014

    Cardiac tamponade significantly reduces cardiac output. Combined atrioventricular (AV) tamponade causes more severe hemodynamic effects than isolated atrial or ventricular tamponade, highlighting the impact of comprehensive heart compression.

    Area of Science:

    • Cardiovascular Physiology
    • Cardiac Tamponade Pathophysiology

    Background:

    • Cardiac tamponade, the abnormal accumulation of fluid within the pericardial space, can severely impair cardiac function.
    • Understanding the distinct and combined effects of atrial and ventricular compression is crucial for diagnosing and managing this condition.

    Purpose of the Study:

    • To investigate the hemodynamic consequences of isolated atrial, isolated ventricular, and combined atrioventricular (AV) tamponade in a canine model.
    • To compare the severity of cardiac output reduction and pressure changes under different tamponade conditions.

    Main Methods:

    • Cardiac tamponade was induced in 10 dogs by increasing intrapericardial pressure to 10, 15, and 20 mm Hg.
    • Specific conditions included atrial tamponade, ventricular tamponade, and combined AV tamponade.

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  • Hemodynamic parameters such as cardiac output, mean aortic pressure, and atrial pressures were measured.

    • Main Results:

    • All levels of cardiac tamponade significantly decreased cardiac output.
    • Atrial and ventricular tamponade produced comparable reductions in cardiac output and mean aortic pressure.
    • Combined AV tamponade resulted in significantly greater increases in atrial pressures and decreases in cardiac output compared to isolated tamponade.
    • A pressure gradient between vena cavae and right atrium was observed during isolated atrial tamponade, indicating venous compression.

    Conclusions:

    • Compression of both ventricles has a more profound hemodynamic impact than compression of a single ventricle.
    • Overall cardiac tamponade, encompassing both atria and ventricles, exerts the most significant hemodynamic compromise.
    • Compression of great veins can contribute to tamponade effects, particularly when ventricular filling is unimpeded.