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Related Experiment Videos

Do cardiac aneurysms blow out?

D K Bogen, T A McMahon

    Biophysical Journal
    |August 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Cardiac aneurysms may form from elastically unstable infarcted ventricular walls. However, models show passive myocardial tissue, unlike rubber-like materials, would not rupture or form aneurysms.

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    Area of Science:

    • Cardiovascular Science
    • Biomechanical Engineering
    • Medical Physics

    Background:

    • Cardiac aneurysms are pathological cardiac dilatations.
    • Ventricular wall rupture can occur following myocardial infarction.
    • The biomechanical mechanisms leading to aneurysm formation are not fully understood.

    Purpose of the Study:

    • To investigate the biomechanical hypothesis that cardiac aneurysms result from elastic instability of infarcted ventricular walls.
    • To model the behavior of myocardial tissue under stress and strain, considering both passive and active properties.

    Main Methods:

    • Utilized nonlinear stress-strain relationships to characterize myocardial tissue.
    • Applied large-deformation membrane theory to simulate the mechanical behavior of the ventricular wall.

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  • Compared the theoretical blowout potential of infarcted regions with properties of rubber versus passive myocardium.

    • Main Results:

    • Simulations indicate that infarcted regions with rubber-like elastic properties are prone to "blowout" under stress.
    • In contrast, infarcted regions composed of passive myocardial tissue demonstrate elastic stability and are unlikely to rupture or form aneurysms.
    • The study highlights the critical role of material properties in determining the mechanical fate of infarcted cardiac tissue.

    Conclusions:

    • The elastic properties of infarcted myocardial tissue are crucial in determining the risk of cardiac aneurysm or rupture.
    • Passive myocardium exhibits inherent stability, suggesting that factors beyond simple elastic instability may contribute to aneurysm formation in some cases.
    • Further research into the specific material changes post-infarction is warranted to fully elucidate aneurysm pathogenesis.