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Related Experiment Videos

Morphological changes in endocardium subjected to global ischaemia.

G Carter, J B Gavin

    Basic Research in Cardiology
    |September 1, 1986
    PubMed
    Summary

    Severe ischemia causes progressive damage to the heart

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    Area of Science:

    • Cardiovascular Biology
    • Cellular Pathology
    • Ischemic Heart Disease Research

    Background:

    • Endocardial integrity is crucial for cardiac function.
    • Severe ischemia can lead to significant cellular damage.
    • Understanding endocardial responses to ischemia is vital for developing protective strategies.

    Purpose of the Study:

    • To investigate the sequential morphological alterations in the endocardium during prolonged global ischemia.
    • To characterize the cellular and ultrastructural changes in the rat heart endocardium under ischemic conditions.

    Main Methods:

    • Isolated rat hearts were subjected to global ischemia at 37°C for 0-12 hours.
    • Morphological changes in the endocardium were examined using microscopy.
    • Ultrastructural analysis focused on endothelial cells and myocytes.

    Main Results:

    • Early ischemia (1+ hours) induced crater-like depressions, blebs, nuclear changes, and mitochondrial swelling in endothelial cells.
    • Progressive endothelial cell separation and desquamation occurred after 2+ hours of ischemia.
    • Prolonged ischemia (4-12 hours) led to the exposure of subendothelial connective tissue and cardiac muscle cells.

    Conclusions:

    • Severe global ischemia induces a time-dependent sequence of morphological damage to the cardiac endocardium.
    • Endothelial cell detachment and loss expose deeper cardiac structures to ischemic injury.
    • These findings highlight the vulnerability of the endocardium to prolonged ischemia.

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