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Myocardial ischemia.

M Nakamura

    Japanese Circulation Journal
    |January 1, 1985
    PubMed
    Summary

    Coronary vasospasm can cause acute myocardial ischemia. New animal models and imaging techniques help measure infarct size and understand blood flow

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    Area of Science:

    • Cardiology
    • Ischemic Heart Disease
    • Animal Models

    Background:

    • Coronary vasospasm is a significant cause of acute myocardial ischemia.
    • Understanding vasospasm mechanisms is crucial for clinical cardiology.

    Purpose of the Study:

    • To develop and utilize animal models for studying coronary vasospasm and myocardial ischemia.
    • To quantitatively assess factors determining myocardial infarct size.

    Main Methods:

    • Administration of histamine or serotonin in atherosclerotic miniature swine to induce coronary vasospasm.
    • Monitoring early indicators of ischemia like systolic dysfunction and NADH production.
    • Quantitative measurement of preocclusive perfusion and collateral flow areas using double isotopes autoradiograms in dogs.

    Main Results:

    • Early systolic dysfunction and subendocardial NADH reduction occurred rapidly after coronary occlusion.
    • ST segment elevation was observed approximately 30 seconds after occlusion in isolated rat hearts.
    • A strong correlation was found between the salvaged myocardial area and collateral flow area in dogs.

    Conclusions:

    • Developed effective animal models for coronary vasospasm research.
    • Demonstrated the importance of perfusion and collateral flow in determining infarct size.
    • Highlighted the need for advancements in basic cardiology and research techniques.

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