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Myocardial morphometric characteristics in swine

S Singh, F C White, C M Bloor

    Circulation Research
    |August 1, 1981
    PubMed
    Summary

    This study quantifies myocardial cell ultrastructure in Yucatan swine, revealing regional differences in mitochondria and sarcoplasmic reticulum. These findings support swine as a model for cardiac morphometric research.

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    Area of Science:

    • Cardiovascular Biology
    • Cellular Ultrastructure
    • Comparative Anatomy

    Background:

    • Understanding myocardial cell ultrastructure is crucial for diagnosing cardiac conditions.
    • Swine are increasingly used as large animal models in physiological research.

    Purpose of the Study:

    • To quantitatively analyze the ultrastructure of myocardial cells in normal Yucatan swine.
    • To investigate regional variations in subcellular components within the swine heart.
    • To establish the suitability of swine for detailed cardiac morphometric studies.

    Main Methods:

    • Tissue samples from 20 sites in six normal Yucatan swine ventricles and septum were analyzed.
    • Electron microscopy and stereological morphometric methods were employed.
    • Relative volumes of myofibrils, mitochondria, transverse tubular system, sarcoplasmic reticulum, and intracellular space were quantified.

    Main Results:

    • Subcellular component distribution was largely homogeneous across sampling sites.
    • Mitochondrial:myofibril volume ratios were higher in the left ventricle and septum, and in endocardial vs. epicardial regions.
    • Sarcoplasmic reticulum:myofibril ratios were greater in endocardial and basal regions, indicating localized metabolic and calcium handling demands.

    Conclusions:

    • Yucatan swine exhibit regional variations in myocardial ultrastructure, particularly in mitochondria and sarcoplasmic reticulum.
    • These findings validate the Yucatan swine as a suitable model for quantitative morphometric analysis of normal and diseased hearts.
    • The study provides a foundation for future research on regional cardiac changes in swine models.

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