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Myocardial fibre calcification

J McClure, A S Pieterse, D J Pounder

    Journal of Clinical Pathology
    |October 1, 1981
    PubMed
    Summary
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    Myocardial fiber calcification, seen in three post-mortem cases, involves hydroxyapatite crystal formation within mitochondria. This suggests a unifying mechanism for cardiac and skeletal muscle calcification due to fiber membrane dysfunction.

    Area of Science:

    • Cardiovascular Pathology
    • Cellular Biology
    • Mineral Metabolism

    Background:

    • Myocardial fiber calcification is a pathological process observed in cardiac tissue.
    • Understanding the mechanisms of myocardial calcification is crucial for diagnosing and treating related cardiovascular conditions.

    Observation:

    • Three post-mortem cases revealed myocardial fiber calcification.
    • One case presented with hypercalcemia and hyperphosphatemia, indicative of metastatic calcification.
    • Two cases exhibited ischemic myocardial necrosis with calcification in both necrotic and non-necrotic fibers, suggesting augmented dystrophic calcification due to hyperphosphatemia from renal failure.

    Findings:

    • Histological, histochemical, and ultrastructural analyses showed identical features across all cases.

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  • Hydroxyapatite crystal formation was initially observed within mitochondria, progressing to the cytosol and interstitium.
  • The fundamental lesion appears to be myocardial fiber membrane dysfunction.

    • Implications:

    • The findings suggest a common mechanism for calcification in both cardiac and skeletal muscle fibers.
    • This research may lead to a unified hypothesis explaining muscle fiber calcification in various myopathies.
    • Further investigation into fiber membrane dysfunction could reveal new therapeutic targets for calcific myopathies.