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Metabolic myopathies.

F Gullotta

    Pathology, Research and Practice
    |July 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Metabolic myopathies, including glycogenoses and mitochondrial myopathies, often show muscle fiber vacuolation or "ragged-red fibers." Suspect metabolic myopathy in unexplained rhabdomyolysis, as histology alone may not reveal the biochemical defect.

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    Area of Science:

    • Neurology
    • Biochemistry
    • Genetics

    Background:

    • Metabolic myopathies are a frequent cause of muscle disease in children and adults.
    • Common types include glycogenoses, neutral fat myopathies, and "mitochondrial" myopathies.

    Observation:

    • Glycogenoses and neutral fat myopathies often present with muscle fiber vacuolation.
    • Mitochondrial myopathies are characterized by impaired mitochondrial function, sometimes visible as "ragged-red fibers" with specific ultrastructural changes.

    Findings:

    • While enzyme defects are known for glycogenoses, some neutral fat myopathies involve carnitine metabolism or unidentified biochemical defects.
    • Mitochondrial myopathies represent heterogeneous syndromes signaling impaired mitochondrial function due to underlying biochemical defects.

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    Implications:

    • Myoglobinuria is a key clinical symptom; "idiopathic" rhabdomyolysis warrants suspicion of metabolic myopathy.
    • Negative histological findings do not exclude metabolic disorders, emphasizing the need for biochemical investigation.
    • Advancements in therapy for metabolic myopathies depend on strong collaboration between morphologists and biochemists.