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Neuromuscular changes in hypertrophic cardiomyopathy

O Franch, A Cabello, J Iglesias

    Acta Neuropathologica. Supplementum
    |January 1, 1981
    PubMed
    Summary

    Primary hypertrophic cardiomyopathy can affect skeletal muscles, showing mild enzyme increases and slight electrophysiological abnormalities. Histological findings were mostly non-specific, with minimal denervation atrophy observed.

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    Area of Science:

    • Cardiology
    • Neurology
    • Muscle Physiology

    Background:

    • Primary hypertrophic cardiomyopathy (HCM) is a cardiac condition.
    • Skeletal muscle involvement in HCM is not well-understood.
    • Investigating muscle changes can provide insights into systemic effects of HCM.

    Purpose of the Study:

    • To investigate skeletal muscle affectation in patients with primary hypertrophic cardiomyopathy.
    • To correlate clinical, electrophysiological, and histological findings in skeletal muscle.

    Main Methods:

    • Clinical examination of 12 patients with primary hypertrophic cardiomyopathy.
    • Electrophysiological studies including peripheral nerve conduction and electromyography (EMG).
    • Skeletal muscle biopsy for histological analysis.

    Main Results:

    • Mild elevation in serum muscle enzymes observed in 8/12 patients.
    • Slight electrophysiological abnormalities noted in all patients: peripheral neuropathy (4/12), myopathic pattern (4/12), or mixed (4/12).
    • Histological examination revealed non-specific changes like fiber atrophy and myofibrillar disorganization in most patients, with denervation atrophy in only 2/12.

    Conclusions:

    • Skeletal muscle abnormalities are present in primary hypertrophic cardiomyopathy, though often subtle.
    • Electrophysiological studies are more sensitive than histology in detecting these changes.
    • Non-specific histological alterations are the most common findings in HCM-related skeletal myopathy.

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