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[Mitochondrial myopathy with peripheral neuropathy].

Y P Guo1

  • 1Dept. of Neurology, PUMC Hospital, Beijing.

Zhonghua Shen Jing Jing Shen Ke Za Zhi = Chinese Journal of Neurology and Psychiatry
|October 1, 1992
PubMed
Summary

This study details two male patients with mitochondrial myopathy and peripheral neuropathy, presenting with limb weakness and paralysis. Muscle biopsies revealed characteristic mitochondrial abnormalities, highlighting the complex interplay between muscle and nerve dysfunction.

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Area of Science:

  • Neurology
  • Genetics
  • Cell Biology

Background:

  • Mitochondrial myopathies are a group of inherited disorders affecting muscle energy production.
  • Peripheral neuropathy can be a significant extra-muscular manifestation of mitochondrial diseases.
  • Understanding the specific phenotypes and underlying pathology is crucial for diagnosis and management.

Observation:

  • Two male patients, aged 22 and 32, presented with recurrent paralysis and limb asthenia.
  • Case 1 exhibited motor sensory neuropathy with neurogenic injury on EMG.
  • Case 2 showed lower limb involvement and elevated lactic acid levels.

Findings:

  • Muscle biopsies in both cases demonstrated Ragged Red fibers and abnormal mitochondria.
  • Sural nerve biopsies indicated reduced myelinated fibers and chronic axonal degeneration.
  • Electron microscopy revealed increased Schwann cells and mitochondria, with less marked abnormalities in Case 2.

Implications:

  • This case report contributes to the understanding of mitochondrial myopathy with peripheral neuropathy phenotypes.
  • It underscores the importance of combined muscle and nerve investigations for accurate diagnosis.
  • Further research into the pathogenesis of these complex disorders is warranted.

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