Myopathy

Etiology

  • Alcoholism
  • Endocrine: hypothyroidism, hyperthyroidism, Cushing’s syndrome
  • Chronic hypokalemia
  • Polymyositis
  • Dermatomyositis
  • HIV myopathy
  • Hyperparathyroidism
  • Muscular dystrophy, eg, Duchenne, Becker, limb-girdle, facioscapulohumeral (FSH)
  • Myotonic dystrophy
  • Myotonia congenita
  • Inclusion body myositis
  • Mitochondrial myopathy
  • Sarcoidosis
  • Drugs: corticosteroids, statins, clofibrate, colchicine, chloroquine, zidovudine, emetine, aminocaproic acid, bretylium, penicillamine, drugs causing hypokalemia

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