Drug Induced Myopathies

Corticosteroid myopathy:

Statin myopathy:

Ziduvodine Mitochondrial myopathy:

+Muscle biopsy:
  • Ragged red fibres. COX negative fibres, Pleomorphic mitochondria
  • Distinguishes it from HIV associated inflammatory myopathy

Choroquine neuromyopathy

+Muscle biopsy:

Vacuolar myopathy, especially in type 1 fibres. PAS positive.
Electron microscopy: muscle and nerve. Membranous whorlings, myelin figures, curvilinear inclusions.

Hypokalemic drugs:

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