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Electromyography in polymyositis

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Compared to normal muscle, that in polymyositis shows:

  • reduced duration and amplitude of action potentials
  • greatly increased proportion of polyphasic action potentials
  • in severe weakness, the number of action potentials may be reduced
  • occasionally, there may be spontaneous fibrillations from the distal part of the neurone

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