How does polymyositis affect respiratory muscles?

Updated: Jun 13, 2020
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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In advanced cases and rarely in acute cases, respiratory muscles are affected. Severe weakness is almost always associated with muscular wasting. Dysphonia with nasal speech may be noted. Lung examination findings may include evidence of interstitial lung disease, such as dry inspiratory crackles ("Velcro") in the lung bases.

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