Difference between revisions of "Dermatomyositis"

(Clinical Features)
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*Viral myositis
*Viral myositis
*Rheumatoid arthritis
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==See Also==
==See Also==
*Rheumatoid arthritis
[[Category: Rheum]][[Category: Derm]]
[[Category: Rheum]][[Category: Derm]]

Revision as of 13:48, 20 July 2015


  • Inflammatory myopathy
  • Affects proximal muscles > distal
  • Female:Male; 2:1
  • Peak incidence 40-50s

Clinical Features


  • Proximal greater than distal weakness
    • Deltoid and hip flexors
    • difficulty standing from a chair
  • Onset over months
  • Mild myalgias


  • Heliotrope rash on face scalp
  • Gottron's papules (rash on MCP, PIP, and DIP joints)
  • Shawl sign (rash above shoulders)


  • Cardiac (cardiomyopathy)
  • High association with malignancy
  • Interstial lung disease

Differential Diagnosis


  • CK
  • ANA
  • Chem for creatinine
  • Troponin, can involve myocardium
  • EKG
  • Bedside PFTs (FEV1 and FVC)
  • UA for myoglobin
  • Consider malignancies


Mild disease

  • Prednisone 1mg/kg/day (up to 80mg/day)
    • Taper after 6-8 weeks

Severe disease

  • Respiratory muscle symptoms of CHF
    • Methylprednisolone 1000mg/day x 3 days


  • Admit to monitored bed for CHF symptoms, respiratory muscle weakness
  • Admit for dysphagia/aspiration risk
  • Out patient follow up with muscle biopsy for others

See Also