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Amyopathic dermatomyositis.

N J Olsen1, J H Park, L E King

  • 1Division of Rheumatology, Department of Medicine, Vanderbilt University, T-3219 Medical Center North, Nashville, TN 37232, USA. nancy.olsen@mcmail.vanderbilt.edu

Current Rheumatology Reports
|July 27, 2001
PubMed
Summary

Amyopathic dermatomyositis presents with skin rash but no muscle weakness. Subtle muscle metabolism abnormalities may exist, and some patients may develop muscle weakness over time, impacting prognosis.

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Area of Science:

  • Rheumatology
  • Neurology
  • Dermatology

Background:

  • Amyopathic dermatomyositis (ADM) is a dermatomyositis variant with skin rash but no muscle weakness.
  • ADM and myopathic dermatomyositis may exist on a disease continuum, supported by genetic and longitudinal studies.
  • While typically lacking muscle weakness, ADM patients often report fatigue, suggesting underlying muscle dysfunction.

Purpose of the Study:

  • To define the characteristics of amyopathic dermatomyositis.
  • To explore the relationship between amyopathic and myopathic dermatomyositis.
  • To investigate potential subclinical muscle abnormalities and prognostic implications in ADM.

Main Methods:

  • Clinical evaluation for skin rash and muscle weakness.
  • Standard diagnostic tests: serum muscle enzymes, electromyography, muscle biopsy.
  • Advanced muscle assessment: P-31 magnetic resonance spectroscopy.
  • Review of patient history for fatigue and malignancy association.

Main Results:

  • ADM is characterized by skin rash without significant muscle weakness or abnormalities on standard tests.
  • Fatigue is a common symptom in ADM patients.
  • Sensitive tests like P-31 magnetic resonance spectroscopy indicate abnormal muscle metabolism in ADM.
  • A subset of ADM patients may progress to myopathic dermatomyositis.
  • Malignancy association, though not always present, is increasingly reported in ADM.

Conclusions:

  • ADM represents a distinct clinical entity within the dermatomyositis spectrum.
  • Subtle muscle metabolic alterations may underlie fatigue in ADM patients.
  • Distinguishing ADM from myopathic forms is crucial for prognostic assessment and management.
  • Ongoing research is needed to fully understand the ADM continuum and its long-term outcomes.

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