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Related Experiment Videos

Diagnostic difficulties in myasthenia gravis

J Maher1, F Grand'Maison, M W Nicolle

  • 1Department of Medicine, The University of Manitoba, Health Sciences Centre, Winnipeg, Canada.

Muscle & Nerve
|May 8, 1998
PubMed
Summary

Diagnosing myasthenia gravis can be challenging when patients present with severe respiratory and bulbar weakness, especially with negative antibody tests. Corticosteroid treatment improved symptoms and electrophysiological findings, suggesting its utility in such cases.

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Area of Science:

  • Neurology
  • Clinical Electrophysiology

Background:

  • Myasthenia gravis (MG) typically involves limb and ocular muscles.
  • Severe, isolated bulbar and respiratory muscle weakness is an atypical presentation of MG.

Observation:

  • Four patients with MG presented with severe, isolated bulbar and respiratory muscle weakness.
  • All patients had negative anti-acetylcholine receptor (anti-AChR) antibody titers.
  • Electrophysiological studies showed low-amplitude diaphragmatic potentials and abnormal spontaneous activity in respiratory muscles.

Findings:

  • Only one patient exhibited a significant decremental response initially.
  • Corticosteroid treatment led to clinical improvement and normalization of electrophysiological findings, including positive decremental responses.
  • Standard electrodiagnostic criteria for MG were not consistently met.

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Implications:

  • Atypical MG presentations can mislead diagnosis due to negative serology and electrodiagnostic findings.
  • Tensilon testing, clinical presentation, and a trial of immunosuppression are crucial for diagnosing challenging MG cases.
  • This study highlights the importance of considering MG even with unusual symptom patterns and initial non-diagnostic tests.