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Eosinophilia–myalgia syndrome: Myopathic electrodiagnostic characteristics
Author(s) -
Tanhehco Justina L.,
Wiechers David O.,
Golbus Joseph,
Neely Sarah E.
Publication year - 1992
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.880150505
Subject(s) - myalgia , medicine , myopathy , electromyography , peripheral neuropathy , muscle biopsy , mononeuropathy , etiology , pathology , biopsy , physical medicine and rehabilitation , endocrinology , diabetes mellitus
Eosinophilia–myalgia syndrome (EMS) is disorder characterized by generalized muscle pain and eosinophilia. The etiology of this syndrome appears to be related to the ingestion of L ‐tryptophan. Most studies to date describe an associated peripheral neuropathy or combined myopathy and peripheral neuropathy. This report presents 2 EMS patients with myopathy, confirmed by muscle biopsy in 1 case and electrophysiology in both cases. No clinical evidence of neuropathy was found. Both routine and single fiber electromyography failed to demonstrate abnormalities, suggesting neuropathy. Electrodiagnostic abnormalities paralleled the clinical course. After 10 months, both patients continued to have symptoms of muscle cramping and reduced endurance, with mild electromyographic abnormalities, perhaps reflecting changes in their motor unit.