Abstract:
:Polymyositis is classified as a separate entity among idiopathic inflammatory myopathies but it is considered as the least common since it is an exclusion diagnosis. This myopathy usually presents with subacute-chronic symmetric proximal limb weakness, although some extramuscular manifestations are common. Creatine kinase values may be increased up to 50-fold in active disease. Muscle biopsy is characterized by endomysial inflammatory infiltrate consisting predominantly of CD8+ T cells that invade healthy muscle fibres expressing the MHC-I antigen. Although serum autoantibodies, EMG and imaging techniques can help in diagnosis, muscle histopathology is a pivotal value. The clinical picture together with the pathological findings confers the also called PM pattern. A broad differential diagnosis is needed before concluding a diagnosis of pure PM. Sporadic inclusion-body myositis, toxic, endocrine and metabolic myopathies as well as muscular dystrophies are the major categories to be ruled out. Finally, a diagnostic algorithm for suspected cases of PM is also proposed.
journal_name
J Autoimmunjournal_title
Journal of autoimmunityauthors
Milisenda JC,Selva-O'Callaghan A,Grau JMdoi
10.1016/j.jaut.2014.01.025subject
Has Abstractpub_date
2014-02-01 00:00:00pages
118-21eissn
0896-8411issn
1095-9157pii
S0896-8411(14)00028-6journal_volume
48-49pub_type
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pub_type: 杂志文章,meta分析,评审
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journal_title:Journal of autoimmunity
pub_type: 社论,历史文章
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journal_title:Journal of autoimmunity
pub_type: 杂志文章,评审
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journal_title:Journal of autoimmunity
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1996-08-01 00:00:00
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pub_type: 杂志文章
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