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26 May 2017 : Clinical Research  

Associated Variables of Myositis in Systemic Lupus Erythematosus: A Cross-Sectional Study

Yan Liang1BCDEF, Rui-Xue Leng1EF, Hai-Feng Pan1CD, Dong-Qing Ye1AG*

DOI: 10.12659/MSM.902016

Med Sci Monit 2017; 23:2543-2549

Abstract

BACKGROUND: This study aimed to estimate the point prevalence of myositis and identify associated variables of myositis in systemic lupus erythematosus (SLE).

MATERIAL AND METHODS: Clinical date of patients hospitalized with lupus at the First Affiliated Hospital of Anhui Medical University and Anhui Provincial Hospital were collected. Patients were defined as having myositis if they reported the presence of persistent invalidating muscular weakness combined with increased levels of creatine phosphokinase (CPK) and abnormal electromyography (EMG).

RESULTS: The study sample comprised 1701 lupus patients, of which 44 had myositis. Patients with SLE-associated myositis are more likely to have skin rash, alopecia, pericarditis, vasculitis, anti-Sm, anti-RNP, anti-dsDNA, thrombocytopenia, leukopenia, low C3, low C4, high erythrocyte sedimentation rate (ESR), high D-dimer, and active disease. Multivariate logistic regression found positive associations between leukopenia, alopecia, and active disease with myositis. Negative associations between myositis with the use of corticosteroids or immunosuppressive drugs were revealed in univariate and multivariate analysis.

CONCLUSIONS: The point prevalence of myositis was 2.6% in SLE patients. The significant association of alopecia, leukopenia, and active disease with myositis suggests that organ damage, hematological abnormality, and high disease activity promote the progression of myositis in lupus patients.

Keywords: Lupus Erythematosus, Systemic, myositis, Prevalence, Risk Factors

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750