• Modern rheumatology · Jan 2016

    Epidemiologic analysis of the clinical features of Japanese patients with polymyositis and dermatomyositis.

    • Hiroyuki Tomimitsu, Akiko Ohta, Masaki Nagai, Motoko Nishina, Shoichiro Ishihara, and Hitoshi Kohsaka.
    • a Department of Neurology , JA Toride Medical Center , Toride City , Ibaraki , Japan .
    • Mod Rheumatol. 2016 Jan 1; 26 (3): 398-402.

    ObjectivesThis study aimed to investigate the clinical characteristics of polymyositis/dermatomyositis (PM/DM) in Japan by analyzing data from the nationwide registration system.MethodsThe data of the registration system in 2009 were analyzed to investigate patient numbers, sex, clinical symptoms, therapies, complications, and prognosis of PM/DM.ResultsThe total number of PM/DM cases was approximately 17,000, and the female/male sex ratio was 2.7:1. Almost all patients improved as a result of therapy, but many suffered from sequelae such as muscle weakness.ConclusionsThe results characterize significant aspects of Japanese PM/DM patients. However, a further prospective survey is required to clarify the true epidemiology and natural history of PM/DM.

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