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

Hiroyuki TomimitsuDepartment of Neurology, JA Toride Medical Center, Toride City, Ibaraki, Japan, Correspondence[email protected]

Akiko OhtaDepartment of Public Health, Saitama Medical University Faculty of Medicine, Moroyama-Machi, Iruma-Gun, Saitama, Japan,

Masaki NagaiDepartment of Public Health, Saitama Medical University Faculty of Medicine, Moroyama-Machi, Iruma-Gun, Saitama, Japan,

Motoko NishinaDepartment of Public Health, Saitama Medical University Faculty of Medicine, Moroyama-Machi, Iruma-Gun, Saitama, Japan,

Shoichiro IshiharaDepartment of Neurology and Neurological Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-Ku, Tokyo, Japan, and

Hitoshi KohsakaDepartment of Medicine and Rheumatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-Ku, Tokyo, Japan

Abstract

Objectives: This study aimed to investigate the clinical characteristics of polymyositis/dermatomyositis (PM/DM) in Japan by analyzing data from the nationwide registration system.

Methods: The data of the registration system in 2009 were analyzed to investigate patient numbers, sex, clinical symptoms, therapies, complications, and prognosis of PM/DM.

Results: The 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.

Conclusions: The 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.

Keywords::

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

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

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