[A multi-center retrospective study of organ involvement in adult patients with polymyositis or dermatomyositis].
OBJECTIVE
To explore the prevalence and characteristics of main organ involvement in adult patients with polymyositis (PM) or dermatomyositis (DM) and determine their specific relative factors.


METHODS
Using unified questionnaire, we retrospectively collected the medical records of 1 387 confirmed adult PM/DM patients from 2007 to 2012 at 22 rheumatology centers in China. Statistical analyses were performed with chi-square or Fisher exact test and multivariate analyses with logistic regression.


RESULTS
A total of 1 387 patients were collected with 460 (33.2%) PM and 927 (66.8%) DM. The female:male ratio was 2.4: 1. Their onset age was ( 47 ± 14) years. A total of 1 031 (74.3%) patients had organ involvement. The prevalence of pulmonary involvement, arthritis, gastrointestinal and cardiac involvement were 44.6%, 32.3%, 21.9% and 20.3% respectively. The multivariate analysis indicated that older onset age (P < 0.01) was positively associated with pulmonary involvement while myalgia (P < 0.05) was negatively associated. Fever (P < 0.05), weight loss (P < 0.05) and Raynaud's phenomenon (P < 0.01) were positively associated with arthritis while muscle weakness (P < 0.05) negatively associated. Weight loss (P < 0.05), Raynaud's phenomenon (P < 0.01) and muscle weakness (P < 0.05) were positively associated with gastrointestinal involvement. Weight loss (P < 0.05) and swollen limbs (P < 0.05) were positively associated with cardiac involvement.


CONCLUSIONS
The prevalence of organ involvement is high in adult PM/DM patients. Our study may aid the diagnosis of organ damage in PM/DM patients.
Graduate School of Peking Union Medical College & Chinese Academy of Medical Sciences, China-Japan Friendship Hospital, Department of Rheumatology, Beijing 100730, China.
Qianzi
Q
Zhan
Email: guochunwang@hotmail.com.
Guochun
G
Wang
Xiangyuan
X
Liu
Jianglin
J
Zhang
Rong
R
Mu
Xiaoxia
X
Zuo
Xiaofeng
X
Li
Lijun
L
Wu
Lu
L
Gong
Hongbin
H
Li
Xiaofei
X
Wang
Dongbao
D
Zhao
Jin
J
Lin
Shaoxian
S
Hu
Cheng
C
Zhao
Feng
F
Zhan
Bin
B
Zhou
Yi
Y
Wang
Kexia
K
Chai
Yi
Y
Gong
Li
L
Luo
Lie
L
Dai
Yongfu
Y
Wang
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003882:Dermatomyositis / Q000473:pathology*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D017285:Polymyositis / Q000473:pathology*; D012189:Retrospective Studies; D055815:Young Adult