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Journal of the Korean Academy of Rehabilitation Medicine 1984;8(2):10.
Electromyographic Study of Polymyositis and Dermatomyositis
Tai Ryoon Han, M.D. , Eung Jin Lee, M.D.
Department of Rehabilitation Medicine, Seoul National University Hospital
다발성 근염 및 피부근염의 근전도적 연구
한태륜, 이응진
서울대학교 의과대학 재활의학과

From Jan 1978 to Dec. 1983, 39 cases of polymyositis and dermatomyositis which were diagnosed by clinical findings, electromyography, clinical laboratory and biopsy at Seoul National University Hospital were analysed in a retrospective study.

The results obtained were as follows:

1) The peak age incidence is the second decade(35.7%); female incidence is as much as 3 times that of males.

2) Among the 39 cases, 97.4% showed positive findings in symptoms, 92.2% in EMG examination, 86.4% in muscle enzyme and 74.3% in biopsy.

3) In EMG examination, abnormal findings appear in proximal muscle in a high ratio: Deltoid muscle showed abnormality in 88.2% of all examined muscles, Tensor Fascia Lata in 65.7% and Tibialis Anterior in 62.7%.

4) All cases in which the duration of symptoms was between 2 months and years showed abnormal EMG findings. But cases with less than 2 months or more than 2 years duration showed abnormal EMG findings in 80% of all patients. But it seems that the findings cannot be considered significant because of the small number of cases.

Key Words: Polymyositis, Dermatomyositis, Electromyography, Biopsy, Muscle enzyme


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