近来，包涵体肌炎、皮肌炎、多发性肌炎中几种免疫细胞类型和免疫反应过程被认定。

Several immune system cell types and processes have been recently identified in muscle in inclusion body myositis dermatomyositis and polymyositis.

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目的：探讨多发性肌炎和皮肌炎起病不同时间的肌电图与肌酶的演变规律。

Objective:To study the difference of electromyography(EMG) and muscle enzyme(ME) in the progression of polymyositis(PM) and dermatomyositis(DM).

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从临床表现、生化检查、肌电图及肌肉活检等方面进行分析，提出多发性肌炎与皮肌炎的诊断条件。

Analysing the data of the clinical manifestations, biochemical tests, electromyographes and muscular biopsies, the authors proposed the diagnostic criteria of polymyositis and dermatomyositis.

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