Results The main clinical presentations of PM/DM included amyosthenia, muscular tenderness, elevation of serum enzymes, accompanied by abnormal electromyography and muscular pathology.

结果PM/DM以肌无力、肌肉压痛、血清肌酶谱增高为主要临床表现，伴肌电图及病理学检查异常；

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

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。

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