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为了更好地诊断皮肌炎，作者检测了３７例皮肌炎患者的骨骼肌肌电图，观察其电生理变化。结果显示疾病组患者患肌运动单元电位（ＭＵＰ）平均时程、波幅、上升时限、面积、面积波幅比及波形指数均较正常对照组降低（Ｐ＜０．０５或Ｐ＜０．０１），其中尤以波形指数和面积的改变显著（Ｐ＜０．０１），但患者左右两侧肌肉ＭＵＰ比较没有显著性差异（Ｐ＞０．０５）。认为ＭＵＰ定量分析对皮肌炎的诊断具有重要意义，ＭＵＰ波形指数和面积具有临床应用价值。
In order to diagnose dermatomyositis better, the authors examined the electromyogram of skeletal muscles of 37 patients with dermatomyositis and observed their electrophysiological changes. The results showed that the mean duration, amplitude, rising time limit, area, area amplitude ratio and waveform index of MUP in the disease group were significantly lower than those in the normal control group (P <0.05 or P <0.01) Among them, the changes of waveform index and area were significant (P <0.01), but there was no significant difference in muscle MUP between the left and right sides of the patients (P> 0.05). MUP quantitative analysis of the diagnosis of dermatomyositis is of great significance, MUP waveform index and area has clinical value.