Conclusion EMG may be an important means of diagnosing DM.Selection of quadriceps, biceps and anterior tibial muscles for EMG may be helpful in increasing the positive rate of EMG.

• 结论肌电图检查是诊断DM的重要手段，选择股四头肌、胫前肌及肱二头肌进行EMG检查阳性率最高。