Conlusions The spontaneous activity in EMG could be found in the very early stage of ALS,which suggests lower motor neurons may be involved, if present, MUPs area and amplitude increasing in quantitative EMG are the significant feature of ALS.

• 结论ALS患者早期阶段如出现自发电位,即为下运动神经元受累的特征表现; 定量EMG检查中运动单位面积和波幅增大是其显著特点。