Methods: The following data were obtained through 112 amyotrophic lateral sclerosis (ALS). Three groups can be distinguished:(1) definite ALS (43) (2) possible ALS(38) (3) suspected ALS (31).

• 方法:将112例ALS患者分为确诊43例,拟诊38例,可疑31例,其中确诊、拟诊的患者代表典型ALS患者,可疑组均为单纯下运动神经元综合征的患者。