Objective To investigate the diagnositic value of single fiber electromygraphy (SFEMG) in motor neuron disease (MND) and study the relationship among the abnormal SFEMG, disease type and disease severity.

• 目的研究单纤维肌电图（SFEMG）对运动神经元病的辅助诊断价值及探讨单纤维肌电图异常率与其病型、病情的关系。