重症肌无力 (MG)是一种神经肌肉接头 (突触 )间传递功能障碍的自身免疫性疾病。其特征为受累骨骼肌无力 ,运动后易疲劳 ,休息或用抗胆碱酯酶 (抗 Ach E)药物后症状减轻或消失。按受累肌肉部位不同 ,分为眼肌型、球型及全身型。MG可有肌无力危象 ,MG患儿突然发生重度肌无力和因 Myasthenia Gravis (MG) is an autoimmune disease that transmits dysfunction between neuromuscular junctions (synapses). It is characterized by impaired skeletal muscle weakness, fatigue after exercise, reduced or disappeared symptoms after resting or with anticholinesterase (anti-Ach E) medication. According to different parts of the muscle involved, divided into ocular muscle, spherical and systemic. MG may have myasthenic crisis, MG patients with severe muscle weakness and sudden onset