患儿女 ,1岁 3个月。因双眼睑下垂 ,全身无力 1个月 ,呼吸困难 6小时 ,于 1998年 11月 10日急诊入院。患儿 1个月前出现双侧眼睑下垂 ,晨起时较轻 ,午后加重。同时常出现全身发软 ,颈部无力 ,头抬不起来 ,手持物无力 ,走路易跌跤及发音嘶哑等。近 2天患儿感冒后肌无力加重 ,喉 Children with children, 1 year and 3 months. Due to double eyelid ptosis, general weakness 1 month, breathing difficulties 6 hours, on November 10, 1998 emergency admission. Bilateral eyelid ptosis appeared in children 1 month ago, lighter at morning and aggravated at afternoon. At the same time often appear whole body weakness, weakness of the neck, head lift can not afford, hand-held weakness, easy to fall and hoarseness and so on. Nearly 2 days after the onset of colds in children with aggravated weakness, throat