我们遇到一家两代(母子三人)三例重症肌无力患者,报告如下: 例1,女,45岁,因四肢劳累后无力20余年,于1984年5月26日入院。患者从16岁起出现运动后易疲劳,四肢无力,逐年加重。入院查体,神志清、智力正常、不能行走,下蹲后不能站起,两上肢上举不能过肩。肩胛肌,三角肌,臀大肌均有萎缩。膝腱反射消失,病理反射阴性,血尿常规正常,肝功正常,24小时尿钾43.89克当量, We met with two generations (three mothers and three) of three patients with myasthenia gravis. The report is as follows: Example 1, female, 45 years old, was hospitalized on May 26, 1984 after more than 20 years of inability to get exhausted. Patients from the age of 16 appear prone to fatigue after exercise, limb weakness, increasing year by year. Admission examination, delirious, mental normal, can not walk, can not stand up after squatting, two upper limb on the move can not cross the shoulder. Scapular muscle, deltoid, gluteus maximus have atrophy. Knee tendon reflex, pathological reflex negative, normal urine and urine, normal liver function, urinary potassium 43.89 grams equivalent 24 hours,