患者。女性，43岁。因四肢麻木无力四夭人院．四天前腹泄水样便，于夜间小便时感觉双下肢无力，不能站立，三天前双上肢麻木无力，手不能持物来诊。腹泄时未服用“痢特灵”。查体：神清，语利，双眼向两侧侧视可见细小眼疾，余颅神经（一）。四肢远、近端肌力近五级，肌张力低? patient. Female, 43 years old. Four limbs due to numbness limb weakness hospital. Four days ago, abdominal diarrhea, watery stools, feels both lower extremities weakness during the night urination, can not stand, three days ago, upper limb numbness weakness, hands can not hold objects to the clinic. No diarrhea when taking “furazolidone.” Physical examination: God clear, language profit, both sides of the eye to see the small side of the eye disease, cranial nerves (a). Far limbs, proximal muscle nearly five, low muscle tension?