患者许×,男,37岁,主因双下肢力弱半年,加重2月入院。患者半年来无诱因常感到双下肢力弱,上楼费力,经常跌倒,近2个月来,感双下肢力弱明显加重,跌倒次数增多,腰部有酸痛感,下蹲后起立困难,一周前到附近医院就诊查血K+:3.1mmol/L,考虑为低钾性周期性麻痹,给口服及静脉补钾治疗, Xu × patients, male, 37 years old, mainly due to weak legs of both lower extremities, increased in February admitted. Patients with no incentive for six months often feel both lower extremity weak, upstairs laborious, often fall, the past two months, a sense of weakness increased significantly lower limbs, increased number of falls, a sore waist, standing squat difficult, a week ago To the nearby hospital for blood test K +: 3.1mmol / L, considered hypokalemic periodic paralysis, oral and intravenous potassium treatment,