患者男,77岁,因头晕、乏力、反复阵发性晕厥1年,加重5 d以晕厥原因待查收住我科。患者于1年前无明显原因出现从卧位直立时感头晕、四肢无力、多汗,随之跌倒,意识不清,倒地数秒后神志清醒,醒后感头晕及打哈欠,无抽搐、视物旋转,经平卧休息3~5 min症状可消失。之后在站立时上述症 Male patient, 77 years old, because of dizziness, fatigue, recurrent paroxysmal syncope for 1 year, increased 5 d to check the reasons for syncope to live in our department. Patients with no obvious cause 1 year ago, when standing upright feeling dizzy, limb weakness, sweating, then fall, unconsciousness, fell to the ground after a few seconds consciousness, wake up feeling dizzy and yawn, no convulsions, depending on Rotate, rest by lying 3 ~ 5 min symptoms can disappear. After standing above the disease