患者,男,40岁。2009年3月16日因“牙龈炎”门诊给予克拉霉素片(杭州中美华东制药有限公司,批号081002)0.25g,po bid。服药后患者觉胸闷、心悸伴头晕,呈阵发性、反复发作,每次持续3～4h,发作与是否活动无关,无胸痛、气急,无畏寒、发热。3月18日住院治疗,体检:T 36.6℃,BP Patient, male, 40 years old. March 16, 2009 because of “gingivitis ” outpatient clinic to give clarithromycin tablets (Hangzhou Sino-US East China Pharmaceutical Co., Ltd., batch number 081002) 0.25g, po bid. After taking medicine, patients feel chest tightness, palpitations with dizziness, paroxysmal, recurrent, each lasting 3 ~ 4h, the seizure has nothing to do with activity, no chest pain, shortness of breath, no chills, fever. March 18 hospitalization, physical examination: T 36.6 ℃, BP