患者女性,63岁,因反复发作性胸闷、心悸、短阵昏厥10余年,加重一月于1984年5月入院,诊断冠心病、病态窦房结综合征、心房颤动及高血压病Ⅱ期。在右胸上部植入Edwards 30 VVI型按需起搏器(基础心率72.2次/分,起搏阈值1伏,电极导管阻抗740欧姆)。术后无昏厥发生,仅有时感心悸、胸闷、气急、经静脉注射西地兰或口服地戈辛及消心痛、复方丹参等处理好转。1991年5月又因右侧乳腺癌再次住本院,外科准备作乳腺癌根治手术。术前多次心电图及24小时动态心电图检查表明:基本心律为心房颤动、部分差异传导,偶见起搏信号,起搏间期0.83秒。因白天均呈心房颤动,室率较快,经静脉 The female patient, aged 63, was admitted to hospital for diagnosis of coronary heart disease, sick sinus syndrome, atrial fibrillation and essential hypertension for more than 10 years due to recurrent chest tightness, palpitation and short-sightedness. The Edwards 30 VVI on-demand pacemaker (basal heart rate 72.2 beats / min, pacing threshold 1 volt, lead impedance of 740 ohms) was implanted in the upper right chest. No postoperative syncope occurred, only the feeling of palpitations, chest tightness, shortness of breath, intravenous cedilanid or oral gexin and eliminate heartache, compound Danshen treatment improved. In 1991 May again because of right breast cancer hospital, surgical preparation for radical mastectomy. Multiple preoperative ECG and 24-hour Holter examination showed that: the basic rhythm of atrial fibrillation, some differential conduction, occasional pacing signal, pacing interval of 0.83 seconds. Due to the daytime were atrial fibrillation, ventricular rate faster, the vein