Jensen G, Sigurd B, Sandoe E
Chest. 1975 Jan;67(1):43-8. doi: 10.1378/chest.67.1.43.
One hundred and twelve patients with heart block and chronic tendency to syncope were ECG-monitored during syncope. Ventricular tachycardia and/or fibrillation (VT-VF) was observed as the cause of syncope in 11 patients: in 6 of 20 patients with chronic third degree A-V block, in 3 of 65 with paroxysmal A-V block and in 2 of 27 with S-A block. The R-R interval preceding the escape beat which initiated VT-VF varied between 1.2 and 2.2 seconds. The cerebral attacks were amenable to long-term pacemaker treatment. However, relapses of VT-VF were observed during pacing with a low rate of 55 per minute and during short interruptions in pacing, as produced by intermittent pacemaker failure or threshold determination. In one patient, supplementary treatment with a beta-blocking agent had to be given to suppress exercise-induced attacks of VT-VF after pacemaker implantation.
112例患有心脏传导阻滞且有慢性晕厥倾向的患者在晕厥期间接受了心电图监测。观察到11例患者的晕厥原因是室性心动过速和/或心室颤动（VT-VF）：20例慢性三度房室传导阻滞患者中有6例，65例阵发性房室传导阻滞患者中有3例，27例窦房阻滞患者中有2例。引发VT-VF的逸搏前的R-R间期在1.2至2.2秒之间变化。这些脑部发作适合长期起搏器治疗。然而，在以每分钟55次的低心率起搏期间以及在起搏出现短暂中断时（如由间歇性起搏器故障或阈值测定引起），观察到VT-VF复发。在1例患者中，起搏器植入后必须给予β受体阻滞剂辅助治疗以抑制运动诱发的VT-VF发作。
