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心率的突然变化可引起各种症状,18世纪中叶,摩、阿、斯三氏曾报告一组间歇性心率减慢或心跳停搏伴有意识丧失,甚至死亡的病例。以后认识到这种症状的心动过缓是原发性房室传导障碍所引起,而晕厥的机制可能是由于心脏停搏或是室性过速型节律紊乱伴传导阻滞。 最近文献中报告了另一组有晕厥而无房室阻滞的病例,患者共同的电生理缺陷是窦房结
Sudden changes in heart rate can cause a variety of symptoms. In the mid-18th century, Morris, Ah, and Stearns reported a group of cases of intermittent or slow heartbeat associated with loss of consciousness and even death. After the realization of this symptom of bradycardia is caused by atrioventricular conduction disorders, and the mechanism of syncope may be due to cardiac arrest or ventricular tachyarrhythmia with conduction block. Recent reports of another group of patients with syncope without atrioventricular block, the common electrophysiological defect in patients with the sinoatrial node