临床常能见到突发而不好解释的晕厥患者,这些患者的心脏及心电图常正常,晕厥发作前无任何先兆。其临床特点与血管迷走性晕厥全然不同,而类似于特发性阵发性房室阻滞的患者。[定义]低腺苷晕厥(low adenosine syncope)也称低腺苷综合征,常在中年(>40岁)开始发病,突发晕厥而无前驱症状,其心脏结构及心电图正常。这些患者存在的临床特征和血浆低腺苷浓度一致而成为一种新类型的晕厥,其与血管迷走性晕厥不同,提示与 Patients with syncope who can often see sudden and poor interpretations of the clinic are often normal in their heart and ECG, with no warning before the onset of the seizure. Its clinical features and vasovagal syncope completely different, but similar to idiopathic paroxysmal atrioventricular block patients. [Definition] Low adenosine syncope, also known as hypoadenosine syndrome, often begins in middle age (> 40 years) with sudden onset of syncope without prodromal symptoms and normal cardiac structure and electrocardiogram. The presence of these patients with the same clinical features and plasma concentrations of adenosine has become a new type of syncope, which is different from vasovagal syncope, suggesting that