现已明确,呈网状结构的房室交界区,其解剖或功能容易发生分离。当发生横向分离时,房室之间的传导可出现不同水平面的阻滞(双层或多层阻滞),相反,发生纵向分离时,将出现传导速度与不应期长短截然不同的快、慢双径路,甚至多径路。房室结双径路是发生房室结折返性心动过速(AV nodal reentrant tachycardia,AVNRT)必需的解剖学基础,当在两条径路出现激动的环形运动时将引发室上速。晚近,有学者提出了与房室结双径路相关的另一种室上速,称为双房室结非折返性心动过速(dual It is now clear that the reticular structure of the atrioventricular junction area, its anatomy or function prone to separation. When lateral separation occurs, the conduction between atrio-ventricular can block at different levels (double or multi-layer block). On the contrary, when longitudinal separation occurs, there will be a very different conduction velocity and refractory period, Slow dual path, or even multipath. AVN is the necessary anatomic basis for the development of AV nodal reentrant tachycardia (AVNRT), which triggers supraventricular tachycardia when an excited circular motion occurs on both pathways. Recently, some scholars have proposed another room with atrioventricular junction pathways of dual supraventricular tachycardia, known as dual-ventricular nodal reentrant tachycardia (dual