阵发性室上性心动过速(PSVT)是临床常见的心律失常,其发生机制,绝大多数系“折返激动”,在折返性室上速中,58～69%为房室结内折返,15～30%为房室旁道折返(隐性或显性预激征)。大量临床电生理学研究揭示,房室结折返性心动过速(AVNRT)与房室结内双径路(DAVNP)密切有关,认为这是导致激动折返的病理 Paroxysmal supraventricular tachycardia (PSVT) is a common clinical arrhythmia, the mechanism of its occurrence, the vast majority of “reentry excitement”, in the reentry supraventricular tachycardia, 58 to 69% for the return of atrioventricular node , 15 ~ 30% of the return of atrioventricular (recessive or dominant pre-excitation). A large number of clinical electrophysiological studies revealed that atrioventricular nodal reentrant tachycardia (AVNRT) is closely related to the dual-pathway (DAVNP) in the atrioventricular node, which is considered as the pathological cause of reentry