旁道合并房室结双径路的电生理特征

采用经食管心房起搏和心内电生理检查方法，证实旁道（AP）合并房室给双径路（DAVNP）6例。心房程控起搏经房室结（AVN）前传有跳跃延长现象；诱发阵发性室上性心动过速（PSVT）时，表现为R－R间期长短交替或有两种频率的PSVT，其折返途径均为AVN前传，AP逆传。AP射频消融后，心房程控起搏经AVN仍有跳跃现象传导，但不能诱发PSVT，随访6～24月均无PSVT发作。

The electrophysiological characteristic of the coexistence of dual AVN pathway and accessory pathway

Six Patients with paroxysmal supraventricular tachycardia (PSVT), the coexistence of dual AVN pathway and accessory pathway conduction were verified by transesophgeal atrial pacing (TEAP) and electrophysiological study (EPS ). AVN antegrade conduetion during programmed atrial stimulation had discontinuous manifestation, and PSVT was induced. The manifestatiuns included alternation of tachyeardia eyele lengths and two frepueney tachyeardia. The reeiprocating taechyeardia cireuit consisted of AVN antegrade eonduction and accessory pathway retrograde conduetion. After radiofrequency ablation of the accessory pathway, AVN conduction by programmed atrial stimulation still had diseontinous phenomena, but PSVT couldn' t be induced. There was no episode of tachycardia during follow-up for six months to two years.