长PR房室结双径路的电生理特点和射频消融慢径的安全性

目的　探讨窦律时PR已延长 ( >2 0 0ms)的房室结双径路的电生理特点和慢径消融的安全性。方法　观察 11例长PR组患者的电生理特点和射频消融慢径对PR和AH等心内参数的影响 ,并与 3 3例正常PR组对照。结果　长PR组患者无房室结双径路 ,即AH跳跃现象较正常PR组更常见 ,心室刺激较正常PR组更易诱发心动过速。射频消融对两组患者PR和AH无影响。长PR组射频消融后 1:1房室和室房传导的最大频率减慢 ,房室结有效不应期延长。结论　结果提示 ,长PR房室结双径路具有不同于正常PR者的电生理和射频消融特点 ,射频消融慢径对这些患者是安全、有效的。

Electrophysiologic characteristics and result of slow pathway radiofrequency ablation of dual atrioventicular node reentry tachycardia in patients with long PR interval

Objective To assess the electrophysiologic characteristics and the safety of slow pathway radiofrequency ablation of atrioventricular nodal reentry tachycardia in patients with long PR interval in sinus rhythm Methods The long PR group includes 11 patients with prolonged PR over 200 ms, the normal PR group includes 33 patients with normal PR range from 120 140ms The intracardiac parameters of electrophsiological study were compared between the two groups Results No dual atrioventricular nodal pathway in long PR group is more often than the normal PR group The induction of atrioventricular nodal reentry tachycardia by ventricular stimulation is higher in long PR group than in the normal group The PR and AH were unchanged after slow pathway ablation in both groups The ablation was successful in all patients with no complication in the two groups Conclusion The results suggested that dual atrioventricular nodal pathways in patients with long PR have some electrophysiologic characteristics of their own and the radiofrequency ablation of slow pathway is safe and effective in these patients