STUDY OF RECURRENCE OF ATRIOVENTRICULAR NODAL REENTRANT TACHYCARDIA AFTER RADIOFREQUENCY CATHETER ABLATION

Objective:To determine the relationship between the slow pathway and the recurrence of atrioventricular nodal reentrant tachycardia (AVNRT) after radiofrequency catheter ablation (RFCA).Methods:202 consecutive patients with AVNRT after radiofrequency atrioventricular node modification were followed up and their electrophysiologic datas were retrospectively investigated.Results:Clinical recurrence of AVNRT was documented in 12 patients (recurrence group) from 202 patients and no recurrence in 190 patients (no recurrence group),the recurrent rate was 5.9%,9(75.0%) patients with dual atrioventricular nodal pathway (DAVNP)in recurrence group,17(8.9%) patients in no recurrence group,There was significant difference between the two groups (P0.01).After RFCA procedure,176 patients had neither dual atrioventricular nodal pathway (DAVNP) nor junctional echos (group A),23 patients had DAVNP without a juctional echo (group B),3 patients had both DAVNP and junctional echos (group C),the recurrent rate was 1.8%(3/176),26.1%(6/23),100.0%(3/3) respectively.Significant difference presented among the 3 groups.Conclusions:In order to avoid recurrence of AVNRT,after RFCA,the physiology of dual pathway and junctional echos must be no longer persistent.