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目的：探讨房室结折返性心动过速(AVNRT)射频电消融(RFCA)术后复发原因。方法：对202例AVNRT患者RFCA术后进行随访，回顾性分析其电生理资料。结果：202例中12例复发，复发率5.9%。复发组7例(58.3%)、非复发组18例(9.5%)靶点数＜3，复发组9例(75.0%)、非复发组17例(8.9%)慢径残存，两组比较均差异有非常显著性意义(P＜0.01)，复发组2例有明显的慢电位未加消融。结论：消融靶点数＜3及慢径残存、慢电位靶点处未加消融是RFCA治疗AVNRT术后复发的主要原因。“,”Objective:To analysis the factors that were associated with therecurrence of atrioventricular nodal reentrant tachycardia (AVNRT) after selective radiofrequency catheter ablation (RFCA) on the slow pathway. Method:Two hundred and two consecutive patients with AVNRT after radiofrequency of atrioventricular node modification were followed up and their electrophysiologic data were retrospectively investigatd. Result: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%.Dual atrioventricular nodal pathway still presented after RFCA in 75% patients of recurrence group. Whereas it was 8.9% in no recurrence group with significant difference presented between the two group (P＜0.01). Two patients with slow potential recurred in recurrence group, patients whose targets ablated less than 3, were 58.3% in recurrence group, whereas they were 9.5% in norecurrence group. There was a higher recurrent rate in patients whose targets less than 3 than in those whose targets more than 3 (P＜0.01).The AVNRT soon recurred in 2 patients, who had significant slow potential that was not ablated. Conclusion:①In order to eliminate the conduction of slow pathway, ablation must be conducted at least 3 sites. ②Slow potential expresses activity of slow pathway and ablation on slow potential is necessary. ③The physiology of dual pathway of atrioventricular node can not exists.