目的　探讨房室结功能曲线连续性房室结折返性心动过速 (AVNRT)患者的射频消融终点。方法　在AVNRT患者中 ,对心房 A1 A2 和 A1 A2 A3程序刺激房室结功能曲线均呈连续性者为 组 ,A1 A2 刺激房室结功能曲线呈连续性而 A1 A2 A3刺激呈不连续性者为 a组 ,房室结功能曲线均呈不连续性者为 b组。行慢径区域消融后 ,对组间的电生理参数进行比较。结果　 组非典型 AVNRT的诱发率高于 组 (2 7.3 % vs5 .6% ,P<0 .0 5 )。在 I组和 a组 ,消融后最长 A2 H2 间期 (A2 H2 m ax)均比消融前有所缩短 ,但无显著性差异 (P>0 .0 5 ) ,而 b组则显著缩短 (3 76± 73 ms vs2 0 6± 5 6ms,P<0 .0 1)。消融后 组、 a组和 b组的最长 A3H3间期 (A3H3m ax)均比消融前显著缩短 (2 74± 71ms vs 196± 45 ms,P<0 .0 5 ;3 62± 91m s vs 2 2 6± 72 m s,P<0 .0 1;3 85± 88ms vs 2 19± 61ms,P<0 .0 1)。结论　非典型 AVNRT与房室结功能曲线的连续性有关。对于房室结功能曲线连续性的 AVNRT患者 ,消融后 A3H3max的缩短可作为消融终点的指标之一 Objective To investigate the end point of radiofrequency ablation in patients with atrioventricular nodal curve with atrioventricular nodal reentrant tachycardia (AVNRT). Methods In patients with AVNRT, the function curves of atrial and ventricular node stimulated by atrial A1 A2 and A1 A2 A3 were continuous. The functional curve of atrioventricular node was continuous with A1 A2 and discontinuous with A1 A2 A3 For a group, atrioventricular node function curves were discontinuous were b group. After ablation of the slow pathway, the electrophysiological parameters among the groups were compared. Results The induction rate of atypical AVNRT was higher than that of the control group (7.3% vs 5.6%, P <0.05). In group I and group a, the maximum A2 H2 m ax after ablation was shorter than that before ablation, but there was no significant difference (P> 0.05), while the group b was significantly shortened 3 76 ± 73 ms vs 2 0 6 ± 5 6 ms, P <0 01). After ablation, the longest A3H3 interval (A3H3m ax) in group a and group b was significantly shorter than that before ablation (2 74 ± 71 ms vs 196 ± 45 ms, P <0.05; 32 62 ± 91 m s vs 2 26 ± 72 ms, P <0.01; 3 85 ± 88 ms vs 2 19 ± 61 ms, P <0.01). Conclusions Atypical AVNRT is related to the continuity of AV node function curve. For AVNRT patients with continuity of atrioventricular nodal function curve, shortening of A3H3max after ablation may be used as one of the indicators of ablation end point