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目的:探讨射频电消融(RFCA)术改良房室结治疗房室结折返性心动过速(AVNRT)心内电图特点,以指导其治疗.方法:采用下位法阻断慢通道改良房室结对52例AVNRT患者RFCA消融靶点进行研究.结果:在影像学上,左前斜位有效靶点位于右房室环2~5点之间,其中3点处占58.6％.从临床电生理上分析,有效靶点是小A波、大V波,A波碎裂或有慢电位.慢电位在A波后、希氏束电位前,通常间期短、振幅低.当记录到碎裂心房电位及侵电位,且A/V＜0.25处进行放电消融时,可以减少放电次数和X线照射时间.结论:慢电位及碎裂心房电位作为指导消融的心内电图指标,能提高RFCA术效率.“,”Objective:The fluoroscopic and intracardiac electrographic characters of 52 patientswere researched in order to guide radiofrequency catheter ablation (RFCA) procedure and preventcomplication. Metbod:Method of modificating the slow pathway of atrioventricular node by RFCAwas used.Result:①By fluoroscopic screen in left anterior oblique view,the ablation target was lo-cated in tricuspid annulus,between two to five o\'clock,among them, 58. 6 % in three O\'clock. ②Theintracardiac electrographic characters of effective target of ablation were small fractional A waveand large V wave with slow potential. ③Slow potential (SP) could be recorded in 46.2% patients,and it is located be fore His bundle potential. A-SP duration was (46.l±13.3) ms. It is a wave oflow amplitude and short duration. ④The character of intracardiac ECG in target point is fractionalA wave/slow potential and A/V < 0. 25, thus, it could reduce X ray\'S radiation time and ablationtimes. Conclusion:①In fluoroscopic screen,the ablation target is located in tricuspid annulus be-tween two to five O\'clock in left anterior oblique view. The most common site is located on threeo\'clock. ②The site of small amplitude A wave and large amplitude V wave (A/V<0. 25) withfractional A wave or slow potential is the effective ablation target. ③RFCA is a safe and effectivemethod for curing AVNRT.