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目的 探讨不同X线投照体位下消融改良慢径治疗房室结折返性心动过速(AVN-RT)的疗效.方法 AVNRT患者126例,按X线投照体位分后前位组40例、右前斜(30度)位组44例和左前斜(45度)位组42例;均经导管标测消融改良慢径.结果 三组均100%成功消融改良慢径.希氏束(His)至冠状窦(CS)口距离、首获有效靶点时间、消融点数、累积放电时间和总X线时间三组间差异均无统计学意义(P>0.05).三组术中发生一过性房窒传导阻滞(AVB)各1例.随访3～6个月无一例复发.结论 经导管消融改良慢径,三种X线投照体位标测均可行、有效.“,”Objective To investigate the efficiency of slow pathway ablation at different X-radiation angles in treating atrioventricular node reentrant tachycardia (AVNRT).Methods Slow pathway ablation was performed with different X-radiation angles of posterior anterior(group PA, 40 cases) , right anterior oblique(group RA0,44 cases) and left anterior oblique(group LAO, 42 cases) by the longest distance between the tip of His and the ostium of CS Results Hundred percent of success was obtained in three groups.There were no significant differences in the longest distance between the tip of His and the ostium of CS, the time of acquireing first effective target, total ablation sites,accumulative ablation time, transient atrioventricular block and total X-radiation time Transient atrioventricular block occurred in one case of each group.No relapsed case was seen during follow up period of 3-6 months.Conclusion The three X-radiation angles are all effective and feasible