Introduction: Catheter ablation (CA) for cure of atrioventricular (AV) nodal reentrant tachycardia (AVNRT) has been established; electrophysiologic slow pathway potential mapping or the anatomic approach within the triangle of Koch has been performed. These slow pathway ablation techniques have a high success rate. In this study, we would like to report an ablation technique of AVNRT; targeting a slightly low region from His bundle potential recording area.
Subjects and methods: From December 2009 to July 2011, we performed CA of AVNRT in 14 cases with using CARTO system. 8 patients were male. The mean age was 57 years old. 12 cases had slow/fast AVNRT, and one had fast/slow AVNRT. His bundle potential recording area was marked in a figure of CARTO system. We targeted the region where was a little bit lower from lowest area of His bundle potential recording.
Results: All cases presented junctional rhythm during CA. Loss of dual AV nodal physiology was achieved in 12 cases. 2 cases still had dual AV nodal pathology with a single-echo beat.
Conclusions: The ablation of AVNRT; targeting a slightly low region from His bundle potential recording area, was also useful to eliminate slow pathway of AVNRT.