Figure 3. Activation map and intracardiac electrograms recorded after wide antral circumferential ablation. (A) The activation map with tags indicating ablation sites. A small, blunt prepotential (a yellow arrow) was observed in the point corresponding to the proximal segment of the Bachmann bundle. This point is also indicated by a pink tag in Fig 2A. (B) Intracardiac electrograms with the mapping catheter (MAP) positioned in the right superior pulmonary vein. Abbreviations are as defined in Fig. 2.