Dual Chamber map for effective ablation
CARTO system and Ensite system could annotate only atrial or ventricular potentials and are not able to distinguish between atrial and ventricular potentials during the same maps. However, the Rhythmia system has an intelligent annotation technology and annotates the largest bipolar potential, which enables distinguishing the atrial and ventricular potentials all at once and can construct an atrioventricular dual-chamber map without a manual reannotation9. Accessory pathways are located at the atrio-ventricular (AV) annulus and the understanding of the anatomical position of AV annulus is important for ablation of APs. The dual chamber map enables us to understand this important factor before the application of RF energy. Furthermore, the continuous activation pattern of APs from one chamber to another chamber was also useful to the understanding of the site of APs. As a result, the number of radiofrequency applications, radiofrequency time, and energy in the dual chamber map group were significantly lower than the of the single chamber map group.