Fig. 3

Mapping and ablation of cavotricuspid isthmus-related AFL. Linear ablation was performed at the tricuspid isthmus, and during the ablation, the altered AFL was converted to sinus rhythm (blue dot), Bidirectional conduction block of the CTI was achieved after CTI linear ablation. His bundle potential (yellow dot), and linear ablation along the CTI by the ablation catheter (red dots)