Fig. 5

Electrical and anatomical mapping with guidance of CARTO system. a Endocardial mapping of both ventricles, showed in anterior-posterior position. b Endocardial mapping of both ventricles, showed in posterior–anterior positions. c–d Epicardial mapping indicated that there were obvious low-voltage regions or scars with significant late, double or fragmented potentials, around the tricuspid annulus, in inferior-lateral-apex and inferior-apex walls (c–d), and outflow tract (e) of right ventricle. Line and lamellar ablation was performed across the scars (red points). F, in the mid-septum of endocardium in the right ventricle, the pacing mapping suggested potential targets, as ECG characteristics of pacing similar to that of short episodes of clinical VT. This region was mapped with significant late potentials and ablated (red points)