Paused presentation of a Coherent map of the PVA in LAO view from below (from the IB) in a patient after Senning procedure for d-transposition of the great arteries. (A) CM of the tachycardia showed an intraatrial re-entrant tachycardia around the TV with a critical isthmus between the IVC/IB and the TV (CTI). Thicker arrows indicate areas with low conduction velocity (white asterisk). (B) After creation of a CTI-ablation line, tachycardia could not be terminated, so a remap was performed, showing a continued slow conduction (thick arrows) through the SNO-Zone of the CTI-ablation line. (C) After closing the gaps and termination of AT, the remap during atrial pacing near to CS ostium showed a completed SNO-Zone and CM showed no remaining conduction through the CTI-ablation line. AT, atrial tachycardias; CM, Coherent mapping; CTI, cavotricuspid isthmus; IVC/IB, inferior vena cava/inferior baffle; MV, mitral valve; P, PENTARAY™ catheter; PVA, pulmonary venous atrium; RUPV, right upper pulmonary vein; SNO, area of slow or no conduction; SVA, systemic venous atrium; TV, tricuspid valve. See also Supplementary material online, Videos S1–S3.