Merged view (cardiac MRI and CARTO) from right lateral in a patient with hypoplastic left heart syndrome after TCPC with an extracardial conduit. Access to the PVA (former right atrium) was obtained through puncture of the TCPC-Conduit in the PVA. A decapolar catheter is situated in the LPA. (A) Coherent map of the PVA of the AT showed an FAT with a centrifugal spread with its origin postero-lateral of the atriotomy scar (white asterisk). Ablation at this site led to termination of the FAT. (B) Voltage map of the PVA showed a low-voltage area at the site of the origin of the FAT. AT, atrial tachycardias; FAT, focal atrial tachycardia; LPA, left pulmonary artery; MRI, magnetic resonance imaging; P, PENTARAY™ catheter; PVA, pulmonary venous atrium; RPA, right pulmonary artery; TCPC-Conduit, extracardial total cavopulmonary connection conduit. See also Supplementary material online, Video S4.