Ultra‐high density mapping of intra‐atrial reentrant tachycardia in a patient after a lateral tunnel total cavopulmonary connection

We report a case of an 18‐year‐old male with a postsurgical lateral tunnel (LT) total cavopulmonary connection (TCPC) and supraventricular tachycardia (SVT). Patients after an LT TCPC have complicated suture lines and a considerable area of damaged myocardium in the LT, which could become a complex arrhythmogenic substrate of tachycardias. Detailed three‐dimensional (3D) mapping of the LT and atrium is important for a successful ablation. In this patient, successful catheter ablation of two types of complex tachycardias was accomplished using an ultra‐high density 3D mapping system inside the LT.
Ultra‐high density mapping of intra‐atrial reentrant tachycardia after Fontan operation.