LAUSR

Introduction Atrial fibrillation ablation is an increasingly frequent procedure performed in the electrophysiology laboratory. Pulmonary vein foci account for more than 90% of triggers for atrial fibrillation, most commonly treated with complete pulmonary vein isolation most of the time. Non–pulmonary vein triggers are the drivers of atrial fibrillation in a subgroup of patients. This patient had an atrial tachycardia originating from a persistent left superior vena cava (SVC).