Figure1: A: Baseline 12-lead electrocardiography demonstrated tachycardia with a negative P wave morphology in I and aVL, positive P wave morphology in inferior leads and positive P wave in V1 derivation. B: The coronary sinus mapping revealed a distal-to-proximal atrial activation sequence during the AT.Figure1C: Ultra-high resolution mapping (Rhythmia™) showed the earliest activation to be in the distal portion of LAA stump from the view of AP.Figure3: Angiographic of the LAA stump imaging at RAO 30°.