The upper pulmonary veins (PVs) are responsible for the majority of atrial fibrillation (AF) triggering foci, whereas the inferior PVs are more difficult to ablate and prone to postablation ostial ...

4. Electrogram recordings in a patient with a focal pulmonary vein (PV) tachycardia originating from the right upper PV (RUPV). The fluoroscopic image (left anterior oblique projection ...