Electrophysiological evidence of localized reentry as a trigger and driver of atrial fibrillation at the junction of the superior vena cava and right atrium

Abstract

Localized reentry is one of the major sources maintaining organized atrial fibrillation (AF)1 and atrial tachycardia (AT).2, 3 The electrical activity circulating around a small area is usually represented by a temporal gradient of the activation between the distal and proximal bipoles of the ablation catheter.1 We present a case of a patient in whom the electrophysiological findings proved a temporal gradient of the activation at the junction of the superior vena cava (SVC) and right atrium (RA) as a localized reentry.