Introduction
A previous case report demonstrated inadvertent electrical superior vena cava (SVC) isolation during radiofrequency and cryoballoon application to the right superior pulmonary vein (RSPV) in the acute phase.1-4 However, the long-term impact of RSPV isolation on the right atrial (RA) and SVC junction is undetermined. Here we describe a case of persistent SVC isolation by cryoballoon-based PV isolation. The electroanatomical mapping system clearly visualized the persistent effect of the cryoballoon application to the SVC.