Mental Exit Block

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them." — Albert Einstein The pulmonary vein (PV) has been a source of fascination for electrophysiologists ever since the landmark work of Haissaguerre et al. first showed that the PVs were a common source of atrial fibrillation (AF) triggers.1 The distinct embryologic origins of PV tissue were thought to predispose these sites to be repositories of ectopy and thereby AF. Initial therapeutic approaches reliant upon targeting individual pulmonary vein triggers evolved to segmental pulmonary vein isolation, and at present, wide area antral isolation.2-4