Isolation of an arrhythmogenic roof vein with the guide of a circular mapping catheter in a case with paroxysmal atrial fibrillation

2214-0271 B 2016 Heart Rhythm Society. Published by Elsevier Inc. This is an o (http://creativecommons.org/licenses/by-nc-nd/4.0/). of the left atrium (LA) from the right upper lung lobe (roof vein, Figure 1A, B). After reisolation of reconducted PVs (left superior, right superior, and left inferior PVs) and completion of making a roof line (posteriorly to the roof vein), a Lasso catheter (measuring 15 mm in diameter) was placed inside the roof vein (Figure 1B), which showed both passively activated circumferential potentials and nonconducted blocked firings (Figure 2A). Frequent short-coupling atrial premature complexes with conduction to the LA were also documented. A single radiofrequency (RF) energy application (23W) with an irrigation system at the earliest activation site successfully eliminated the circumferential potentials at the ostium of the roof vein (Figure 2B). During 5 months of follow-up, the patient has been free from atrial fibrillation recurrence.