AP19-01197 Abstract View

Introduction : Atrial fibrosis works as AF substrate because it causes conduction slowing and action potential duration shortening, which facilitate reentry. Left atrial (LA) area with reduced bipolar voltage identified during sinus rhythm (low voltage zone = LVZ) has been used as a surrogate for atrial fibrosis. LVZ is frequently localized in a specific region such as anterior wall and delayed enhancement MRI studies also show localized fibrosis, suggesting that fibrosis is heterogeneous process. These localized fibrotic regions have been shown to be a possible ablation target for substrate modification. The purpose of this study is to re-evaluate the bipolar voltage map using a newly released HD Grid mapping catheter (Abbott, USA).