Legends
Figure 1. 3-D anatomical compartmentalization of the LA into seven segments in antero-posterior (A) and postero-anterior (B) views: (1) left PV‐LA junction; (2) right PV‐LA junction; (3) roof; (4) posterior; (5) inferior; (6) anterior (including LA appendage); and (7) left septum. EAM: electroanatomical; LA: atrium; LAA: left atrial appendage; LIPV: left inferior pulmonary vein; LSPV: left superior pulmonary vein; RIPV: right inferior pulmonary vein; RSPV: right superior pulmonary vein; PV: pulmonary vein.
Figure 2. A1-A2: High-density EAM demonstrating severe LA fibrotic disease (extensive low bipolar voltage areas) in a patient with HCM, persistent AF and arrhythmia recurrence following catheter ablation as detected using either the ≤0.25 mV low voltage criterion (A1) or the ≤0.4 mV low voltage criterion (A2). B1-B2:High-density EAM in a patient with HCM, paroxysmal AF and sinus rhythm maintenance following catheter ablation showing minimal left atrial disease as detected using the ≤0.25 mV low voltage criterion (B1) and mild (wider low voltage areas) using the ≤0.4 mV low voltage criterion (B2). AF: atrial fibrillation; EAM: electroanatomical mapping; HCM: hypertrophic cardiomyopathy; LA: left atrium.