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.