3D electroanatomical mapping is less sensitive to atrial remodeling in estimation of true left atrial volume than echocardiography

Left atrial (LA) enlargement has been identified as a predictor of worse clinical outcome after catheter ablation for atrial fibrillation (AF). We investigated the correspondence of LA size parameters assessed by echocardiography, CT and 3D electroanatomical mapping in patients with AF treated by catheter ablation. We analyzed echocardiographic LA volume measurements by disc summation method (LAV ), computed tomography (LAV ) and 3D electroanatomical mapping (LAV ) in 100 pts. (71% males; aged 63 ± 8 years; paroxysmal AF in 55% of patients). Mean LAV was 83 ± 25 ml (median: 115; IQR: 98-140 ml), mean LAV was 120 ± 34 ml (median: 115; IQR: 98-140 ml) and mean LAV was 123 ± 36 ml (median: 118; IQR: 99-132 ml). Pearson's correlation coefficient between LAV a LAV was 0.6 (p