Nakatani Y, et al. - Researchers assessed the impact of left atrial wall thickness on the outcome of catheter ablation for atrial fibrillation (AF). AF patients (including those with paroxysmal and persistent AF) who underwent ablation were evaluated for the wall thickness of 16 areas in the pulmonary vein antrum (PVWT) and 19 areas in the left atrial body (LAWT). Heterogeneity in the left atrial wall thickness was evaluated by calculating coefficient of variation of wall thickness (CV-WT). They found that in the AF recurrent group vs in the AF-free group, higher maximum PVWT, mean PVWT, maximum LAWT, and CV-WT were detected in patients with paroxysmal AF, and these findings were the same for patients with persistent AF, with the addition of higher mean LAWT as well. Findings demonstrated that in the recurrence of AF following ablation, a contributory role of thick and heterogeneous left atrial wall was found.