3.1 Patients and procedural characteristics
The patients and procedural characteristics are shown in Table 1 . The mean age was 66±12 years, mean left atrial dimension 43±8 mm, and mean left ventricular ejection fraction 60±8%. Ten (67%) out of 15 patients underwent an initial AF catheter ablation. The time from the MRI acquisition to the AF ablation was 95±60 days.