4.1 Patients
Study flow of this study is shown in Figure 1. A total of 3,120 patients underwent de-novo RFCA for AF from June 1998 to April 2019 in our institution. Mean age was 55.74 ± 10.96 years and 78.9% were male. The mean CHA2DS2-VASc score was 1.27 ± 1.26. Non-paroxysmal AF was observed in 1,277 (40.9%) patients. Baseline demographics of our cohort are described in detail in our previous studies.18, 20 Among 3,120 patients, 360 patients had both pre- and post-RFCA VENC-MRI evaluation. Baseline characteristics of these 360 patients with VENC-MRI are described in Table 1. Mean age was 57.31 ± 11.16 years old and 77.2% were male. Mean body mass index was 25.03 ± 2.92 which is significantly lower compared with RFCA cohorts of western countries. Atrial fibrillation was non-paroxysmal in 174 (48.3%) patients and mean CHA2DS2-VASc score was 1.40 ± 1.27.