Fig. 1

Peri-procedural stratification of the study cohort. Flow chart illustrating the peri-procedural stratification of the study population forming three subgroups considered during the post-interventional follow-up period. Two patients with a non-successful revascularization attempt of a single pulmonary vein (PV) occlusion did not undergo post-interventional follow-up cardiovascular magnetic resonance (CMR) examinations corresponding to 2 PVs “stenosis ≥ 70%, revasc (‒)” and 8 PVs “stenosis < 70%”. PV indicates pulmonary vein; revasc, revascularization