Change in type of AF from baseline to 1 year. Red arrows and numbers represent patients with AF progression and grey arrows and numbers represent patients without AF progression. ^aIncrease in AF burden was defined according to the AF progression definition: a doubling in AF burden at one year with at least an AF burden of 10%. ^bAll patients with persistent AF underwent a cardioversion at baseline. AF, atrial fibrillation; LA, left atrium; NT-proBNP, N-terminal pro-B-type natriuretic peptide; PAI-1, plasminogen activator inhibitor.