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Catheter ablation for the treatment of atrial fibrillation (AF) has reasonably good short-term success rates, although long-term data are not yet available. The probability of success depends largely on patient characteristics, including AF type (paroxysmal vs. persistent or chronic) and left atrial size. To examine how the degree of atrial fibrosis as identified by delayed enhancement magnetic resonance imaging (MRI) affects the odds of a successful ablation, authors conducted a multicenter, prospective, observational cohort study involving 260 AF patients undergoing their first catheter ablation between August 2010 and August 2011. Before the ablation procedure, the patients underwent delayed enhancement MRI, and fibrosis quantification w…