The past decade has witnessed a dramatic shift in our approach to the management of atrial fibrillation (AF).1 This can largely be attributed to the advent of catheter ablation therapy which has proven to be significantly more efficacious in achieving arrhythmia control than antiarrhythmic drugs. [2][3][4] However, despite these developments, there is paucity of data on the natural history of this arrhythmia and studies that have been conducted so far to evaluate this aspect of AF behavior, are mostly retrospective.5-7 Thus, there is a growing need to assess AF progression on a prospective basis.In response to this emerging need, Pappone et al report on the natural history of arrhythmia progression in a heterogeneous population of patients presenting with the first episode of AF that were prospectively followed for 5 years.8 Although this was an observational study, the prospective design ensured exclusion of subjects where AF was attributable to a reversible etiology. Thus over a 6 month period, 402 patients were screened of which, 106 were selected for participation. For the next 5-years, enrolled subjects were followed by multiple clinic visits, holter monitors and transthoracic echocardiograms (at 1, 3, 6 months and then annually) as well as trans-telephonic monitors which the patients were required to transmit from 5 days a week for the study duration. Additionally, all patients underwent transesophageal echocardiogram (TEE) at baseline and these were repeated annually in the subgroup of patients who had comorbidities.The initial AF episode was not treated in any consistent way. However, for subsequent recurrences, antiarrhythmic drug (AAD) therapy was initiated with class IC and / or class III agents. Patients that failed and / or were intolerant to AADs were offered catheter ablation. The primary study end-point was assessment of long-term AF progression. Thus over the 5-year follow-up period, almost half the patients (n=50) maintained sinus rhythm without any intervention. In the remaining 56 subjects that experienced AF recurrence, 11 patients were treated with catheter ablation and the rest (45 subjects) with AADs. In the latter group, AF remained paroxysmal in 21 and became persistent in 24 (16 of these progressed to a permanent stage). Patients demonstrating AF recurrence and / or AF progression were older and had more co-morbidities especially diabetes and heart failure. Other interesting observations included 19% incidence of silent AF and occurrence of cardiovascular / cerebrovascular events exclusively in patients with more established forms of AF.