Follow-up. Patients will be prospectively assessed for recurrence of AF or other atrial arrhythmia. As part of our routine AF ablation protocol, all patients are receiving beta blockers, whereas all patients are kept on amiodarone and warfarin for 3 months post-ablation. Patients will be subjected to monthly clinical assessment and ambulatory electrocardiographic monitoring for 2 years. All patients are instructed to maintain personal records with descriptions of every episode of symptomatic palpitations and, in case of persistent arrhythmia episodes, to obtain trans-telephonic or electrocardiographic documentation of the underlying rhythm. Patients will be encouraged to use trans-telephonic monitoring even when their symptoms are not typical for recurrent AF. A successful outcome over the follow-up period is defined as the lack of electrocardiographically recorded AF, and no AF or other atrial arrhythmia on Holter, and subjective symptomatic improvement after a 3-month blanking period.