Atrial fibrillation is a major health problem, and the results of clinical trials of drug therapy to control cardiac rhythm (i.e., long-term medication to prevent atrial fibrillation episodes while maintaining normal sinus rhythm) have been disappointing, with patients eventually abandoning drug therapy either because it fails or because they cannot tolerate the side effects (e.g., amiodarone). The radiofrequency catheter ablation based on double pulmonary vein isolation is currently seen as the most effective way to maintain sinus rhythm, and current guidelines recommend that catheter ablation is reasonable even for primary paroxysmal AF. Catheter ablation of atrial fibrillation requires a high level of operator and hardware requirements, and a 3-D scaler system such as CARTO or Ensite 3000 is a must, so patients are advised to choose a large cardiac center with excellent hardware for the procedure.