BOSTON--(BUSINESS WIRE)--In final, one-year results of a multicenter randomized clinical study, catheter ablation demonstrated significantly better outcomes compared to anti-arrhythmic drug (AAD) therapy for the treatment of drug refractory recurrent symptomatic paroxysmal atrial fibrillation. Atrial fibrillation, or AFib as it is more commonly referred to, is the most prevalent cardiac arrhythmia (heart rhythm disorder), affecting an estimated 20 million people worldwide. It is also one of the most common causes of stroke.