The overall success rate, which included patients who continued to take antiarrhythmic drugs, was 80% in the second survey vs. The success rate was 70% without antiarrhythmic drugs vs. The second worldwide multicenter survey, on catheter ablations performed from 2003–2006, was subsequently published and showed an improvement in treatment success. Success rates were highest in high-volume centers. Achieving this success required a second procedure for 24.3%, and a third procedure for 3.1%. For many, those drugs did not work prior to the ablation. An additional 23.9% were successful but were on antiarrhythmic drugs. It indicated that 52% of patients having an atrial fibrillation catheter ablation were successful and symptom-free without antiarrhythmic drugs. In 2005, the first worldwide multicenter survey on catheter ablation was published using data from 181 centers from 1995–2002. 1 Outcomes varied based on differences in technique, experience, skill, and follow-up. For multiple procedures, the majority reported success rates of 70% or more for paroxysmal atrial fibrillation and 50% or more for persistent atrial fibrillation. In early studies, the majority of centers reported single procedure success rates of 60% or more for paroxysmal atrial fibrillation and 30% or less for persistent atrial fibrillation. Catheter ablation success rates have improved over time based on a better understanding of atrial fibrillation, new techniques and technology, and greater doctor experience.
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