title: Approach to the catheter ablation technique of paroxysmal and persistent atrial fibrillation: a meta-analysis of the randomized controlled trials.
abstract: BACKGROUND
  Several randomized controlled trials (RCTs) have been published to investigate the optimal techniques for atrial fibrillation (AF) ablation. Many of these are small in number and include both paroxysmal and persistent AF; however, the techniques for each of these types of AF may differ.
  
  
  RESULTS
  We searched MEDLINE, EMBASE, and the Cochrane Controlled Trials Register for RCTs evaluating AF ablation for either paroxysmal or persistent AF. The primary endpoint was freedom from AF after a single procedure. A total of 35 unique randomized controlled trials were found to fulfill the criteria. A significant degree of heterogeneity was present given the differing sample sizes, populations studied, and outcomes. Radiofrequency ablation (RFA) was found to be favorable in prevention of AF over antiarrhythmic drugs (AADs) in either paroxysmal (5 studies, RR 2.26; 95% CI 1.74, 2.94) or persistent AF (5 studies, RR 3.20; 95% CI 1.29, 8.41). When comparing specific techniques, wide-area PVI appeared to offer the most benefit for both paroxysmal (6 studies, RR 0.78; 95% CI 0.63, 0.97) and persistent AF (3 studies, RR 0.64; 95% CI 0.43, 0.94). CFE ablation provided only benefit for persistent AF when combined with antral PVI (4 studies, RR 0.55; 95% CI 0.34, 0.87).
  
  
  CONCLUSIONS
  Despite significant methodological limitations, it appears that additional ablations beyond PVI are necessary for persistent AF but not proven for paroxysmal AF. The optimal technique for persistent AF, however, deserves a further study, in the setting of a large, randomized controlled trial.
authors.affiliation: Queen Elizabeth II Health Sciences Centre, Halifax, Canada. parkashr@cdha.nshealth.ca
authors.forename: Ratika
authors.initials: R
authors.lastname: Parkash
authors.forename: Anthony S L
authors.initials: AS
authors.lastname: Tang
authors.forename: John L
authors.initials: JL
authors.lastname: Sapp
authors.forename: George
authors.initials: G
authors.lastname: Wells
mesh_terms: D055011:Ablation Techniques / Q000379:methods*; D001281:Atrial Fibrillation / Q000453:epidemiology / Q000503:physiopathology / Q000628:therapy*; D017115:Catheter Ablation / Q000379:methods*; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D016896:Treatment Outcome