title: Combined dominant frequency and complex fractionated atrial electrogram ablation after circumferential pulmonary vein isolation of atrial fibrillation.
abstract: BACKGROUND
  Atrial substrates with high-dominant frequency (DF) and complex fractionated atrial electrogram (CFAE) sites have sources maintaining atrial fibrillation (AF) and are potential AF ablation targets. This study aimed to evaluate an approach of circumferential pulmonary vein isolation (PVI) followed by a DF and CFAE site ablation.
  
  
  RESULTS
  Fifty consecutive AF patients (23 paroxysmal, 9 persistent, and 18 longstanding persistent) underwent ablation, using NavX. When AF continued after circumferential PVI, high-DF sites of ≥ 8 Hz and then continuous left atrial (LA) CFAE sites defined by fractionated intervals (FI) of ≤50 milliseconds including the coronary sinus and right atrium were targeted. A total of 45.1% of high-DF and 48.1% of continuous CFAE sites significantly decreased after PVI (P < 0.001). The mean LA DF and FI significantly decreased and prolonged, respectively, after PVI (P < 0.001). Only 14.1% of all high-DF sites after PVI overlapped with continuous CFAE sites. AF terminated at high-DF sites in 11 (22%) patients and continuous CFAE sites in 1 (2%). AF could be induced in only 8% of patients after the procedure. The mean LA DF value before ablation was significantly lower in those without recurrence (P = 0.003). AF freedom on antiarrhythmic drugs was 96% and 59%, respectively, in the paroxysmal and nonparoxysmal AF patients (89% persistent and 44% longstanding persistent) after 1 procedure over a 12-month follow-up.
  
  
  CONCLUSIONS
  A combined high-DF and continuous CFAE site ablation in all chambers after circumferential PVI may be effective in the paroxysmal and persistent AF patients.
authors.affiliation: Division of Cardiology, Gunma Prefectural Cardiovascular Center, Maebashi, Gunma, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Kumagai
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Sakamoto
authors.forename: Keijiro
authors.initials: K
authors.lastname: Nakamura
authors.forename: Suguru
authors.initials: S
authors.lastname: Nishiuchi
authors.forename: Mamoru
authors.initials: M
authors.lastname: Hayano
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Hayashi
authors.forename: Takehito
authors.initials: T
authors.lastname: Sasaki
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Aonuma
authors.forename: Shigeru
authors.initials: S
authors.lastname: Oshima
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis* / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D022062:Electrophysiologic Techniques, Cardiac / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011667:Pulmonary Veins / Q000601:surgery*
keywords: atrial fibrillation; catheter ablation; complex fractionated atrial electrograms; dominant frequency; pulmonary vein isolation