title: Impact of Voltage Mapping to Guide Whether to Perform Ablation of the Posterior Wall in Patients With Persistent Atrial Fibrillation.
abstract: BACKGROUND
  Fibrosis as a substrate for atrial fibrillation (AF) has been shown in numerous preclinical models. Voltage mapping enables in vivo assessment of scar in the left atrium (LA), which can be targeted with catheter ablation.
  
  
  OBJECTIVE
  We hypothesized that using the presence or absence of low voltage to guide ablation beyond pulmonary vein antral isolation (PVAI) will improve atrial arrhythmia (AF/AT)-free survival in persistent AF.
  
  
  RESULTS
  Single-center retrospective analysis of 2 AF ablation strategies: (1) standard ablation (SA) versus (2) voltage-guided ablation (VGA). PVAI was performed in both groups. With SA, additional lesions beyond PVAI were performed at the discretion of the operator. With VGA, additional lesions to isolate the LA posterior wall were performed if voltage mapping of this region in sinus rhythm showed scar (LA voltage < 0.5 mV). AF-/AT-free endpoint was defined as no sustained AF/AT seen off antiarrhythmic medications after a 2-month postablation blanking period. Seventy-six patients underwent SA and 65 underwent VGA. Patients were well matched for comorbidities, LVEF, and left atrial size. Posterior wall ablation was performed in 57% of patient with SA compared to 42% with VGA. VGA ablation increased 1-year AF-/AT-free survival in patients when compared to SA (80% vs. 57%; P = 0.005). In a multivariate analysis, VGA was the only independent predictor of AF-/AT-free survival (hazard ratio of 0.30; P = 0.002).
  
  
  CONCLUSIONS
  The presence of LA posterior wall scar may be an important ablation target in persistent AF. A prospective randomized trial is needed to confirm these data.
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Cutler
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Johnson
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Khalid
authors.initials: K
authors.lastname: Abozguia
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Shane
authors.initials: S
authors.lastname: Rowan
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: William
authors.initials: W
authors.lastname: Lewis
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Otto
authors.initials: O
authors.lastname: Costantini
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.|Texas Cardiac Arrhythmia Institute, Austin, Texas, USA.
authors.forename: Andrea
authors.initials: A
authors.lastname: Natale
authors.affiliation: Heart and Vascular Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Ohad
authors.initials: O
authors.lastname: Ziv
mesh_terms: D000200:Action Potentials; D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery*; D016279:Atrial Function, Left; D017115:Catheter Ablation; D016009:Chi-Square Distribution; D018572:Disease-Free Survival; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D005355:Fibrosis; D006325:Heart Atria / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D006329:Heart Conduction System / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D006339:Heart Rate; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D018579:Patient Selection; D011237:Predictive Value of Tests; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome
keywords: atrial fibrillation; atrial scar; catheter ablation; pulmonary vein isolation; substrate mapping; voltage mapping