title: Atrial Fibrillation Ablation Guided by a Novel Nonfluoroscopic Navigation System.
abstract: OBJECTIVE
  Rhythmia is a new nonfluoroscopic navigation system that is able to create high-density electroanatomic maps. The aim of this study was to describe the acute outcomes of atrial fibrillation (AF) ablation guided by this system, to analyze the volume provided by its electroanatomic map, and to describe its ability to locate pulmonary vein (PV) reconnection gaps in redo procedures.
  
  
  METHODS
  This observational study included 62 patients who underwent AF ablation with Rhythmia compared with a retrospective cohort who underwent AF ablation with a conventional nonfluoroscopic navigation system (Ensite Velocity).
  
  
  RESULTS
  The number of surface electrograms per map was significantly higher in Rhythmia procedures (12 125 ± 2826 vs 133 ± 21 with Velocity; P < .001), with no significant differences in the total procedure time. The Orion catheter was placed for mapping in 99.5% of PV (95.61% in the control group with a conventional circular mapping catheter; P = .04). There were no significant differences in the percentage of PV isolation between the 2 groups. In redo procedures, an ablation gap could be identified on the activation map in 67% of the reconnected PV (40% in the control group; P = .042). The measured left atrial volume was lower than that calculated by computed tomography (109.3 v 15.2 and 129.9 ± 13.2 mL, respectively; P < .001). There were no significant differences in the number of complications.
  
  
  CONCLUSIONS
  The Rhythmia system is effective for AF ablation procedures, with procedure times and safety profiles similar to conventional nonfluoroscopic navigation systems. In redo procedures, it appears to be more effective in identifying reconnected PV conduction gaps.
authors.affiliation: Departamento de Cardiología y Cirugía Cardiaca, Clínica Universidad de Navarra, Pamplona, Navarra, Spain.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Ballesteros
authors.affiliation: Departamento de Cardiología y Cirugía Cardiaca, Clínica Universidad de Navarra, Pamplona, Navarra, Spain.
authors.forename: Pablo
authors.initials: P
authors.lastname: Ramos
authors.affiliation: Departamento de Cardiología y Cirugía Cardiaca, Clínica Universidad de Navarra, Pamplona, Navarra, Spain.
authors.forename: Renzo
authors.initials: R
authors.lastname: Neglia
authors.affiliation: Departamento de Cardiología y Cirugía Cardiaca, Clínica Universidad de Navarra, Pamplona, Navarra, Spain.
authors.forename: Diego
authors.initials: D
authors.lastname: Menéndez
authors.affiliation: Departamento de Cardiología y Cirugía Cardiaca, Clínica Universidad de Navarra, Pamplona, Navarra, Spain. Electronic address: igarciab@unav.es.
authors.forename: Ignacio
authors.initials: I
authors.lastname: García-Bolao
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000601:surgery*; D017115:Catheter Ablation / Q000295:instrumentation* / Q000379:methods; D015331:Cohort Studies; D004562:Electrocardiography / Q000379:methods; D005260:Female; D005471:Fluoroscopy; D006325:Heart Atria / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D061646:Operative Time; D009929:Organ Size; D011667:Pulmonary Veins / Q000601:surgery*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
keywords: Ablación de fibrilación auricular; Aislamiento de venas pulmonares; Atrial fibrillation ablation; Catéter Orion; High-density electroanatomic mapping; Mapeo electroanatómico de alta densidad; Orion catheter; Pulmonary vein isolation; Rhythmia Mapping System