title: Radiofrequency ablation of atrial arrhythmias after previous open-heart surgery.
abstract: OBJECTIVE
  To report the results of ablation of atrial arrhythmias (AA) after previous open-heart surgery.
  
  
  METHODS
  Nineteen patients [50+/-11 years, 11 women] underwent ablation of symptomatic AAs after previous open-heart surgery. In 11 patients mapping was performed using conventional multielectrode catheters. In the other eight patients CARTO electro-anatomical mapping system was used to supplement conventional mapping.
  
  
  RESULTS
  After conventional mapping, 10/11 patients (91%) were found to have typical atrial flutter (AFL). The cavotricuspid isthmus was successfully ablated in these 10 patients. CARTO combined with conventional mapping showed that 7 of 8 patients had one macro-reentry right atrial circuit. The remaining patient had two focal atrial tachycardias. CARTO-guided ablation was successful in all eight patients (100%). After follow-up of 12+/-11 months, 2/18 patients (11%) had recurrence of either the same (n=1) or a new (n=1) AA.
  
  
  CONCLUSIONS
  AAs after previous open-heart surgery can be ablated successfully (>90%) with a low recurrence rate (11%) at 1-year follow-up. Typical AFL was found frequently (14/19 patients, 72%). This could be ablated successfully, often, after conventional mapping alone. CARTO helps to uncover peri-scar reentry and guide the ablation by creating a line of block connecting the scar to another landmark (unconventional isthmus).
authors.affiliation: Department of Cardiology, Cardiovascular Research Institute Maastricht, Academic Hospital Maastricht, P.Debyelaan 25, 6202 AZ, Post box 5800, Maastricht, Limburg, The Netherlands. ashish_nabar@hotmail.com
authors.forename: A
authors.initials: A
authors.lastname: Nabar
authors.forename: C
authors.initials: C
authors.lastname: Timmermans
authors.forename: A
authors.initials: A
authors.lastname: Medeiros
authors.forename: K
authors.initials: K
authors.lastname: Polymeropoulos
authors.forename: K
authors.initials: K
authors.lastname: Polymeropoulous
authors.forename: H J G M
authors.initials: HJ
authors.lastname: Crijns
authors.forename: L M
authors.initials: LM
authors.lastname: Rodriguez
mesh_terms: D001282:Atrial Flutter / Q000601:surgery*; D006348:Cardiac Surgical Procedures; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies