title: Simple left atrial procedure for chronic atrial fibrillation associated with mitral valve disease.
abstract: BACKGROUND
  A computerized 48-channel mapping system was used to investigate the characteristics of an atrial epicardial electrogram during chronic atrial fibrillation (AF) in patients with solitary mitral valve disease. We have devised a simple left atrial procedure to eliminate the chronic AF during a mitral valve operation.
  
  
  METHODS
  Using this mapping system, we performed intraoperative atrial mapping in 11 patients with chronic AF associated with mitral valve disease. The AF duration ranged from 0.4 to 15 years (mean, 8.0 +/- 4.5 years). A simple surgical ablation of the AF on the left atrium only was performed during the mitral valve operations.
  
  
  RESULTS
  The mean AF cycle length of the atria ranged from 129 to 169 milliseconds in the right atrium and from 114 to 139 milliseconds in the left atrium. The mean AF cycle length of the left atrium was shorter than that of the right atrium. Regular and repetitive activation was found in the left atria of 7 of 11 patients. The AF disappeared in all patients immediately after the operation, and 10 of these patients continued to have a sinus rhythm postoperatively (AF-free rate, 91%).
  
  
  CONCLUSIONS
  Computerized intraoperative mapping revealed a shorter mean AF cycle length in the left atrium. A simple left atrial procedure was effective in eliminating chronic AF associated with solitary mitral valve disease.
authors.affiliation: First Department of Surgery, Hiroshima University School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sueda
authors.forename: H
authors.initials: H
authors.lastname: Nagata
authors.forename: H
authors.initials: H
authors.lastname: Shikata
authors.forename: K
authors.initials: K
authors.lastname: Orihashi
authors.forename: S
authors.initials: S
authors.lastname: Morita
authors.forename: M
authors.initials: M
authors.lastname: Sueshiro
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuura
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000209:etiology / Q000503:physiopathology / Q000601:surgery*; D006348:Cardiac Surgical Procedures / Q000379:methods; D002908:Chronic Disease; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000150:complications* / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000150:complications* / Q000601:surgery; D012815:Signal Processing, Computer-Assisted