title: Predictive factors for persistence of atrial fibrillation after mitral valve operation.
abstract: BACKGROUND
  The majority of patients operated on for mitral valve disease with chronic atrial fibrillation (AF) do not recover sinus rhythm with conventional postoperative treatment. The maze procedure may be used in these circumstances. To define the precise indications for the maze procedure, it would be necessary to identify those patients based on preoperative factors.
  
  
  METHODS
  A retrospective study was undertaken on 100 consecutive patients operated on for mitral valve disease in chronic AF. The return to sinus rhythm was analyzed with relation to age, gender, AF duration, left atrial size, left ventricular ejection fraction, lesion type, valve procedure, associated procedures, and reoperation.
  
  
  RESULTS
  At late follow-up (more than 1 year) 26 (26%) patients presented sinus rhythm and 74 (74%) remained in AF. Statistical single parametric analysis demonstrated that mitral stenosis was a risk factor for maintaining AF, whereas regurgitation was more associated to sinus rhythm recovery. There was no relation with the other parameters with return to sinus rhythm. It should be noted, however, that 96% of this series had AF for more than 6 months preoperatively.
  
  
  CONCLUSIONS
  The majority of patients with mitral valve disease remain in AF and this may justify the association of maze procedure. Pure regurgitation may be a single predictor for return to sinus rhythm after mitral valve operation in chronic AF.
authors.affiliation: Instituto de Cardiologia do Rio Grande do Sul, Fundação Universitária de Cardiologia, Porto Alegre, Brazil.
authors.forename: R A
authors.initials: RA
authors.lastname: Kalil
authors.forename: C B
authors.initials: CB
authors.lastname: Maratia
authors.forename: A
authors.initials: A
authors.lastname: D'Avila
authors.forename: F B
authors.initials: FB
authors.lastname: Ludwig
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000209:etiology*; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D008946:Mitral Valve Stenosis / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D012189:Retrospective Studies; D012307:Risk Factors