title: Mitral regurgitation associated with mitral annular dilation in patients with lone atrial fibrillation: an echocardiographic study.
abstract: BACKGROUND
  Whether and how lone atrial fibrillation (AF) is associated with functional mitral regurgitation (MR) remain unclear.
  
  
  METHODS
  We studied 12 lone AF patients without left ventricular (LV) dysfunction and/or dilatation, who underwent mitral valve annuloplasty for functional mitral regurgitation (MR). Ten lone AF patients without MR served as controls.
  
  
  RESULTS
  Lone AF Patients with MR had a greater mitral valve annular area and left atrial area than those without MR. There were no differences in LV volumes or LV ejection fraction.
  
  
  CONCLUSIONS
  Therefore, we concluded that left atrial dilation and corresponding mitral annular dilation may cause MR in lone AF patients without LV dysfunction and/or dilatation.
authors: Department of Cardiovascular Medicine, The Cleveland Clinic, Cleveland, Ohio 90048, USA. shiotat@cshs.org
authors: Takashi
authors: T
authors: Kihara
authors: A Marc
authors: AM
authors: Gillinov
authors: Kunitsugu
authors: K
authors: Takasaki
authors: Shota
authors: S
authors: Fukuda
authors: Jong-Min
authors: JM
authors: Song
authors: Maiko
authors: M
authors: Shiota
authors: Takahiro
authors: T
authors: Shiota
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000150:complications* / Q000000981:diagnostic imaging*; D004108:Dilatation, Pathologic / Q000000981:diagnostic imaging; D004452:Echocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000150:complications* / Q000000981:diagnostic imaging*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity