title: Morphological findings in 192 surgically excised native mitral valves.
abstract: BACKGROUND
  Mitral valve disease (MVD) is a significant clinical problem that is becoming more common in the 21st century. The pathogenesis of MVD seems to be changing and is not well understood.
  
  
  METHODS
  The present study details the morphological findings in 192 native mitral valves excised over a one-year period at the Toronto General Hospital, Toronto, Ontario. The mean patient age was 59.7+/-12.3 years at operation.
  
  
  RESULTS
  There were 106 men (55.2%) and 86 women (44.8%) in the present study. The most frequent changes in the surgically excised valvular leaflets were fibrosis (78.6%) and thickening (66.2%). Fusion (32.3%) and calcification (25.2%) were common changes at the commissures. Chordae tendineae most often showed evidence of thickening (47.9%) and fibrosis (37.0%). In total, 110 valves showed mitral incompetence (57.3%), 72 showed mitral stenosis (37.5%), and 10 showed a combination of stenosis and incompetence (5.2%).
  
  
  CONCLUSIONS
  In the present series, MVD was most frequently caused by postinflammatory (rheumatic) valve disease (RVD) (35.9%), followed by myxomatous degeneration (33.3%). Patients with RVD were usually female (66.7%), while those with myxomatous degeneration were more likely to be male (76.6%). RVD remains a significant problem even though the incidence of acute rheumatic fever with cardiac involvement has declined in Canada. This most likely reflects the current sociodemographic composition of the referral population.
authors.affiliation: Toronto General Hospital, Toronto, Canada.
authors.forename: Shaun W
authors.initials: SW
authors.lastname: Leong
authors.forename: Gursharan S
authors.initials: GS
authors.lastname: Soor
authors.forename: Jagdish
authors.initials: J
authors.lastname: Butany
authors.forename: Jessica
authors.initials: J
authors.lastname: Henry
authors.forename: Molly
authors.initials: M
authors.lastname: Thangaroopan
authors.forename: Richard L
authors.initials: RL
authors.lastname: Leask
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002170:Canada; D005260:Female; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000473:pathology* / Q000601:surgery; D008944:Mitral Valve Insufficiency / Q000209:etiology / Q000473:pathology / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000209:etiology / Q000473:pathology / Q000601:surgery; D012189:Retrospective Studies