title: The spectrum of severe rheumatic mitral valve disease in a developing country. Correlations among clinical presentation, surgical pathologic findings, and hemodynamic sequelae.
abstract: OBJECTIVE
  To describe the demographic, pathologic, and hemodynamic profiles of patients with severe rheumatic mitral valve disease in a developing country and to assess their relation to uncontrolled rheumatic disease activity.
  
  
  METHODS
  Retrospective, cross-sectional, cohort study.
  
  
  METHODS
  Tertiary medical center in Soweto, South Africa.
  
  
  METHODS
  714 of 737 consecutive black patients, 4 to 73 years old, with pure mitral regurgitation, pure mitral stenosis, or mixed mitral disease who had mitral valve surgery and in whom preoperative and surgical data were concordant.
  
  
  METHODS
  Valve lesions were evaluated on the basis of clinical, echocardiographic, hemodynamic, and surgical pathologic data. Active rheumatic carditis was diagnosed according to clinical evidence for concurrent acute rheumatic fever (Jones criteria), macroscopic appearances at surgery, and histologic findings.
  
  
  RESULTS
  219 patients had pure mitral regurgitation, 275 had pure mitral stenosis, and 220 had mixed lesions. Ongoing rheumatic activity was diagnosed in 106 patients with pure regurgitation (47%) and in only 5 patients with pure stenosis (2%). Pure regurgitation was the most common lesion in the first and second decades; the relative prevalence of pure stenosis increased with age. Purely regurgitant valves had pliable, unscarred leaflets (95%), dilated mitral annuli (95%), elongated chordae tendineae (92%), and anterior leaflet prolapse (81%). In contrast, purely stenotic valves had fused leaflet commissures (100%) and rigid leaflets (38%) but no evidence of prolapse.
  
  
  CONCLUSIONS
  The spectrum of rheumatic mitral valve disease that is hemodynamically severe in developing countries differs from that currently reported in the United States. Severe, pure rheumatic mitral regurgitation is as prevalent as pure stenosis but has an entirely different time course, surgical anatomy, and relation to disease activity, suggesting a separate pathophysiologic mechanism.
authors.affiliation: University of Witwatersrand, Johannesburg, South Africa.
authors.forename: R H
authors.initials: RH
authors.lastname: Marcus
authors.forename: P
authors.initials: P
authors.lastname: Sareli
authors.forename: W A
authors.initials: WA
authors.lastname: Pocock
authors.forename: J B
authors.initials: JB
authors.lastname: Barlow
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D003906:Developing Countries; D005260:Female; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000453:epidemiology / Q000473:pathology / Q000503:physiopathology; D008946:Mitral Valve Stenosis / Q000453:epidemiology / Q000473:pathology / Q000503:physiopathology; D012189:Retrospective Studies; D012214:Rheumatic Heart Disease / Q000453:epidemiology / Q000473:pathology / Q000503:physiopathology; D012720:Severity of Illness Index; D013019:South Africa / Q000453:epidemiology