title: Reoperation of left heart valve bioprostheses according to age at implantation.
abstract: BACKGROUND
  Evidence supporting the use of bioprostheses for heart valve replacement in young adults is accumulating. However, reoperation data, which may help guide clinical decision making in young patients, remains poorly defined in the literature.
  
  
  RESULTS
  We examined the need for reoperation in 3975 patients who underwent first-time bioprosthetic aortic valve replacement (AVR) (n=3152) or mitral valve replacement (MVR) (n=823). There were 895 patients below the age of 60 years at bioprosthesis implant (AVR, n=636; MVR, n=259). The median interval to reoperation of contemporary, stented aortic bioprostheses was 7.74 years (95% CI 7.28 to 9.97 years) in patients less than 40 years, and 12.93 years (95% CI 11.10 to 15.76 years) in patients between 40 and 60 years of age. Multivariable risk factors associated with reoperation following bioprosthetic AVR include age (hazard ratio [HR] 0.94 per year, 95% CI 0.91 to 0.96, P<0.001) and concomitant coronary artery bypass grafting (HR 0.34, 95% CI 0.11 to 0.99, P=0.04). The median interval to reoperation of contemporary mitral bioprostheses was 8.11 years (95% CI 5.79 to 16.50 years) in patients less than 40 years, and 10.14 years (95% CI 8.64 to 11.14 years) in patients between 40 and 60 years of age. As for AVR, age (HR 0.96 per year, 95% CI 0.95 to 0.98, P<0.001) and concomitant coronary artery bypass grafting (HR 0.55, 95% CI 0.32 to 0.93, P=0.03) were associated with decreased reoperation risk following bioprosthetic MVR.
  
  
  CONCLUSIONS
  These data constitute clinically relevant age-specific prognostic information regarding reoperation in young patients, who may wish to select a bioprosthesis at initial left heart valve replacement.
authors.affiliation: Division of Cardiac Surgery, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: Vincent
authors.initials: V
authors.lastname: Chan
authors.forename: Tarek
authors.initials: T
authors.lastname: Malas
authors.forename: Harry
authors.initials: H
authors.lastname: Lapierre
authors.forename: Munir
authors.initials: M
authors.lastname: Boodhwani
authors.forename: B-Khanh
authors.initials: BK
authors.lastname: Lam
authors.forename: Fraser D
authors.initials: FD
authors.lastname: Rubens
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Hendry
authors.forename: Roy G
authors.initials: RG
authors.lastname: Masters
authors.forename: William
authors.initials: W
authors.lastname: Goldstein
authors.forename: Thierry G
authors.initials: TG
authors.lastname: Mesana
authors.forename: Marc
authors.initials: M
authors.lastname: Ruel
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000601:surgery*; D001705:Bioprosthesis; D005500:Follow-Up Studies; D006349:Heart Valve Diseases / Q000175:diagnosis / Q000601:surgery*; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000706:statistics & numerical data*; D006801:Humans; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D011379:Prognosis; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome