title: Stentless bioprostheses in aortic root disease.
abstract: BACKGROUND
  The availability of aortic homografts is steadily decreasing. In the meantime, stentless xenografts convey similar flow characteristics, and tissue preservation methods are improving durability. Initially, these valves were contraindicated in aortic roots with discrepancy between annulus and sinotubular junction or with extensive calcification or sepsis. With increasing experience stentless xenografts are now applied in a wide spectrum of aortic root disease.
  
  
  METHODS
  I reviewed our own experience with stentless aortic bioprosthesis for aortic valve replacement (AVR) and more taxing root problems. I used these valves in aortic aneurysm repair, acute Type A dissection, and for endocarditis with abcess formation. I studied valve hemodynamics, regression of left ventricular hypertrophy, and comparative survival with stented bioprostheses.
  
  
  RESULTS
  Stentless bioprostheses convey hemodynamic and possibly survival benefit through a low incidence of valve-related complications. They provide a useful alternative to aortic homografts in endocarditis, Type A dissection, and aortic aneurysm surgery.
  
  
  CONCLUSIONS
  Stentless bioprostheses are no longer confined to AVR alone. Experience supports the use of stentless bioprostheses where aortic homografts were previously applied. With availability in a wide range of sizes.
authors.affiliation: Oxford Heart Centre, the John Radcliffe Hospital, Headington, Oxford, UK.
authors.forename: S
authors.initials: S
authors.lastname: Westaby
mesh_terms: D000818:Animals; D001021:Aortic Valve / Q000601:surgery; D001705:Bioprosthesis; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000295:instrumentation / Q000401:mortality; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D011474:Prosthesis Design; D015607:Stents; D015996:Survival Rate; D013552:Swine; D016896:Treatment Outcome; D016277:Ventricular Function, Left / Q000502:physiology