title: The Ultracor tilting disc heart valve prosthesis: a seven-year study.
abstract: OBJECTIVE
  The Ultracor heart valve is a recent entry in the evolution of the tilting disc valve. This report summarizes the experience with the Ultracor valve from three European centers.
  
  
  METHODS
  Between 1990 and 1996, 446 patients received 499 Ultracor heart valve prostheses in 450 procedures, including 225 (50.0%) aortic, 172 (38.2%) mitral and 49 (10.9%) double valve replacements. An additional four (1.0%) patients had mitral valve replacement (MVR) added to a previous aortic valve replacement (AVR) and were considered double valve replacement (DVR) patients. The total follow up was 751 patient-years (pt-yr) for AVR (mean 3.4), 440 pt-yr for MVR (mean 2.6) and 125 pt-yr for DVR (mean 2.4). Nine patients (one AVR, eight MVR) were lost to follow up, which was 98% complete.
  
  
  RESULTS
  The actuarial survival rate, including operative mortality rate, at five years was 90% for AVR, 77% for MVR and 82% for DVR. The linearized complication rates (%/year) for AVR, MVR and DVR were: 2.1, 4.0 and 4.0 for late mortality; 0.1, 3.0 and 0.8 for thromboembolism; 0, 0.2 and 0 for thrombosis; 2.0, 1.6 and 1.6 for anticoagulant-related hemorrhage (ACH); 0.3, 0.5 and 1.6 for prosthetic valve endocarditis (PVE); and 0.5, 0.9 and 3.2 for reoperation, respectively. The actuarial rates of freedom from complications at five years were: thromboembolism, 99% for AVR and 88% for MVR; thrombosis, 100% for AVR and 99% for MVR; ACH, 91% for AVR and 94% for MVR; PVE, 99% for AVR and 97% for MVR; reoperation, 98% for AVR and 98% for MVR. No structural failure was observed.
  
  
  CONCLUSIONS
  Seven years' experience showed the Ultracor heart valve prosthesis to be comparable with other currently used mechanical heart valves. Continued evaluation of this prosthesis is warranted in order to obtain a more extended clinical follow up.
authors.affiliation: Providence Health System, Portland, Oregon, USA.
authors.forename: H H
authors.initials: HH
authors.lastname: Li
authors.forename: R R
authors.initials: RR
authors.lastname: Jeffrey
authors.forename: K G
authors.initials: KG
authors.lastname: Davidson
authors.forename: D
authors.initials: D
authors.lastname: Seifert
authors.forename: R
authors.initials: R
authors.lastname: Körfer
authors.forename: G L
authors.initials: GL
authors.lastname: Grunkemeier
mesh_terms: D000328:Adult; D000368:Aged; D001021:Aortic Valve; D001022:Aortic Valve Insufficiency / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000601:surgery; D005069:Evaluation Studies as Topic; D005260:Female; D006349:Heart Valve Diseases / Q000401:mortality / Q000601:surgery*; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve; D011474:Prosthesis Design; D012189:Retrospective Studies; D015996:Survival Rate