title: Long-term clinical performance of Sorin tilting-disc mechanical prostheses in the mitral and aortic position.
abstract: OBJECTIVE
  Analyzing the long term performance of sorin tilting-disc mechanical prostheses.
  
  
  METHODS
  Retrospective patient-oriented study. The total follow-up was 460.2 patient-years. Follow-up data was obtained from the patients themselves or from their relatives.
  
  
  METHODS
  Department of Cardiovascular Surgery in a general community hospital.
  
  
  METHODS
  Seventy four patients undergoing valve replacement with Sorin tilting-disc mechanical prostheses between May, 1982 and July 1991.
  
  
  METHODS
  Thirty one of those patients underwent isolated mitral valve replacement (MVR) and 43 isolated aortic valve replacement (AVR).
  
  
  METHODS
  The incidence of the different complications is expressed as linearized rates. Actuarial analysis was performed with the Kaplan-Meier method.
  
  
  RESULTS
  Linearized rates for MVR and AVR for the different complications (events per 100 patient-years) were, respectively: Late mortality: 4.5 +/- 1.6 and 1.8 +/- 0.8; Thromboembolism: 3.4 +/- 1.4 and 1.1 +/- 0.6; Anticoagulant-related hemorrhage: 2.8 +/- 1.3 and 0.3 +/- 0.3; Prosthetic endocarditis: 1.1 +/- 0.8 and 0.7 +/- 0.5; Non-structural dysfunction: 0.5 +/- 0.5 and 1.1 +/- 0.6; Reoperation: 1.1 +/- 0.8 and 0.3 +/- 0.3. Actuarial probabilities of freedom from the different complications were, respectively, at 13 years follow-up for MVR and 12 years follow-up for AVR, the following: Late mortality: 45.7 +/- 12.4% and 70.3 +/- 7.9%; Thromboembolism: 74.6 +/- 10.8% and 90.7 +/- 5.1%; Anticoagulant-related hemorrhage: 79.4 +/- 11.6% and 97.3 +/- 2.7%; Prosthetic endocarditis: 92.7 +/- 4.9% and 91.2 +/- 6.4%; Non-structural dysfunction: 95.6 +/- 4.3% and 88.2 +/- 6.6%; Reoperation: 83.6 +/- 11.8% and 97.3 +/- 2.7%. All valve-related mortality and morbidity: 42.2 +/- 11.0% and 56.7 +/- 8.6%. There was no instances of prosthetic structural failure.
  
  
  CONCLUSIONS
  The Sorin mechanical prosthesis presents a good durability and its performance in the long term is comparable to other tilting-disc devices of the same generation.
authors.affiliation: Department of Cardiovascular Surgery, Hospital N. S. del Pino, Las Palmas de Gran Canaria, Canary Islands, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Hurle
authors.forename: C
authors.initials: C
authors.lastname: Abad
authors.forename: J
authors.initials: J
authors.lastname: Feijoo
authors.forename: V
authors.initials: V
authors.lastname: Ray
authors.forename: G
authors.initials: G
authors.lastname: Ponce
mesh_terms: D000206:Actuarial Analysis; D000328:Adult; D000368:Aged; D001021:Aortic Valve / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis / Q000009:adverse effects*; D019918:Heart Valve Prosthesis Implantation / Q000401:mortality; D006470:Hemorrhage / Q000139:chemically induced; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections; D012086:Reoperation; D015996:Survival Rate; D013923:Thromboembolism / Q000209:etiology; D013927:Thrombosis / Q000209:etiology