title: Comparison of durability of bioprostheses in tricuspid and mitral positions.
abstract: BACKGROUND
  Few reports have assessed differences in the durability of mitral and tricuspid bioprostheses after simultaneous implantation of the same bioprosthesis in both positions. We investigated the long-term outcome after simultaneous mitral valve replacement (MVR) and tricuspid valve supraannular implantation (TVSI) with the Carpentier-Edwards bioprostheses in patients with severe tricuspid regurgitation and advanced mitral valve disease.
  
  
  METHODS
  Between 1982 and 1998, 37 patients in our hospital underwent MVR and TVSI with Carpentier-Edwards bioprostheses. The mean age of the patients was 55+/-11 years. The average postoperative follow-up was 7.9+/-4.5 years after surgery (range 0 to 14.6 years, 315.1 patient-years). The follow-up rate was 100%. We evaluated the actuarial survival rate, the actuarial freedom from structural valve deterioration (SVD) and reoperation, and postoperative complications.
  
  
  RESULTS
  The overall actuarial survival rate at 13 years after the operation was 69%+/-31%. The actuarial freedom from SVD and reoperation in the mitral and tricuspid positions were 78+/-22 and 100% and 70+/-30 and 90%+/-10% (p = 0.03), respectively. No patient had systemic or pulmonary thromboembolism, or complications associated with fatal arrhythmia.
  
  
  CONCLUSIONS
  These results suggest that the bioprostheses in the tricuspid position yield significantly better long-term results than those in the mitral position after simultaneous MVR and TVSI.
authors.affiliation: Division of Cardiovascular Surgery, Mitsui Memorial Hospital, Tokyo, Japan. tohata@aol.com
authors.forename: T
authors.initials: T
authors.lastname: Ohata
authors.forename: I
authors.initials: I
authors.lastname: Kigawa
authors.forename: E
authors.initials: E
authors.lastname: Tohda
authors.forename: Y
authors.initials: Y
authors.lastname: Wanibuchi
mesh_terms: D000206:Actuarial Analysis; D000328:Adult; D000368:Aged; D001705:Bioprosthesis; D002423:Cause of Death; D005260:Female; D005500:Follow-Up Studies; D006349:Heart Valve Diseases / Q000401:mortality / Q000601:surgery*; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D011183:Postoperative Complications / Q000401:mortality; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D014261:Tricuspid Valve / Q000601:surgery*