title: The Toronto SPV bioprosthesis: one-year results in 100 patients.
abstract: BACKGROUND
  We studied the long-term results of heart valve replacement with the Toronto SPV bioprosthesis.
  
  
  METHODS
  From March 1993 until July 1994 the Toronto stentless bioprosthesis was implanted in 100 selected patients with a mean age of 70.7 years. The predominant aortic valve lesion was stenosis in 94 and insufficiency in 6 cases. Eighty-eight patients received a valve 25 mm in diameter or larger. Additional coronary artery bypass grafting was performed in 37 cases. Hospital mortality was 4%. Seventy-four patients were seen at 6 months and 38 patients at 1 year follow-up.
  
  
  RESULTS
  Structural deterioration, thromboembolism or hemorrhage were not encountered. Nonstructural dysfunction lead to reoperation in 1 patient. Another patient presented with endocarditis at 1 year postoperatively. There were no other valve-related complications. Echocardiographic mean pressure gradients ranged from 7.7 to 11.1 mm Hg postoperatively. There was a significant decrease in pressure gradients at 6 months of follow-up. Minimal aortic valve incompetence was seen in 3 patients.
  
  
  CONCLUSIONS
  The Toronto stentless bioprosthesis has superior hemodynamics and is an excellent alternative to conventional stented bioprostheses. Long-term evaluation has to prove whether this promising new valve can live up to its expectations.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Georg-August-University Göttingen, Germany.
authors.forename: F W
authors.initials: FW
authors.lastname: Mohr
authors.forename: T
authors.initials: T
authors.lastname: Walther
authors.forename: M
authors.initials: M
authors.lastname: Baryalei
authors.forename: V
authors.initials: V
authors.lastname: Falk
authors.forename: R
authors.initials: R
authors.lastname: Autschbach
authors.forename: A
authors.initials: A
authors.lastname: Scheidt
authors.forename: H
authors.initials: H
authors.lastname: Dalichau
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000601:surgery; D001022:Aortic Valve Insufficiency / Q000601:surgery*; D001024:Aortic Valve Stenosis / Q000601:surgery*; D001705:Bioprosthesis; D005069:Evaluation Studies as Topic; D005260:Female; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies