title: Midterm results with the Sorin Monostrut heart valve prosthesis.
abstract: OBJECTIVE
  To monitor the hematological and clinical sequelae of a single tilting disc cardiac valve prosthesis.
  
  
  METHODS
  Prospective nonrandomized trial.
  
  
  METHODS
  University teaching hospital.
  
  
  METHODS
  All patients receiving a single mechanical cardiac valve prosthesis were offered the Sorin Monostrut valve if they met the criteria for valve use. Seventy-five per cent of the patients entered were in New York Heart Association (NYHA) functional class III or IV. One hundred and forty-seven patients were subsequently followed at three months and then yearly after valve implantation for seven years.
  
  
  METHODS
  At one year, preoperative indexes of hemolysis were compared with three-month and one-year postoperative values. Actuarial curves for survival, freedom from cerebrovascular events and explantation were constructed for the seven-year follow-up period.
  
  
  RESULTS
  Hemolysis, as measured by lactate dehydrogenase values, commonly occurs preoperatively, remaining significantly elevated three months and one year following valve implantation. Serum haptoglobin was normal preoperatively but was significantly low at one year. Anemia was uncommon and most patients had normal reticulocyte counts at one year. At three years, 81% of patients were in NYHA functional class I.
  
  
  CONCLUSIONS
  Midterm results show that this valve is structurally reliable and meets all current requirements for a safe mechanical valve.
authors.affiliation: Maritime Heart Center, Queen Elizabeth II Health Science Centre, Halifax, Nova Scotia.
authors.forename: C
authors.initials: C
authors.lastname: Forbes
authors.forename: D
authors.initials: D
authors.lastname: Ross
authors.forename: J
authors.initials: J
authors.lastname: Sullivan
authors.forename: I
authors.initials: I
authors.lastname: Ali
authors.forename: E
authors.initials: E
authors.lastname: Kinley
authors.forename: J
authors.initials: J
authors.lastname: Wood
authors.forename: R
authors.initials: R
authors.lastname: Landymore
authors.forename: D
authors.initials: D
authors.lastname: Murphy
mesh_terms: D000328:Adult; D000368:Aged; D001026:Coronary Artery Bypass; D003327:Coronary Disease / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006242:Haptoglobins / Q000032:analysis; D006350:Heart Valve Prosthesis / Q000592:standards; D019918:Heart Valve Prosthesis Implantation; D006485:Hemosiderin / Q000032:analysis; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D017701:Reticulocyte Count; D016896:Treatment Outcome
chemical_list: D006242:Haptoglobins; D006485:Hemosiderin; D007770:L-Lactate Dehydrogenase