title: [Valve replacement with Macchi prosthesis].
abstract: OBJECTIVE
  to evaluate the performance of a new ball valve prosthesis.
  
  
  METHODS
  set up of two groups of patients who underwent mitral valve replacement with two different prosthesis: the Macchi prosthesis under evaluation and the well known Starr-Edwards model prosthesis. The chi-square test was used to compare the results.
  
  
  METHODS
  Patients referred for valvular surgery.
  
  
  METHODS
  One group of 98 consecutive patients who underwent isolated mitral valve replacement with a Macchi prosthesis from January 1984 to June 30 1986 was compared to a matched group of 49 patients who received a Starr-Edwards prosthesis in the same period of time. Follow-up data were available from 99% patients in the Macchi group 96% in the Starr-Edwards group, with a mean follow-up time of 35.2 (2-57) and 42.9 (4-62) months, respectively.
  
  
  RESULTS
  There was no statistical difference in the incidence per 100 patients--month of prosthetic complications--thromboembolism, hemorrhagic events, prosthetic endocarditis, reoperation and mechanical failure.
  
  
  CONCLUSIONS
  In our experience and with the available follow-up data the Macchi prosthesis is a good cost effective option when there is indication for a ball valve prosthesis.
authors.affiliation: Centro de Cirurgia Torácica Hospital de São João Porto.
authors.forename: P
authors.initials: P
authors.lastname: Pinho
authors.forename: L
authors.initials: L
authors.lastname: Vouga
authors.forename: J P
authors.initials: JP
authors.lastname: Torres
authors.forename: F
authors.initials: F
authors.lastname: Machado
authors.forename: A
authors.initials: A
authors.lastname: Graça
authors.forename: F
authors.initials: F
authors.lastname: Barreiros
authors.forename: R
authors.initials: R
authors.lastname: Nunes
authors.forename: V
authors.initials: V
authors.lastname: Monteiro
authors.forename: M
authors.initials: M
authors.lastname: Guerreiro
authors.forename: M R
authors.initials: MR
authors.lastname: Gomes
mesh_terms: D000328:Adult; D005069:Evaluation Studies as Topic; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis / Q000009:adverse effects / Q000401:mortality; D006801:Humans; D011474:Prosthesis Design; D015996:Survival Rate
vernacular_title: Substituição valvular com proótese de Macchi.