title: [Aortic valve/root replacement using a stentless bioprosthesis (Medtronic Freestyle valve)].
abstract: BACKGROUND
  The purpose of the study is to assess the clinical and hemodynamic performance of aortic valve replacement (AVR) with the Freestyle bioprosthesis.
  
  
  METHODS
  Twenty-one patients received AVR with a Freestyle aortic root bio-prosthesis between May 1998 and October 1999. Eighteen patients underwent AVR with subcoronary method and three patients with aortic root (full root) method. Patients were evaluated postoperatively at discharge by clinical examination and color Doppler echocardiography.
  
  
  RESULTS
  There was one death due to multi-organ failure. No patients experienced valve deterioration, paravalvular leak, unacceptable hemodynamic performance, nor thromboembolic event. Excellent function is demonstrated by very low gradient (mean gradient 7.2 +/- 4.7 mmHg) through aortic valve and no significant aortic regurgitation (none: 11, trivial/mild: 10). All patients had been in New York Heart Association Functional Class III and IV preoperatively, and after surgery, 17 patients were in Class I, and 3 were in Class II.
  
  
  CONCLUSIONS
  The Freestyle bioprosthesis has good clinical and hemodynamic performance without Coumadin. Further follow-up is required to evaluated valve durability.
authors.affiliation: Shonan Kamakura General Hospital, Kamakura, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Isomura
authors.forename: H
authors.initials: H
authors.lastname: Suma
authors.forename: T
authors.initials: T
authors.lastname: Horii
authors.forename: T
authors.initials: T
authors.lastname: Kobashi
authors.forename: H
authors.initials: H
authors.lastname: Kanemitsu
mesh_terms: D000328:Adult; D000368:Aged; D001021:Aortic Valve / Q000601:surgery*; D001705:Bioprosthesis; D015150:Echocardiography, Doppler; D005069:Evaluation Studies as Topic; D005260:Female; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome