title: Mid-term results of reconstruction of the right ventricular outflow tract using cryopreserved homografts.
abstract: OBJECTIVE
  Homograft benefits include excellent hemodynamics, resistance to infection, decreased thromboembolic events, ease of handling, and lack of need for anticoagulation. We examined the short and mid-term results of right ventricular outflow tract (RVOT) reconstruction using cryopreserved homografts.
  
  
  METHODS
  From May 1998 to May 2005, 20 patients (male:female=10:10) underwent RVOT reconstruction using cryopreserved homografts. The median age was 23.8 years (range, 0.9 to 43.3 years) and the median body weight was 57 kg (range, 7.3 to 80 kg). Eighteen patients underwent re-operation after shunt or corrective operations. Homograft failure was defined as either re-operation for homograft replacement or patient death. Homograft dysfunction was defined as grade 3 or more than 3 of graft regurgitation and more than 40 mmHg of transvalvular pressure gradient under echocardiographic examination.
  
  
  RESULTS
  No operative mortality occurred and there were three major complications. Graft failure was observed in one male patient with tetralogy of Fallot. The 8-year freedom from graft failure was 87.5+/-11.7% and the 7-year freedom from graft dysfunction was 62.3+/-17.9%. Multivariable analysis revealed that the independent factor for graft dysfunction was age less than 10 years. In the analysis according to age group, the 7-year freedom from graft dysfunction in the group of patients older than 10 years was 100% and 25.0+/-21.7% in patients age 10 or younger (p= 0.03).
  
  
  CONCLUSIONS
  Right ventricular outflow reconstruction using cryopreserved homografts provided excellent short and mid-term results in most patients in this study. However, in patients younger than 10 years old, homografts for RVOT reconstruction showed a high dysfunction rate at mid-term.
authors.affiliation: Division of Cardiovascular Surgery, Yonsei Cardiovascular Center, Yonsei University College of Medicine, 250 Seongsanno, Seodaemun-gu, Seoul 120-752, Korea.
authors.forename: Young-Nam
authors.initials: YN
authors.lastname: Youn
authors.forename: Han Ki
authors.initials: HK
authors.lastname: Park
authors.forename: Do-Kyun
authors.initials: DK
authors.lastname: Kim
authors.forename: Seong Yong
authors.initials: SY
authors.lastname: Park
authors.forename: Gijong
authors.initials: G
authors.lastname: Yi
authors.forename: Young-Hwan
authors.initials: YH
authors.lastname: Park
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D015925:Cryopreservation; D005260:Female; D006331:Heart Diseases / Q000601:surgery*; D006352:Heart Ventricles / Q000637:transplantation*; D006801:Humans; D007223:Infant; D007431:Intraoperative Complications; D008297:Male; D011183:Postoperative Complications; D014184:Transplantation, Homologous / Q000009:adverse effects; D016896:Treatment Outcome