title: Prosthetic above-knee femoropopliteal bypass grafting: five-year results of a randomized trial.
abstract: OBJECTIVE
  This trial was designed to identify factors affecting patency rates of primary prosthetic above-knee femoropopliteal bypass grafts at 5 years.
  
  
  METHODS
  A multi-institutional, prospective trial randomized 240 patients to compare patency rates of Gore-tex and Hemashield above-knee femoropopliteal bypass grafts at 5 years. Univariate comparisons of patency between levels of each prognostic variable were made with the Kaplan-Meier method. Variables that had a univariate P value less than.25 or those known to be important were submitted to a Cox regression analysis.
  
  
  RESULTS
  The patient survival rate at 5 years was 59.4%. There were no differences in primary or secondary patency rates at 5 years between the two graft materials (primary, 45% vs 43% and secondary, 68% vs 68%). The risk for graft occlusion was significantly increased for patients younger than 65 years (2.1; P =.001) and for grafts with a diameter less than 7 mm (1.65; P =.0219). Variables with no apparent independent effect on patency rates were smoking status, runoff, diabetes mellitus, sex, presenting symptoms, and postoperative treatment with aspirin or Coumadin. Noninvasive test results were not predictive of subsequent graft function.
  
  
  CONCLUSIONS
  Although the type of prosthetic used for above-knee femoropopliteal bypass grafts does not affect 5-year patency rates, age and graft size do influence results. These factors should be considered before a prosthetic bypass grafting procedure. Furthermore, these data should serve as a contemporary standard, with which evolving and conventional procedures can be compared.
authors.affiliation: Division of Vascular Surgery, University of Rochester Medical Center, Rochester, NY 14642, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Green
authors.forename: W M
authors.initials: WM
authors.lastname: Abbott
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: J R
authors.initials: JR
authors.lastname: Wheeler
authors.forename: N
authors.initials: N
authors.lastname: Miller
authors.forename: F J
authors.initials: FJ
authors.lastname: Veith
authors.forename: S
authors.initials: S
authors.lastname: Money
authors.forename: H E
authors.initials: HE
authors.lastname: Garrett
mesh_terms: D000368:Aged; D001807:Blood Vessel Prosthesis; D019917:Blood Vessel Prosthesis Implantation; D005260:Female; D005263:Femoral Artery / Q000601:surgery*; D006083:Graft Occlusion, Vascular / Q000453:epidemiology; D006801:Humans; D007511:Ischemia / Q000601:surgery; D007866:Leg / Q000098:blood supply; D008297:Male; D008875:Middle Aged; D011091:Polyesters; D011138:Polytetrafluoroethylene; D011150:Popliteal Artery / Q000601:surgery*; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors; D013997:Time Factors; D014654:Vascular Patency
chemical_list: D011091:Polyesters; D011138:Polytetrafluoroethylene