title: Comparison of carbon-impregnated and standard ePTFE prostheses in extra-anatomical anterior tibial artery bypass: a prospective randomized multicenter study.
abstract: OBJECTIVE
  The aim of this study was to find out whether carbon impregnated ePTFE vascular grafts have better long-term patency or limb salvage rates than Standard ePTFE vascular grafts in crural revascularization in patients with chronic critical ischemia.
  
  
  METHODS
  Prospective randomized multicenter trial. Study endpoints were 36 months follow-up, major amputation or death.
  
  
  METHODS
  We used 6mm carbon ePTFE (Carboflo) and 6mm standard ePTFE vascular grafts (both C.R. BARD Inc./IMPRA).
  
  
  METHODS
  From June 1995 to November 1998, 283 patients were randomly assigned either to carbon (C) (n=140) or to standard (St) ePTFE (n=143) vascular grafts at 19 centres. A standard protocol was used with lateral extra-anatomic course of the graft to the anterior tibial artery and of a distal vein patch or cuff. More than 90% of the patients had rest pain or gangrene.
  
  
  RESULTS
  Two hundred and sixty-five (C=130; St=135) patients could be analysed in the intention-to-treat (ITT) group. Primary patency, secondary patency and limb salvage rates after 36 months were 33, 43 and 67% in the carbon- and 30, 38 and 58% in the standard PTFE group, respectively, (log-rank test: p=0.20, 0.12 and 0.16). Additional analyses were made per protocol (PP) and as-treated (AT). The retrospective power of the study was calculated as 79 and 83%.
  
  
  CONCLUSIONS
  The ITT, PP and AT analysis, showed no statistically significant advantage of the carbon ePTFE vascular graft in terms of patency or limb salvage over the standard ePTFE vascular graft at 36 months.
authors.affiliation: Department of Thoracic and Vascular Surgery, University Hospital Ulm, Ulm, Germany.
authors.forename: X
authors.initials: X
authors.lastname: Kapfer
authors.forename: W
authors.initials: W
authors.lastname: Meichelboeck
authors.forename: F-M
authors.initials: FM
authors.lastname: Groegler
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001157:Arterial Occlusive Diseases / Q000401:mortality / Q000601:surgery; D001807:Blood Vessel Prosthesis; D002244:Carbon; D020099:Coated Materials, Biocompatible; D005260:Female; D006083:Graft Occlusion, Vascular / Q000401:mortality / Q000601:surgery; D006801:Humans; D007511:Ischemia / Q000401:mortality / Q000601:surgery; D007866:Leg / Q000098:blood supply; D023821:Limb Salvage; D008297:Male; D008875:Middle Aged; D011138:Polytetrafluoroethylene; D011446:Prospective Studies; D011474:Prosthesis Design; D012086:Reoperation; D016909:Tibial Arteries / Q000601:surgery*; D016896:Treatment Outcome; D014654:Vascular Patency
chemical_list: D020099:Coated Materials, Biocompatible; D002244:Carbon; D011138:Polytetrafluoroethylene