title: Predischarge duplex imaging of infrainguinal vein grafts does not predict the development of stenoses.
abstract: BACKGROUND
  The aim of this study was to determine whether predischarge duplex imaging of an infrainguinal vein graft could predict the subsequent development of graft stenosis.
  
  
  METHODS
  Patients with infrainguinal vein grafts underwent a duplex scan of the entire graft before discharge from hospital. Grafts were classified as abnormal or normal based on the presence or absence of flow abnormalities (peak velocity ratio 1.5 or greater). All grafts were re-examined 1 month after surgery, at 3-monthly intervals for the first year and then every 6 months thereafter. A significant stenosis requiring correction was defined by a duplex-derived peak systolic velocity ratio of 3.0 or more. The relationship between the predischarge scan and subsequent development of stenosis was examined.
  
  
  RESULTS
  Forty-four grafts were recruited. Two occluded soon after a normal predischarge scan and were excluded from subsequent analysis. Predischarge abnormalities were found in 16 grafts. The abnormality in one graft required immediate correction. A further four grafts subsequently developed significant stenoses and required angioplasty. Of the 26 grafts with no predischarge abnormalities, 11 developed significant stenoses and underwent angioplasty. Abnormal predischarge duplex scans had a sensitivity and specificity of 31 and 58 per cent respectively for the development of stenoses. The positive and negative predictive values were 31 and 58 per cent respectively.
  
  
  CONCLUSIONS
  Predischarge duplex imaging cannot be used to predict the development of stenoses in infrainguinal vein grafts.
authors.affiliation: Department of Surgery, Leicester Royal Infirmary, UK.
authors.forename: D H
authors.initials: DH
authors.lastname: Olojugba
authors.forename: K
authors.initials: K
authors.lastname: Varty
authors.forename: T
authors.initials: T
authors.lastname: Hartsthorne
authors.forename: A R
authors.initials: AR
authors.lastname: Naylor
authors.forename: P R
authors.initials: PR
authors.lastname: Bell
authors.forename: N J
authors.initials: NJ
authors.lastname: London
mesh_terms: D001783:Blood Flow Velocity / Q000502:physiology; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging*; D006801:Humans; D011152:Popliteal Vein / Q000601:surgery*; D011182:Postoperative Care / Q000379:methods; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012501:Saphenous Vein / Q000601:surgery*; D012680:Sensitivity and Specificity; D018616:Ultrasonography, Doppler, Duplex; D014654:Vascular Patency / Q000502:physiology