title: Graft patency evaluation with colour-Doppler ultrasonography after bypass surgery in Takayasu's arteritis: a direct colour-flow lumen imaging method.
abstract: OBJECTIVE
  To assess the feasibility and potential diagnostic usefulness of colour-Doppler flow imaging (CDFI) to detect complications of supra-aortic vascular bypass grafts in Takayasu's arteritis (TA).
  
  
  METHODS
  A prospective study.
  
  
  METHODS
  Nine supra-aortic grafts in six patients with Takayasu's arteritis.
  
  
  METHODS
  The minimal, maximal, and true colour-flow image diameters of the lumens of the grafts were measured and stenoses, occlusions, and dilatations were evaluated and compared with angiographic findings.
  
  
  RESULTS
  The sensitivity for detection in > 50% stenoses and in total occlusions was 75% while specificity was 100%. Only one 40% stenosis had been overlooked in whole. The maximal difference of stenosis by two methods was otherwise 20%.
  
  
  CONCLUSIONS
  CDFI was in general able to expose stenoses in supra-aortic grafts, but the lack of visibility of some grafts throughout their length cause the false results. It appears that some angiographies can be replaced by CDFI and that this is a suitable method for follow-up in symptom-free patients with grafts.
authors.affiliation: Department of Diagnostic Radiology, Helsinki University Central Hospital, Finland.
authors.forename: R O
authors.initials: RO
authors.lastname: Raninen
authors.forename: M S
authors.initials: MS
authors.lastname: Pamilo
authors.forename: K T
authors.initials: KT
authors.lastname: Leirisalo-Repo
authors.forename: P E
authors.initials: PE
authors.lastname: Hekali
mesh_terms: D000328:Adult; D000368:Aged; D015901:Angiography, Digital Subtraction; D019917:Blood Vessel Prosthesis Implantation; D005260:Female; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging*; D006801:Humans; D008875:Middle Aged; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D013625:Takayasu Arteritis / Q000000981:diagnostic imaging* / Q000601:surgery*; D018615:Ultrasonography, Doppler, Color; D014654:Vascular Patency; D014680:Veins / Q000637:transplantation