title: Interpretation of the results of Doppler ultrasound flow volume measurements of infrainguinal vein bypasses.
abstract: OBJECTIVE
  To evaluate a pattern for the interpretation of the results of intraoperative Doppler ultrasound flow volume measurement of infrainguinal vein bypasses.
  
  
  METHODS
  Retrospective analysis of prospective data.
  
  
  METHODS
  91 consecutively performed infrainguinal non-reversed free vein bypasses.
  
  
  METHODS
  Using preoperative angiograms, the run-off, which can be expected after the reconstruction, was evaluated by means of a point score. A first measurement of the flow volume was taken after the release of the blood flow and a second after administration of 20 mg Alprostadil into the bypass. From these two results, we calculated an average value, which was set in relation to the run-off score. From this we computed a relative flow, i.e. the flow per open crural vessel = per run-off score unit (quotient:flow/score).
  
  
  RESULTS
  The median relative flow of angiographically perfect reconstructions was 86 ml/min. In 14 reconstructions, the control angiogram showed stenoses: median relative flow 59 ml/min, range between 20 and a maximum of 75 ml/min. The practical application of the flow measurement requires a minimum relative flow guideline for stenosis-free reconstructions. A guideline of 80 ml/min would yield a sensitivity of 100% and a specificity of 68%.
  
  
  CONCLUSIONS
  Measurement of flow volume could be used as a screen, in order to filter out reconstructions, which must be further clarified with an angiogram. A further prospective evaluation of the value of volume flow is needed before any conclusive recommendations can be drawn.
authors.affiliation: Surgical Department, Elisabethinen Hospital, Fadinger Str. 1, A-4010 Linz, Austria. th.schwierz@gmx.at
authors.forename: T
authors.initials: T
authors.lastname: Schwierz
authors.forename: F
authors.initials: F
authors.lastname: Harnoncourt
authors.forename: W
authors.initials: W
authors.lastname: Havlicek
authors.forename: F
authors.initials: F
authors.lastname: Tomaselli
authors.forename: R
authors.initials: R
authors.lastname: Függer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001783:Blood Flow Velocity; D005260:Female; D006801:Humans; D007430:Intraoperative Care; D007866:Leg / Q000098:blood supply*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D018616:Ultrasonography, Doppler, Duplex; D014656:Vascular Surgical Procedures; D014680:Veins / Q000000981:diagnostic imaging* / Q000601:surgery*