title: B-flow imaging for the measurement of residual lumen diameter of renal artery stenosis.
abstract: BACKGROUND
  The aim of this study was to assess the accuracy and efficacy of B-flow imaging (BFI) in the diagnosis and measurement of renal artery stenosis (RAS) compared with color duplex ultrasonography (CDU) and digital subtraction angiography (DSA).
  
  
  METHODS
  Fifty-one consecutive patients with RAS diagnosed and measured with DSA were subsequently and independently examined with BFI for the measurement of residual lumen diameter, and with CDU for the measurement of peak systolic velocity and renal-aortic velocity ratio. The diagnostic performances of BFI and CDU in determining 60-99% RAS were compared by receiver operating characteristic curve analysis. The agreement between DSA and BFI stenosis measurements was evaluated with Bland-Altman method.
  
  
  RESULTS
  The area under curve was 0.983 for BFI and 0.959 for CDU, without a significant difference in diagnostic performances (p = 0.26). BFI yielded an 88% sensitivity and 94% specificity in the diagnosis of RAS with a 3% underestimation of RAS compared to DSA (95% confidence interval 1.4%, 4.6%).
  
  
  CONCLUSIONS
  BFI is an accurate method that minimally underestimates RAS. It might provide an additional benefit to CDU in patients with RAS.
authors: Turkiye Yuksek Ihtisas Hospital, Kizilay Sokak No. 4, 06100 Sihhiye, Ankara, Turkey.
authors: Muharrem
authors: M
authors: Tola
authors: Mehmet
authors: M
authors: Yurdakul
authors: Nilgün Isiksalan
authors: NI
authors: Ozbulbul
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D017130:Angioplasty; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012372:ROC Curve; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging* / Q000628:therapy; D012680:Sensitivity and Specificity; D018616:Ultrasonography, Doppler, Duplex