title: Colour Doppler ultrasound: a new index improves the diagnosis of renal artery stenosis.
abstract: The description of a new index, the renal-segmental ratio (RSR), and the comparison of its performance with other conventional Doppler parameters for the detection of renal artery stenosis (RAS). A total of 96 renal units were studied with angiography and colour Doppler ultrasound (US) independently. The Doppler parameters applied were: 1. renal artery peak systolic velocity (RE-PSV), 2. renal-aortic ratio (RAR), 3. early systolic acceleration (ESA), and 4. renal-segmental ratio (RSR). The angiographic study was used as the "gold standard" for the identification of > or = 50% RAS. The results indicate that RSR (sensitivity: 93.33%, specificity: 89.47%) and RE-PSV (sensitivity: 83.33%, specificity: 89.47%) were the best criteria for RAS diagnosis (p values <0.05). The results show that colour Doppler US is a reliable diagnostic modality for RAS diagnosis. The new index (RSR) improves the effectiveness of the method.
authors.affiliation: Division of Ultrasound, Radiology Institute, University of São Paulo Medical School, SP, Brazil. ilkao@usp.br
authors.forename: I R
authors.initials: IR
authors.lastname: Souza de Oliveira
authors.forename: A
authors.initials: A
authors.lastname: Widman
authors.forename: L J
authors.initials: LJ
authors.lastname: Molnar
authors.forename: J T
authors.initials: JT
authors.lastname: Fukushima
authors.forename: J N
authors.initials: JN
authors.lastname: Praxedes
authors.forename: G G
authors.initials: GG
authors.lastname: Cerri
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D001783:Blood Flow Velocity; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012372:ROC Curve; D012077:Renal Artery / Q000000981:diagnostic imaging*; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D018615:Ultrasonography, Doppler, Color