title: [Intrarenal color Doppler ultrasound for exclusion of renal artery stenosis in cases of multiple renal arteries. Analysis of the Doppler spectrum and tardus parvus phenomenon].
abstract: OBJECTIVE
  To diagnose possible renal artery stenosis especially in case of multiple renal arteries by intrarenal colour-coded Duplex sonography.
  
  
  METHODS
  In 50 hypertensive patients lobar and interlobar arteries were looked for at 3 different levels. Analysis included the determination of the early systolic acceleration time and the assessment of the Doppler waveform, especially the "tardus-parvus" phenomenon. Intraarterial angiography was performed in all patients the next day.
  
  
  RESULTS
  In 48/50 patients the sonographic investigations were sufficiently evaluable. Angiography showed haemodynamically relevant stenosis in 13 patients, in 4 patients bilaterally. In 21 patients (42%) multiple renal arteries were found. Sensitivity and specificity in the diagnosis of renal artery stenosis was 77% respectively 46% (threshold value > or = 0.120 s). In 10/17 angiographically verified haemodynamically relevant renal artery stenosis a change of the Doppler waveform was noted; sensitivity in the diagnosis of renal artery stenosis was 69%, specificity 90%.
  
  
  CONCLUSIONS
  Intrarenal colour-coded Duplex sonography cannot be recommended as a screening tool for renal artery stenosis.
authors.affiliation: Klinik mit Poliklinik für Radiologie, Universitätskliniken Mainz.
authors.forename: H
authors.initials: H
authors.lastname: Strank
authors.forename: U
authors.initials: U
authors.lastname: Jaeger
authors.forename: A
authors.initials: A
authors.lastname: Teifke
mesh_terms: D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D005260:Female; D006801:Humans; D006978:Hypertension, Renovascular / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D012077:Renal Artery / Q000002:abnormalities*; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D018615:Ultrasonography, Doppler, Color
vernacular_title: Intrarenale Farbdopplersonographie zum Ausschluss von Nierenarterienstenosen bei Mehrfachversorgung. Analyse des Dopplerspektrums und des Tardus-parvus-Phänomens.