title: [Intrarenal duplex sonography in detecting flow changes after renal PTA].
abstract: OBJECTIVE
  Changes of the intrarenal Doppler signal were analysed before and after renal balloon dilatation to assess the technical success of PTRA.
  
  
  METHODS
  In 33 patients, intrarenal Doppler signal was depicted before and after renal PTA. Doppler flow curve was analysed by using the acceleration index (AI), acceleration time index (AT) and resistance index (RI); for all indices side ratios (AI-R, AT-R and RI-R) were calculated. Balloon dilatation was angiographically successful in all cases. Average stenosis graded 71% before and 21% after PTA.
  
  
  RESULTS
  By definition of limits for all indices used, a single patient was graded as non-stenotic before balloon dilatation by application of AI/AI-R and no patient was graded nonstenotic by AI/RI-R. After renal PTA, all indices significantly changed towards normal findings and by application of both AI/AI-R and AI/RI-R, only a single patient was graded stenotic after PTA.
  
  
  CONCLUSIONS
  Intrarenal Doppler signal analysis reliably allows to detect flow changes following renal PTA in patients with renal artery stenosis. It may therefore be used as a noninvasive method to monitor flow improvement after renal PTA and during follow-up.
authors.affiliation: Klinik für Radiologische Diagnostik, RWTH Aachen.
authors.forename: D
authors.initials: D
authors.lastname: Vorwerk
authors.forename: F
authors.initials: F
authors.lastname: Speckamp
authors.forename: K
authors.initials: K
authors.lastname: Schürmann
authors.forename: J
authors.initials: J
authors.lastname: Rückforth
authors.forename: M
authors.initials: M
authors.lastname: Kilbinger
authors.forename: R W
authors.initials: RW
authors.lastname: Günther
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D000800:Angioplasty, Balloon; D002648:Child; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D012077:Renal Artery / Q000000981:diagnostic imaging / Q000503:physiopathology; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000628:therapy; D012079:Renal Circulation; D018615:Ultrasonography, Doppler, Color / Q000295:instrumentation / Q000379:methods
vernacular_title: Intrarenale Duplexsonographie zur Erfassung von Flussänderungen nach renaler PTA.