title: Renal artery stenosis: changes in intrarenal Doppler waveform following percutaneous transluminal angioplasty.
abstract: OBJECTIVE
  To examine the extent of the changes in the intrarenal spectral waveform patterns after percutaneous transluminal angioplasty (PTA) and whether there is a correlation with the angiographic and clinical results.
  
  
  METHODS
  In 44 patients with 68 PTAs we analyzed the intrarenal spectral waveform regarding the existence of a tardus-parvus pattern before and after PTA.
  
  
  RESULTS
  In 51 of the 60 cases with a tardus-parvus pattern prior to PTA, a complete normalization of the spectral wave-form was noted. There was no correlation between the Doppler result after PTA and the angiographic and clinical result. In contrast there was a significant correlation between the Doppler result before PTA and the clinical outcome: patients with a normal intrarenal spectral waveform before PTA showed no improvement in their arterial hypertension.
  
  
  CONCLUSIONS
  Our results indicate that a patient with a normal spectral waveform analysis does not response to PTA. However, there is still an unpredictable clinical response even if a patient has an abnormal intrarenal spectral waveform prior to PTA and a complete normalization after PTA.
authors.affiliation: Radiologische Klinik, Klinikum Barmen, Universität Witten-Herdecke, Wuppertal, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Stuhrmann
authors.forename: T
authors.initials: T
authors.lastname: Jahnke
authors.forename: C
authors.initials: C
authors.lastname: Roefke
authors.forename: B M
authors.initials: BM
authors.lastname: Cramer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000792:Angiography; D000800:Angioplasty, Balloon; D001783:Blood Flow Velocity; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011300:Preoperative Care; D012078:Renal Artery Obstruction / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy*; D012680:Sensitivity and Specificity; D016896:Treatment Outcome; D018608:Ultrasonography, Doppler; D014654:Vascular Patency / Q000502:physiology