title: Comparison of duplex ultrasonography and magnetic resonance imaging in the detection of significant renal artery stenosis.
abstract: OBJECTIVE
  The aim of our study was to evaluate duplex ultrasonography (DUS) and magnetic resonance angiography (MRA) in detection of haemodynamically significant renal artery stenosis (RAS).
  
  
  METHODS
  The study included patients with high clinical suspicion of renovascular hypertension (RVH). The imaging of renal arteries was performed by DUS, MRA and digital subtraction angiography (DSA). Significant RAS was defined as maximum systolic velocity > or =180 cm/sec (DUS) or as 60% reduction of the endoluminal arterial diameter (MRA, DSA). The results of DUS and MRA were assessed in respect to the results of DSA.
  
  
  RESULTS
  Arterial supply of 186 kidneys in 94 patients was evaluated. DSA revealed significant RAS in 61 kidneys evaluated. DUS was not able to examine arterial supply in 18 kidneys of 13 patients. In the detection of significant RAS, DUS was characterized by sensitivity and specificity of 85% and 84%. MRA achieved satisfactory imaging quality in all but one kidney evaluated. The sensitivity and specificity of MRA in the detection of significant RAS was 93% and 93%, respectively.
  
  
  CONCLUSIONS
  In patients with high clinical probability of RVH, MRA proved to be more reliable and superior in both sensitivity and specificity to DUS in the detection of significant RAS.
authors.affiliation: Charles University in Prague, Faculty of Medicine and University Hospital Hradec Králové, Czech Republic. solarmir@seznam.cz
authors.forename: Miroslav
authors.initials: M
authors.lastname: Solar
authors.forename: Jan
authors.initials: J
authors.lastname: Zizka
authors.forename: Antonín
authors.initials: A
authors.lastname: Krajina
authors.forename: Antonín
authors.initials: A
authors.lastname: Michl
authors.forename: Jan
authors.initials: J
authors.lastname: Raupach
authors.forename: Ludovit
authors.initials: L
authors.lastname: Klzo
authors.forename: Pavel
authors.initials: P
authors.lastname: Ryska
authors.forename: Jirí
authors.initials: J
authors.lastname: Ceral
mesh_terms: D000328:Adult; D000368:Aged; D015901:Angiography, Digital Subtraction; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D012077:Renal Artery / Q000000981:diagnostic imaging / Q000473:pathology; D012078:Renal Artery Obstruction / Q000175:diagnosis* / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D018616:Ultrasonography, Doppler, Duplex