title: The value of the peak systolic velocity ratio in the assessment of the haemodynamic significance of subcritical iliac artery stenoses.
abstract: OBJECTIVE
  iliac stenoses with a PSV ratio between 2.0 and 3.0 in patients with symptomatic arterial obstructive disease of the legs might be misinterpreted when compared with intra-arterial pressure measurements (IAPM). The aim of this study was to compare the value of the PSV ratio with IAPM as the reference standard in the assessment of the haemodynamic significance of subcritical iliac artery stenoses (iliac stenosis with PSV ratio between 1.5 and 3.5).
  
  
  METHODS
  fifty-eight iliac tracts in 53 consecutive patients with symptomatic arterial obstructive disease of the legs with an isolated stenosis with PSV ratio between 1.5 and 3.5 were studied prospectively. The results of those iliac duplex scanning were compared to IAPM. Results a poor agreement was found between IAPM and PSV ratios. For the PSV ratios > or =2.0, 2.5 and 3.0 the sensitivities were 74%, 37% and 16%, respectively. The specificities were 70%, 90% and 95%, the positive predictive values 82%, 88% and 86%, respectively, and the negative predictive values 58%, 43% and 37%, respectively.
  
  
  CONCLUSIONS
  the results of this study show that the PSV ratio parameter is not accurate enough to evaluate the haemodynamic significance of subcritical iliac artery stenoses.
authors.affiliation: Department of Vascular Surgery, G4-111, Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
authors.forename: S B
authors.initials: SB
authors.lastname: Coffi
authors.forename: D T
authors.initials: DT
authors.lastname: Ubbink
authors.forename: I
authors.initials: I
authors.lastname: Zwiers
authors.forename: A J
authors.initials: AJ
authors.lastname: van Gurp
authors.forename: D A
authors.initials: DA
authors.lastname: Legemate
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging* / Q000503:physiopathology; D001783:Blood Flow Velocity; D001795:Blood Pressure Determination / Q000379:methods; D005260:Female; D006439:Hemodynamics; D006801:Humans; D007083:Iliac Artery / Q000000981:diagnostic imaging*; D007866:Leg / Q000098:blood supply*; D008297:Male; D008875:Middle Aged; D016491:Peripheral Vascular Diseases / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D013599:Systole / Q000502:physiology; D018616:Ultrasonography, Doppler, Duplex