Doppler sonography of renal obstruction: value of venous impedance index measurements.
OBJECTIVE
Arterial resistive index values have poor sensitivity and specificity for alterations in renal perfusion induced by collecting system obstruction. We aimed to determine whether the intrarenal venous impedance index values could be useful in evaluating renal parenchymal compliance in cases of obstruction and in differentiating acute obstruction from chronic cases.


METHODS
Fifteen patients with acute renal colic having unilateral stone disease and another 15 patients having unilateral chronic obstruction due to various causes were evaluated sonographically. The diagnosis was confirmed either by computed tomography or intravenous urography in all cases. Fifteen subjects with normal kidneys were investigated as a control group. All patients were examined prospectively by conventional and Doppler sonography. The impedance indices and peak flow signals of the interlobar arteries and veins of both kidneys were calculated from spectral Doppler waveforms in all 3 groups.


RESULTS
The mean venous impedance index on the acutely obstructed side was lower than the index on the unobstructed side: 0.25 +/- 0.07 and 0.53 +/- 0.3 (mean +/- SD), respectively (P = .005). The mean venous impedance index on the acutely obstructed side was less than the indices both on the chronically obstructed side and in the control subjects (P > .0001). In acute cases, the mean arterial resistive index on the obstructed side was higher than the index on the unobstructed side: 0.62 +/- 0.06 and 0.57 +/- 0.06, respectively (P = .001). No statistically significant difference was detected between other parameters evaluated for the test and control groups.


CONCLUSIONS
Renal venous impedance index values may be helpful in evaluating renal hemodynamics in obstruction and in differentiating acute obstruction from chronic cases when used in conjunction with the arterial resistive index.
Department of Radiology, School of Medicine, Gazi University, Besevler, Ankara, Turkey. sunaoktar@gazi.edu.tr
Suna Ozhan
SO
Oktar
Cem
C
Yücel
Hakan
H
Ozdemir
Devrim
D
Karaosmanoglu
D000293:Adolescent; D000328:Adult; D001783:Blood Flow Velocity / Q000502:physiology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007668:Kidney / Q000098:blood supply / Q000000981:diagnostic imaging*; D007674:Kidney Diseases / Q000175:diagnosis* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012077:Renal Artery / Q000000981:diagnostic imaging; D012079:Renal Circulation / Q000502:physiology; D012082:Renal Veins / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods; D018615:Ultrasonography, Doppler, Color / Q000379:methods*; D014517:Ureteral Obstruction / Q000175:diagnosis*; D014565:Urogenital Neoplasms / Q000175:diagnosis*; D014567:Urography; D014655:Vascular Resistance / Q000502:physiology*