DiPaolo B, Balestra E, Ricciatti A, Mioli V
Distinctive effects between obstructive and non-obstructive
pyelocaliectasis by duplex-Doppler ultrasonography
Am Soc Nephrol
J Am Soc Nephrol (abstract)
(Nov) 6:461 1995
This is an evaluation of duplex Doppler ultrasonography to detect
functional urinary tract obstruction. When there is obstruction
there is a rise in renal artery vascular resistance which results
in a more marked reduction in diastolic flow than in systolic
flow. Using duplex Doppler ultrasonography a resistance index
(RI) can be computed as the peak systolic frequency shift minus
the minimum diastolic frequency divided by the peak systolic
frequency. The new method was evaluated in 17 kidneys which were
found to be obstructed by other tests, in 15 kidneys with non-
obstructive dilatation, and in 27 kidneys without
pyelocaliectasis. The mean RI in the obstructive kidneys was
0.77, and in the non-obstructive dilated kidneys was 0.66. If
one used a level of 0.70 to discriminate, the sensitivity for
obstruction was 92% with a specificity of 88%. All non-dilated
normal kidneys had RI values greater than 0.70.
Comment: Comment: Duplex Doppler
ultrasonography appears to be a promising new technique to detect
renal obstruction.
(Daugirdas)
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Am Soc Nephrol
ARF etiology :
Urinary tract obstruction