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Journal of Ultrasound in Medicine, Vol 10, Issue 4 189-194, Copyright © 1991 by American Institute of Ultrasound in Medicine
Duplex Doppler sonography in renal parenchymal disease. Histopathologic correlation
G. H. Mostbeck, R. Kain, R. Mallek, K. Derfler, R. Walter, L. Havelec and D. Tscholakoff
Division of Radiology, University of Vienna Hospital, Austria.
To evaluate the histopathologic changes influencing Doppler measurements of
the resistive index (RI) in renal arteries in renal parenchymal diseases,
68 kidneys in 34 consecutive patients with various forms of renal
parenchymal diseases were studied by duplex Doppler ultrasound (duplex US)
immediately before percutaneous renal biopsy. The RI, renal length, and
renal cortical echogenicity were correlated with the amount of glomerular,
interstitial, and vascular changes graded on a scale from 0 to 100. The
renal vascular resistance and therefore the RI are significantly correlated
with the prevalence of arteriolosclerosis, glomerular sclerosis,
arteriosclerosis, edema, and focal interstitial fibrosis. There was no
significant difference of the RI in five groups of different renal
parenchymal diseases. Of 34 patients, 24 presented with an RI less than
0.7, which was thought to be within the normal range so far. Additionally,
the RI increases as the patient's age increases, due to higher incidence of
arteriosclerosis. Of our patients, 44% presented with normal cortical
echogenicity. Quantitative duplex US using the RI does not reliably
distinguish different types of renal medical disorders.
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