Obstructive vs nonobstructive dilatation of the renal collecting system in children: distinction with duplex sonography.
- 1 February 1993
- journal article
- Published by American Roentgen Ray Society in American Journal of Roentgenology
- Vol. 160 (2) , 353-357
- https://doi.org/10.2214/ajr.160.2.8424349
Abstract
The resistive index in cortical or arcuate renal arteries of children was calculated to determine whether obstructive uropathy could be differentiated from nonobstructive dilatation.Kidneys (n = 176) were prospectively evaluated by using duplex Doppler sonography in patients 3 days to 20 years old. Obstruction was confirmed by renography with furosemide and/or by surgery.The normal resistive index was 0.57 +/- 0.06 and the normal difference in resistive indexes between kidneys was 0.03 +/- 0.02 (n = 15). Abnormal values indicative of ureteropelvic junction obstruction were defined as the normal mean +/- 2 SD (i.e., a resistive index of > or = 0.70 plus a difference in resistive indexes between kidneys of > or = 0.08). Patients with unilateral dilatation and obstruction at the ureteropelvic junction (n = 20) had a mean resistive index of 0.77 +/- 0.05 and a difference in resistive indexes between kidneys of 0.16 +/- 0.05 (p < .001 compared with patients with normal kidneys and p < .001 compared with patien...Keywords
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