Korean J Urol.  1997 Jun;38(6):595-599.

Significance of Renal Resistive Index in Children with Unilateral Ureteral Obstruction

• Choi BS
• Chung KH

Abstract

PURPOSE: We assessed the significance of renal resistive index (RI) in the diagnosis of unilateral ureteral obstruction in children.
MATERIALS AND METHODS
Duplex Doppler ultrasonography was performed in 4 children with unilateral ureteral obstruction which was proved by excretory urography, diuretic renal scan, and/ or pressure flow study. Renal RI values and RI ratios were calculated.
RESULTS
They were 3 males and one female 4 to 26 months old. In all cases, mean RI values of obstructed kidneys were higher than 0.70 which was discriminatory level for obstruction in adults. In contralateral normal kidneys, RI values were widely distributed (0.61 to 0.79). Mean RI values of obstructed kidneys were larger than that of contralateral normal kidneys, and RI ratios were larger than 1.11 in all patients.
CONCLUSION
We believe that the comparison of RI value between obstructed and contralateral normal kidney is valuable in the diagnosis of unilateral ureteral obstruction in children, and that RI ratio is also significantly. A prospective study with a larger number of patients is required to confirm this finding.

Keyword

RI ratio; unilateral ureteral obstruction; resistive index

MeSH Terms

Adult
Child*
Child, Preschool
Diagnosis
Female
Humans
Kidney
Male
Ultrasonography, Doppler, Duplex
Ureter*
Ureteral Obstruction*
Urography