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Renal Doppler ultrasonography in infants with hydronephrosis

J Svitac1, M Zibolen, J Kliment

  • 1Department of Urology, Jessenius School of Medicine, Comenius University in Martin, Slovak Republic. zibolen@enelux.sk

International Urology and Nephrology
|September 17, 2002
PubMed

Insights

Renal Doppler ultrasonography can assess unilateral hydronephrosis in infants. Comparing resistive index (RI) values between kidneys helps differentiate obstruction, aiding diagnosis.

Area of Science:

  • Pediatric Nephrology
  • Medical Imaging
  • Diagnostic Ultrasound

Background:

  • Unilateral hydronephrosis is a common condition in infants.
  • Differentiating obstructive from non-obstructive causes is crucial for management.
  • Renal Doppler ultrasonography offers a non-invasive method for assessing renal perfusion.

Purpose of the Study:

  • To evaluate the utility of renal Doppler ultrasonography in assessing obstruction in unilateral hydronephrosis in infants.
  • To determine if resistive index (RI) measurements can distinguish between obstructed and non-obstructed hydronephrosis.

Main Methods:

  • A cohort of 19 infants with unilateral hydronephrosis was studied.
  • Renal Doppler ultrasonography was performed to measure the resistive index (RI) in both the affected and healthy kidneys.
  • Resistive index ratio (RIR) and delta RI were calculated for comparative analysis.

Main Results:

  • Infants with obstructed hydronephrosis showed a significantly higher mean RI in the affected kidney (0.77 ± 0.04) compared to the healthy kidney (0.69 ± 0.02) (p < 0.001).
  • This significant difference in RI was not observed in infants with non-obstructive dilatation.
  • Absolute RI values alone were insufficient; comparative indices (RIR, delta RI) were more informative.

Conclusions:

  • Renal Doppler ultrasonography, particularly comparative RI measurements (RIR, delta RI), is valuable for distinguishing between obstructed and non-obstructed unilateral hydronephrosis in infants.
  • This non-invasive technique aids in the diagnostic workup and management decisions for pediatric hydronephrosis.

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