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Related Experiment Videos

Duplex Doppler evaluation of native kidney dysfunction: obstructive and nonobstructive disease.

J F Platt1

  • 1Department of Radiology, University of Michigan Medical Center, Ann Arbor 48109-0030.

AJR. American Journal of Roentgenology
|May 1, 1992
PubMed
Summary

Intrarenal duplex Doppler sonography assesses kidney vascular resistance. Elevated resistive index suggests obstruction, but nonobstructive conditions can also cause this, indicating its limitations in diagnosing kidney disease.

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Area of Science:

  • Nephrology
  • Radiology
  • Vascular Ultrasound

Background:

  • Intrarenal duplex Doppler sonography offers physiologic insights into renal vascular resistance.
  • A normal intrarenal resistive index (RI) upper limit is suggested around 0.70.
  • Urinary obstruction causes prompt RI elevation, distinguishing it from nonobstructive dilatation.

Purpose of the Study:

  • To evaluate the utility of Doppler imaging in assessing dilated, potentially obstructed kidneys.
  • To determine if intrarenal Doppler sonography can noninvasively suggest the significance of partial urinary obstruction.
  • To explore the role of Doppler sonography in managing renal medical diseases.

Main Methods:

  • Intrarenal duplex Doppler sonography was employed to measure renal vascular resistance.

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  • Resistive index (RI) values were analyzed in relation to urinary obstruction and nonobstructive renal diseases.
  • Correlation with renal biopsy findings and creatinine levels was considered.

    • Main Results:

    • Complete or significant partial urinary obstruction leads to prompt RI elevation.
    • Nonobstructive renal disease can also elevate the RI, highlighting limitations in specificity.
    • Doppler sonography is useful for monitoring known RI-elevating renal diseases and differentiating between conditions with varying Doppler changes.

    Conclusions:

    • Intrarenal Doppler sonography is valuable for evaluating obstructed kidneys and assessing partial obstruction significance.
    • While not a replacement for renal biopsy, it provides unique noninvasive information on renal arterial resistance.
    • Its application is most useful in monitoring specific renal diseases and differentiating between conditions based on Doppler patterns.