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Related Experiment Videos

Distinction between obstructive and nonobstructive pyelocaliectasis with duplex Doppler sonography.

J F Platt1, J M Rubin, J H Ellis

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

AJR. American Journal of Roentgenology
|November 1, 1989
PubMed
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Duplex Doppler sonography effectively distinguishes between obstructive and nonobstructive pyelocaliectasis using the resistive index (RI). An RI of 0.70 accurately identifies renal obstruction, improving diagnostic accuracy.

Area of Science:

  • Nephrology
  • Radiology
  • Medical Imaging

Background:

  • Renal obstruction increases renal vascular resistance, suggesting changes in Doppler waveforms.
  • Distinguishing obstructive from non-obstructive pyelocaliectasis is crucial for patient management.

Purpose of the Study:

  • To evaluate the diagnostic value of the resistive index (RI) from duplex Doppler waveforms in differentiating obstructive from non-obstructive pyelocaliectasis.

Main Methods:

  • Prospective duplex Doppler sonography in 70 kidneys with pyelocaliectasis.
  • Obstruction confirmed by interventional methods or imaging (CT, urography, surgery).
  • Resistive index (RI) calculated as (peak systolic - minimum diastolic) / peak systolic frequency shift.

Main Results:

Related Experiment Videos

  • Significant difference in mean RI between obstructed (0.77) and non-obstructed (0.63) dilated kidneys (p < .01).
  • An RI cutoff of 0.70 demonstrated 92% sensitivity, 88% specificity, and 90% accuracy for obstruction.
  • Normal kidneys had RI < 0.70; over half of non-dilated diseased kidneys had RI >= 0.70.

Conclusions:

  • Duplex Doppler sonography with RI measurement enhances accuracy in diagnosing renal obstruction noninvasively.
  • This technique is valuable when a dilated collecting system is identified, improving diagnostic specificity.