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Renal Venous Doppler Study in Obstructive Uropathy.

Bala Murali Krishna Vadana1, Ashirwad Pasumarthy2, Neelima Penumalli3

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Summary

Renal venous Doppler ultrasound reliably diagnoses acute obstructive uropathy by showing a lower venous impedance index on the obstructed side. This technique aids in identifying urinary tract obstruction when combined with other ultrasound methods.

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End diastolic velocityImpedance indexNon obstructive kidneysPeak systolic velocityResistive indexUltrasound

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Area of Science:

  • Radiology
  • Nephrology
  • Urology

Background:

  • Obstructive uropathy frequently causes abdominal pain, necessitating accurate diagnosis of the cause and obstruction level.
  • While B-mode ultrasound and arterial Doppler are standard, early-stage obstructive uropathy can be challenging to detect.
  • Conventional radiographs are also used in diagnosis.

Purpose of the Study:

  • To assess the diagnostic accuracy of renal venous Doppler ultrasound for acute obstructive uropathy.
  • To evaluate its utility alone and in conjunction with arterial Doppler of interlobar arteries.
  • To address the limited data on renal venous Doppler in the Indian population.

Main Methods:

  • Fifty patients with suspected obstructive uropathy were studied.
  • The obstructed kidney was compared with the non-obstructed kidney in the same patient.
  • Fifty healthy individuals served as controls.

Main Results:

  • The mean venous impedance index was significantly lower in obstructed kidneys (0.26 ± 0.07) compared to unobstructed kidneys (0.41 ± 0.08).
  • No statistically significant difference was observed in the mean arterial Resistivity Index (RI) between groups.
  • Renal venous Doppler demonstrated a significant difference in diagnosing obstruction.

Conclusions:

  • Renal venous Doppler ultrasound is a dependable tool for diagnosing acute obstructive uropathy.
  • While its standalone use requires further investigation, it is valuable when combined with B-mode ultrasound and arterial Doppler.
  • This study provides insights into renal venous Doppler utility in the Indian population.