Doppler sonography in the diagnosis of urinary tract obstruction by stone

✍ Scribed by Nevbahar Akçar; I. Ragıp Özkan; Baki Adapınar; Tamer Kaya

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 217 KB
• Volume: 32
• Category: Article
• ISSN: 0091-2751
• DOI: 10.1002/jcu.20032

✦ Synopsis

Abstract

Purpose

This study was conducted to evaluate the accuracy of Doppler sonography in renal colic due to obstruction and to assess whether the resistance index (RI) and interrenal RI difference (ΔRI) are time‐dependent parameters.

Subjects and Methods

Obstructed and unobstructed contralateral kidneys in 28 patients with renal colic and normal kidneys in 27 control subjects were prospectively evaluated with Doppler sonography. Mean RI, mean ΔRI, and duration of pain were evaluated. Statistical analysis was done using paired and independent t‐tests.

Results

Mean RIs of the control‐group, obstructed, and contralateral kidneys were 0.60, 0.71, and 0.61, respectively; mean ΔRI values of the obstructed and control‐group kidneys were 0.10 and 0.03, respectively. Differences in mean RI between obstructed and contralateral or control‐group kidneys were statistically significant (p < 0.001). There was a statistically significant difference in ΔRI between patients and controls (p < 0.001). The difference between the RI values of kidneys with low‐grade (0.70) and high‐grade obstructions (0.72) was not statistically significant. The difference between the ΔRI values of kidneys with low‐grade (0.08) and high‐grade obstructions (0.13) was statistically significant (p < 0.05). Differences in the mean RI and mean ΔRI values between 3 groups of patients categorized according to the duration of pain were not statistically significant.

Conclusions

Along with gray‐scale sonography and intravenous urography, Doppler sonography can be used in the evaluation of renal obstruction. RI and ΔRI are not time‐dependent parameters. © 2004 Wiley Periodicals, Inc. J Clin Ultrasound 32:286–293, 2004