RESUMO
Urinary stone is one of the most common cause ofureteral obstruction. Degree of obstruction has an important role in choosing time and method of treatment. The aim of this cross-sectional study is comparison between Color Doppler Ultrasound and Intravenous Urogram in diagnosis ofureteral obstruction in patients with ureteral stone. 35 patients with unilateral renal colic were studied from October 2004 to June 2005. In all patients the presence of stone in the ureter was confirmed by Sonography. Mean age was 36.9 +/- 9.1 years. After analgesia and determination of serum creatinin level, color Doppler ultrasound [CDU] was done with semi-distended bladder. Number, velocity, and duration of ureteral jets were observed in five minutes, bilaterally. Immediately after CDU, the patients were transferred to the next room to perform standard IVU. All data was recorded and analyzed with statistical methods.%71.4 of patients were male and 28% were female. Mean serum creatinine was 0.9 +/- 0.18 mg/dl. In all patients with complete ureteral obstruction in IVU, ureteral jets were diminished [42.1%] or absent [57.9%] in CDU. In patients with partial obstruction in IVU, diminished jets in CDU were noted in 86.7%; and only in 2 patients [13.3%] normal jets were seen. Number of jets in one minute was 0.84 +/- 1.46 in patients with complete obstruction, and 5.18 +/- 3.4 in partial obstruction [P<0.001]. There was a significant difference in velocity and duration of jets between complete and partial obstruction [P<0.01 and P<0.001 respectively]. The number, velocity, and duration of the jets in the normal side was not significantly different between the two groups of patients [P=0.31, P=0.51, and P=0.27 respectively]. This study showed that CDU can determine ureteral obstruction in renal colic patients in most cases. It is a safe, fast, and noninvasive test. CDU of ureteral jets is recommended as a functional test in renal colic patients