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Role of resistive index in renal colic

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Abstract

We studied the role of duplex Doppler ultrasonography in the diagnosis of renal obstruction caused by ureteral calculi. Using duplex Doppler sonography, we evaluated the intrarenal hemodynamics of 27 patients who presented to the emergency department with renal colic. We performed Doppler ultrasonography on patients in whom US did not reveal any pathology causing renal colic and calculated and compared mean RI values of normal and obstructed kidneys and ΔRI values of each group. Threshold levels for the diagnosis of urinary tract obstruction (mean RI ≥ 0.70 and ΔRI ≥ 0.08) were used to determine the sensitivity and specificity of Doppler sonography for the diagnosis of urinary tract obstruction. Patients were investigated for revealing calculi diagnosis either by stone excretion history, intravenous pyelography or non contrast enhanced urinary computed tomography. A total of 162 intrarenal arterial Doppler recordings were made on 54 kidneys. Of the 16 patients with urinary obstruction, 11 (68%) had sonographic evidence of pelvicalyceal dilatation. The mean RI of the 16 obstructed and 11 unobstructed kidneys was 0.69 ± 0.04 and 0.61 ± 0.06 (mean ± standard deviation), respectively. The difference between the mean RI values for each group was statistically significant (P < 0.05). Mean RI values of the contralateral kidneys in the obstructed group and unobstructed group were 0.61 ± 0.03 and 0.59 ± 0.05, respectively. Also ΔRI value (0.07 ± 0.02) of obstructed kidney group was statistically higher than the ΔRI value (0.01 ± 0.03) of the unobstructed group (P < 0.05). The mean RI of the 16 obstructed kidneys (0.69 ± 0.04) was significantly greater than that of the 16 unobstructed contralateral kidneys (0.61 ± 0.03) (P < 0.05). This study supplements the existing evidence that, in acutely obstructed kidneys, renal Doppler recording can demonstrate altered renal perfusion before pelvicalyceal system dilatation and distinguish obstructed and unobstructed kidneys evaluated with suspicion of renal colic.

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Authors and Affiliations

  1. Kovancılar Government Hospital, Department of Radiology, Kovancılar, Elazig, Turkey

    Mehmet Ruhi Onur

  2. Faculty of Medicine, Department of Radiology, Akdeniz University, Antalya, Turkey

    Metin Cubuk & Gokhan Arslan

  3. Faculty of Medicine, Department of Radiology, Gaziantep University, Gaziantep, Turkey

    Cagatay Andic

  4. Faculty of Medicine, Department of Emergency Medicine, Akdeniz University, Antalya, Turkey

    Mutlu Kartal

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  1. Mehmet Ruhi Onur
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  2. Metin Cubuk
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  3. Cagatay Andic
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  4. Mutlu Kartal
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  5. Gokhan Arslan
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Correspondence to Mehmet Ruhi Onur.

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Onur, M.R., Cubuk, M., Andic, C. et al. Role of resistive index in renal colic. Urol Res 35, 307–312 (2007). https://doi.org/10.1007/s00240-007-0116-2

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  • DOI: https://doi.org/10.1007/s00240-007-0116-2

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