There appears to be some controversy about this issue. One camp maintains that the resistive index (RI) is an insensitive tool for differentiating obstructive and nonobstructive calculi in patients with acute renal colic. The opposing view is that RI can distinguish obstructed and unobstructed kidneys (with an RI> 0.7 seen in the symptomatic kidney).
References
- Gurel S, et al. Correlation Between the Renal Resistive Index (RI) and Nonenhanced Computed Tomography in Acute Renal Colic. J Ultrasound Med. 2006; 25:1113-1120.
- Onur MR, et al. Role of resistive index in renal colic. Urol Res. 2007;35(6):307-12.
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