The renal resistive index as a predictor of acute hydronephrosis in patients with renal colic

Purpose: The objective of this study was to determine whether the renal resistive index (RI) can predict hydronephrosis in patients with renal colic (RC) and whether or not its performance is time-dependent. Materials and methods: The study population was composed of 54 patients admitted for unilateral RC. At the time of the first observation (time point I, tpI), each patient underwent routine examinations, abdominal ultrasonography, and renal color Doppler ultrasound (CDUS) with measurement of the RI. The two imaging studies were repeated 6, 12, 18, 24, 36, and 48h later (tpII, tpIII, tpIV, tpV, tpVI, tpVII). I…