Evaluation of renal artery stenosis with hemodynamic parameters of Doppler sonography

ObjectiveThe purpose of this study was to determine the values of the hemodynamic parameters of Doppler sonography in the diagnosis of renal artery stenosis (RAS) (diameter reduction ≥50%) and to investigate their possible influencing factors.MethodsFive Doppler parameters, including renal peak systolic velocity (RPSV), renal-aortic ratio (RAR), renal-renal ratio (RRR), renal-segmental ratio (RSR), and renal-interlobar ratio (RIR), were measured in 81 patients before arteriography. Arteries with ≥50% diameter reduction were considered stenosed at renal arteriography. Receiver operating characteristic curve analysis was performed to determine the optimal parameters. The sensitivity, specificity, positive and negative predictive values, and accuracy at various threshold values were calculated.ResultsSixteen accessory renal arteries (15 normal, one mild stenosis) were identified at arteriography. Of the 153 main renal arteries demonstrated at arteriography, 79 were normal or demonstrated stenosis