“…During RDU examination, synthetic judgment of multiple parameters, including PSV, RAR, renal interlobar velocity ratio (RIR), AT, and RI, are essential to correct diagnosis. For example, Zachrissonet al [27] reported that RAR is a more sensitive criterion than traditional RDU criteria when screening patients with clinical suspicion of RAS. Additionally, factors other than RAS, such as left heart insufficiency, mitral valve disease, and aortic disease, could affect the results of PSV and RAR.…”