Question: 3. An 82 -year-old female presents to the vascular laboratory with elevated serum creatinine and blood ure ninugm levels. During renal artery duplex examination, velocities from the renal arteries remain within nommal limin. Upoo evaluation of the renal parenchyma, peak systolic velocities are 25 cm/s with end-diastolic velocities of 6 cm/c. bilaterally.