High resistance Doppler spectral waveforms recorded throughout the renal medulla and cortex suggest

Question

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When renal disorders affect the parenchyma of the kidney, an associated accumulation of interstitial fluid, endovasculitis, and/or peritubular necrosis often are seen. These conditions can cause swelling and increased pressure within the organ and decreased vascular compliance. The end result is increased vascular resistance. As impedance to arterial inflow increases (increased vascular resistance), diastolic flow decreases. Answers "a" and "b" can be eliminated, because both would result in decreased resistance distal to the stenosis. Accessory renal arteries would have no impact on the level of distal vascular resistance unless they were severely stenosed or occluded.

High Resistance Doppler Spectral Waveforms Recorded Throughout the Renal Medulla