A 62-year-old man with a 10-year history of hypertension presents with resistant hypertension despite being on three antihypertensive medications including a diuretic. Duplex renal Doppler ultrasound is performed. The structure marked **A** in the diagram shows a peak systolic velocity of 240 cm/s at the renal artery stenosis. Based on this finding, which of the following statements about the hemodynamic significance of this stenosis is most accurate?
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