A 63-Year-Old Man with Long-Standing Hypertension Has Undergone Multiple Changes

A 63-year-old man with long-standing hypertension has undergone multiple changes in his antihypertensive regimen over the years with only minimal improvement in his blood pressure.  A CT study of his thoracolumbar spine is performed for evaluation of chronic back pain, and the study incidentally reveals a small right kidney.  Angiography demonstrates atherosclerotic narrowing of the right renal artery.  The left renal artery is intact.  You conclude that the flow in the right-sided artery is decreased by a factor of 16 compared to the left.  By what percentage has the radius of the lumen been reduced?

A) 25%
B) 33%
C) 50%
D) 75%
E) 90%

Correct Answer:

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