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NBME 20 Answers

nbme20/Block 1/Question#18

A 36-year-old man comes to the physician because he ...

Urine output: increased; Urine potassium: increased

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submitted by hayayah(244),

The tubes are catheters put in for urine to flow into a bag. So urine output is going to increase. The patient is also hyperkalemic. Aldosterone responds to hyperkalemia by increasing K+ excretion.

Hyperkalemia will stimulate aldosterone secretion even if renin is suppressed due to his hypertension. Although Na+ will be reabsorbed, this will be transient (should resolve once the potassium levels normalized) and since his urine output will most likely return to normal, his blood pressure should also normalize.