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Post-renal obstructive uropathy — MCCQE Part 1 MCQ

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ModerateUrinary IncontinencePost-renal obstructive uropathyMCCQE Part 1

A 78-year-old man with BPH has acute urinary retention. Catheterised with 1200 mL drained. Creatinine was 90 now 280, improves to 110 after 3 days of catheter. Which mechanism describes his renal impairment?

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Correct answer: C — Post-renal obstructive uropathy

Elevated creatinine rapidly improving after catheterisation = post-renal AKI from obstruction. Monitor for post-obstructive diuresis. Bilateral obstruction or bladder outlet obstruction required for AKI.

Reference: CUA BPH Guidelines