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Postoperative hypovolemia — USMLE Step 3 MCQ

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EasySurgery (post-operative, follow-up)Postoperative hypovolemiaUSMLE Step 3

A 63-year-old man is in the recovery room after colon surgery. He has oliguria, tachycardia, dry mucous membranes, and orthostatic hypotension. Urine sodium is low. Which of the following is the most appropriate at this time?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Administer isotonic intravenous fluids

Early postoperative oliguria with hypovolemia findings and low urine sodium is managed with isotonic fluid resuscitation.

Reference: Perioperative care guidance; USMLE Step 3 Content Outline