58-year-old Man in Medicine / Internal Medicine — 58yo Man | Critical Care | SMLE Q#18591
SMLE Question #18591
Medicine / Internal Medicine
Critical Care
Objective: OBJ-CC-ELEC-001
Last updated: February 2026
A 58-year-old man is on postoperative day 6 after a colectomy. He has had poor oral intake since surgery and reports progressive generalized weakness, fatigue, and intermittent palpitations. Basic labs show marked hypokalaemia. Which assessment is most critical to perform immediately?
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