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Hyperkalaemia — RCPSC EM MCQ

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EasyCardiovascular emergenciesHyperkalaemiaRCPSC EM

A 70-year-old dialysis patient misses two sessions and presents weak and nauseated. Triage ECG shows peaked T waves and widening QRS complexes. Potassium is 7.3 mmol/L and the nurse asks what medication should be given first. What is the most likely diagnosis?

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Correct answer: A — Severe hyperkalaemia

Severe hyperkalaemia is correct: the clues indicate Hyperkalaemia and this option addresses the immediate ED priority. The distractors delay care, target a less likely problem, or are unsafe in this physiology.

Reference: ACLS principles; nephrology emergency practice