ukmla MCQ (SBA): Post-operative Delirium

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A 78-year-year-old man undergoes elective hip replacement surgery. Post-operatively, he develops confusion, agitation, visual hallucinations, and fluctuating levels of consciousness, worse in the evenings. His observations are stable, and routine blood tests including electrolytes, FBC, CRP, and calcium are normal. What is the most likely diagnosis?

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