au-amc MCQ (SBA): Obstructive sleep apnoea

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A 60-year-old man with obesity and loud snoring is referred for assessment. His partner reports witnessed apnoeas at night and excessive daytime sleepiness. What is the most appropriate first-line investigation to confirm the diagnosis of obstructive sleep apnoea?

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au-amc MCQ: Obstructive sleep apnoea — Answer & Explanation | iatroX