au-amc MCQ (SBA): Obstructive sleep apnoea

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A 56-year-old obese man complains of loud snoring, witnessed apnoeas and unrefreshing sleep. He often feels sleepy while driving. BMI is 34 kg/m², neck circumference 45 cm and blood pressure 150/92 mmHg. Examination is otherwise normal. What is the most appropriate initial investigation to confirm the suspected diagnosis?

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