Suspected OSA for Total Hip Replacement

You are reviewing a 72-year-old woman in the anaesthetic bay of a metropolitan hospital. She is scheduled for an elective left total hip replacement and was previously assessed in the pre-anaesthetic clinic two months ago. Two years prior she underwent a right total knee replacement, which was complicated by a 48-hour High Dependency Admission as she was "slow to wake up" and required supplemental oxygen therapy. Medical history: Hypertension Obesity (body mass index 41 kg/m2) Medications: Atorvastatin 20 mg daily Candesartan/hydrochlorothiazide 16/12.5 mg daily