This patient was a 74-year-old man with a history of obesity (BMI 36.9 kg/m²).  He had been treated with continuous positive airway pressure (CPAP) for obstructive sleep apnea (OSA) for the previous 5 years; his adherence to treatment was good (>6 h/night on CPAP), and his results were also good, with very low AHI and residual events.  He also had hypertension and diabetes, but his diabetes was more or less under control, with an HbA1c of 7.3%.  His hypertension was being treated with a combination of three medications: a thiazide diuretic, an angiotensin-converting enzyme (ACE) inhibitor, and a beta-blocker.  His last medical event was an emergency admission for inaugural pulmonary edema due to myocardial infarction and unstable angina, and at that time he had a reduced left ventricular ejection fraction (LVEF) of 20%.