List of abbreviations
FiO2, inspired oxygen fraction; HFNC, high-flow nasal cannula therapy; NPPE, negative pressure pulmonary edema; OSA, obstructive sleep apnea; PaO2, arterial oxygen tension; PD, Parkinson’s disease; PEEP, positive end-expiratory pressure; SpO2, arterial oxygen saturation; UAO, upper airway obstruction