Closed Loop Oxygen Control in Chronic Obstructive Pulmonary Disease (COPD) Patients Treated With Nasal High Flow in the Hospital

Inclusion Criteria: * Has cognitive ability to provide informed consent * Aged 22 years or older * Hospitalized with hypoxemia/respiratory distress * Diagnosis of COPD * Candidate for/currently prescribed nasal high flow (flow rate of at least 25 L/min) with supplemental oxygen, as assessed by the investigator * Expected duration of oxygen and nasal high flow therapy \>24 hours (not necessarily continuous) Exclusion Criteria: * Receiving Non Invasive Ventilation (NIV) or indicated for NIV as per European Respiratory Society /American Thoracic Society guidelines * Hemodynamic instability (systolic blood pressure \<90mmHg or requirement for vasopressor or inotropic support) * Patient receiving end of life care * Nasal or facial conditions precluding use of nasal high flow * Pregnancy or breastfeeding * Cognitive impairment or impaired consciousness precluding informed consent * Unsuitable for adhesive finger pulse oximetry, as assessed by the investigator * Any other condition which, at the investigator's discretion, is believed to present a safety risk to the patient if included * The presence of any active comorbidities that affect the patient's condition importantly in the next 30 days, as assessed by the investigator * Has already participated in this clinical trial