RecruitingDevice studyClosed Loop Oxygen Control in Chronic Obstructive Pulmonary Disease (COPD) Patients Treated With Nasal High Flow in the HospitalThe trial aims to evaluate whether the Airvo 3 device in OptiO2 mode can maintain patients' SpO2 levels within the target range better than manual oxygen titration in hospitalized COPD patients with hypoxemia/respiratory distress.