Physiological Effect High-flow Tracheal Oxygen on Viscosity of Airway Mucus and Respiratory Effort in Patients Weaning from Invasive Mechanical Ventilation

All patients are subject to both oxygen therapy groups in this randomized cross-over study. Study measurements are performed during several different disconnection sessions. Disconnection sessions can either be short (\<90 min) or long (12 hours). Both short and long disconnection sessions are performed twice; once with conventional oxygen, and once with high-flow tracheal oxygen as respiratory support.