- Tracheobronchitis and pneumonia after randomization. Safety considerations: The main safety concern is the risk of aspiration. First all patients will be categorized in three steps using the drink test: low risk patients (normal drink test) with no other specific interventions; moderate risk (abnormal drink test) the risk of aspiration study will include a videolaryngoscopy; high risk patients will be excluded from the study. In all patients a high flow-humidified oxygen-air mixture system will be connected trough the external cannula.