Figure 1 . Tracheostomy time-out. This is performed immediately after the general surgical time-out is completed. The middle of the checklist highlighted in light magenta background involves intraoperative safety measures which should be repeated when the surgical team is close to entering the airway. PPE: personal protective equipment. ETT: endotracheal tube. FiO2: fraction of inspired oxygen via anesthesia circuit. HME: heat moisture exchanger.