Table 1

Data collection and follow-up

	Pre-op	Intra-op	Post-op 1 hour	Post-op 3 hours	Post-op 12 hours	POD 1	Follow-up once a day until POD 7
Informed consent	×
Demographic data	×
Airway assessment*	×
Artificial airway management†		×
Intraoperative airway-related data‡		×
Tracheal tube–tongue pressure		×
Intraoperative intake and output volume		×
Visible intraoral injury before extubation		×
Oedema of the head and face		×	×	×	×	×	×
Postoperative laryngopharyngeal discomfort			×	×	×	×	×
Perioperative glucocorticoid use		×	×	×	×	×	×
Water intake			×	×	×	×	×
Solid food intake			×	×	×	×	×
Airway-related events§			×	×	×	×	×
Patient satisfaction (1–10/10)			×	×	×	×	×

*Preoperative airway assessment includes neck circumference, Mallampati classification, mouth opening, nail–chin distance and mandibular angle.
†Artificial airway management includes tracheal tube type, intubation device, and ventilation parameters.
‡Intraoperative airway-related data include patient position and maintenance time, duration of mechanical ventilation and endotracheal tube intubation, and special events, such as tube kinking, abnormal airway pressure and abnormal ventilation.
§Airway-related events include bronchospasm, aspiration, secondary intubation, respiratory tract infection, respiratory insufficiency and prolonged oxygen therapy.
POD, postoperative day.