Table 5.

Definition for minor and major laryngeal edema

Minor laryngeal edema:	the presence of stridor (defined as an audible high-pitched inspiratory wheeze) and signs of respiratory distress. Signs of respiratory distress are a prolonged inspiratory phase and recruitment of accessory respiratory muscles as seen by subcostal, suprasternal or intercostal retraction.
Major laryngeal edema:	respiratory distress needing tracheal intubation secondary to upper airway obstruction confirmed by direct or video laryngoscopy.

Edited from Darmon and colleagues [4] and Francois and colleagues [6].