Stridor in Adult

Stridor: high-pitched musical sound from upper airway obstruction. Red flags: tripoding, drooling, voice change, accessory muscle use, hypoxia, hypercapnia, exhaustion, ALOC. Differentials: anaphylaxis, angioedema (ACE-I, hereditary), epiglottitis (adult — fever, drooling, sore throat), foreign body, laryngeal tumour, bilateral vocal cord paralysis, tracheal stenosis (post-intubation, GPA, sarcoid), deep neck infection (Ludwig's, retropharyngeal abscess), inhalation injury / burn, goitre with retrosternal extension, traumatic.