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URTI in infants/toddlers (6/12-3yr) esp in autumn
Stridor - laryngeal oedema and secretions (avoid examining throat as can precipitate airway obstruction) + barking cough (worse at night), fever, coryza
Mostly parainfluenza virus

''Grade severity''
||''Mild''|''Moderate''|''Severe''|
|Barking cough|Occassional|Frequent|Frequent|
|Stridor at rest|none|easily audible|prominent insp|
|Recession|None or mild|suprasternal and sternal|Marked|
|Distress|Happy, eat, drink, play|Little|significant|
|Tachcardia|No|No|with inc hypoxaemia|

''Admit if ...''
moderate or severe
under 6/12
known upper ariway abN (eg Downs)
uncertainty about diagnosis

''DD''
acute epiglottitis, 
bacterial tracheitis, 
peritonsillar abscess, 
foreign body inhalation

''Mx''
Oral Dexamethasone (0.15mg/kg stat)
O2 and nebulised adrenaline if severe