S: severity: parents subjective impression regarding the severity of the obstruction
P: progression of the obstruction over time
E: eating or feeding difficulties, aspiration, and failure to thrive
C: cyanotic episodes, apparent life-threatening events
S: sleep—obstruction so severe that retractions occur even during sleep
R: radiology—specific radiologic abnormalities
Source: Hammer J “Acquired upper airway obstruction”, Paediatr Respir Rev 5:25–33, (2004)
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