The finding would most likely lead you to suspect an upper airway obstruction in a 3-year-old child is Increased inspiratory effort and retractions.
Upper airway obstruction is any problem that difficult gas exchange in a person and therefore he/she cannot breathe.
The upper airways include the nose, nasal cavity, and throat larynx, which may be in this case are narrowed and thereby compromise ventilation.
In conclusion, the finding would most likely lead you to suspect an upper airway obstruction in a 3-year-old child is Increased inspiratory effort and retractions.
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