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A 2-year-old male is brought to your emergency department after an episode of choking followed by one episode of vomiting 20 minutes prior to presentation. He had been playing with a small toy car in his mouth at the time. He is currently sitting on his father's lap in a chair beside the paediatric resus bay bed.

1. List (4) features that suggest a mild obstruction of the upper airway. 4 marks

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2. List (4) features that would suggest a moderate obstruction to the upper airway. 4 marks

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3. List (4) features you would look for in the chest X-ray apart from a potential radio-opaque foreign body. 4 marks

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