Respiratory failure (pediatrics) Quiz: Ace Your Exams
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A 5-year-old boy with a past medical history of asthma presents to the emergency department for evaluation of shortness of breath. He was playing at a party and started wheezing. The family recently moved to town and has not refilled his asthma medication. The patient has not had fever, congestion, or rhinorrhea. He has no surgical history, and family history is positive for asthma. Temperature is 37° C (98.6° F), pulse is 120/min, respirations are 45/min, blood pressure is 92/53 mm Hg, and oxygen saturation is 80% on room air. Subcostal retractions are noted with diffuse expiratory wheezing. Heart sounds are normal. Chest X-ray shows hyperinflation. Which of the following diagnostic studies should be obtained next?
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