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Freddy, a 9-week-old previously healthy boy born at 37 weeks’ gestational age, presented to the emergency department (ED) by emergency medical services after an event at home in which he had decreased responsiveness, blue discoloration around his mouth, irregular breathing, and poor muscle tone. He has now returned to baseline, and the physician in the ED notes that Freddy has normal vital signs and a normal physical examination. The ED physician places Freddy on a pulse oximeter and obtains an electrocardiogram (ECG) and chest radiograph. The results of these studies are reassuring, but the physician calls you because she is concerned Freddy will need further observation.

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