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A 45-year-old otherwise healthy man presents to the emergency department with an urticarial rash and vomiting after ingesting shellfish 1 hour prior. He is placed in a resuscitation room and epinephrine is administered intramuscularly. Shortly thereafter he develops chest pain and his ECG shows ST elevation in the anterolateral leads. He has no cardiac history, nor any risk factors. What diagnosis does this patient likely have?