USMLE Step 2 Quiz
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CARDIOVASCULAR
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A 65-year-old man was admitted 4 days ago for an extensive anterior MI treated with a stent to the left anterior descending artery. His troponin I level peaked at 55 ng/mL (normal <0.04 ng/mL) and has been trending downward. Today, he develops a new episode of crushing substernal chest pain. An ECG shows new ST depressions in the lateral leads.
Which of the following laboratory tests would be most useful for diagnosing a reinfarction at this time?
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