Answer :
Final answer:
The most appropriate next diagnostic study for a 52-year-old man with substernal chest pain is a coronary angiography.
Explanation:
The most appropriate next diagnostic study for a 52-year-old man presenting with substernal chest pain is a coronary angiography. This procedure uses contrast dye to visualize the blood vessels of the heart and can identify any blockages or narrowing in the coronary arteries, which can help diagnose acute coronary syndrome or a heart attack. Other diagnostic studies that may be considered include a stress test or a cardiac CT scan.
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