A 62-year-old woman presents 4 days after an acute myocardial infarction with persistent chest pain, fever (38.5°C), and a new pericardial friction rub. She is suspected to have post-infarction pericarditis (Dressler syndrome). Which investigation is most specific for confirming acute myocardial necrosis and differentiating it from other causes of pericarditis?

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