A 67-year-old woman with a history of hypertension and type 2 diabetes presents to the emergency department with 3 hours of epigastric discomfort, nausea, and diaphoresis. She denies chest pain or shortness of breath. Her blood pressure is 148/92 mmHg, heart rate is 98 bpm, and oxygen saturation is 96% on room air. Physical examination is unremarkable. An ECG is obtained and shown above. The ECG demonstrates ST-segment elevations of 2–3 mm in leads II, III, and aVF, with reciprocal ST-segment depressions in leads I and aVL, and no ST changes in the precordial leads. Which of the following is the most appropriate immediate next step in management?

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Cardiac biomarkers
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