A nurse is assessing a patient with chest pain. Which action is most appropriate to determine if the patient is experiencing a myocardial infarction?

A. Perform a 12 lead EKG – A 12-lead electrocardiogram (EKG/ECG) is the most appropriate and immediate diagnostic tool to assess for myocardial infarction (MI). It can detect ST segment changes, T wave inversions, or Q waves that indicate ischemia or infarction. B. Check the patient's blood pressure – While important for overall assessment, blood pressure alone cannot confirm or rule out an MI. C. Auscultate the patient's heart sounds – This may reveal abnormalities (e.g., S3, murmurs), but it is not diagnostic for MI. D. Determine if the pain radiates to the left arm – Radiation of pain is a classic symptom of MI, but it is subjective and not sufficient to confirm the diagnosis without further diagnostic tests like an EKG.