Final answer:
Signs and symptoms of a myocardial infarction include angina pectoris, chest pain, dyspnea, and elevated blood markers like creatine kinase MB, which can be confirmed using an ECG.
Explanation:
Signs and symptoms that can indicate a myocardial infarction (MI) commonly known as a heart attack include sudden pain beneath the sternum called angina pectoris, which may radiate down the left arm. Other symptoms include dyspnea, palpitations, nausea, vomiting, diaphoresis, anxiety, and syncope. Blood tests like elevated creatine kinase MB and cardiac troponin levels can also indicate an MI, and an ECG can confirm it.
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