A 58-year-old man has had a myocardial infarction (MI), has…

A 58-year-old man has had a myocardial infarction (MI), has begun rehabilitation, and is ready for discharge. He is given a prescription for metoprolol (Lopressor) and becomes upset after reading the patient education pamphlet. I don’t have high blood pressure why did my doctor give me this medicine? Which explanation by the nurse is correct?