A 31-year-old man presents to the office with concerns about his heart. Three months ago, his father died of a myocardial infarction at age 58 years. He states that since the death of his father, he has experienced episodes in which his heart will start racing, causing him to feel short of breath, dizzy, and nauseous. He is afraid that he will die during these episodes. Findings from a physical examination, electrocardiogram, Holter monitoring, echocardiogram, and complete blood count are normal. Serum electrolyte level, troponin level, and thyroid function studies are all within normal limits. Which one of the following options is the most appropriate?
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