A 75-year-old white man presents for a health maintenance checkup. The patient has had stable hypertension but has not seen a physician in more than 2 years. He denies any problems. He lives alone. He takes an aspirin a day and is compliant with his blood pressure medicine (hydrochlorothiazide). His son fears that his father is either experiencing a stroke or getting Alzheimer’s disease because he is having trouble understanding what family members are saying, especially during social events. The son reported no noticeable for weakness or gait impairment. On physical examination, the patient’s BP was 130/80. Examination of the ears showed no cerumen impaction and normal tympanic membranes. His general examination is normal. Laboratory studies, including thyroid-stimulating hormone (TSH) are normal. Answer the following questions: 1. What is the most likely diagnosis? 2. What is the next step?