Parkinson disease and dementia with Lewy bodies Quiz: Ace Your Exams
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A 65-year-old man presents to the primary care clinic for evaluation of a tremor. For the past six months, a low-amplitude tremor of the right hand has been present when relaxing. Past medical history is significant for hypertension, for which lisinopril is taken. The patient does not consume caffeine or alcohol. Temperature is 37.0°C (98.6°F), pulse is 75/min, respirations are 12/min, and blood pressure is 122/78 mmHg. On exam, the patient is alert but has a flattened affect. Movements are slow, and there is a pill-rolling tremor of the right hand at rest and cogwheel rigidity of the right elbow. Laboratory studies reveal normal liver and thyroid function. Which of the following interventions is most likely to confirm the diagnosis?
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