A 68-year-old man with hypertension, type 2 diabetes, and 40-pack-year smoking history presents with three episodes of transient monocular vision loss in the right eye over two weeks, each lasting 5–10 minutes and resolving spontaneously. On dilated fundus examination, the structure marked **A** is identified—a bright refractile yellow-orange crystalline plaque lodged at an arteriolar bifurcation. Carotid auscultation reveals a right-sided bruit, and urgent carotid Doppler ultrasound demonstrates 80% stenosis of the right internal carotid artery. Which of the following is the most appropriate immediate management priority for this patient?
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