Q. A 62 year-old man with a past medical history of diabetes mellitus, hypertension, and prior TIA presents with sudden onset of dysarthria, left lower face weakness, left upper extremity weakness greater than left lower extremity weakness, and some odd sensation on the left side of the body. It resolves within 20 minutes. Noncontrast head CT is unremarkable. CT angiogram demonstrates carotid stenosis of 50% on the left and 75% on the right. Which of the following is true regarding his management?