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15116 Surgery

A 82-year-old female presented with history of loss of vision in right eye for about 15 minutes and it cleared up. She has a history of diabetes and hypertension. She had which showed old infarct on right side. Carotid duplex showed that patient had 99% carotid artery stenosis. Which one of the following statements is TRUE?

A60%chance that extra cranial carotid artery stenosis is the cause of transient ischemic attack (TIA)
BIt is always due to platelet emboli.
C25% may be intracranial bleed.
D0.5 to 10% may have cardiac and other causes of TIA.
Surgery
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