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Review Question - QID 214372

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QID 214372 (Type "214372" in App Search)
A 55-year-old man presents to the emergency department for slurred speech and weakness affecting his left upper and lower extremities. His symptoms began approximately 2 hours ago and have not improved. A CT scan of the head is negative for an intracranial hemorrhage or space-occupying lesion, and he is started on alteplase. He is admitted to the hospital for further monitoring. In addition to aspirin, he is started on a second agent for secondary stroke prevention. Which of the following is the mechanism of action of this second agent?