Review Question - QID 211066

A 54-year-old man with a history of hyperlipidemia presents to the emergency department complaining of left sided chest pain. He says the pain began 3 hours ago while he was cooking dinner in his kitchen. The pain radiates to his left arm and stomach. He also complains of feeling anxious and heart palpitations. Temperature is 98.7°F (37.1°C), blood pressure is 130/80 mmHg, pulse is 101/min, and respirations are 22/min. Inspection demonstrates a diffuse diaphoresis, and cardiac auscultation reveals an S4 gallop. Cardiac catheterization reveals occlusion of the left anterior descending artery, and a vascular stent is placed. The patient is discharged on aspirin, atorvastatin, and an antiplatelet medication. Which of the following is the mechanism of action of the most likely prescribed antiplatelet medication?