Review Question - QID 215072

A 65-year-old man is brought to the emergency department by ambulance after collapsing in pain as witnessed by his son. The patient reports that he had been feeling some chest discomfort that he believed was acid reflux for most of the morning, but the pain became much more severe when he was walking to his car. He describes the pain as 10/10, crushing, and located in the center of his chest. He has no reported past medical history but has not seen a physician in many years. He has a 30-pack-year smoking history but quit 10 years ago. On arrival, his temperature is 98.6°F (37°C), blood pressure is 175/98 mmHg, pulse is 124/min, and respirations are 20/min. ECG in the emergency department shows ST-segment elevations in leads V1 and V2. The emergency medicine team administers several therapies, one of which produces a sudden decrease in his chest pain. While this drug improves the patient's pain, it will not affect his mortality risk. Which of the following describes the mechanism of action of this medication?