Which pharmacologic property of aspirin is important in the treatment of myocardial infarction?

The pharmacologic property of aspirin that is crucial in the treatment of myocardial infarction is its antithrombotic effect. Aspirin works by inhibiting platelet aggregation, which reduces the ability of platelets to clump together and form blood clots. In the context of a myocardial infarction, where a clot can obstruct blood flow to the heart muscle, the antithrombotic action of aspirin plays a vital role in preventing further clot formation or extension of an existing clot. This can help restore blood flow and limit damage to the heart tissue.

While aspirin does have antipyretic properties that reduce fever, analgesic effects for pain relief, and anti-inflammatory effects, these are not the primary reasons it's used in an acute myocardial infarction scenario. The focus during a myocardial infarction is to prevent clot formation and ensure blood flow, making the antithrombotic property the critical factor in its therapeutic role.