Which of the following medications can an EMT administer in a cardiac emergency?

In a cardiac emergency, the administration of aspirin is appropriate due to its blood-thinning properties. Aspirin acts by inhibiting platelet aggregation, which can help prevent further clot formation in a patient experiencing a myocardial infarction (heart attack). By improving blood flow through the coronary arteries, administering aspirin in a timely manner can significantly enhance outcomes for patients suffering from acute cardiac conditions.

Other medications listed, such as ibuprofen and acetaminophen, primarily act as analgesics and anti-inflammatories. They do not have the specific anticoagulant effects required in the context of a cardiac emergency. Antihistamines, on the other hand, are used predominantly for allergic reactions and will not provide any therapeutic benefit in a cardiac situation. Therefore, the correct choice underscores the unique role aspirin plays in managing cardiac emergencies by reducing blood clot risks.