What is the first-line adult treatment for acute myocardial infarction in many protocols?

• A. Chewed aspirin 162-325 mg, then nitroglycerin and analgesia per protocol
• B. Immediate morphine administration only
• C. Intravenous fluids and rest
• D. Beta-blocker monotherapy

Answer: (A)

Early antiplatelet therapy is essential in acute myocardial infarction because it directly inhibits the clot-forming process that can worsen ischemia. Chewing aspirin at a dose of 162–325 mg allows rapid absorption and rapid onset of platelet inhibition, which has been shown to reduce mortality by limiting further thrombosis. After aspirin, nitroglycerin is given to alleviate chest pain and improve blood flow through vasodilation, as long as there are no contraindications like low blood pressure. Analgesia per protocol, often morphine, helps control pain and sympathetic drive, but it does not address the underlying clot formation. The other options miss the urgent antiplatelet effect, either by focusing on pain relief alone, relying on fluids and rest, or using beta-blockers without addressing the thrombosis first.