Which medication inhibits platelet aggregation and is effective in treating cardiac ischemia?

Which medication inhibits platelet aggregation and is effective in treating cardiac ischemia?

• A. Aspirin
• B. Heparin
• C. Clopidogrel
• D. Warfarin

Answer: (A)

Aspirin works by irreversibly inhibiting COX-1 in platelets, which reduz the production of thromboxane A2 and directly lowers platelet aggregation. In the setting of cardiac ischemia, platelet clumping on a ruptured plaque drives thrombus formation, so rapidly reducing platelet activity helps limit blockage and improves outcomes. Its effect is fast, reliable, and it has a proven mortality benefit in acute coronary syndromes, making it the best initial choice. Heparin is an anticoagulant that slows clot formation by inhibiting thrombin and factor Xa, but it doesn’t directly stop platelet aggregation. Warfarin is another anticoagulant with slower onset and is not used for acute ischemia management. Clopidogrel is an antiplatelet that also reduces aggregation by blocking the P2Y12 receptor, and it’s often used in combination with aspirin; however, aspirin remains the first-line agent for immediate management due to its rapid action and extensive evidence base.

Aspirin works by irreversibly inhibiting COX-1 in platelets, which reduz the production of thromboxane A2 and directly lowers platelet aggregation. In the setting of cardiac ischemia, platelet clumping on a ruptured plaque drives thrombus formation, so rapidly reducing platelet activity helps limit blockage and improves outcomes. Its effect is fast, reliable, and it has a proven mortality benefit in acute coronary syndromes, making it the best initial choice.

Heparin is an anticoagulant that slows clot formation by inhibiting thrombin and factor Xa, but it doesn’t directly stop platelet aggregation. Warfarin is another anticoagulant with slower onset and is not used for acute ischemia management. Clopidogrel is an antiplatelet that also reduces aggregation by blocking the P2Y12 receptor, and it’s often used in combination with aspirin; however, aspirin remains the first-line agent for immediate management due to its rapid action and extensive evidence base.