What are the standard doses of tablets given for a patient with chest pain?

Appeared in: ISRO 2024

Explanation

This option provides the standard evidence-based loading doses for the initial management of Acute Coronary Syndrome (ACS).
Aspirin (Disprin) 325 mg is a loading dose that rapidly inhibits platelet aggregation by blocking the COX-1 enzyme.
Clopidogrel 300 mg is a loading dose that provides dual antiplatelet therapy by blocking P2Y12 receptors on platelets, further preventing clot formation.
Atorvastatin 80 mg is a high-intensity statin dose that helps stabilize atherosclerotic plaques, reduce inflammation, and has long-term benefits in preventing recurrent events.

Option A: The dose of clopidogrel (25 mg) is significantly below the required 300 mg loading dose, making it therapeutically ineffective for an acute event. The atorvastatin dosage is also incorrectly stated.
Option C: The doses of aspirin (150 mg), atorvastatin (20 mg), and clopidogrel (150 mg) are all lower than the recommended standard loading doses for ACS.
Option D: This option lists the standard long-term maintenance doses for these medications, not the initial high doses (loading doses) required during an acute cardiac event.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacological Management of Acute Coronary Syndrome (ACS) to guide bedside assessment, documentation, and the next nursing action.
In ACS, 'time is muscle'. Rapid administration of these loading doses is critical to stop the thrombotic process, restore blood flow, and minimize myocardial damage.
A key nursing responsibility is to quickly assess for contraindications before administration, such as a history of aspirin allergy, active bleeding, or recent stroke.
What if? If a patient has a known allergy to aspirin, clopidogrel would be given, and an alternative antiplatelet might be considered, but aspirin would be strictly avoided.

How to Approach the Question

First, identify that the question is asking for the initial, emergency (loading) doses for a patient with chest pain, which implies a suspected Acute Coronary Syndrome (ACS).
Differentiate between 'loading doses' (high initial doses to achieve rapid therapeutic levels) and 'maintenance doses' (lower daily doses for long-term management).
Recall the standard loading protocol for ACS: a high dose of aspirin (162-325 mg), a P2Y12 inhibitor like clopidogrel (300 mg), and a high-intensity statin (atorvastatin 80 mg).
Evaluate each option against this protocol. Option D clearly represents maintenance doses and can be eliminated first.
Compare the remaining options. Options A and C have doses that are too low or incorrect for one or more of the drugs.
Select the option that correctly lists all three standard loading doses.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 p. 14-16

E6 Pharmacology KD Tripathi Essentials 9e Part 2 pp. 303-305, 234-236

Practise the full ISRO 2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.