A 65 years old male presents in the emergency with severe chest pain for the last 2 hours. An acute myocardial infarction is diagnosed. What would be the treatment of choice?

Appeared in: RML 2023

Explanation

Streptokinase is a thrombolytic agent, which is a class of drugs that actively dissolves blood clots.
The primary goal in an acute ST-elevation myocardial infarction (STEMI) is rapid reperfusion (restoration of blood flow) to the blocked coronary artery.
When percutaneous coronary intervention (PCI) is not available within the recommended timeframe (e.g., 120 minutes), thrombolytic therapy is the treatment of choice.
Administering a thrombolytic within the first few hours of symptom onset, as in this case, significantly improves outcomes by limiting infarct size and preserving heart function.

Option A: Aspirin is an antiplatelet agent, not a thrombolytic. It prevents platelets from aggregating and making the clot larger but does not break down the existing clot.
Option C: Atorvastatin is a statin used for long-term lipid-lowering and secondary prevention of cardiovascular events. It has no role in the acute treatment of a coronary thrombus.
Option D: Nitroglycerin is a vasodilator used for symptomatic relief of chest pain (angina). It reduces myocardial oxygen demand but does not address the underlying clot.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Pharmacological management of acute myocardial infarction (MI), specifically reperfusion therapy in acute care settings.
The concept of 'time is muscle' is paramount in MI care. The earlier reperfusion is achieved, the more heart muscle is saved. Nurses play a key role in rapidly identifying MI symptoms and facilitating prompt treatment.
A critical nursing responsibility during and after thrombolytic administration is to monitor for signs of bleeding, which is the most significant complication. This includes monitoring for changes in mental status (intracranial hemorrhage), hematuria, and gastrointestinal bleeding.
Nurses also monitor for signs of successful reperfusion, such as the resolution of chest pain, normalization of the ST-segment on the ECG, and the appearance of reperfusion arrhythmias (e.g., accelerated idioventricular rhythm).

How to Approach the Question

First, identify the patient's diagnosis and the urgency of the situation. The diagnosis is 'acute myocardial infarction' with a short symptom duration ('2 hours'), indicating a time-critical emergency.
Next, understand the primary therapeutic goal for this condition. For an acute MI, the goal is to restore blood flow (reperfuse) to the blocked coronary artery as quickly as possible.
Analyze the provided options based on their mechanism of action in the context of an acute MI.
Classify each drug: Aspirin (antiplatelet), Streptokinase (thrombolytic), Atorvastatin (statin/lipid-lowering), and Nitroglycerin (vasodilator).
Determine which drug directly achieves the primary goal of reperfusion. Only Streptokinase, the thrombolytic, dissolves the existing clot.
Conclude that while other drugs are part of the overall management, the 'treatment of choice' for definitive reperfusion among the options is the thrombolytic agent.

Concept Tested & Keywords

Concept Tested: Pharmacological management of acute myocardial infarction (MI), specifically reperfusion therapy.
Stem keywords: acute myocardial infarction, severe chest pain, 2 hours, treatment of choice
Lead-in keywords: treatment of choice
Clinical cues: Presentation within 2 hours of chest pain is a critical cue, indicating the patient is within the optimal window for reperfusion therapy.

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E6 Medicine Harrison 22e Part 2 p. 22-24

E6 Medicine Davidson Principles Practice 24e p. 520-522

Practise the full RML 2023

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