NREMT Emergency Medical Technician (EMT) Cognitive ExamPharmacologyHard
An EMT is treating a 60-year-old male presenting with classic signs and symptoms of a myocardial infarction (MI), including crushing chest pain radiating to his left arm, nausea, and diaphoresis. He denies any allergies. Which of the following medications should be administered first, assuming no contraindications, as per standard cardiac emergency protocols?
- AMorphine
- BAspirin
- CNitroglycerin
- DOxygen
Show answer & explanationAnswer & explanation
Correct answer: D. Oxygen
While Aspirin and Nitroglycerin are crucial for MI, the initial priority in acute cardiac emergencies, especially in patients with signs of hypoxemia or respiratory distress, is oxygen administration. If the patient's SpO2 is below 94% or they are in respiratory distress, oxygen should be initiated first to improve myocardial oxygen supply.
Why the other options are wrong
- A. Morphine may be used for pain relief in MI, but it is typically administered after oxygen, aspirin, and nitroglycerin, and is not an EMT-level medication in many protocols.
- B. Aspirin is critical for MI to prevent clot formation, but oxygen administration, if indicated by hypoxia or respiratory distress, takes precedence to address immediate oxygenation needs.
- C. Nitroglycerin is important for MI, but oxygen is often prioritized first, especially if the patient is hypoxic or in respiratory distress. Nitroglycerin also has contraindications (e.g., hypotension) that must be assessed.
Acute MI Prehospital Management
The immediate interventions provided by EMTs to patients suspected of having a myocardial infarction, following a specific order of priority.
- Prioritize oxygen if SpO2 < 94% or respiratory distress.
- Administer Aspirin (162-324 mg chewable) to inhibit platelet aggregation.
- Administer Nitroglycerin (0.4 mg SL) for vasodilation and pain relief, if BP allows.
- Consider pain management (e.g., morphine by ALS), monitor vitals, rapid transport.
Memory trick: MONA is the MI guide, but O2 first, if lungs are tied.