Myocardial Infarction — NCLEX Cheat Sheet
Ischemic heart muscle deathAlso known as: heart attack · MI · STEMI · NSTEMI · coronary
Use this quick-reference guide to spot, treat, and prevent Myocardial Infarction on the NCLEX. Keep it handy during review and on exam day!
🩺📒 The 1-minute cheat sheet
🩺 Signs
- Crushing chest pain → arm/jaw
- Not relieved by rest/nitro
- Diaphoresis, N/V, SOB, anxiety
- Women: fatigue, atypical pain
🧪 Labs
- ↑ Troponin (gold standard)
- ST elevation = STEMI
✅ Do
- MONA: Morphine O₂ Nitro Aspirin
- PCI within 90 min, 12-lead ECG
- Bed rest, telemetry, IV access
🚩 Report
- V-fib, cardiogenic shock
📚 Myocardial Infarction — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Key points
Understand these first- Classic symptom is crushing substernal chest pain or pressure that may radiate to the left arm, jaw, neck, or back and is unrelieved by rest or nitroglycerin.
- Associated signs include diaphoresis, nausea, dyspnea, anxiety, and a sense of impending doom.
- Women, older adults, and diabetics often present atypically with fatigue, indigestion, or shortness of breath rather than classic chest pain.
- A STEMI shows ST-segment elevation on ECG and indicates full-thickness injury; NSTEMI shows ST depression or T-wave inversion.
- Troponin is the most specific cardiac biomarker and rises within hours, staying elevated for days.
Nursing priorities
What to do, in order- Obtain a 12-lead ECG within 10 minutes and draw cardiac troponin.
- Administer aspirin to chew, then nitroglycerin, oxygen if saturation is low, and morphine for unrelieved pain per protocol.
- Place the patient on continuous cardiac monitoring and establish IV access.
- Prepare for emergent reperfusion: percutaneous coronary intervention (PCI) goal door-to-balloon under 90 minutes, or fibrinolytics if PCI unavailable.
- Keep the patient on bed rest with the head of bed elevated and minimize oxygen demand.
Red flags — report now
Escalate immediately- New or worsening chest pain, ST changes, or hemodynamic instability requires immediate provider notification.
- Life-threatening dysrhythmias such as ventricular tachycardia or ventricular fibrillation demand immediate defibrillation.
- Signs of cardiogenic shock (hypotension, cool clammy skin, decreased urine output) or new crackles signaling heart failure must be escalated now.
Labs & values
Numbers to know- Troponin I/T: normally less than 0.04 ng/mL (elevated in MI)
- CK-MB: normally 0-3 ng/mL
- Myoglobin: rises earliest but is nonspecific
Patient teaching
What patients must know- Call 911 immediately for chest pain lasting more than 5 minutes that is not relieved by rest or nitroglycerin.
- Take prescribed antiplatelet, beta-blocker, statin, and ACE inhibitor medications as ordered and do not stop them abruptly.
- Adopt cardiac risk reduction: stop smoking, follow a low-fat low-sodium diet, manage weight, and follow a supervised activity plan.
❓ Myocardial Infarction: NCLEX FAQs
What are the priority nursing interventions for Myocardial Infarction?
Obtain a 12-lead ECG within 10 minutes and draw cardiac troponin. Administer aspirin to chew, then nitroglycerin, oxygen if saturation is low, and morphine for unrelieved pain per protocol. Place the patient on continuous cardiac monitoring and establish IV access. Prepare for emergent reperfusion: percutaneous coronary intervention (PCI) goal door-to-balloon under 90 minutes, or fibrinolytics if PCI unavailable.
What are the warning signs of Myocardial Infarction a nurse must report?
New or worsening chest pain, ST changes, or hemodynamic instability requires immediate provider notification. Life-threatening dysrhythmias such as ventricular tachycardia or ventricular fibrillation demand immediate defibrillation. Signs of cardiogenic shock (hypotension, cool clammy skin, decreased urine output) or new crackles signaling heart failure must be escalated now.
What do I need to know about Myocardial Infarction for the NCLEX?
Classic symptom is crushing substernal chest pain or pressure that may radiate to the left arm, jaw, neck, or back and is unrelieved by rest or nitroglycerin. Associated signs include diaphoresis, nausea, dyspnea, anxiety, and a sense of impending doom. Women, older adults, and diabetics often present atypically with fatigue, indigestion, or shortness of breath rather than classic chest pain. A STEMI shows ST-segment elevation on ECG and indicates full-thickness injury; NSTEMI shows ST depression or T-wave inversion.
What patient teaching is important for Myocardial Infarction?
Call 911 immediately for chest pain lasting more than 5 minutes that is not relieved by rest or nitroglycerin. Take prescribed antiplatelet, beta-blocker, statin, and ACE inhibitor medications as ordered and do not stop them abruptly. Adopt cardiac risk reduction: stop smoking, follow a low-fat low-sodium diet, manage weight, and follow a supervised activity plan.
Quick Tip
Classic symptom is crushing substernal chest pain or pressure that may radiate to the left arm, jaw, neck, or back and is unrelieved by rest or nitroglycerin.
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