What is the primary pathophysiological difference between STEMI and NSTEMI?
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Focus on the presentation, diagnosis, and initial treatment strategies for ACS, including STEMI and NSTEMI.
Mastering this deck enhances your ability to promptly recognize ACS presentations, interpret diagnostic tests accurately, and initiate appropriate management, thereby improving patient outcomes during critical early phases of care.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary pathophysiological difference between STEMI and NSTEMI? | STEMI involves complete occlusion of a coronary artery leading to transmural myocardial infarction with ST-segment elevation on ECG, whereas NSTEMI involves partial occlusion causing subendocardial infarction without ST-segment elevation. | Think of STEMI as full blockage, NSTEMI as partial blockage. |
| 2 | What are the classic symptoms of acute coronary syndrome? | Chest pain or discomfort often described as pressure, squeezing, or tightness, potentially radiating to the arm, neck, jaw, or back, often accompanied by shortness of breath, diaphoresis, nausea, or syncope. | Remember the typical 'crushing' chest pain. |
| 3 | Which initial ECG finding is diagnostic of STEMI? | Persistent ST-segment elevation of ≥1 mm in two or more contiguous leads. | Think 'ST-elevation equals STEMI.' |
| 4 | What is the role of cardiac biomarkers in ACS diagnosis? | Troponins I and T are the primary biomarkers; their elevation indicates myocardial injury and helps confirm myocardial infarction, especially when ECG changes are inconclusive. | Troponins are the 'gold standard' markers for myocardial damage. |
| 5 | When should you consider urgent reperfusion therapy in ACS? | In patients with STEMI presenting within 12 hours of symptom onset, especially if there is ongoing chest pain and ST-elevation on ECG. | Time is myocardium: aim for door-to-balloon within 90 minutes. |
| 6 | What is the first-line pharmacologic treatment for ACS? | Aspirin (antiplatelet agent), nitroglycerin (for pain relief), and oxygen if hypoxic, along with morphine for severe pain if needed. | Think 'A NOS'—Aspirin, Nitrates, Oxygen, and Morphine. |
| 7 | Why is early administration of dual antiplatelet therapy important in ACS? | It reduces thrombus formation, prevents further occlusion, and decreases the risk of myocardial infarction and death. | Platelet aggregation is key in clot formation. |
| 8 | What is the definitive treatment for STEMI? | Percutaneous coronary intervention (PCI) with coronary angioplasty and stent placement, preferably within 90 minutes of hospital arrival. | Call it 'the primary PCI' or 'door-to-balloon time.' |
| 9 | In NSTEMI, what is the initial management strategy? | Medical stabilization with antiplatelet and anticoagulant therapy, with urgent coronary angiography planned within 24-72 hours, depending on risk stratification. | NSTEMI often requires a 'watchful waiting' approach with early invasive assessment. |
| 10 | What risk stratification tools are used in ACS to guide management? | The TIMI (Thrombolysis In Myocardial Infarction) and GRACE (Global Registry of Acute Coronary Events) scores assess the risk of mortality and guide urgency of intervention. | Higher scores suggest higher risk and need for aggressive management. |
| 11 | What are common contraindications for fibrinolytic therapy in ACS? | Active bleeding, history of hemorrhagic stroke, recent major surgery, or intracranial neoplasm. | Always assess bleeding risk before thrombolysis. |
| 12 | Which medication is used to prevent re-occlusion after PCI? | Dual antiplatelet therapy, typically aspirin plus a P2Y12 inhibitor like clopidogrel, prasugrel, or ticagrelor. | Think of DAPT as the 'shield' post-intervention. |
| 13 | What lifestyle modifications are recommended after an ACS event? | Smoking cessation, dietary changes, regular exercise, weight management, blood pressure control, and lipid-lowering therapy. | Secondary prevention focuses on lifestyle and medications. |
| 14 | What is the significance of persistent ST-segment elevation after reperfusion therapy? | Persistent ST elevation suggests failed reperfusion or ongoing ischemia, necessitating further intervention or assessment. | Look for ST normalization as a sign of successful reperfusion. |
| 15 | How does a typical ECG of NSTEMI differ from STEMI? | NSTEMI may show ST-segment depression, T-wave inversion, or non-specific changes, but no persistent ST elevation; in STEMI, ST elevation is prominent. | No ST elevation? Consider NSTEMI. |
| 16 | What is the role of beta-blockers in ACS management? | Beta-blockers reduce myocardial oxygen demand, control arrhythmias, and decrease mortality when given early in appropriate patients. | Beta-blockers 'calm the heart.' |
| 17 | Why is it important to control blood pressure in ACS patients? | To reduce myocardial workload and prevent further ischemic injury, while avoiding hypotension which can compromise perfusion. | Balance is key: avoid extremes. |
| 18 | What are the signs of cardiogenic shock in ACS? | Hypotension, tachycardia, cold clammy skin, altered mental status, and signs of poor perfusion. | Think 'shock' as inadequate cardiac output. |
| 19 | When is invasive coronary angiography indicated in NSTEMI? | Within 24-72 hours for high-risk patients, or sooner if ongoing ischemia or hemodynamic instability occurs. | Risk stratification guides timing. |
| 20 | What is the primary goal in the initial management of ACS? | Rapid diagnosis, pain relief, stabilization, and timely reperfusion or revascularization to minimize myocardial damage. | Speed saves myocardium. |
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