What is the primary pathophysiological difference between STEMI and NSTEMI?
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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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| 1 | 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.
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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