Acute Coronary Syndromes
Help Questions
USMLE Step 2 CK › Acute Coronary Syndromes
A 70-year-old woman with diabetes has fatigue and dyspnea for 6 hours. ECG shows T-wave inversions in V4–V6; troponin mildly elevated. Which is the most appropriate initial treatment?
Order exercise treadmill testing now to confirm ischemia before initiating antiplatelet or anticoagulant therapy.
Discharge with proton pump inhibitor and arrange outpatient cardiology follow-up because symptoms are atypical for ACS.
Start dual antiplatelet therapy and anticoagulation, give high-intensity statin, and admit for early invasive evaluation.
Administer thrombolytics immediately because T-wave inversions indicate an occlusive STEMI equivalent in all patients.
Treat with NSAIDs and reassurance because normal blood pressure and no chest pain make ischemia unlikely.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of NSTEMI. The correct answer is A, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, B, fails because it overlooks the atypical presentation in women and diabetics, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as T-wave inversions and elevated troponin. Apply guideline-directed management, and avoid common pitfalls such as misinterpretation of ECG findings.
A 65-year-old man has unstable angina and is started on aspirin. He is also taking warfarin for atrial fibrillation with INR 3.5. Which is the most appropriate next step in management?
Order outpatient coronary calcium scoring because it guides therapy better than inpatient monitoring in unstable angina.
Administer thrombolytics because unstable angina requires immediate reperfusion when INR is elevated.
Continue warfarin at current dose and add full-dose heparin because triple anticoagulation is routinely recommended.
Stop aspirin because antiplatelet therapy is contraindicated in all patients receiving chronic anticoagulation.
Assess bleeding risk and coordinate antithrombotic strategy, avoiding unnecessary overlapping anticoagulation given supratherapeutic INR.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of unstable angina with anticoagulation overlap. The correct answer is B, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, A, fails because it overlooks bleeding risk with supratherapeutic INR, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as elevated INR. Apply guideline-directed management, and avoid common pitfalls such as ignoring anticoagulation status.
A 65-year-old man has recurrent chest pain at rest, normal troponins, and no ST elevation. He is diagnosed with unstable angina. Which is the most appropriate initial treatment?
Start aspirin and anticoagulation, add antianginal therapy, and admit for monitoring and further ischemic evaluation.
Administer thrombolytics because unstable angina is an early STEMI and requires immediate fibrinolysis.
Provide reassurance and discharge because normal troponin excludes acute coronary syndrome and admission is unnecessary.
Treat with ibuprofen and schedule outpatient endoscopy because episodic pain suggests reflux disease.
Order exercise stress testing immediately during active symptoms to confirm ischemia before any medications.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of unstable angina. The correct answer is A, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, B, fails because it overlooks the risk despite normal troponin, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as recurrent rest pain. Apply guideline-directed management, and avoid common pitfalls such as misinterpretation of negative biomarkers.
A 55-year-old smoker has 2 hours of chest pressure. ECG shows ST depressions in II, III, aVF; troponin is elevated. Which of the following is the most likely diagnosis?
Acute pericarditis due to pleuritic pain with diffuse ST elevations and PR depressions on ECG.
Stable angina due to fixed coronary stenosis causing exertional pain relieved by rest within minutes.
Unstable angina due to transient thrombosis with normal cardiac biomarkers and no myocardial necrosis.
STEMI due to complete coronary occlusion with ST elevation in contiguous leads and reciprocal changes.
NSTEMI due to subendocardial ischemia with elevated troponin and no persistent ST elevation on ECG.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of NSTEMI. The correct answer is C, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, D, fails because it overlooks the absence of ST elevation and elevated troponin, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as ST depressions and troponin elevation. Apply guideline-directed management, and avoid common pitfalls such as misinterpretation of ECG findings.
A 65-year-old man has chest pain at rest for 20 minutes, now resolved. ECG shows new ST depression in V5–V6; troponin is negative. Which of the following is the most likely diagnosis?
Stable angina because symptoms resolved and therefore cannot represent an acute coronary syndrome.
NSTEMI because any ST depression automatically implies myocardial infarction regardless of troponin results.
GERD because transient chest pain relieved spontaneously is most consistent with esophageal reflux disease.
STEMI because lateral ischemia typically presents with ST depression rather than ST elevation.
Unstable angina with ischemic ECG changes and negative biomarkers indicating no myocardial necrosis.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of unstable angina. The correct answer is A, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, B, fails because it overlooks that troponin is negative, distinguishing from NSTEMI, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as resolved pain and ST depression. Apply guideline-directed management, and avoid common pitfalls such as misinterpretation of ECG findings.
A 55-year-old man with NSTEMI is started on aspirin and heparin. He develops severe wheezing after aspirin administration and has a history of nasal polyps. Which is the most appropriate next step in management?
Discharge home because bronchospasm suggests asthma exacerbation rather than acute coronary syndrome.
Administer thrombolytics because antiplatelet therapy cannot be used when aspirin intolerance is suspected.
Continue aspirin and add ibuprofen because bronchospasm is mild and NSAIDs improve platelet inhibition.
Stop aspirin and use an alternative antiplatelet strategy such as a P2Y12 inhibitor, given aspirin hypersensitivity.
Discontinue heparin because aspirin reaction indicates bleeding risk and anticoagulation is contraindicated.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of NSTEMI with aspirin hypersensitivity. The correct answer is B, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, A, fails because it overlooks the risk of aspirin-induced bronchospasm, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as wheezing post-aspirin. Apply guideline-directed management, and avoid common pitfalls such as ignoring drug allergies.
A 60-year-old man with STEMI receives aspirin and is headed to PCI. He has SpO2 98% on room air and no respiratory distress. Which is the most appropriate initial treatment regarding oxygen?
Intubate early for airway protection because all STEMI patients require mechanical ventilation before PCI.
Administer oxygen only after troponin results return because oxygen is contraindicated in NSTEMI.
Administer oxygen and delay PCI until saturation reaches 100% to minimize myocardial oxygen extraction.
Withhold supplemental oxygen because routine oxygen is not indicated when saturation is adequate and patient is stable.
Administer high-flow oxygen routinely because it reduces infarct size in all patients with acute coronary syndrome.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of STEMI. The correct answer is B, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, A, fails because it overlooks evidence that routine oxygen may harm when SpO2 is normal, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as adequate saturation. Apply guideline-directed management, and avoid common pitfalls such as overuse of supplemental oxygen.
A 60-year-old man with STEMI receives aspirin and heparin. He has rales and S3; BP 92/58. ECG shows anterior ST elevation. Which is the most appropriate initial treatment?
Start IV nitroglycerin titration aggressively to reduce preload despite hypotension and suspected cardiogenic shock.
Activate emergent PCI and start vasopressor/inotrope support as needed for cardiogenic shock physiology.
Administer NSAIDs for chest pain and delay reperfusion until blood pressure stabilizes spontaneously.
Give IV fluids bolus and high-dose beta-blocker immediately to reduce myocardial oxygen demand.
Discharge with outpatient cardiology follow-up because rales and S3 are common in anxiety-related chest pain.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of STEMI with cardiogenic shock. The correct answer is C, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, A, fails because it overlooks the contraindication of nitrates in hypotension, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as rales, S3, and ST elevation. Apply guideline-directed management, and avoid common pitfalls such as misinterpretation of shock physiology.
A 55-year-old smoker has NSTEMI. ECG shows ST depressions; troponin is elevated. He has ongoing chest pain and bradycardia at 42/min with hypotension. Which is the most appropriate next step in management?
Administer IV beta-blocker immediately to reduce myocardial oxygen demand despite bradycardia and hypotension.
Order outpatient Holter monitoring only because arrhythmia evaluation precedes any ACS management decisions.
Give atropine and supportive care for symptomatic bradycardia while continuing ACS therapy and urgent evaluation.
Administer thrombolysis because bradycardia signifies an occlusive MI requiring fibrinolysis regardless of ECG findings.
Discontinue antiplatelet therapy because bradycardia indicates noncardiac chest pain and low ACS risk.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of NSTEMI with bradycardia. The correct answer is B, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, A, fails because it overlooks contraindication of beta-blockers in bradycardia and hypotension, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as low heart rate and ST depressions. Apply guideline-directed management, and avoid common pitfalls such as inappropriate antianginal use.
A 55-year-old man with HTN and hyperlipidemia has 45 minutes of substernal pressure with diaphoresis. ECG shows ST elevation in V2–V5; troponin pending. Which is the most appropriate next step in management?
Order D-dimer and CT pulmonary angiography now because diaphoresis suggests pulmonary embolism more than ACS.
Administer IV thrombolysis routinely for all suspected ACS before confirming STEMI on ECG to save time.
Administer aspirin, start heparin infusion, and schedule outpatient stress testing within 72 hours if pain resolves.
Provide ibuprofen for analgesia and observe on telemetry while awaiting serial troponins and repeat ECG.
Give aspirin and a P2Y12 inhibitor, activate emergent PCI, and administer anticoagulation while preparing for cath lab.
Explanation
This question tests understanding and management of Acute Coronary Syndromes as per USMLE Step 2 CK standards. Acute Coronary Syndromes encompass conditions like STEMI, NSTEMI, and Unstable Angina, characterized by acute myocardial ischemia. In this scenario, the patient's symptoms and ECG findings are indicative of STEMI. The correct answer is B, which aligns with current management guidelines and addresses the patient's immediate needs. A common distractor, A, fails because it overlooks the need for emergent reperfusion in STEMI, leading to inadequate management. To approach similar questions, identify key symptoms and diagnostic markers such as ST elevation. Apply guideline-directed management, and avoid common pitfalls such as delaying PCI.