Important Notice
This quiz is for education only and does not replace clinical judgment, local protocols, or official guidelines.
Selected References
Quiz Progress
Question 0 of 5
Correct Answer: A - Discharge with outpatient stress testing within 72 hours
Why correct: This patient has low-risk features: normal ECG, normal hs-TnI, and typical but not high-risk chest pain presentation. Per ACC/AHA guidelines, low-risk patients with normal initial evaluation can be safely discharged with outpatient stress testing within 72 hours.
Why B is wrong:
Invasive angiography is inappropriate for low-risk patients without ischemic ECG changes or elevated biomarkers.
Why C is wrong:
Anticoagulation and antiplatelets are indicated for confirmed ACS, not for rule-out cases.
Why D is wrong:
Prolonged observation admission is not indicated for TIMI score 0-1 patients with normal initial evaluation.
Key Point: hs-TnI < URL with normal ECG allows safe discharge with outpatient evaluation, reducing unnecessary admissions while maintaining safety.
Reference: 2021 ACC/AHA Chest Pain Guideline.
Correct Answer: A - Cardiac tamponade - emergent pericardiocentesis
Why correct: Beck's triad (hypotension, elevated JVP, muffled heart sounds) plus electrical alternans and recent pericarditis history confirms cardiac tamponade. Emergent pericardiocentesis is indicated before echocardiographic confirmation in unstable patients.
Why B is wrong:
Diuretics would worsen hypotension in tamponade by reducing preload. This patient needs pericardiocentesis, not HF therapy.
Why C is wrong:
While PE can cause tachycardia and hypotension, it doesn't explain elevated JVP or electrical alternans. Tamponade is more likely with pericarditis history.
Why D is wrong:
ACS doesn't typically present with pulsus paradoxus or electrical alternans. Normal troponin would be expected in acute tamponade.
Critical Point: In suspected tamponade with hemodynamic instability, bedside pericardiocentesis should not be delayed for formal echo. Electrical alternans is pathognomonic for tamponade.
Reference: 2015 ESC Pericardial Diseases Guideline.
Correct Answer: A - IV labetalol 20 mg bolus followed by infusion
Why correct: This patient demonstrates hypertensive encephalopathy with end-organ damage (confusion, papilledema). IV labetalol is a first-line agent combining alpha and beta blockade, allowing controlled BP reduction without reflex tachycardia. Target is 10-15% MAP reduction in first hour.
Why B is wrong:
Oral agents have delayed onset (hours) and are inappropriate for hypertensive emergencies with neurologic symptoms.
Why C is wrong:
Nitroprusside causes rapid BP reduction and can lead to cerebral hypoperfusion. Not ideal for encephalopathy.
Why D is wrong:
Nitroglycerin is appropriate for ischemic chest pain, not for hypertensive emergencies with neurologic manifestations.
Critical Point: Hypertensive emergencies require IV titratable agents with gradual BP reduction. Avoid overshooting target BP, which can cause ischemic injury to end organs.
Reference: 2017 ACC/AHA Hypertension Guideline.
Correct Answer: A - Rate control with beta-blocker (metoprolol) or calcium channel blocker (diltiazem)
Why correct: This patient has new-onset AF with RVR but is hemodynamically stable. Rate control is preferred over rhythm control for initial management per AHA/ACC guidelines. Beta-blockers or non-dihydropyridine CCBs are first-line agents to achieve ventricular rate <110 bpm at rest.
Why B is wrong:
Synchronized cardioversion is indicated for unstable patients (chest pain, hypotension, heart failure) or when rhythm control is preferred. Not for stable AF with RVR.
Why C is wrong:
Amiodarone is used for refractory rate control or rhythm control in specific cases, not as initial therapy for new-onset AF.
Why D is wrong:
TEE-guided cardioversion is considered when AF duration >48 hours and anticoagulation is planned. This appears to be recent-onset AF.
Critical Point: Rate control is equivalent to rhythm control for mortality outcomes. Anticoagulation decisions depend on CHADS2 score and AF duration assessment.
Reference: 2019 AHA/ACC/HRS Atrial Fibrillation Focused Update.
Correct Answer: A - Initiate dobutamine infusion 5-10 mcg/kg/min
Why correct: This patient has refractory cardiogenic shock despite triple therapy. Dobutamine is the inotrope of choice in cardiogenic shock, providing inotropic support with less vasoconstriction than norepinephrine. It improves cardiac output without significantly increasing SVR.
Why B is wrong:
Increasing norepinephrine would worsen afterload in systolic heart failure, potentially decreasing cardiac output. Vasopressors are second-line after inotropes.
Why C is wrong:
Milrinone is an alternative inotrope but contraindicated in ischemic cardiomyopathy due to potential proarrhythmic effects. Dobutamine is preferred first-line.
Why D is wrong:
IABP provides afterload reduction and improved coronary perfusion but is invasive and not indicated before optimizing medical therapy with inotropes.
Critical Point: In refractory cardiogenic shock, inotropes (dobutamine) are initiated before escalating to vasopressors or mechanical support. Monitor for arrhythmias and consider mechanical circulatory support if refractory.
Reference: 2017 AHA Scientific Statement on Cardiogenic Shock.
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