Introduction
Cardiovascular emergencies represent the most heavily tested content area on the Certified Emergency Nurse (CEN) examination, accounting for 19 of the 150 scored questions. Mastery of this domain is essential not only for exam success but for providing life-saving care in the emergency department, where cardiac conditions remain among the leading causes of patient presentations. From acute coronary syndromes and dysrhythmias to heart failure exacerbations and aortic dissections, emergency nurses must rapidly assess, diagnose, and intervene in time-sensitive cardiovascular crises. The ability to interpret ECG findings, recognize hemodynamic instability, and implement appropriate pharmacological and procedural interventions can mean the difference between life and death for cardiac patients. This practice question set focuses on high-yield cardiovascular topics that frequently appear on the CEN exam, including acute myocardial infarction management, recognition of life-threatening conditions like cardiac tamponade and aortic dissection, appropriate use of emergency medications, and understanding of various shock states. Each question is designed to test not just factual recall but clinical reasoning and prioritization skills that mirror real-world emergency nursing practice. By working through these scenarios, you’ll strengthen your ability to quickly identify cardiovascular emergencies, select appropriate interventions, and anticipate potential complications. Whether you’re preparing for your initial CEN certification or seeking to maintain your expertise, these practice questions will help you build confidence in managing the complex cardiovascular cases you’ll encounter both on the exam and at the bedside. Use the detailed explanations to deepen your understanding of the pathophysiology, clinical presentations, and evidence-based treatments that define excellence in emergency cardiovascular nursing care.
Practice Questions
CEN CARDIOVASCULAR EMERGENCIES – 15 PRACTICE QUESTIONS
1. A 68-year-old patient presents with chest pain radiating to the left arm, diaphoresis, and nausea. The ECG shows ST-segment elevation in leads II, III, and aVF. Which coronary artery is most likely occluded?
A) Left anterior descending artery
B) Left circumflex artery
C) Right coronary artery
D) Left main coronary artery
CORRECT ANSWER: C) Right coronary artery
EXPLANATION: ST-segment elevation in leads II, III, and aVF indicates an inferior wall myocardial infarction, which is typically caused by occlusion of the right coronary artery. The right coronary artery supplies the inferior wall of the left ventricle in most patients. Recognizing the location of infarction helps guide treatment decisions and anticipate potential complications such as bradycardia or AV blocks.
2. A patient with acute decompensated heart failure is receiving IV furosemide. Which laboratory value requires immediate attention?
A) Sodium 138 mEq/L
B) Potassium 2.9 mEq/L
C) Chloride 102 mEq/L
D) Calcium 9.5 mg/dL
CORRECT ANSWER: B) Potassium 2.9 mEq/L
EXPLANATION: Hypokalemia (potassium <3.5 mEq/L) is a critical concern in patients receiving loop diuretics like furosemide. Low potassium levels increase the risk of life-threatening cardiac arrhythmias, particularly in patients with underlying heart disease. Potassium supplementation should be initiated promptly, and continuous cardiac monitoring is essential to detect dysrhythmias early.
3. A patient presents with sudden onset of severe chest pain described as “tearing” and radiating to the back. Blood pressure is 180/110 mmHg in the right arm and 140/90 mmHg in the left arm. What is the most likely diagnosis?
A) Acute myocardial infarction
B) Pulmonary embolism
C) Aortic dissection
D) Pericarditis
CORRECT ANSWER: C) Aortic dissection
EXPLANATION: The classic presentation of aortic dissection includes sudden, severe “tearing” or “ripping” chest pain radiating to the back, along with blood pressure discrepancies between extremities. This is a life-threatening emergency requiring immediate imaging (CT angiography or TEE) and blood pressure control with IV beta-blockers and vasodilators. Delay in diagnosis significantly increases mortality.
4. Which of the following ECG findings is most characteristic of pericarditis?
A) ST-segment depression in all leads
B) Diffuse ST-segment elevation with PR-segment depression
C) Peaked T waves
D) Pathological Q waves
CORRECT ANSWER: B) Diffuse ST-segment elevation with PR-segment depression
EXPLANATION: Pericarditis typically presents with diffuse ST-segment elevation (concave upward) in multiple leads, along with PR-segment depression. This differs from acute MI, which shows ST elevation in specific anatomical distributions. Other clinical features include positional chest pain (worse when lying flat, better when leaning forward), pericardial friction rub, and sometimes fever.
5. A patient with atrial fibrillation has a heart rate of 160 bpm and blood pressure of 80/50 mmHg with altered mental status. What is the most appropriate immediate intervention?
A) Administer IV diltiazem
B) Administer IV amiodarone
C) Perform synchronized cardioversion
D) Administer IV metoprolol
CORRECT ANSWER: C) Perform synchronized cardioversion
EXPLANATION: This patient is hemodynamically unstable (hypotension, altered mental status) with rapid atrial fibrillation. Synchronized cardioversion is the immediate treatment of choice for unstable tachyarrhythmias. Pharmacological rate control would be too slow and potentially worsen hypotension. Sedation should be provided if the patient is conscious, and cardioversion should be performed at 120-200 joules biphasic.
6. A patient presents with jugular venous distension, muffled heart sounds, and hypotension following blunt chest trauma. What is the priority intervention?
A) Administer IV fluid bolus
B) Perform pericardiocentesis
C) Obtain chest X-ray
D) Administer vasopressors
CORRECT ANSWER: B) Perform pericardiocentesis
EXPLANATION: This patient presents with Beck’s triad (hypotension, jugular venous distension, muffled heart sounds), indicating cardiac tamponade. This is a life-threatening emergency requiring immediate pericardiocentesis to relieve pressure on the heart. While IV fluids may provide temporary support, definitive treatment is drainage of pericardial fluid. Bedside ultrasound can confirm the diagnosis if time permits.
7. Which medication should be avoided in patients with acute decompensated heart failure and systolic blood pressure less than 90 mmHg?
A) Dobutamine
B) Furosemide
C) ACE inhibitors
D) Morphine
CORRECT ANSWER: C) ACE inhibitors
EXPLANATION: ACE inhibitors cause vasodilation and can further decrease blood pressure in hypotensive patients. In acute decompensated heart failure with systolic BP <90 mmHg, inotropic support (dobutamine) and careful diuresis are preferred. ACE inhibitors should be held until the patient is hemodynamically stable. Morphine may also be used cautiously for symptom relief and preload reduction.
8. A patient with a history of deep vein thrombosis suddenly develops dyspnea, chest pain, and hypotension. ECG shows sinus tachycardia and right axis deviation. What is the most likely diagnosis?
A) Acute myocardial infarction
B) Massive pulmonary embolism
C) Tension pneumothorax
D) Aortic dissection
CORRECT ANSWER: B) Massive pulmonary embolism
EXPLANATION: The combination of DVT history, sudden dyspnea, chest pain, hypotension, and ECG findings of sinus tachycardia with right axis deviation strongly suggests massive pulmonary embolism. The ECG may also show the classic S1Q3T3 pattern. Immediate treatment includes oxygen, anticoagulation, and consideration of thrombolytic therapy or embolectomy for hemodynamically unstable patients.
9. What is the first-line medication for symptomatic bradycardia with hemodynamic compromise?
A) Epinephrine
B) Dopamine
C) Atropine
D) Isoproterenol
CORRECT ANSWER: C) Atropine
EXPLANATION: Atropine (0.5-1 mg IV) is the first-line medication for symptomatic bradycardia. It works by blocking vagal effects on the SA and AV nodes, increasing heart rate. If atropine is ineffective, transcutaneous pacing should be initiated, followed by consideration of dopamine or epinephrine infusions. The maximum total dose of atropine is 3 mg.
10. A patient presents with chest pain and ECG shows ST-segment elevation in leads V1-V4. Which area of the heart is affected?
A) Inferior wall
B) Lateral wall
C) Anterior wall
D) Posterior wall
CORRECT ANSWER: C) Anterior wall
EXPLANATION: ST-segment elevation in leads V1-V4 indicates an anterior wall myocardial infarction, typically caused by occlusion of the left anterior descending (LAD) artery. Anterior MIs carry higher risk of complications including cardiogenic shock, ventricular aneurysm, and heart failure due to the large amount of myocardium at risk. Immediate reperfusion therapy is critical.
11. Which of the following is a contraindication to thrombolytic therapy in acute myocardial infarction?
A) Age over 75 years
B) History of ischemic stroke 6 months ago
C) Diabetes mellitus
D) Hypertension controlled with medication
CORRECT ANSWER: B) History of ischemic stroke 6 months ago
EXPLANATION: Recent stroke (within 3 months) is an absolute contraindication to thrombolytic therapy due to high risk of intracranial hemorrhage. Other absolute contraindications include active bleeding, suspected aortic dissection, and recent major surgery. Advanced age alone is not a contraindication, though it increases bleeding risk. When thrombolytics are contraindicated, primary PCI is the preferred reperfusion strategy.
12. A patient with hypertensive emergency presents with blood pressure of 220/130 mmHg and signs of acute kidney injury. What is the initial blood pressure reduction goal?
A) Reduce to normal (120/80 mmHg) within 1 hour
B) Reduce by 25% within the first hour
C) Reduce to 140/90 mmHg within 30 minutes
D) Reduce by 50% within 2 hours
CORRECT ANSWER: B) Reduce by 25% within the first hour
EXPLANATION: In hypertensive emergency with end-organ damage, the goal is to reduce blood pressure by approximately 25% within the first hour, then gradually to 160/100 mmHg over the next 2-6 hours. Rapid, excessive reduction can cause ischemia to vital organs (brain, heart, kidneys) that have adapted to elevated pressures. IV medications like nicardipine or labetalol are preferred for controlled reduction.
13. Which dysrhythmia is most commonly associated with digitalis toxicity?
A) Atrial fibrillation with rapid ventricular response
B) Ventricular tachycardia
C) Premature ventricular contractions with bigeminy
D) Supraventricular tachycardia
CORRECT ANSWER: C) Premature ventricular contractions with bigeminy
EXPLANATION: Digitalis toxicity commonly causes ventricular ectopy, particularly PVCs in a bigeminal pattern. Other dysrhythmias include atrial tachycardia with AV block, accelerated junctional rhythm, and various degrees of AV block. Non-cardiac symptoms include nausea, vomiting, visual disturbances (yellow-green halos), and confusion. Treatment includes discontinuing digoxin, correcting electrolyte abnormalities (especially hypokalemia), and administering digoxin-specific antibody fragments (Digibind) for severe toxicity.
14. A patient with suspected acute coronary syndrome should receive which combination of medications immediately?
A) Aspirin, nitroglycerin, morphine, oxygen
B) Aspirin, clopidogrel, heparin, beta-blocker
C) Aspirin, ACE inhibitor, statin, diuretic
D) Nitroglycerin, calcium channel blocker, aspirin, morphine
CORRECT ANSWER: A) Aspirin, nitroglycerin, morphine, oxygen
EXPLANATION: The mnemonic “MONA” (Morphine, Oxygen, Nitroglycerin, Aspirin) represents initial management of suspected ACS, though current guidelines emphasize aspirin as the most critical intervention. Aspirin (162-325 mg chewed) should be given immediately unless contraindicated. Nitroglycerin provides symptom relief and reduces preload. Morphine is used for pain control. Oxygen is given only if SpO2 <90%. Additional antiplatelet therapy and anticoagulation follow based on the specific ACS type.
15. What is the most common cause of cardiogenic shock following acute myocardial infarction?
A) Ventricular septal rupture
B) Papillary muscle rupture
C) Left ventricular failure
D) Right ventricular infarction
CORRECT ANSWER: C) Left ventricular failure
EXPLANATION: Left ventricular failure due to extensive myocardial damage is the most common cause of cardiogenic shock post-MI, accounting for approximately 80% of cases. It typically occurs when >40% of the left ventricle is infarcted or dysfunctional. Mechanical complications (ventricular septal rupture, papillary muscle rupture, free wall rupture) are less common but more immediately life-threatening. Treatment includes inotropic support, mechanical circulatory support devices, and urgent revascularization.
Study Tips for CEN Cardiovascular Emergencies
– Focus on ECG interpretation and recognizing STEMI patterns in different leads
– Memorize critical medication dosages and contraindications for cardiac emergencies
– Practice prioritizing interventions for unstable vs. stable cardiac patients
– Review hemodynamic parameters and their clinical significance
– Understand the pathophysiology behind different types of shock
– Study complications of acute MI and their management
– Know the differences between stable and unstable dysrhythmias
Conclusion
Cardiovascular emergencies require rapid assessment, accurate diagnosis, and timely intervention. These 15 practice questions cover the essential topics you need to master for the CEN exam and for providing excellent emergency cardiac care. Review the explanations carefully to understand not just the correct answers, but the clinical reasoning behind each decision. Good luck with your CEN preparation!
Published: 2025-12-12
Certification: CEN (Certified Emergency Nurse)
Topic: Cardiovascular Emergencies