Barkley Emergency Nurse Practitioner (ENP-C) Certification Review 2nd Edition Certification Review

Barkley Emergency Nurse Practitioner (ENP-C) Certification Review 2nd Edition Certification Review 150 Actual Exam Questions & Answers with Detailed Rationales Introduction Welcome to the Barkley Emergency Nurse Practitioner (ENP-C) Certification Review Practice Exam. This comprehensive question bank has been meticulously designed to align with the American Academy of Nurse Practitioners (AANP) ENP-C exam blueprint and reflects current evidence-based emergency medicine guidelines. This practice exam covers all major clinical domains tested on the ENP-C certification examination, including cardiovascular emergencies, respiratory emergencies, neurological emergencies, gastrointestinal emergencies, infectious diseases, trauma, toxicology, environmental emergencies, ENT and ophthalmology, obstetrics and gynecology, pediatrics, psychiatric emergencies, and professional practice issues. Each question presents a realistic clinical scenario requiring application of critical thinking, clinical reasoning, and evidence-based decision-making. The detailed rationales provided for each correct answer are designed to reinforce key concepts and expand your clinical knowledge base. Focus on understanding the underlying pathophysiological principles and management strategies rather than memorizing isolated facts. The 150 questions in this bank represent the breadth and depth of content you will encounter on the actual ENP-C examination. Use this resource to identify knowledge gaps, reinforce your understanding of emergency medicine principles, and build confidence in your clinical decision-making abilities. Good luck with your certification preparation! CARDIOVASCULAR EMERGENCIES (Questions 1–25) Q1. A 68-year-old male with a history of hypertension and type 2 diabetes presents with acute substernal chest pressure that began 45 minutes ago while shoveling snow. He rates the pain 8/10 and reports associated diaphoresis, nausea, and shortness of breath. His vital signs are: BP 148/92 mmHg, HR 102 bpm, RR 22/min, SpO2 95% on room air. ECG demonstrates 3 mm ST-segment elevation in leads V1–V4 with hyperacute T-waves. The closest PCI-capable hospital is 15 minutes away by ambulance. What is the most appropriate initial management strategy? A) Administer tenecteplase (TNK) immediately in the emergency department B) Transfer emergently to the PCI-capable hospital for primary percutaneous coronary intervention C) Initiate medical therapy with aspirin, nitroglycerin, and heparin while awaiting transfer D) Perform immediate thrombolysis followed by transfer for rescue PCI Answer: B – Transfer emergently to the PCI-capable hospital for primary percutaneous coronary intervention Rationale: Primary percutaneous coronary intervention (PCI) is the preferred reperfusion strategy for acute ST-segment elevation myocardial infarction (STEMI) when it can be performed within 90 minutes of first medical contact by a skilled provider at a PCI-capable hospital. This patient presents with classic STEMI findings and is within 15 minutes of a PCI-capable facility, making transfer for primary PCI the optimal strategy. While medical therapy including aspirin, nitroglycerin, and heparin should be initiated immediately, these are adjunctive treatments and do not replace definitive reperfusion. Thrombolytic therapy is indicated only when PCI cannot be performed within 120 minutes of first medical contact. The goal door-to-balloon time should be ≤90 minutes at PCI-capable hospitals. Immediate CABG is not appropriate as initial reperfusion for acute STEMI. Q2. A 58-year-old female presents with acute onset of severe, tearing chest pain that radiates to her interscapular region. The pain began suddenly 2 hours ago while she was resting. Her past medical history is significant for hypertension and Marfan syndrome. On examination, she appears anxious and pale. Blood pressure is 185/95 mmHg in the right arm and 110/70 mmHg in the left arm. Heart rate is 112 bpm and regular. Which diagnostic study is most appropriate to confirm the suspected diagnosis? A) CT angiography of the chest B) Transthoracic echocardiogram C) Transesophageal echocardiogram D) Chest X-ray with barium swallow Answer: A – CT angiography of the chest Rationale: This patient’s presentation is classic for acute aortic dissection, characterized by sudden-onset severe tearing chest pain that radiates to the back, along with a blood pressure differential between arms and a history of Marfan syndrome (a connective tissue disorder predisposing to aortic dissection). CT angiography of the chest is the gold standard diagnostic test for aortic dissection, offering high sensitivity and specificity, rapid acquisition, and the ability to delineate the extent of dissection and involvement of branch vessels. Transesophageal echocardiography (TEE) is an alternative but is operator-dependent and more invasive. Transthoracic echocardiography has limited sensitivity for aortic dissection. CT angiography is preferred over TEE in hemodynamically stable patients due to its non-invasive nature and comprehensive anatomical detail. Chest X-ray may show a widened mediastinum but lacks diagnostic specificity for dissection. Urgent surgical consultation is required upon confirmation. Q3. A 72-year-old male presents to the emergency department with acute dyspnea, pleuritic chest pain, and hemoptysis. He reports returning from a 14-hour international flight 3 days ago. His vital signs are: BP 105/68 mmHg, HR 118 bpm, RR 28/min, SpO2 89% on room air. ECG reveals sinus tachycardia with S1Q3T3 pattern. D-dimer is markedly elevated at 5.2 mcg/mL (normal 0.5). What is the most appropriate next diagnostic test? A) CT pulmonary angiography (CTPA) B) Ventilation-perfusion (V/Q) scan C) Lower extremity venous duplex ultrasound D) Echocardiogram Answer: A – CT pulmonary angiography (CTPA) Rationale: This patient presents with high clinical probability for pulmonary embolism (PE) based on the Wells criteria, which includes prolonged travel, tachycardia, hemoptysis, and clinical signs of PE. The S1Q3T3 pattern on ECG, while nonspecific, can be seen in acute PE. In patients with high clinical probability, CT pulmonary angiography (CTPA) is the diagnostic test of choice due to its high sensitivity and specificity for detecting pulmonary emboli. CTPA provides direct visualization of thromboemboli in the pulmonary vasculature. A V/Q scan may be used in patients with contraindications to CT contrast but has lower diagnostic accuracy and is less commonly employed. Lower extremity venous duplex ultrasound would evaluate for deep vein thrombosis but does not confirm PE. Echocardiography may assess for right heart strain but is not diagnostic for PE. D-dimer testing is appropriate for low-to-moderate probability, but in high-probability patients, proceeding directly to CTPA is indicated. Q4. A 45-year-old male with no significant past medical history presents to the emergency department with substernal chest pressure that occurs with moderate exertion, such as walking up stairs, and is relieved by rest or sublingual nitroglycerin. He reports these symptoms have been occurring for approximately 6 weeks and are gradually worsening. His ECG shows no acute ischemic changes, and serial troponin levels are within normal limits. What is the most appropriate initial diagnostic evaluation for this patient? A) Exercise stress test B) Coronary angiography C) CT coronary angiography D) Resting echocardiogram Answer: A – Exercise stress test Rationale: This patient’s presentation is consistent with stable angina pectoris, characterized by predictable, exertion-induced chest pain that resolves with rest or nitroglycerin. In patients with stable angina, normal resting ECG, and negative cardiac biomarkers, the most appropriate initial diagnostic test is an exercise stress test (also known as treadmill exercise test or stress ECG). Exercise stress testing evaluates for inducible myocardial ischemia by monitoring ECG changes, hemodynamic response, and symptom development during progressively increasing exercise. The test provides functional assessment and risk stratification. Coronary angiography is typically reserved for patients with high-risk features, positive stress tests, or unstable angina. CT coronary angiography may be considered but is not typically first-line for low-to-intermediate risk stable angina. Resting echocardiography may assess for structural abnormalities but does not evaluate for inducible ischemia, which is the primary concern in this presentation. Q5. A 55-year-old female with a history of paroxysmal atrial fibrillation presents with palpitations, lightheadedness, and shortness of breath that began 2 hours ago. Her vital signs are: BP 105/72 mmHg, HR 162 bpm irregularly irregular, RR 24/min, SpO2 96% on room air. ECG confirms atrial fibrillation with rapid ventricular response. She is awake and alert. Which of the following is the most appropriate initial management? A) Vagal maneuvers B) IV diltiazem bolus followed by continuous infusion C) IV amiodarone D) Synchronized cardioversion Answer: B – IV diltiazem bolus followed by continuous infusion Rationale: This patient is hemodynamically stable with symptomatic atrial fibrillation and rapid ventricular response. The most appropriate initial management is rate control using a calcium channel blocker such as IV diltiazem. Diltiazem acts on the AV node to slow ventricular conduction, thereby reducing heart rate. A bolus dose (0.25 mg/kg IV over 2 minutes) followed by continuous infusion is standard therapy. Rate control is preferred over rhythm control in stable patients with atrial fibrillation. Vagal maneuvers are ineffective for rate control in atrial fibrillation. IV amiodarone may be used for rhythm control but is generally reserved for unstable patients or those with structural heart disease and is not first-line for rate control in this scenario. Synchronized cardioversion is indicated only in hemodynamically unstable patients (hypotension, altered mental status, chest pain, or heart failure), which this patient does not exhibit. Q6. A 68-year-old male with a history of non-ischemic dilated cardiomyopathy presents with progressive dyspnea on exertion, orthopnea, and paroxysmal nocturnal dyspnea. Physical examination reveals crackles in both lung bases, jugular venous distension, peripheral edema, and a new S3 gallop. His most recent echocardiogram showed a left ventricular ejection fraction of 28%. Current medications include furosemide 40 mg daily and lisinopril 20 mg daily. Which medication should be added to his regimen to reduce mortality? A) Digoxin B) Metoprolol succinate C) Hydralazine D) Amiodarone Answer: B – Metoprolol succinate Rationale: This patient has heart failure with reduced ejection fraction (HFrEF) as evidenced by LVEF 40% and signs of volume overload. Beta-blockers, including metoprolol succinate, carvedilol, and bisoprolol, are guideline-directed medical therapies that have been shown to significantly reduce all-cause mortality and hospitalizations in patients with HFrEF. Beta-blockers exert their beneficial effects through inhibition of the sympathetic nervous system, which is chronically activated in heart failure, improving ventricular remodeling and reducing arrhythmic death. Digoxin improves symptoms and reduces hospitalizations but has not been shown to reduce mortality. Hydralazine with nitrates is indicated in African American patients with HFrEF as an adjunct but is not first-line. Amiodarone is an antiarrhythmic and has not demonstrated mortality benefit in HFrEF. The combination of an ACE inhibitor, beta-blocker, and diuretic represents foundational therapy for HFrEF. Q7. A 25-year-old female without significant past medical history presents to the emergency department with palpitations that started suddenly 30 minutes ago while she was resting. She denies chest pain, shortness of breath, or lightheadedness. Her vital signs are: BP 118/74 mmHg, HR 190 bpm regular, RR 18/min, SpO2 100% on room air. ECG demonstrates a narrow-complex tachycardia at 190 bpm with no visible P waves. What is the most appropriate first intervention for this patient? A) Vagal maneuvers B) IV adenosine 6 mg rapid push C) Synchronized cardioversion D) IV metoprolol 5 mg Answer: A – Vagal maneuvers Rationale: This patient has a stable narrow-complex tachycardia consistent with supraventricular tachycardia (SVT), likely AV nodal reentrant tachycardia (AVNRT) or AV reentrant tachycardia (AVRT). In hemodynamically stable patients with SVT, vagal maneuvers are the recommended first-line intervention due to their safety, non-invasiveness, and potential to terminate the arrhythmia by increasing parasympathetic tone and slowing AV nodal conduction. Vagal maneuvers include carotid sinus massage (if no carotid bruits present), Valsalva maneuver, and facial immersion in cold water. The modified Valsalva maneuver (supine position with passive leg raise) has been shown to increase success rates. If vagal maneuvers fail, IV adenosine is the next-line pharmacologic therapy, given as a 6 mg rapid IV push followed by a 20 mL saline flush, with higher doses (12 mg) if necessary. Synchronized cardioversion is reserved for unstable patients with hemodynamic compromise. IV metoprolol may be used for rate control but is not first-line in acute SVT management. Q8. A patient with a known 6.5 cm abdominal aortic aneurysm (AAA) presents with sudden onset of severe, tearing back pain, accompanied by nausea and diaphoresis. On examination, the patient is pale and diaphoretic. Blood pressure is 85/50 mmHg and heart rate is 135 bpm. Abdominal examination reveals a tender, pulsatile mass in the periumbilical region. What is the most likely diagnosis? A) Acute pancreatitis B) Renal colic C) Ruptured abdominal aortic aneurysm D) Acute mesenteric ischemia Answer: C – Ruptured abdominal aortic aneurysm Rationale: This patient’s presentation is a classic medical emergency—a ruptured abdominal aortic aneurysm (AAA). The triad of sudden severe back or abdominal pain, hypotension, and a pulsatile abdominal mass in a patient with known AAA is highly concerning for rupture. AAA rupture carries a mortality rate exceeding 80% and requires immediate surgical intervention. The pathophysiology involves weakening of the aortic wall, leading to progressive dilation and eventual rupture with hemorrhage into the retroperitoneal space. Risk factors include age 65, male gender, smoking, hypertension, and family history. Any patient with known AAA presenting with acute pain and hemodynamic instability should be considered to have a ruptured AAA until proven otherwise. Immediate surgical consultation and emergent operative repair or endovascular aneurysm repair (EVAR) is indicated. Bedside ultrasound can confirm the presence of AAA in unstable patients. Acute pancreatitis typically presents with epigastric pain radiating to the back, but hypotension and pulsatile mass are not characteristic. Renal colic presents with flank pain and hematuria. Mesenteric ischemia presents with abdominal pain out of proportion to examination findings. Q9. A 62-year-old male with a history of coronary artery disease and previous myocardial infarction presents with palpitations and lightheadedness. ECG demonstrates a wide QRS complex tachycardia at 150 bpm, with no visible P waves, and QRS duration of 0.14 seconds. He is awake and alert with stable vital signs: BP 110/72 mmHg, HR 150 bpm, RR 20/min, SpO2 96% on room air. What is the most appropriate next step in management? A) Immediate synchronized cardioversion B) IV amiodarone 150 mg over 10 minutes C) IV adenosine 6 mg rapid push D) IV lidocaine 1.5 mg/kg bolus Answer: B – IV amiodarone 150 mg over 10 minutes Rationale: This patient presents with stable monomorphic ventricular tachycardia (VT), characterized by a wide QRS complex (120 ms) tachycardia in a patient with structural heart disease. In hemodynamically stable patients with VT, IV amiodarone is the first-line antiarrhythmic agent. Amiodarone acts as a potassium channel blocker, prolonging repolarization and stabilizing the cardiac membrane. The recommended initial dose is 150 mg IV over 10 minutes, which can be repeated if necessary. Unlike lidocaine, which has lower efficacy in VT, amiodarone has been shown to be superior in termination of VT and prevention of recurrence. Synchronized cardioversion is indicated only for unstable VT with hemodynamic compromise (hypotension, altered mental status, chest pain, or heart failure). IV adenosine is not indicated for wide-complex tachycardia of unknown origin, as it is ineffective in VT and may be hazardous if the rhythm is pre-excited atrial fibrillation. If the patient were unstable, immediate synchronized cardioversion at 100-200 J biphasic would be appropriate.