Certified Emergency Nurse (CEN) Examination — Questions and Answers

Question 1: A trauma patient has a GCS of 8. After intubation, the nurse should set initial ventilator settings to target a PaCO2 of:

50-55 mmHg
20-25 mmHg
25-30 mmHg
35-45 mmHg (Correct answer)

Correct answer: 35-45 mmHg

Normal PaCO2 (35-45 mmHg) is targeted unless signs of herniation require brief hyperventilation; routine hyperventilation is no longer recommended in TBI.

Question 2: A hospital is considering activating its shelter-in-place protocol. Which disaster scenario MOST warrants this response?

A structural fire in the hospital's east wing
An approaching category 3 hurricane requiring regional evacuation
A prolonged power outage affecting the entire city block
An outdoor chemical plume drifting toward the hospital from a nearby plant (Correct answer)

Correct answer: An outdoor chemical plume drifting toward the hospital from a nearby plant

Shelter-in-place is most appropriate when moving patients outside would increase exposure risk, such as with an approaching outdoor chemical release.

Question 3: Which toxic ingestion classically causes a 'toxidrome gap' — meaning a wide anion gap metabolic acidosis with an elevated osmol gap?

Lithium toxicity
Ethylene glycol ingestion (Correct answer)
Isoniazid toxicity
Salicylate overdose

Correct answer: Ethylene glycol ingestion

Ethylene glycol is metabolized to glycolic and oxalic acids, causing both an elevated osmol gap (unmeasured osmoles) and anion gap acidosis.

Question 4: Which finding is MOST concerning for cyanide toxicity in a patient rescued from a house fire?

Singed nasal hairs and hoarse voice
Carboxyhemoglobin level of 25%
Persistent lactic acidosis despite high-flow oxygen (Correct answer)
PaO2 of 55 mmHg on room air

Correct answer: Persistent lactic acidosis despite high-flow oxygen

Persistent lactic acidosis unresponsive to oxygen indicates cellular hypoxia from cyanide inhibiting cytochrome oxidase, not just carbon monoxide toxicity.

Question 5: An ED nurse disagrees with a physician's plan for an elderly patient who appears to lack decision-making capacity and has no documented advance directive. The best action is to:

Document disagreement in the chart and take no further action
Invoke the chain of command and request ethics consultation if the plan appears contrary to the patient's best interests (Correct answer)
Follow the physician's orders without question
Contact the patient's family directly to override the physician

Correct answer: Invoke the chain of command and request ethics consultation if the plan appears contrary to the patient's best interests

When a patient lacks capacity and no directive exists, the chain of command and ethics consultation ensure decisions align with the patient's best interests.

Question 6: Why is continuing education important in Toxicology?

Only for re-certification requirements
To stay current with evolving standards and practices (Correct answer)
It is not important after certification
To network only

Correct answer: To stay current with evolving standards and practices

Continuing education keeps professionals updated with the latest developments, standards, and best practices in their field.

Question 7: Which finding is MOST consistent with serotonin syndrome rather than neuroleptic malignant syndrome?

Lead-pipe rigidity
Hyperthermia over 41°C
Diaphoresis with normal reflexes
Clonus and hyperreflexia (Correct answer)

Correct answer: Clonus and hyperreflexia

Clonus and hyperreflexia are hallmark features of serotonin syndrome, distinguishing it from NMS which presents with lead-pipe rigidity.

Question 8: Which ABG pattern is most consistent with acute respiratory failure (Type 1)?

pH 7.38, PaCO2 40, PaO2 58
pH 7.48, PaCO2 30, PaO2 55 (Correct answer)
pH 7.32, PaCO2 50, PaO2 60
pH 7.30, PaCO2 55, PaO2 80

Correct answer: pH 7.48, PaCO2 30, PaO2 55

Type 1 (hypoxemic) respiratory failure is characterized by low PaO2 with normal or low PaCO2 due to ventilation-perfusion mismatch.

Question 9: Which of the following is the priority intervention for a patient with a suspected spinal cord injury?

IV methylprednisolone bolus
Spinal immobilization (Correct answer)
Immediate MRI
Lumbar puncture

Correct answer: Spinal immobilization

Spinal immobilization is the immediate priority to prevent secondary injury from movement before definitive imaging and diagnosis.

Question 10: A patient presents with lithium toxicity. Which clinical finding indicates severe neurotoxicity requiring urgent intervention?

Polyuria and polydipsia
Coarse tremor with cerebellar ataxia and altered mental status (Correct answer)
Nausea and vomiting
Fine hand tremor

Correct answer: Coarse tremor with cerebellar ataxia and altered mental status

Coarse tremor, cerebellar ataxia, and altered mental status indicate severe lithium neurotoxicity, which may require hemodialysis to prevent permanent neurological damage.

Question 11: What does informed consent require?

Verbal agreement only
Getting any signature on a form
Family approval only
Explaining the procedure, risks, benefits, and alternatives to the patient (Correct answer)

Correct answer: Explaining the procedure, risks, benefits, and alternatives to the patient

Informed consent requires that patients understand the proposed procedure, its risks and benefits, alternatives, and have the opportunity to ask questions before agreeing.

Question 12: Which diagnostic test is the gold standard for confirming pulmonary embolism?

D-dimer blood test
VQ scan
Chest X-ray
CT pulmonary angiography (CTPA) (Correct answer)

Correct answer: CT pulmonary angiography (CTPA)

CT pulmonary angiography is the gold standard for diagnosing PE due to its high sensitivity, specificity, and wide availability.

Question 13: What are standard precautions in healthcare?

Only wearing gloves for known infections
Using masks during surgery only
Hand washing after patient contact only
Treating all blood and body fluids as potentially infectious (Correct answer)

Correct answer: Treating all blood and body fluids as potentially infectious

Standard precautions assume all blood and body fluids are potentially infectious, requiring consistent use of barriers (gloves, gowns, masks) and hand hygiene for all patient interactions.

Question 14: During transcutaneous pacing, the nurse notes electrical capture but the patient remains unresponsive. What is the most likely explanation?

Lead placement is incorrect
Mechanical capture has not been achieved (Correct answer)
The pacing rate is too slow
The pacemaker output is set too low

Correct answer: Mechanical capture has not been achieved

Electrical capture (pacing spikes followed by wide QRS) does not guarantee mechanical capture; mechanical capture must be confirmed by a palpable pulse or improved blood pressure.

Question 15: A patient with inferior STEMI and RV infarction develops hypotension. Which intervention is contraindicated?

Dopamine infusion
Nitroglycerin administration (Correct answer)
Norepinephrine infusion
Normal saline 500 mL IV bolus

Correct answer: Nitroglycerin administration

Nitroglycerin is contraindicated in RV infarction because the RV is preload-dependent, and reducing venous return can precipitate severe hypotension.

Question 16: A patient with suspected opioid overdose has a respiratory rate of 4 breaths/min and pinpoint pupils. What is the correct initial naloxone dose?

2 mg IV given as a single bolus
0.4 mg IV/IM, repeat every 2-3 minutes as needed (Correct answer)
0.01 mg/kg IV for weight-based dosing only
0.1 mg IV titrated slowly

Correct answer: 0.4 mg IV/IM, repeat every 2-3 minutes as needed

Standard initial naloxone dosing is 0.4 mg IV/IM, titrated to adequate respirations, with repeat doses every 2-3 minutes if needed.

Question 17: Which lab finding is most indicative of acute hepatic failure in the emergency setting?

ALT 200 IU/L with normal bilirubin
Alkaline phosphatase three times upper normal limit
Elevated ammonia with coagulopathy (INR > 1.5) and encephalopathy (Correct answer)
Total bilirubin 4.0 mg/dL with pruritus

Correct answer: Elevated ammonia with coagulopathy (INR > 1.5) and encephalopathy

Acute hepatic failure is defined by coagulopathy and encephalopathy in the absence of pre-existing liver disease, with hyperammonemia contributing to mental status changes.

Question 18: Raccoon eyes (periorbital ecchymosis) bilaterally in a trauma patient suggest what injury?

Anterior basilar skull fracture (Correct answer)
Orbital blowout fracture
Facial fracture only
Temporal lobe contusion

Correct answer: Anterior basilar skull fracture

Bilateral periorbital bruising ('raccoon eyes') is a classic delayed sign of an anterior basilar skull fracture.

Question 19: When implementing a new evidence-based protocol in the ED, the charge nurse should FIRST:

Roll out the protocol hospital-wide on the first day
Wait until all staff voluntarily agree to adopt the new protocol
Educate staff on the evidence base and rationale for the change before implementation (Correct answer)
Implement immediately and evaluate outcomes retrospectively

Correct answer: Educate staff on the evidence base and rationale for the change before implementation

Educating staff on the evidence and rationale before implementation increases understanding, compliance, and the likelihood of successful sustained change.

Question 20: A COPD patient presents with worsening dyspnea and a PaCO2 of 65 mmHg. What ventilatory support should be initiated first?

Non-invasive positive pressure ventilation (NIPPV/BiPAP) (Correct answer)
Nasal cannula at 2 L/min only
Simple face mask at 15 L/min
Immediate intubation

Correct answer: Non-invasive positive pressure ventilation (NIPPV/BiPAP)

BiPAP is the preferred initial ventilatory support for hypercapnic COPD exacerbations, reducing the need for intubation.

Question 21: During a pandemic surge, a hospital implements crisis standards of care. This means:

All patients receive the same level of care as non-disaster conditions
Care delivery is adjusted based on available resources to provide best outcomes for the most patients (Correct answer)
Only critically ill patients receive treatment
Triage is suspended and all patients are admitted

Correct answer: Care delivery is adjusted based on available resources to provide best outcomes for the most patients

Crisis standards of care involve systematically adjusting practices to optimize outcomes across the patient population when resources are severely strained.

Question 22: A newly certified emergency nurse asks about the value of obtaining the CEN credential. Which response is MOST accurate?

CEN certification is legally required to work in any emergency department in the US
CEN certification validates specialty knowledge and is associated with improved patient outcomes and professional recognition (Correct answer)
CEN certification guarantees salary increases at all institutions
CEN certification only benefits nurses who plan to become managers

Correct answer: CEN certification validates specialty knowledge and is associated with improved patient outcomes and professional recognition

The CEN credential demonstrates validated emergency nursing expertise and is associated with professional credibility, improved patient safety, and career advancement.

Question 23: A patient presents with a sudden onset of the 'worst headache of my life.' Which condition must be ruled out FIRST?

Subarachnoid hemorrhage (SAH) (Correct answer)
Meningitis
Migraine
Hypertensive urgency

Correct answer: Subarachnoid hemorrhage (SAH)

A thunderclap headache described as the worst ever is the classic presentation of subarachnoid hemorrhage until proven otherwise.

Question 24: Which finding in a pediatric patient is most indicative of increased intracranial pressure (ICP)?

Cushing's triad (bradycardia, hypertension, irregular respirations) (Correct answer)
Bilateral pinpoint pupils
Fever and nuchal rigidity
Tachycardia with hypotension

Correct answer: Cushing's triad (bradycardia, hypertension, irregular respirations)

Cushing's triad is a late sign of critically elevated ICP and indicates impending herniation.

Question 25: A patient with ischemic stroke arrives within 2 hours of symptom onset. What is the first-line pharmacological intervention if eligible?

Heparin infusion
Warfarin loading dose
IV alteplase (tPA) (Correct answer)
Aspirin 325 mg

Correct answer: IV alteplase (tPA)

IV alteplase (tPA) is the standard fibrinolytic therapy for eligible ischemic stroke patients within the 3–4.5 hour window.

Question 26: During a mass casualty incident, which principle guides the decision to tag a patient as Expectant (Black) rather than Immediate (Red)?

Patient's expressed wishes for treatment
Severity of injuries relative to available resources (Correct answer)
Arrival order at the triage area
Patient's age and pre-existing conditions

Correct answer: Severity of injuries relative to available resources

Expectant tagging is resource-based; injuries that would consume disproportionate resources with low survival probability are classified Black to maximize overall survivor count.

Question 27: Certification as a Certified Emergency Nurse (CEN) is BEST described as a demonstration of:

Completion of an emergency nursing orientation program
Licensure to practice nursing in the emergency setting
Seniority and years of experience in emergency nursing
Specialty knowledge and competence in emergency nursing validated by examination (Correct answer)

Correct answer: Specialty knowledge and competence in emergency nursing validated by examination

CEN certification validates specialty-level knowledge and competency through a standardized examination administered by BCEN.

Question 28: When assessing a patient with suspected ectopic pregnancy, which finding requires the most immediate intervention?

Mild lower abdominal pain with normal vital signs
Positive urine pregnancy test with nausea
Hypotension, tachycardia, and peritoneal signs (Correct answer)
Vaginal spotting with closed cervical os

Correct answer: Hypotension, tachycardia, and peritoneal signs

Hypotension, tachycardia, and peritoneal signs indicate ruptured ectopic pregnancy with hemorrhagic shock requiring emergency surgical intervention.

Question 29: Which finding is most indicative of a tension pneumothorax in a trauma patient?

Subcutaneous emphysema with equal breath sounds
Tracheal deviation away from the affected side with absent breath sounds (Correct answer)
Hemoptysis and tachycardia
Bilateral crackles and SpO2 88%

Correct answer: Tracheal deviation away from the affected side with absent breath sounds

Tracheal deviation away from the affected side combined with absent breath sounds on that side is the classic presentation of tension pneumothorax.

Question 30: A nurse working in the emergency department identifies a systemic staffing issue that compromises patient safety. Which action best reflects professional advocacy?

Resign from the position and seek employment elsewhere
Discuss concerns only with coworkers during breaks
Document the issue and formally report it to nursing leadership and administration (Correct answer)
Accept the situation to avoid conflict with management

Correct answer: Document the issue and formally report it to nursing leadership and administration

Professional advocacy requires nurses to formally report systemic safety concerns through appropriate channels, driving organizational change for patient safety.

Question 31: How does documentation support quality in Disaster Preparedness?

It creates records, ensures consistency, and enables improvement (Correct answer)
It is only for billing
Documentation is unnecessary overhead
It only serves administrative purposes

Correct answer: It creates records, ensures consistency, and enables improvement

Proper documentation creates accountability, ensures consistency, supports quality improvement, and provides legal protection.

Certified Emergency Nurse (CEN) Examination

The CEN exam, administered by the Board of Certification for Emergency Nursing (BCEN), validates specialized knowledge and clinical skills across 10 emergency nursing domains including cardiovascular, respiratory, neurological, and other emergency care competencies.

Questions

35 min

Time Limit

71%

To Pass

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