Free CFRN Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation:

The correct answer is C because markedly diminished or absent breath sounds in a patient with severe asthma may indicate critically reduced airflow and impending respiratory failure.

Wheezing occurs when airflow passes through narrowed airways. In extremely severe obstruction, airflow may become insufficient to generate audible wheezing, creating a so-called silent chest.

This finding is particularly concerning when accompanied by hypoxemia, inability to speak, accessory muscle use, altered mental status, or signs of fatigue.

The child requires immediate escalation of respiratory support and aggressive treatment of severe bronchospasm.

Management may include repeated or continuous inhaled short-acting beta-agonists, inhaled anticholinergic therapy, systemic corticosteroids, and intravenous magnesium sulfate for severe exacerbations.

The flight nurse must closely assess respiratory effort, mental status, oxygenation, and ventilation.

Endotracheal intubation may become necessary when respiratory exhaustion, impaired consciousness, or inability to maintain adequate ventilation develops.

However, invasive ventilation carries risks of dynamic hyperinflation, hypotension, and barotrauma in severe asthma.

Option A may represent an expected medication effect rather than impending failure. Option B is nonspecific. Option D describes obstruction but lacks the severity indicated by minimal airflow and substantial hypoxemia.

CFRN examination relevance: Tests pediatric status asthmaticus, recognition of the silent chest, and respiratory failure assessment.

Comprehensive and Detailed Explanation:

The correct answer is C because treatment of diabetic ketoacidosis requires correction of ketone production and metabolic acidosis, not merely normalization of blood glucose.

Insulin suppresses lipolysis and hepatic ketogenesis, allowing circulating ketone concentrations to decrease.

Blood glucose may normalize before ketoacidosis resolves.

If insulin is discontinued prematurely, ongoing ketone production may continue and delay metabolic recovery.

Therefore, when glucose falls to an appropriate threshold but acidosis and ketosis persist, dextrose-containing fluids are commonly added so that insulin therapy can continue safely.

Option A is incorrect because glucose reduction alone does not establish resolution of diabetic ketoacidosis. Option B increases the risk of hypoglycemia and hypokalemia. Option D may worsen dehydration and impair recovery.

The flight nurse should monitor glucose, potassium, acid-base status, and ketone trends when available.

Treatment endpoints should follow current hyperglycemic crisis protocols and account for changes in bicarbonate, pH, and circulating ketones.

Transition to subcutaneous insulin requires appropriate overlap and confirmation that the acute metabolic crisis has resolved.

CFRN examination relevance: Evaluates diabetic ketoacidosis treatment endpoints, insulin continuation, and prevention of hypoglycemia during metabolic correction.

Comprehensive and Detailed Explanation:

The correct answer is B because neonatal sepsis may present with subtle, nonspecific signs that differ substantially from the manifestations commonly observed in older children and adults.

Newborns have immature immune responses and limited physiological reserves. Serious infection may cause temperature instability, poor feeding, lethargy, apnea, respiratory distress, abnormal heart rate, and impaired peripheral perfusion.

Hypothermia rather than fever may be an important sign of infection.

The infant's delayed capillary refill, tachycardia, lethargy, and apnea raise concern for systemic infection with evolving circulatory and respiratory compromise.

Immediate priorities include maintaining airway patency, providing appropriate respiratory support, preserving normal body temperature, and assessing glucose concentration.

Blood cultures should be obtained before antibiotics when doing so does not significantly delay treatment.

Empiric intravenous antimicrobial therapy should begin promptly according to neonatal sepsis protocols, with medication selection guided by age, clinical circumstances, local resistance patterns, and suspected pathogens.

Option A is incorrect because absence of fever does not exclude neonatal sepsis. Option C provides inadequate treatment for a critically ill neonate. Option D ignores potentially life-threatening apnea.

Fluid administration requires careful weight-based assessment because neonates are vulnerable to both inadequate resuscitation and fluid overload.

Continuous monitoring of oxygenation, heart rate, temperature, glucose, and perfusion is essential.

CFRN examination relevance: Evaluates neonatal sepsis recognition, atypical infection manifestations, respiratory stabilization, and early antimicrobial therapy.

Comprehensive and Detailed Explanation:

The correct answer is A because the patient has developed pulseless polymorphic ventricular tachycardia, a shockable cardiac arrest rhythm requiring immediate defibrillation.

Polymorphic ventricular tachycardia associated with QT prolongation is consistent with torsades de pointes. This rhythm may occur in patients with electrolyte disturbances, inherited repolarization abnormalities, or exposure to medications that prolong the QT interval.

When torsades causes cardiac arrest, treatment follows the shockable cardiac arrest algorithm, including unsynchronized defibrillation and high-quality chest compressions.

Intravenous magnesium sulfate is an important treatment for torsades de pointes because it can suppress early afterdepolarizations and reduce recurrence, even when the measured magnesium concentration is normal.

The team should also identify and correct contributing factors such as hypokalemia, hypomagnesemia, and QT-prolonging medications.

Option B is inappropriate because synchronization may be unreliable in polymorphic ventricular tachycardia, and the patient is pulseless. Option C is incorrect because adenosine is primarily used for selected supraventricular tachycardias. Option D may worsen cardiovascular instability and does not treat torsades-associated cardiac arrest.

The flight nurse must prioritize safe defibrillator operation, minimal interruptions in compressions, airway support, and rapid assessment of reversible causes.

CFRN examination relevance: Tests recognition of torsades de pointes, shockable rhythms, magnesium therapy, and advanced cardiovascular life support.

Comprehensive and Detailed Explanation:

The correct answer is D because high-voltage electrical injury can cause extensive internal tissue damage despite relatively small external wounds.

Electrical current passing through the body generates heat and may disrupt cellular membranes, blood vessels, nerves, and muscles.

The severity of injury depends on voltage, current pathway, contact duration, tissue resistance, and other exposure characteristics.

Deep muscle injury may cause rhabdomyolysis, releasing myoglobin, potassium, and intracellular enzymes into the circulation.

These abnormalities can contribute to acute kidney injury, hyperkalemia, and cardiovascular instability.

Electrical exposure may also produce cardiac dysrhythmias, particularly when current traverses the thorax.

Option A incorrectly assumes that visible skin injury reflects the full extent of damage. Option B overlooks deep tissue destruction. Option C ignores potential cardiac complications.

The flight nurse should perform appropriate cardiac monitoring, evaluate neurological and vascular function, and assess for increasing limb swelling or compartment pressure.

Fluid resuscitation and urine output monitoring may be important in patients with extensive muscle injury.

Definitive management may require burn surgery, vascular assessment, or fasciotomy.

CFRN examination relevance: Evaluates high-voltage electrical trauma, occult tissue injury, and systemic complications.