Free CFRN Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation:

The correct answer is A because certain intravenous medications can interact with administration materials, affecting the amount of active medication delivered to the patient.

Nitroglycerin may be absorbed by some types of polyvinyl chloride tubing, potentially reducing the delivered dose compared with the programmed infusion.

The extent of drug loss can depend on tubing composition, length, flow rate, concentration, and duration of infusion.

Using appropriate low-sorption tubing helps improve consistency of medication delivery.

Before transport, the flight nurse should confirm the prescribed concentration, pump settings, tubing compatibility, medication labeling, and the patient's hemodynamic response.

Option B is inappropriate because increasing infusion rates without evaluating the cause of reduced drug delivery can produce excessive dosing once equipment is corrected. Option C creates additional compatibility risks. Option D ignores the need for continuous blood pressure and cardiac monitoring.

Nitroglycerin causes venodilation and, at higher doses, arterial vasodilation, potentially reducing myocardial oxygen demand.

Excessive administration can produce hypotension and compromise coronary perfusion.

The nurse should evaluate symptoms, blood pressure, cardiac rhythm, and medication effects throughout transport.

CFRN examination relevance: Evaluates medication-device compatibility, nitroglycerin infusion safety, and prevention of drug-delivery errors.

Comprehensive and Detailed Explanation:

The correct answer is C because apnea of prematurity results primarily from immaturity of the respiratory control mechanisms in preterm infants.

Premature neonates may exhibit reduced sensitivity to carbon dioxide, unstable respiratory rhythm generation, and immature coordination of respiratory muscle activity.

Apnea may be accompanied by bradycardia and oxygen desaturation, potentially compromising cerebral and systemic oxygen delivery.

Caffeine citrate is a commonly used methylxanthine medication that stimulates central respiratory activity and reduces the frequency of apnea episodes.

Its effects include increased respiratory drive, improved diaphragmatic activity, and reduced susceptibility to respiratory pauses.

Before attributing apnea solely to prematurity, the flight nurse must assess alternative causes such as infection, hypoglycemia, hypothermia, airway obstruction, seizures, and medication effects.

Option A does not address the underlying respiratory immaturity. Option B is not a treatment for central apnea. Option D may worsen bradycardia and is inappropriate.

The transport team should continue cardiorespiratory monitoring and evaluate whether CPAP remains adequate.

Persistent apnea requiring repeated stimulation or associated with significant desaturation may necessitate assisted ventilation.

Caffeine dosing and monitoring should follow neonatal protocols and account for prior doses.

CFRN examination relevance: Evaluates neonatal respiratory control, apnea of prematurity, caffeine therapy, and preterm transport stabilization.

Comprehensive and Detailed Explanation:

The correct answer is C because the patient's presentation is characteristic of adrenal crisis, an acute, life-threatening condition caused by inadequate glucocorticoid activity during physiological stress.

Patients with established adrenal insufficiency may develop adrenal crisis during infection, surgery, trauma, or other significant illnesses, particularly when maintenance glucocorticoid doses are not appropriately increased.

Clinical manifestations include severe hypotension, dehydration, nausea, vomiting, altered mental status, hypoglycemia, and electrolyte abnormalities.

In primary adrenal insufficiency, mineralocorticoid deficiency can contribute to hyponatremia and hyperkalemia.

Immediate treatment generally includes intravenous hydrocortisone, isotonic crystalloid resuscitation, correction of hypoglycemia, and treatment of the precipitating condition.

For adults with suspected adrenal crisis, an initial hydrocortisone dose of 100 mg intravenously or intramuscularly is commonly recommended, followed by appropriate ongoing stress-dose therapy.

Treatment should not be delayed while waiting for confirmatory cortisol testing when adrenal crisis is strongly suspected.

Option A may worsen hypovolemia and circulatory instability. Option B does not treat acute cortisol deficiency. Option D is unsafe because the patient already has hypoglycemia; potassium management must account for the glucose concentration and immediate cardiac risk.

The flight nurse should monitor hemodynamic response, blood glucose, cardiac rhythm, electrolytes, and mental status while facilitating definitive medical management.

CFRN examination relevance: Evaluates endocrine emergencies, adrenal crisis recognition, electrolyte abnormalities, and emergency corticosteroid therapy.

Comprehensive and Detailed Explanation:

The correct answer is A because drowning-related injury primarily results from impaired gas exchange and hypoxia caused by submersion or immersion in liquid.

Aspiration can disrupt pulmonary surfactant, impair alveolar function, and produce ventilation-perfusion abnormalities.

The child may develop noncardiogenic pulmonary edema, reduced lung compliance, and acute respiratory distress.

Persistent hypoxemia, tachypnea, crackles, and altered consciousness indicate significant respiratory involvement requiring immediate assessment and support.

Supplemental oxygen should be titrated according to oxygenation, and advanced respiratory support may be necessary if the child cannot maintain adequate ventilation or oxygenation.

The flight nurse should monitor respiratory effort, neurological status, cardiac rhythm, temperature, and hemodynamic stability.

Option B is incorrect because routine prophylactic antibiotics are not recommended solely because drowning occurred. Antibiotics may be considered when there is evidence of infection or exposure to heavily contaminated water.

Option C is inappropriate because abdominal compressions do not effectively remove aspirated water and may increase the risk of vomiting and aspiration.

Option D is unsafe because respiratory complications may persist or evolve despite restoration of spontaneous breathing.

Hypothermia should be recognized and managed appropriately, especially after prolonged exposure to cold water.

CFRN examination relevance: Tests pediatric drowning-related respiratory injury, hypoxemia management, and prevention of secondary complications.

Comprehensive and Detailed Explanation:

The correct answer is A because Wernicke encephalopathy is an acute neurological disorder caused by thiamine deficiency.

Thiamine, or vitamin B1, is essential for several enzymatic reactions involved in cerebral carbohydrate metabolism and energy production.

Thiamine deficiency impairs neuronal metabolism and can produce characteristic neurological abnormalities, including altered mental status, gait or truncal ataxia, and ocular motor dysfunction.

Although this triad is classically described, all three findings are not present in every patient.

Risk factors include chronic alcohol misuse, prolonged malnutrition, persistent vomiting, bariatric surgery, and other conditions associated with inadequate nutrient intake or absorption.

Wernicke encephalopathy is primarily a clinical diagnosis, and treatment should not be delayed for confirmatory neuroimaging or laboratory results.

Prompt parenteral thiamine administration is essential because untreated disease can progress to irreversible neurological injury and Korsakoff syndrome.

Option B is inappropriate because the patient is not hyperglycemic and insulin would not treat thiamine deficiency. Option C unnecessarily delays treatment. Option D may be appropriate for certain alcohol withdrawal manifestations but does not correct Wernicke encephalopathy.

If the patient has hypoglycemia, emergency glucose administration should not be delayed; thiamine should be provided promptly alongside appropriate metabolic resuscitation.

The flight nurse should monitor neurological status, airway safety, glucose, and electrolyte abnormalities, particularly magnesium deficiency.

CFRN examination relevance: Evaluates metabolic neurological emergencies, thiamine deficiency, and clinical recognition of Wernicke encephalopathy.