Free CFRN Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation:

The correct answer is C because oxygen planning is essential for transporting patients who depend on continuous respiratory support.

The volume of oxygen consumed varies according to the delivery system, prescribed flow, fraction of inspired oxygen, ventilator configuration, and equipment design.

High-flow systems may require substantial oxygen supplies, particularly when delivering high inspired oxygen concentrations.

For a mission lasting 75 minutes with a 30-minute contingency allowance, the nurse must plan for at least 105 minutes of expected requirements, while also considering equipment-specific reserves and potential delays.

A simple time calculation may be insufficient if the system uses oxygen entrainment, internal mixing, or another configuration affecting consumption.

The available oxygen volume must be calculated using the cylinder's usable capacity, pressure, applicable conversion factor, and minimum reserve requirements.

Option A is incorrect because respiratory rate alone does not determine oxygen-system consumption. Option B ignores the relationship between cylinder pressure and available supply. Option D incorrectly treats different oxygen delivery technologies as having identical consumption.

The flight nurse should verify oxygen connections, regulators, alarms, and backup delivery options.

Oxygen reserves must also account for potential increases in patient requirements during deterioration.

CFRN examination relevance: Evaluates aeromedical oxygen calculations, equipment requirements, reserve planning, and continuity of respiratory support.

Comprehensive and Detailed Explanation:

The correct answer is A because the newborn has symptomatic severe hypoglycemia requiring immediate intervention.

Infants born to mothers with diabetes are at increased risk of neonatal hypoglycemia because maternal hyperglycemia can stimulate fetal pancreatic insulin production.

After delivery, maternal glucose delivery stops abruptly, but elevated neonatal insulin secretion may persist.

This can produce a rapid decrease in blood glucose during the early postnatal period.

Neurological manifestations may include jitteriness, lethargy, poor feeding, abnormal cry, seizures, and apnea.

Severe hypoglycemia can impair cerebral energy metabolism and potentially cause neurological injury if prolonged.

Intravenous dextrose is appropriate for symptomatic severe hypoglycemia, with dosing and subsequent infusion determined by neonatal protocols.

Option B is incorrect because symptomatic hypoglycemia is not a harmless physiological finding. Option C would worsen hypoglycemia. Option D could aggravate inadequate glucose availability.

The flight nurse should verify glucose response through repeated measurements and monitor for recurrent hypoglycemia.

Respiratory support, temperature control, and appropriate nutritional planning are also important because cold stress and increased metabolic demand can worsen glucose instability.

CFRN examination relevance: Evaluates neonatal hypoglycemia, infants of diabetic mothers, glucose metabolism, and emergency neonatal stabilization.

Comprehensive and Detailed Explanation:

The correct answer is B because a simple febrile seizure is typically a generalized seizure occurring in a developmentally appropriate child between approximately six months and five years of age, associated with fever and without evidence of central nervous system infection.

Simple febrile seizures generally last less than 15 minutes, occur once within a 24-hour period, and do not produce persistent focal neurological abnormalities.

The child's brief generalized seizure and return toward baseline consciousness are consistent with this pattern.

The flight nurse must nevertheless perform a careful assessment for meningitis, encephalitis, metabolic abnormalities, persistent altered consciousness, or other concerning conditions.

Option A is incorrect because lumbar puncture is not routinely required for every simple febrile seizure; the decision depends on clinical findings and individual risk factors. Option C is inappropriate because a simple febrile seizure does not establish epilepsy. Option D ignores the importance of postictal assessment.

Management includes supportive care, monitoring of airway and ventilation, and evaluation of the underlying fever.

If another prolonged seizure occurs, emergency benzodiazepine therapy may become necessary.

CFRN examination relevance: Evaluates pediatric seizure classification, febrile seizures, and neurological risk assessment.

Comprehensive and Detailed Explanation:

The correct answer is B because hepatic encephalopathy is a neuropsychiatric complication of liver dysfunction and portosystemic shunting.

Reduced hepatic detoxification permits substances such as ammonia to accumulate and contribute to altered cerebral function.

Clinical manifestations range from subtle behavioral changes and sleep disturbances to asterixis, confusion, severe somnolence, and coma.

Lactulose is a commonly used first-line therapy because it promotes intestinal ammonia elimination through acidification of colonic contents and increased stool passage.

Treatment is generally adjusted to achieve an appropriate number of soft bowel movements while avoiding excessive diarrhea, dehydration, and electrolyte disturbances.

The flight nurse should also evaluate potential precipitating factors such as gastrointestinal bleeding, infection, constipation, renal dysfunction, electrolyte abnormalities, and sedating medications.

Option A is incorrect because routine anticoagulation does not treat hepatic encephalopathy. Option C may worsen consciousness and compromise airway protection. Option D is inappropriate because prolonged severe protein restriction can worsen malnutrition and is not recommended as the principal management strategy.

Ammonia concentrations may support assessment but do not independently establish the diagnosis or reliably correlate with clinical severity.

During transport, airway protection, glucose monitoring, neurological reassessment, and identification of reversible contributors are essential.

CFRN examination relevance: Evaluates hepatic encephalopathy, metabolic neurological dysfunction, lactulose therapy, and precipitating-factor assessment.

Comprehensive and Detailed Explanation:

The correct answer is A because restoration of arterial flow after a period of limb ischemia can produce reperfusion-related tissue swelling and increase the risk of acute compartment syndrome.

Ischemic tissues develop cellular dysfunction, endothelial injury, and increased capillary permeability. When circulation is restored, fluid may accumulate within muscle compartments enclosed by relatively noncompliant fascia.

Increasing intracompartmental pressure can impair capillary perfusion, creating recurrent tissue ischemia despite successful repair of the injured artery.

Severe pain, pain with passive stretching, tense swelling, and progressive sensory abnormalities are important findings.

A repaired artery or palpable distal pulse does not exclude compartment syndrome because microvascular perfusion may be compromised before major arterial flow disappears.

Option B may increase external compression and worsen perfusion. Option C can reduce arterial driving pressure to the injured tissues. Option D does not relieve elevated compartment pressure and may increase bleeding risk.

The flight nurse should promptly communicate the findings to the receiving vascular and trauma teams.

Definitive treatment generally requires urgent fasciotomy when compartment syndrome is established.

Repeated documentation of pain, sensation, motor function, swelling, and distal perfusion is essential.

CFRN examination relevance: Evaluates vascular trauma, reperfusion injury, compartment syndrome, and threatened limb viability.