Free CFRN Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation:

The correct answer is A because emergency medical treatment may proceed under an exception to ordinary informed consent requirements when immediate care is necessary to prevent serious harm and valid consent cannot reasonably be obtained.

Decision-making capacity is specific to the decision and clinical circumstances. Aphasia alone does not automatically establish incapacity because some patients retain understanding and can communicate through alternative methods.

However, the scenario specifies that this patient cannot demonstrate understanding of the proposed transfer.

When a patient lacks decision-making capacity, the clinical team should ordinarily seek consent from an authorized representative.

If no representative is available and delaying treatment creates a serious risk of irreversible injury, emergency consent principles may permit necessary treatment.

The legal requirements vary by jurisdiction, and the flight nurse should follow applicable law, medical direction, and institutional procedures.

Option B may cause avoidable treatment delays. Option C is inappropriate because an unrelated visitor has no automatic legal authority. Option D incorrectly equates a communication impairment with permanent incapacity.

Documentation should include the patient's condition, assessment of capacity, attempts to contact an authorized representative, urgency of intervention, and clinical justification.

CFRN examination relevance: Evaluates ethical decision-making, informed consent, emergency exceptions, and patient advocacy during time-sensitive transport.

Comprehensive and Detailed Explanation:

The correct answer is C because the anion gap is calculated using the concentrations of sodium, chloride, and bicarbonate.

The commonly used formula is:

\[ \text{Anion Gap}=Na^+-(Cl^-+HCO_3^-) \]

Substituting the provided values:

\[ 140-(102+9)=29\ \text{mEq/L} \]

An anion gap of 29 mEq/L is substantially elevated above the typical reference range, although laboratory-specific normal values and serum albumin concentration must be considered.

The low pH and bicarbonate identify a primary metabolic acidosis.

An elevated anion gap suggests accumulation of unmeasured acids, which may result from lactic acidosis, ketoacidosis, renal failure, or certain toxic ingestions.

The patient's chronic kidney disease raises concern for retention of organic acids and impaired renal acid excretion.

Option A contains an incorrect calculation. Option B gives an incorrect value and does not identify the primary metabolic disorder. Option D incorrectly classifies acidemia as alkalosis.

The flight nurse should evaluate potassium, renal function, perfusion, medication exposure, and possible reversible causes.

The PaCO₂ should also be assessed against expected respiratory compensation to identify an additional respiratory disorder.

CFRN examination relevance: Tests anion gap calculation, metabolic acidosis interpretation, and renal-related acid-base disturbances.

Comprehensive and Detailed Explanation:

The correct answer is B because the clinical findings strongly suggest tension pneumothorax, a rapidly life-threatening form of obstructive shock. In this condition, accumulating air within the pleural space increases intrathoracic pressure, compromises lung expansion, and impairs venous return to the heart.

Patients receiving positive-pressure ventilation are particularly vulnerable because ventilation may accelerate pleural air accumulation when a pulmonary or chest wall injury is present.

Typical manifestations include sudden hypoxemia, hypotension, diminished or absent unilateral breath sounds, increased airway pressures, and difficulty delivering ventilation. Tracheal deviation and distended neck veins are inconsistent or late findings and should not be required before initiating treatment.

An unstable patient with a suspected tension pneumothorax requires immediate pleural decompression rather than delayed diagnostic imaging. Depending on scope of practice, available equipment, and clinical protocols, treatment may involve needle decompression or finger thoracostomy, followed by definitive pleural drainage when appropriate.

Option A may worsen intrathoracic pressure and cardiovascular compromise. Option C does not address the underlying mechanical obstruction. Option D is unsafe because delayed intervention may result in cardiovascular collapse or cardiac arrest.

The flight nurse should also rapidly evaluate other causes of sudden ventilator deterioration, including equipment malfunction, endotracheal tube displacement, and obstruction.

CFRN examination relevance: Recognition and emergency treatment of tension pneumothorax are essential components of thoracic trauma and obstructive shock management.