The CTRN (Certified Transport Registered Nurse) is a nursing certification awarded by BCEN.
BCEN publishes the official exam outline, eligibility rules and fees — see BCEN's official page before you book.
Twenty CTRN (Certified Transport Registered Nurse) questions, with the answers hidden until you want them — covering Pathology, Management, Procedures, Pharmacology and more. They are real cards from our 1050-card deck, not the 30 on the free preview page, so you can use both. Work through them cold, then use your score below to decide what to study next. BCEN publishes the official exam outline — check it for the real blueprint.
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In refractory cardiogenic shock, what is the primary physiological rationale for the early initiation of Veno-Arterial (VA) ECMO over high-dose dual vasopressors?
Show answer →VA-ECMO provides both circulatory support (bypassing the heart) and respiratory support (gas exchange), whereas high-dose vasopressors significantly increase myocardial oxygen demand (MVO2) and afterload, which can worsen myocardial ischemia and stun the failing heart. VA-ECMO allows for myocardial rest by decreasing the workload of the LV. BCEN Tip: VA-ECMO is for Heart and Lungs (circulatory failure), while VV-ECMO is for Lungs Only (respiratory failure with stable CO). VA-ECMO requires arterial cannulation and carries a risk of North-South Syndrome (Harlequin Syndrome).
A trauma patient with a suspected C5 injury has a MAP of 55. What is the 2026 guideline-concordant MAP target for the first 7 days of transport and acute care?
Show answer →MAP 85-90 mmHg. Rationale: Maintaining higher perfusion pressure is critical to prevent secondary ischemic injury to the spinal cord (optimizing spinal cord perfusion pressure). CTRN Strategy: While 65 is standard for most shocks, neurogenic shock/SCI requires higher targets. Use vasopressors (Norepinephrine or Phenylephrine) if fluids fail.
A patient presents with muffled heart sounds, JVD, and hypotension. During inspiration, the systolic BP drops by 14 mmHg. What is the name of this BP phenomenon and the underlying diagnosis?
Show answer →The phenomenon is Pulsus Paradoxus (a drop in SBP >10 mmHg during inspiration), and the diagnosis is Cardiac Tamponade (Beck's Triad: Muffled heart sounds, JVD, Hypotension). In tamponade, fluid in the pericardial sac creates obstructive shock by limiting ventricular filling. During inspiration, increased venous return to the right heart further compresses the left ventricle (interventricular dependence), causing the exaggerated drop in SBP. CTRN Tip: Differentiate from Tension PTX by the presence of bilateral (though perhaps diminished) breath sounds.
You observe the following vitals in a head-injured patient: HR 48, BP 190/60, and irregular, shallow respirations. What is this triad called, and what does it signify in the context of TBI?
Show answer →Cushing's Triad (Bradycardia, Widened Pulse Pressure/Systolic Hypertension, and Irregular Respirations). SIGNIFICANCE: This is a LATE sign of increased ICP and impending brainstem herniation. PATHOPHYSIOLOGY: Increased ICP exceeds MAP, triggering a massive sympathetic response to increase SBP to maintain CPP (systolic HTN). Baroreceptors then trigger the parasympathetic system to slow the HR (bradycardia). EXAM TIP: Do not wait for Cushing's Triad to intervene; it often appears just before terminal herniation.
To prevent secondary brain injury in a 45-year-old TBI patient, what is the minimum Systolic Blood Pressure (SBP) and PaO2 threshold required during transport according to current 2026 standards?
Show answer →SBP ≥ 110 mmHg and PaO2 ≥ 60 mmHg (or SpO2 ≥ 94%). RATIONALE: Secondary brain injury is caused by hypotension, hypoxia, hypercarbia, and fever. In patients aged 15-49 or >70, SBP should be ≥ 110 mmHg. For patients 50-69, SBP ≥ 100 mmHg is often cited. CTRN FOCUS: Hypotension is the single most significant predictor of poor outcome in TBI. One single drop in SBP < 90 doubles mortality.
A patient has a MAP of 90 mmHg and an ICP of 25 mmHg. According to neurocritical care guidelines, what is the calculated CPP, and is this value adequate for a patient with a TBI?
Show answer →CPP = 65 mmHg (MAP 90 - ICP 25). Standard guidelines recommend maintaining CPP between 60-70 mmHg. Rational: Values <60 mmHg risk cerebral ischemia, while values >70 mmHg may increase the risk of ARDS and cerebral edema due to hyperperfusion. CTRN Focus: You must know the formula and the target range. In transport, aggressive fluid resuscitation or vasopressors may be needed to maintain MAP if ICP cannot be lowered.
Explain the specific hemodynamic mechanism leading to pulseless electrical activity (PEA) in a patient with an untreated tension pneumothorax.
Show answer →Obstructive Shock. Patho: Increased intrapleural pressure shifts the mediastinum, causing kinking of the superior and inferior vena cava. This leads to a precipitous drop in venous return (preload). Despite the heart's electrical activity and attempt to contract, there is insufficient volume to generate a stroke volume/cardiac output, resulting in PEA. Exam Strategy: Differentiate this from hypovolemic shock (low volume) vs. obstructive shock (mechanical blockage of flow). Treatment is immediate decompression, not just fluids.
You are transporting a patient on SIMV. You notice the patient’s spontaneous breaths are very shallow with a high respiratory rate, despite a normal mandatory rate. What is the physiological disadvantage of SIMV in this scenario?
Show answer →SIMV can significantly increase the Work of Breathing (WOB). While mandatory breaths are supported, spontaneous breaths are not unless Pressure Support (PS) is added. Small-diameter ETTs create high resistance. Without PS, the patient may fatigue (the staircase effect of shallow/fast breaths), leading to weaning failure. BCEN emphasizes adding PS to SIMV to overcome ETT resistance and prevent diaphragmatic fatigue during long transports.
While on PRVC, your patient begins to cough violently. What is the immediate risk regarding tidal volume delivery, and how does the ventilator respond to the high-pressure spike?
Show answer →PRVC uses the previous breath's compliance to set the next breath's pressure. A cough creates a high-pressure spike; if the pressure hits the High Pressure Limit (usually 5 cmH2O below the alarm), the vent immediately cycles to exhalation, resulting in a significantly reduced tidal volume for that breath. Frequent coughing can cause the vent to down-regulate the pressure for the next breath incorrectly, potentially leading to transient hypoventilation.
A patient with COPD is triggering high-pressure alarms. You notice the expiratory flow on the ventilator screen does not return to zero before the next breath begins. What is the management strategy?
Show answer →Increase the Expiratory Time (Te) by decreasing the respiratory rate or increasing the Inspiratory Flow rate. Rationale: This scenario describes Auto-PEEP (intrinsic PEEP) caused by air trapping. When the flow doesn't return to zero, the patient hasn't fully exhaled. This increases intrathoracic pressure, triggers high-pressure alarms, and can cause hemodynamic collapse. BCEN Strategy: Recognize the breath stacking pattern on flow-volume loops and adjust I:E ratios accordingly.
A patient in ARDS is on Volume Control. The High Pressure alarm sounds repeatedly. PIP is 55, Pplat is 50. The patient is well-sedated and paralyzed. What is the most appropriate ventilator adjustment?
Show answer →Switch to Pressure Controlled Ventilation (PCV) or decrease the Tidal Volume (Lung Protective Ventilation). Rationale: High PIP and High Pplat indicate poor lung compliance (stiff lungs). In ARDS, the goal is to keep Pplat <30 cmH2O to prevent volutrauma/barotrauma. If the patient is already paralyzed (eliminating resistance from coughing/fighting), the issue is compliance. BCEN Strategy: Prioritize Lung Protective Strategies (6 mL/kg PBW) in ARDS troubleshooting.
You are transporting a 4-year-old with status asthmaticus on BiPAP. What is a unique risk factor when using high IPAP settings in pediatric patients compared to adults?
Show answer →Increased risk of gastric insufflation and subsequent vomiting/aspiration. Children have a more horizontal diaphragm and a more compliant chest wall. High pressures (typically >15-18 cmH2O in small children) can easily overcome the lower esophageal sphincter. Strategy: BCEN focuses on the anatomical differences in peds. Consider an orogastric (OG) tube for decompression if high pressures are needed for prolonged transport.
During a long-distance fixed-wing transport of an agitated patient in four-point soft restraints, what is the minimum frequency for neurovascular assessment and documentation according to BCEN and CAMTS standards?
Show answer →Assessments must occur and be documented at least every 15 minutes. This includes neurovascular status (distal pulses, capillary refill, skin temperature, sensation), skin integrity, and the continued clinical need for restraints. Rational: Transport environments are high-risk; vibration and altitude changes can mask worsening ischemia or skin breakdown. Clinical Pearl: Continuous observation is required for any restrained patient in transport. Exam Tip: BCEN emphasizes that the q15m check is the gold standard for safety in the confined transport environment, even if hospital policy allows for longer intervals.
During the Scalpel-Bougie technique for emergency cricothyrotomy, once the horizontal incision through the cricothyroid membrane is made and the scalpel is rotated 90 degrees, what is the next critical step?
Show answer →After the 90-degree rotation (which opens the airway), the next step is to insert a bougie (gum elastic bougie) into the trachea. Clinical Reasoning: The bougie provides tactile confirmation of tracheal placement (feeling tracheal rings/clicks) and acts as a guide for the ETT. This reduces the risk of false passage or esophageal placement. Exam Tip: Avoid using a standard stylet; the bougie is the gold standard for surgical airway in transport. Ensure the scalpel stays in the incision until the bougie is placed.
A trauma patient's A-line shows ringing (multiple oscillations) after a square wave test and a falsely high systolic pressure. What is this phenomenon called and how should the transport nurse adjust the system?
Show answer →This is underdamping or overshoot (resonance). It occurs due to long tubing, small diameter catheters, or excessive patient movement. It results in falsely elevated systolic and falsely low diastolic readings. Adjustment: Use a damping device (e.g., Rosebug) or shorten the tubing length. BCEN Tip: BCEN focuses on differentiating underdamping from true hypertension. If the square wave test shows more than two oscillations before returning to baseline, the system is underdamped.
A patient with an LVAD is in cardiogenic shock. The team chooses a cold inotrope (Levosimendan) over a warm inotrope. What is the mechanism of Levosimendan (off-label/emerging) compared to traditional inotropes?
Show answer →Levosimendan is a calcium-sensitizer. It binds to troponin C in cardiac muscle, increasing the sensitivity of the heart to existing calcium without increasing intracellular calcium levels. This improves contractility without increasing myocardial oxygen consumption or the risk of calcium-induced arrhythmias. Exam Strategy: While less common in the US than Europe, BCEN may test the concept of Calcium Sensitization as an alternative to cAMP-mediated inotropy (like Dobutamine/Milrinone) in refractory heart failure.
A patient presents 2 hours after ingesting a handful of 500mg acetaminophen tablets. According to the Rumack-Matthew Nomogram, what is the earliest time a serum acetaminophen level can be drawn to accurately predict hepatotoxicity and determine the need for N-acetylcysteine (NAC)?
Show answer →The earliest time to draw a serum acetaminophen (APAP) level for use with the Rumack-Matthew Nomogram is 4 hours post-ingestion. Levels drawn before 4 hours are unreliable due to ongoing absorption and distribution. Rationale: The nomogram starts at the 4-hour mark (threshold of 150 mcg/mL in the US). If the ingestion time is unknown or >24 hours, the nomogram cannot be used, and NAC should be started empirically if any APAP is detectable or AST is elevated. CTRN Exam Tip: BCEN often tests the 4-hour rule as the definitive starting point for risk stratification in acute, single-event ingestions.
A patient with a recent penetrating eye injury and suspected intraocular air requires transport. Why is aeromedical transport a relative contraindication, and what is the priority?
Show answer →Boyle's Law. Intraocular air (even a tiny bubble) will expand during ascent. Because the eye is a non-distensible globe, this expansion causes a rapid, dangerous increase in intraocular pressure (IOP), which can lead to permanent blindness or extrusion of intraocular contents. Priority: Transport via ground if possible. If air transport is mandatory, maintain a Sea Level cabin altitude or fly at the lowest possible altitude.
Interpret the following ABG and electrolytes: pH 7.15, Na 140, Cl 105, HCO3 10. Calculate the Anion Gap (AG) and list three common transport-related causes.
Show answer →AG = 25 (Formula: Na - [Cl + HCO3]). Normal AG is 8-12. This is a High Anion Gap Metabolic Acidosis (HAGMA). Common causes in transport include: 1. Lactic Acidosis (shock, hemorrhage), 2. Ketoacidosis (DKA, starvation), 3. Renal failure (Uremia). BCEN Focus: Always calculate the AG when metabolic acidosis is present to narrow the differential diagnosis.
A transport team is stranded in a desert environment post-accident. To procure water, they decide to build a solar still. What is the primary mechanism of this device and a common pitfall to avoid?
Show answer →A solar still uses solar energy to evaporate moisture from the soil or non-poisonous vegetation, which then condenses on a plastic sheet and drips into a container. Mechanism: Greenhouse effect and condensation. Pitfall: The energy expended to dig the hole often exceeds the hydration gained from the resulting water. Clinical Pearl: In high-heat environments, water rationing is a myth; survivors should drink what they have when thirsty to maintain cognitive function, as rationing often leads to death with water still in the canteen.
17–20 correct
Strong. Move to the hardest material and timed drilling rather than re-reading topics you already know.
12–16 correct
A normal mid-prep score. Work the topics you missed one at a time — the topic pages below are built for exactly that.
Under 12 correct
Early days. Go topic by topic instead of taking more mixed tests: pick your weakest area below and drill it until the questions feel routine.
Pathology questions
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Management questions
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Procedures questions
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Pharmacology questions
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Physiology questions
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Diagnostics questions
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Try 30 free CTRN cards firstIt is 20 real question-and-answer cards from our 1050-card CTRN deck, mixed across topics so it feels like the breadth of the exam. It is not the official BCEN exam and is not endorsed by BCEN — for the official outline and any official practice material, go to BCEN directly.
Use the bands on this page as study guidance, not as a pass mark: we do not publish a passing score for the CTRN because BCEN sets it, and it can change. Confirm the current standard in the official handbook.
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