FLIGHT NURSE PRE-HIRE EXAM 2026–2027
COMPREHENSIVE PRACTICE QUESTIONS, VERIFIED ANSWERS
SECTION 1: AEROMEDICAL PHYSIOLOGY
Question 1
A flight nurse is preparing to transport a patient with a pneumothorax who has a chest tube
in place. The aircraft will be flying at a cabin altitude of 8,000 feet. Which physiological
principle most directly explains why the flight nurse must monitor the chest tube drainage
system closely during ascent?
A. Boyle's Law dictates that gas volume increases as ambient pressure decreases
B. Dalton's Law explains the partial pressure gradient of oxygen
C. Henry's Law accounts for nitrogen bubble formation in tissues
D. Graham's Law describes the rate of gas diffusion across membranes
Correct Answer: A
Explanation: Boyle's Law states that gas volume varies inversely with pressure. As cabin
altitude increases during ascent, ambient pressure decreases, causing trapped gas
(including air in the pleural space) to expand by approximately 30%, potentially increasing
pneumothorax size and compromising ventilation.
Clinical Pearl: Always ensure chest tube drainage systems are vented to ambient
pressure. Clamped chest tubes are contraindicated during flight due to the risk of tension
pneumothorax from gas expansion.
Question 2
A 45-year-old patient with a history of chronic obstructive pulmonary disease requires air
transport at 10,000 feet cabin altitude. The flight nurse calculates the patient's alveolar
oxygen tension using the alveolar gas equation. Which of the following represents the most
significant physiological change that occurs at this altitude?
A. Increased carbon dioxide retention due to hypoxic ventilatory drive
B. Decreased alveolar oxygen tension to approximately 55 mmHg
,C. Increased hemoglobin-oxygen affinity due to right shift
D. Decreased minute ventilation due to respiratory alkalosis
Correct Answer: B
Explanation: At 10,000 feet, barometric pressure drops to about 523 mmHg, resulting in
alveolar PO₂ of approximately 55 mmHg. This represents a significant hypoxic challenge for
patients with compromised respiratory function, potentially leading to hypoxemia requiring
supplemental oxygen.
Clinical Pearl: Patients with underlying pulmonary disease should receive supplemental
oxygen during air transport, with target SpO₂ maintained above 90%. Preoxygenation before
flight is essential.
Question 3
During a fixed-wing transport at 9,000 feet cabin altitude, a flight nurse observes that a
patient's nasogastric tube is not draining properly. The patient reports increasing
abdominal discomfort. Which gas law best explains the pathophysiology of this
complication?
A. Charles' Law—gas expands when temperature increases
B. Boyle's Law—gas expands when pressure decreases
C. Dalton's Law—partial pressure of oxygen decreases
D. Henry's Law—gas dissolves in response to partial pressure
Correct Answer: B
Explanation: Boyle's Law explains that as cabin pressure decreases during ascent, gas
within the stomach and intestines expands. This expansion can cause gastric distension,
impair NG tube drainage, and contribute to abdominal discomfort, nausea, or vomiting.
Clinical Pearl: All air-containing devices, including NG tubes, Foley catheters, and
endotracheal tube cuffs, must be vented or checked frequently during flight. ET tube cuff
pressures may need adjustment during ascent and descent.
Question 4
A patient with a traumatic brain injury is being transported at a cabin altitude of 7,500 feet.
The flight nurse is concerned about cerebral edema progression. Which of the following
best describes the effect of altitude on intracranial pressure?
,A. Altitude has no effect on intracranial pressure
B. Reduced ambient pressure may worsen cerebral edema
C. Increased oxygen availability decreases intracranial pressure
D. Hypocapnia from altitude-induced hyperventilation increases ICP
Correct Answer: B
Explanation: Reduced ambient pressure at altitude can lead to expansion of intracranial
air (if present from trauma) and exacerbation of cerebral edema. Additionally, hypoxia may
cause cerebral vasodilation, further increasing intracranial pressure. Maintaining PaCO₂ in
a normocapnic range is crucial.
Clinical Pearl: For patients with TBI, target PaCO₂ should be 35-40 mmHg. Avoid
hyperventilation (PaCO₂ <30 mmHg) which can cause cerebral ischemia, and avoid
hypercapnia which increases ICP. Consider head elevation and sedation.
Question 5
A flight nurse is caring for a patient with an arterial line during transport. The patient's blood
pressure readings have been consistently lower during cruise at 8,000 feet compared to
ground-level readings. Which of the following explanations is most accurate?
A. The transducer is incorrectly zeroed
B. The pressure transducer is affected by altitude
C. The patient is experiencing hypovolemic shock
D. The transducer height relative to the patient has changed
Correct Answer: D
Explanation: Inaccurate arterial line readings during flight typically result from changes in
transducer positioning relative to the phlebostatic axis. Movement of the patient or aircraft
during turbulence can alter the transducer height, requiring re-leveling and re-zeroing to
obtain accurate pressure measurements.
Clinical Pearl: Secure arterial line transducers to the patient's chest at the phlebostatic
axis (fourth intercostal space, mid-axillary line) and re-check zeroing after significant
patient repositioning or during turbulent flight phases.
Question 6
, A 60-year-old patient with history of coronary artery disease is being transported at 8,500
feet cabin altitude. Which statement best describes the physiological response to acute
altitude exposure in this patient population?
A. Hypoxia-induced peripheral vasoconstriction increases myocardial workload
B. Increased barometric pressure improves coronary perfusion
C. Hyperventilation causes respiratory acidosis
D. Decreased sympathetic tone reduces myocardial oxygen demand
Correct Answer: A
Explanation: Acute altitude exposure induces a hypoxic ventilatory response and
subsequent sympathetic activation. Tachycardia and increased systemic vascular
resistance elevate myocardial oxygen demand, which may precipitate ischemic events in
patients with compromised coronary circulation.
Clinical Pearl: Cardiac patients transported by air should receive supplemental oxygen to
maintain SpO₂ >92%. Anti-anginal medications should be readily available, and continuous
ECG monitoring is essential during transport.
Question 7
During the descent phase of a helicopter transport, a patient with a history of eustachian
tube dysfunction complains of severe ear pain. The flight nurse recognizes this as
barotrauma. Which gas law explains why the pain is typically more severe during descent
than ascent?
A. Boyle's Law—pressure changes are more rapid during descent
B. Dalton's Law—gaseous diffusion is slower during descent
C. Charles' Law—temperature changes affect middle ear pressure
D. Henry's Law—nitrogen absorption increases during descent
Correct Answer: A
Explanation: During descent, ambient pressure increases, causing the gas in the middle
ear to contract. If the eustachian tube fails to equalize pressure, a relative negative
pressure develops in the middle ear, leading to pain, tympanic membrane retraction, and
potential rupture. This pressure differential is often more difficult to equalize than during
ascent.
COMPREHENSIVE PRACTICE QUESTIONS, VERIFIED ANSWERS
SECTION 1: AEROMEDICAL PHYSIOLOGY
Question 1
A flight nurse is preparing to transport a patient with a pneumothorax who has a chest tube
in place. The aircraft will be flying at a cabin altitude of 8,000 feet. Which physiological
principle most directly explains why the flight nurse must monitor the chest tube drainage
system closely during ascent?
A. Boyle's Law dictates that gas volume increases as ambient pressure decreases
B. Dalton's Law explains the partial pressure gradient of oxygen
C. Henry's Law accounts for nitrogen bubble formation in tissues
D. Graham's Law describes the rate of gas diffusion across membranes
Correct Answer: A
Explanation: Boyle's Law states that gas volume varies inversely with pressure. As cabin
altitude increases during ascent, ambient pressure decreases, causing trapped gas
(including air in the pleural space) to expand by approximately 30%, potentially increasing
pneumothorax size and compromising ventilation.
Clinical Pearl: Always ensure chest tube drainage systems are vented to ambient
pressure. Clamped chest tubes are contraindicated during flight due to the risk of tension
pneumothorax from gas expansion.
Question 2
A 45-year-old patient with a history of chronic obstructive pulmonary disease requires air
transport at 10,000 feet cabin altitude. The flight nurse calculates the patient's alveolar
oxygen tension using the alveolar gas equation. Which of the following represents the most
significant physiological change that occurs at this altitude?
A. Increased carbon dioxide retention due to hypoxic ventilatory drive
B. Decreased alveolar oxygen tension to approximately 55 mmHg
,C. Increased hemoglobin-oxygen affinity due to right shift
D. Decreased minute ventilation due to respiratory alkalosis
Correct Answer: B
Explanation: At 10,000 feet, barometric pressure drops to about 523 mmHg, resulting in
alveolar PO₂ of approximately 55 mmHg. This represents a significant hypoxic challenge for
patients with compromised respiratory function, potentially leading to hypoxemia requiring
supplemental oxygen.
Clinical Pearl: Patients with underlying pulmonary disease should receive supplemental
oxygen during air transport, with target SpO₂ maintained above 90%. Preoxygenation before
flight is essential.
Question 3
During a fixed-wing transport at 9,000 feet cabin altitude, a flight nurse observes that a
patient's nasogastric tube is not draining properly. The patient reports increasing
abdominal discomfort. Which gas law best explains the pathophysiology of this
complication?
A. Charles' Law—gas expands when temperature increases
B. Boyle's Law—gas expands when pressure decreases
C. Dalton's Law—partial pressure of oxygen decreases
D. Henry's Law—gas dissolves in response to partial pressure
Correct Answer: B
Explanation: Boyle's Law explains that as cabin pressure decreases during ascent, gas
within the stomach and intestines expands. This expansion can cause gastric distension,
impair NG tube drainage, and contribute to abdominal discomfort, nausea, or vomiting.
Clinical Pearl: All air-containing devices, including NG tubes, Foley catheters, and
endotracheal tube cuffs, must be vented or checked frequently during flight. ET tube cuff
pressures may need adjustment during ascent and descent.
Question 4
A patient with a traumatic brain injury is being transported at a cabin altitude of 7,500 feet.
The flight nurse is concerned about cerebral edema progression. Which of the following
best describes the effect of altitude on intracranial pressure?
,A. Altitude has no effect on intracranial pressure
B. Reduced ambient pressure may worsen cerebral edema
C. Increased oxygen availability decreases intracranial pressure
D. Hypocapnia from altitude-induced hyperventilation increases ICP
Correct Answer: B
Explanation: Reduced ambient pressure at altitude can lead to expansion of intracranial
air (if present from trauma) and exacerbation of cerebral edema. Additionally, hypoxia may
cause cerebral vasodilation, further increasing intracranial pressure. Maintaining PaCO₂ in
a normocapnic range is crucial.
Clinical Pearl: For patients with TBI, target PaCO₂ should be 35-40 mmHg. Avoid
hyperventilation (PaCO₂ <30 mmHg) which can cause cerebral ischemia, and avoid
hypercapnia which increases ICP. Consider head elevation and sedation.
Question 5
A flight nurse is caring for a patient with an arterial line during transport. The patient's blood
pressure readings have been consistently lower during cruise at 8,000 feet compared to
ground-level readings. Which of the following explanations is most accurate?
A. The transducer is incorrectly zeroed
B. The pressure transducer is affected by altitude
C. The patient is experiencing hypovolemic shock
D. The transducer height relative to the patient has changed
Correct Answer: D
Explanation: Inaccurate arterial line readings during flight typically result from changes in
transducer positioning relative to the phlebostatic axis. Movement of the patient or aircraft
during turbulence can alter the transducer height, requiring re-leveling and re-zeroing to
obtain accurate pressure measurements.
Clinical Pearl: Secure arterial line transducers to the patient's chest at the phlebostatic
axis (fourth intercostal space, mid-axillary line) and re-check zeroing after significant
patient repositioning or during turbulent flight phases.
Question 6
, A 60-year-old patient with history of coronary artery disease is being transported at 8,500
feet cabin altitude. Which statement best describes the physiological response to acute
altitude exposure in this patient population?
A. Hypoxia-induced peripheral vasoconstriction increases myocardial workload
B. Increased barometric pressure improves coronary perfusion
C. Hyperventilation causes respiratory acidosis
D. Decreased sympathetic tone reduces myocardial oxygen demand
Correct Answer: A
Explanation: Acute altitude exposure induces a hypoxic ventilatory response and
subsequent sympathetic activation. Tachycardia and increased systemic vascular
resistance elevate myocardial oxygen demand, which may precipitate ischemic events in
patients with compromised coronary circulation.
Clinical Pearl: Cardiac patients transported by air should receive supplemental oxygen to
maintain SpO₂ >92%. Anti-anginal medications should be readily available, and continuous
ECG monitoring is essential during transport.
Question 7
During the descent phase of a helicopter transport, a patient with a history of eustachian
tube dysfunction complains of severe ear pain. The flight nurse recognizes this as
barotrauma. Which gas law explains why the pain is typically more severe during descent
than ascent?
A. Boyle's Law—pressure changes are more rapid during descent
B. Dalton's Law—gaseous diffusion is slower during descent
C. Charles' Law—temperature changes affect middle ear pressure
D. Henry's Law—nitrogen absorption increases during descent
Correct Answer: A
Explanation: During descent, ambient pressure increases, causing the gas in the middle
ear to contract. If the eustachian tube fails to equalize pressure, a relative negative
pressure develops in the middle ear, leading to pain, tympanic membrane retraction, and
potential rupture. This pressure differential is often more difficult to equalize than during
ascent.
