Air Methods Critical Care Actual Exam
2026/2027 | Verified Questions
Air Methods / Global Medical Response | Verified Q&A |
Professional Flight Nurses and Critical Care Paramedic
Candidates
This document contains 100 original questions developed to reinforce the official competency objectives of critical
care transport practice. The questions address Aeromedical Physiology and the Flight Environment, Advanced
Airway and Respiratory Management, Critical Care Pharmacology and Hemodynamic Interventions, and Trauma
and Medical Emergencies in Transport. Content is designed to support clinical proficiency and actual exam
readiness for Professional Flight Nurses and Critical Care Paramedic Candidates. All material is original and
aligned with current critical care transport guidelines, FP-C/CFRN review materials, and evidence-based
aeromedical care standards for the 2026/2027 cycle.
Domain: Aeromedical Physiology and the Flight Environment
1. According to Boyle’s law, as altitude increases and ambient pressure decreases, the volume of a
trapped gas in a closed space will:
A. Decrease proportionally
B. Increase proportionally
C. Remain unchanged
D. Convert to a liquid state
Correct Answer: B
Rationale: Boyle’s law states that at constant temperature the volume of a gas is inversely proportional to the absolute
pressure; therefore gas expands as barometric pressure falls with altitude.
2. Which gas law explains why the partial pressure of oxygen decreases with increasing altitude
even though the percentage of oxygen in the atmosphere remains constant?
A. Boyle’s law
B. Dalton’s law of partial pressures
C. Charles’s law
D. Henry’s law
Correct Answer: D
Rationale: Dalton’s law states that the total pressure of a gas mixture equals the sum of the partial pressures of its
components; as total atmospheric pressure falls, the partial pressure of oxygen falls proportionally.
3. Henry’s law is most relevant to which aeromedical concern?
A. Expansion of a pneumothorax
B. The amount of nitrogen dissolved in body tissues and the risk of decompression sickness
C. The rate of diffusion of oxygen across the alveolar membrane only
D. Changes in cabin temperature with altitude
Correct Answer: B
Rationale: Henry’s law describes the solubility of gases in liquids; rapid decreases in pressure can cause dissolved nitrogen to
come out of solution and form bubbles.
4. A patient with a closed pneumothorax is being transported at altitude. The most important
preventive action is:
A. Allowing the pneumothorax to expand freely
B. Ensuring a functioning chest tube is in place and open to atmosphere or an appropriate drainage system
before ascent
Air Methods Critical Care Actual Exam 2026/2027 | Verified Questions
, C. Administering 100% oxygen only after landing
D. Increasing cabin altitude to reduce gas volume
Correct Answer: C
Rationale: Trapped air expands according to Boyle’s law; a patent chest tube prevents tension physiology during ascent.
5. The primary physiologic effect of decreased partial pressure of oxygen at altitude is:
A. Hyperoxia and oxygen toxicity
B. Hypobaric hypoxia leading to reduced arterial oxygen tension
C. Increased nitrogen partial pressure
D. Immediate improvement in tissue oxygenation
Correct Answer: D
Rationale: Lower barometric pressure reduces the partial pressure of inspired oxygen, producing hypobaric hypoxia.
6. Which stage of hypoxia is characterized by impaired judgment, drowsiness, and difficulty
performing complex tasks, typically occurring at altitudes of approximately 10,000–15,000 feet in
unacclimatized individuals?
A. Indifferent stage
B. Compensatory stage
C. Disturbance stage
D. Critical stage
Correct Answer: C
Rationale: In the disturbance stage, higher cortical functions begin to fail and performance deteriorates markedly.
7. The most effective immediate treatment for suspected altitude-related hypoxia in a transport
patient is:
A. Increasing the fraction of inspired oxygen and, if necessary, descending to a lower cabin altitude
B. Administering a diuretic
C. Encouraging rapid breathing of ambient air only
D. Applying a tourniquet to an extremity
Correct Answer: C
Rationale: Supplemental oxygen raises the alveolar partial pressure of oxygen; descent increases ambient pressure and
further improves oxygenation.
8. Charles’s law is most applicable to which aspect of aeromedical transport?
A. The relationship between temperature and volume of a gas at constant pressure, relevant to gas expansion in
heated or cooled environments
B. The partial pressures of gases in a mixture
C. The solubility of gases in blood
D. The diffusion rate of oxygen across membranes
Correct Answer: C
Rationale: Charles’s law states that gas volume is directly proportional to absolute temperature at constant pressure.
9. A patient with a bowel obstruction is at increased risk during air transport primarily because of:
A. Boyle’s law–related expansion of intestinal gas
B. Dalton’s law effects on oxygen
C. Henry’s law and nitrogen bubbles
D. Charles’s law and temperature changes only
Correct Answer: A
Rationale: Gas within the bowel expands as ambient pressure falls, potentially worsening distention, pain, and risk of
perforation.
10. The time of useful consciousness at 25,000 feet in an unpressurized environment after rapid
decompression is approximately:
A. More than 30 minutes
B. 3–5 minutes
C. Less than 30 seconds in many individuals
D. Unaffected by altitude
Correct Answer: D
Rationale: At 25,000 feet the time of useful consciousness is typically on the order of a few minutes, depending on activity level
and individual factors.
Air Methods Critical Care Actual Exam 2026/2027 | Verified Questions
, 11. Which of the following best describes the physiologic effect of positive-pressure ventilation at
altitude?
A. It has no effect on gas exchange
B. It can help overcome the reduced partial pressure of oxygen by increasing alveolar pressure and oxygen
delivery
C. It always causes barotrauma at any altitude
D. It decreases the need for supplemental oxygen
Correct Answer: C
Rationale: Positive-pressure ventilation can improve oxygenation by increasing mean airway pressure and alveolar
recruitment, partially compensating for lower ambient oxygen tension.
12. A patient with a recent SCUBA dive is at risk for decompression sickness during flight primarily
because of:
A. Boyle’s law expansion of trapped air only
B. Henry’s law and the release of dissolved nitrogen as ambient pressure decreases
C. Charles’s law temperature effects
D. Dalton’s law changes in oxygen percentage
Correct Answer: D
Rationale: Nitrogen that dissolved under pressure during the dive can form bubbles when ambient pressure falls during
ascent in the aircraft.
13. The primary purpose of aircraft cabin pressurization is to:
A. Maintain a cabin altitude that keeps the partial pressure of oxygen within physiologically tolerable limits
B. Eliminate the need for any supplemental oxygen under all conditions
C. Increase the percentage of oxygen in the cabin air
D. Prevent all effects of Boyle’s law
Correct Answer: B
Rationale: Cabin pressurization keeps the effective altitude (and therefore oxygen partial pressure) within a range that most
healthy individuals can tolerate.
14. Which of the following is a compensatory physiologic response to hypobaric hypoxia?
A. Hyperventilation, tachycardia, and increased cardiac output
B. Bradycardia and decreased respiratory rate
C. Vasodilation of all vascular beds without exception
D. Immediate cessation of aerobic metabolism
Correct Answer: A
Rationale: The body attempts to maintain oxygen delivery by increasing minute ventilation and cardiac output.
15. A patient with a middle-ear barotrauma during descent is most likely experiencing difficulty
equalizing pressure because of:
A. A blocked Eustachian tube preventing air from entering the middle ear as ambient pressure rises
B. Excessive air entering the middle ear
C. A change in the percentage of oxygen only
D. Nitrogen bubble formation in the middle ear
Correct Answer: D
Rationale: On descent ambient pressure increases; if the Eustachian tube cannot open, a relative vacuum forms in the middle
ear, causing pain and possible injury.
16. Which of the following patients is at highest risk for complications related to gas expansion
during ascent?
A. A patient with a patent chest tube and no residual pneumothorax
B. A patient with an untreated pneumothorax or inadequately decompressed hollow viscus
C. A patient breathing 100% oxygen at sea level
D. A patient with chronic anemia only
Correct Answer: C
Rationale: Any closed gas space will expand; an untreated pneumothorax or obstructed bowel is particularly dangerous.
17. The alveolar gas equation demonstrates that alveolar PO₂ is determined primarily by:
A. Barometric pressure, inspired oxygen fraction, and arterial PCO₂
B. Only the percentage of oxygen in the atmosphere
Air Methods Critical Care Actual Exam 2026/2027 | Verified Questions
2026/2027 | Verified Questions
Air Methods / Global Medical Response | Verified Q&A |
Professional Flight Nurses and Critical Care Paramedic
Candidates
This document contains 100 original questions developed to reinforce the official competency objectives of critical
care transport practice. The questions address Aeromedical Physiology and the Flight Environment, Advanced
Airway and Respiratory Management, Critical Care Pharmacology and Hemodynamic Interventions, and Trauma
and Medical Emergencies in Transport. Content is designed to support clinical proficiency and actual exam
readiness for Professional Flight Nurses and Critical Care Paramedic Candidates. All material is original and
aligned with current critical care transport guidelines, FP-C/CFRN review materials, and evidence-based
aeromedical care standards for the 2026/2027 cycle.
Domain: Aeromedical Physiology and the Flight Environment
1. According to Boyle’s law, as altitude increases and ambient pressure decreases, the volume of a
trapped gas in a closed space will:
A. Decrease proportionally
B. Increase proportionally
C. Remain unchanged
D. Convert to a liquid state
Correct Answer: B
Rationale: Boyle’s law states that at constant temperature the volume of a gas is inversely proportional to the absolute
pressure; therefore gas expands as barometric pressure falls with altitude.
2. Which gas law explains why the partial pressure of oxygen decreases with increasing altitude
even though the percentage of oxygen in the atmosphere remains constant?
A. Boyle’s law
B. Dalton’s law of partial pressures
C. Charles’s law
D. Henry’s law
Correct Answer: D
Rationale: Dalton’s law states that the total pressure of a gas mixture equals the sum of the partial pressures of its
components; as total atmospheric pressure falls, the partial pressure of oxygen falls proportionally.
3. Henry’s law is most relevant to which aeromedical concern?
A. Expansion of a pneumothorax
B. The amount of nitrogen dissolved in body tissues and the risk of decompression sickness
C. The rate of diffusion of oxygen across the alveolar membrane only
D. Changes in cabin temperature with altitude
Correct Answer: B
Rationale: Henry’s law describes the solubility of gases in liquids; rapid decreases in pressure can cause dissolved nitrogen to
come out of solution and form bubbles.
4. A patient with a closed pneumothorax is being transported at altitude. The most important
preventive action is:
A. Allowing the pneumothorax to expand freely
B. Ensuring a functioning chest tube is in place and open to atmosphere or an appropriate drainage system
before ascent
Air Methods Critical Care Actual Exam 2026/2027 | Verified Questions
, C. Administering 100% oxygen only after landing
D. Increasing cabin altitude to reduce gas volume
Correct Answer: C
Rationale: Trapped air expands according to Boyle’s law; a patent chest tube prevents tension physiology during ascent.
5. The primary physiologic effect of decreased partial pressure of oxygen at altitude is:
A. Hyperoxia and oxygen toxicity
B. Hypobaric hypoxia leading to reduced arterial oxygen tension
C. Increased nitrogen partial pressure
D. Immediate improvement in tissue oxygenation
Correct Answer: D
Rationale: Lower barometric pressure reduces the partial pressure of inspired oxygen, producing hypobaric hypoxia.
6. Which stage of hypoxia is characterized by impaired judgment, drowsiness, and difficulty
performing complex tasks, typically occurring at altitudes of approximately 10,000–15,000 feet in
unacclimatized individuals?
A. Indifferent stage
B. Compensatory stage
C. Disturbance stage
D. Critical stage
Correct Answer: C
Rationale: In the disturbance stage, higher cortical functions begin to fail and performance deteriorates markedly.
7. The most effective immediate treatment for suspected altitude-related hypoxia in a transport
patient is:
A. Increasing the fraction of inspired oxygen and, if necessary, descending to a lower cabin altitude
B. Administering a diuretic
C. Encouraging rapid breathing of ambient air only
D. Applying a tourniquet to an extremity
Correct Answer: C
Rationale: Supplemental oxygen raises the alveolar partial pressure of oxygen; descent increases ambient pressure and
further improves oxygenation.
8. Charles’s law is most applicable to which aspect of aeromedical transport?
A. The relationship between temperature and volume of a gas at constant pressure, relevant to gas expansion in
heated or cooled environments
B. The partial pressures of gases in a mixture
C. The solubility of gases in blood
D. The diffusion rate of oxygen across membranes
Correct Answer: C
Rationale: Charles’s law states that gas volume is directly proportional to absolute temperature at constant pressure.
9. A patient with a bowel obstruction is at increased risk during air transport primarily because of:
A. Boyle’s law–related expansion of intestinal gas
B. Dalton’s law effects on oxygen
C. Henry’s law and nitrogen bubbles
D. Charles’s law and temperature changes only
Correct Answer: A
Rationale: Gas within the bowel expands as ambient pressure falls, potentially worsening distention, pain, and risk of
perforation.
10. The time of useful consciousness at 25,000 feet in an unpressurized environment after rapid
decompression is approximately:
A. More than 30 minutes
B. 3–5 minutes
C. Less than 30 seconds in many individuals
D. Unaffected by altitude
Correct Answer: D
Rationale: At 25,000 feet the time of useful consciousness is typically on the order of a few minutes, depending on activity level
and individual factors.
Air Methods Critical Care Actual Exam 2026/2027 | Verified Questions
, 11. Which of the following best describes the physiologic effect of positive-pressure ventilation at
altitude?
A. It has no effect on gas exchange
B. It can help overcome the reduced partial pressure of oxygen by increasing alveolar pressure and oxygen
delivery
C. It always causes barotrauma at any altitude
D. It decreases the need for supplemental oxygen
Correct Answer: C
Rationale: Positive-pressure ventilation can improve oxygenation by increasing mean airway pressure and alveolar
recruitment, partially compensating for lower ambient oxygen tension.
12. A patient with a recent SCUBA dive is at risk for decompression sickness during flight primarily
because of:
A. Boyle’s law expansion of trapped air only
B. Henry’s law and the release of dissolved nitrogen as ambient pressure decreases
C. Charles’s law temperature effects
D. Dalton’s law changes in oxygen percentage
Correct Answer: D
Rationale: Nitrogen that dissolved under pressure during the dive can form bubbles when ambient pressure falls during
ascent in the aircraft.
13. The primary purpose of aircraft cabin pressurization is to:
A. Maintain a cabin altitude that keeps the partial pressure of oxygen within physiologically tolerable limits
B. Eliminate the need for any supplemental oxygen under all conditions
C. Increase the percentage of oxygen in the cabin air
D. Prevent all effects of Boyle’s law
Correct Answer: B
Rationale: Cabin pressurization keeps the effective altitude (and therefore oxygen partial pressure) within a range that most
healthy individuals can tolerate.
14. Which of the following is a compensatory physiologic response to hypobaric hypoxia?
A. Hyperventilation, tachycardia, and increased cardiac output
B. Bradycardia and decreased respiratory rate
C. Vasodilation of all vascular beds without exception
D. Immediate cessation of aerobic metabolism
Correct Answer: A
Rationale: The body attempts to maintain oxygen delivery by increasing minute ventilation and cardiac output.
15. A patient with a middle-ear barotrauma during descent is most likely experiencing difficulty
equalizing pressure because of:
A. A blocked Eustachian tube preventing air from entering the middle ear as ambient pressure rises
B. Excessive air entering the middle ear
C. A change in the percentage of oxygen only
D. Nitrogen bubble formation in the middle ear
Correct Answer: D
Rationale: On descent ambient pressure increases; if the Eustachian tube cannot open, a relative vacuum forms in the middle
ear, causing pain and possible injury.
16. Which of the following patients is at highest risk for complications related to gas expansion
during ascent?
A. A patient with a patent chest tube and no residual pneumothorax
B. A patient with an untreated pneumothorax or inadequately decompressed hollow viscus
C. A patient breathing 100% oxygen at sea level
D. A patient with chronic anemia only
Correct Answer: C
Rationale: Any closed gas space will expand; an untreated pneumothorax or obstructed bowel is particularly dangerous.
17. The alveolar gas equation demonstrates that alveolar PO₂ is determined primarily by:
A. Barometric pressure, inspired oxygen fraction, and arterial PCO₂
B. Only the percentage of oxygen in the atmosphere
Air Methods Critical Care Actual Exam 2026/2027 | Verified Questions
