APEx Flight Physiology
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Question 1 of 28
1. Question
Dalton’s law demonstrates that the concentration of oxygen at 43,000 feet mean sea level (MSL) will be?
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Question 2 of 28
2. Question
A patient has a diagnosis of a sequestered small bowel. The flight crew knows that when the aircraft ascends to a cruising altitude of 4,000 feet mean sea level (MSL), Boyle’s law could cause what?
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Question 3 of 28
3. Question
A patient is suffering from an episode secondary to acute cardiovascular disease and is being transported via rotorcraft. The crew is currently flying at an altitude of 8,000 feet mean sea level (MSL). This patient is most susceptible to what type of hypoxia?
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Question 4 of 28
4. Question
A patient suffering from decompression sickness is an example of which gas law?
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Question 5 of 28
5. Question
According to Gay Lussac’s law, as the temperature of a gas increases, what else is expected?
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Question 6 of 28
6. Question
An expanding endotracheal (ETT) in flight is an indication of which gas law?
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Question 7 of 28
7. Question
Barodentalgia will most likely be exacerbated by ________?
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Question 8 of 28
8. Question
Barotitis media is most likely experienced during which phase of flight?
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Question 9 of 28
9. Question
Charles’s law is best defined as:
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Question 10 of 28
10. Question
Charles’s law states that as you increase the temperature of a gas, you would expect:
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Question 11 of 28
11. Question
Dalton’s law demonstrates that the concentration of O2 at 18,000 feet mean sea level (MSL) is 21%. If the atmospheric pressure at 18,000 feet MSL is 380 torr, what would the partial pressure of oxygen be at that altitude?
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Question 12 of 28
12. Question
During flight operations, at what altitude interval does the most significant change in atmospheric pressure occur?
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Question 13 of 28
13. Question
During the ascent phase of flight, a flight crew member reports a sharp pain over their sinuses. Treatment is accomplished by:
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Question 14 of 28
14. Question
During a 3-hour critical care transport in a rotor-wing aircraft, the flight crew notices that the patient’s blood sugar has decreased more than expected. The team suspects that this is likely due to which stressor of flight?
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Question 15 of 28
15. Question
For every 1,000 feet increase in altitude, the ambient temperature will _________ an average of _________ Celsius.
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Question 16 of 28
16. Question
Noise from an aircraft can adversely affect a patient and crew during critical care transport. Which of the following is an example of this limitation?
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Question 17 of 28
17. Question
The flight crew is flying at 40,000 feet mean sea level (MSL) and they experience an explosive decompression. How much time do they have to apply an O2 source before they experience unconsciousness?
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Question 18 of 28
18. Question
The flight crew is transporting patient “A” that is currently at a hospital with an elevation of 50 feet mean sea level (MSL). They will be transporting to a hospital that has an elevation of 4,080 feet MSL. Later in their shift, the flight crew transports patient “B” that is currently at a hospital with an elevation of 3,300 feet MSL. They will be transporting to a hospital that has an elevation of 2,075 feet MSL. Which patient had the most significant physiological change?
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Question 19 of 28
19. Question
The flight team is flying an intubated and mechanically ventilated patient in ARDS. The patient has been in a refractory hypoxic state for the past 12 hours, with the highest SpO2 reflecting 87%. The patient is currently on a FiO2 of 0.30. They are flying at 10,000 feet MSL, with the atmospheric pressure at that altitude being 522 mmHg. Based on Dalton’s law, what would the partial pressure of oxygen be?
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Question 20 of 28
20. Question
The flight team is transporting a cardiac patient on oxygen at 6 liters per minute by nasal cannula. They are at 5,000 feet and the patient is becoming hypoxic. What is the initial intervention for this patient?
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Question 21 of 28
21. Question
The flight team is transporting a pediatric patient in respiratory distress via fixed-wing aircraft. Their work of breathing has increased as they transition to level flight. According to Boyle’s law, what intervention might improve their respiratory status?
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Question 22 of 28
22. Question
The intra-aortic balloon pump (IABP) begins to purge during ascent. The triggering mechanism is the result of which gas law?
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Question 23 of 28
23. Question
What stressor of flight has the most significant impact on the patient during transport?
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Question 24 of 28
24. Question
When administering high concentrations of oxygen to alleviate hypoxic hypoxia, which component of which gas law is being altered?
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Question 25 of 28
25. Question
Which patient would be least affected with altitude temperature changes?
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Question 26 of 28
26. Question
Which statement best describes Henry’s law?
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Question 27 of 28
27. Question
Which tube would be most affected by altitude changes based on Boyle’s law?
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Question 28 of 28
28. Question
While flying at cruising altitudes, Boyle’s law causes difficulty in controlling the rate of IV fluid drips. What is the most appropriate action to manage this?
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