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Flashcards in Hypoxia Deck (10):
1

Which of the following statements is TRUE regarding time of useful consciousness?

A. The pilot can increase it by keeping warm and sitting still.
B. The pilot could possibly decrease it by being too warm and keeping still.
C. It refers to the amount of time a person has before they lose the ability to make rational decisions.
D. It lasts only about 2 to 3 minutes at 35,000 ft.

C. It refers to the amount of time a person has before they lose the ability to make rational decisions

2

Which of the following are NOT symptoms of hypoxia? Select all that apply:

A. tingling in the extremities.
B. flaccid muscles.
C. numbness.
D. headache.
E. rigid muscles.
F. dysphoria.

E. rigid muscles
F. dysphoria

3

How long will a pilot maintain useful consciousness if he or she experiences an explosive decompression at 30,000 ft and does not put on an oxygen mask?

A. 1-3 minutes.
B. 15-20 seconds.
C. 30-60 seconds.
D. 3-6 minutes.

A. 1-3 minutes

4

What happens to a person’s vision who is suffering from hypoxia?

A. hypoxia notably affects the rods, the cells responsible for the peripheral and night vision, resulting in tunnel vision.
B. hypoxia will affect a person’s colour vision, resulting in grey out, where they only see in black and white.
C. hypoxia notably affects the cones, the cells responsible for peripheral and night vision, resulting in tunnel vision.
D. hypoxia will affect a person’s colour vision, resulting in rich colour and contrasts, which will have an adverse affect on vision.

A. hypoxia notably affects the rods, the cells responsible for the peripheral and night vision, resulting in tunnel vision

5

Why is hypoxia dangerous?

A. It decreases circulation, making movement more difficult.
B. It causes nitrogen bubbles to form.
C. The victim may not realise that he or she is suffering from it and may lose consciousness quickly.
D. It leads to hyperventilation.

C. The victim may not realise that he or she is suffering from it and may lose consciousness quickly

6

Which of the following statements about hypoxia is TRUE?

A. It is very obvious and easy to diagnose.
B. It is caused by breathing too much oxygen.
C. It affects everyone in the same way.
D. It causes hyperventilation, memory loss, and loss of colour vision.
E. None of the above.

E. None of the above

7

How long will a pilot maintain useful consciousness if he or she experiences an explosive decompression at 40,000 ft and does not put on an oxygen mask?

A. 30 - 60 seconds.
B. 1 - 3 minutes.
C. 6 - 9 seconds.
D. 15 - 20 seconds.

D. 15 - 20 seconds

8

What is histotoxic hypoxia and what are possible causes of it?

A. insufficient oxygen reaches the body’s cells, commonly caused by alcohol, drugs and poisons.
B. insufficient oxygen reaches the body’s cells, this is commonly caused by physiological problems.
C. sufficient oxygen reaches the body’s cells, but the cells are unable to properly utilise the available oxygen, common causes include alcohol and drugs.
D. sufficient oxygen reaches the body’s cells, but the cells are unable to properly utilise the available oxygen, common causes include physiological and environmental conditions.

C. sufficient oxygen reaches the body’s cells, but the cells are unable to properly utilise the available oxygen, common causes include alcohol and drugs

9

What is ischaemic hypoxia and what are possible causes?

A. this is due to high blood pressure, usually associated with physical or environmental conditions.
B. this is due to increase in blood flow, where the body’s cells are saturated with oxygen, usually a result of environmental conditions.
C. this is due to lack of blood flow, usually a result of physiological or environmental conditions.
D. sufficient oxygen reaches the body’s cells, but the cells are unable to properly utilise the available oxygen, commonly caused by changes in the bloods haemoglobin.

C. this is due to lack of blood flow, usually a result of physiological or environmental conditions

10

A patient suffering from hypoxia may briefly experience a worsening of symptoms after oxygen is administered. The reason for this is

A. the amount of available oxygen molecules are used up by less haemoglobin than normal.
B. oxygen toxicity.
C. haemophilia.
D. oxygen paradox.

D. oxygen paradox