Hypoxia Flashcards
(25 cards)
State the four types of decompression illness.
Bends, creeps, chokes, staggers
State the Immediate action for Hypoxia
Regulator On, 100% Oxygen, Emergency Pressure, Check Connections, Descend below 10 000 feet, Declare emergency and land when safe
Which body cavities may have trapped gas problems during ascent?
Teeth, Gastrointestinal Tract, Lungs
What gases make up the atmosphere?
78% Nitrogen, 21% Oxygen, 1% Other
WRT the atmosphere lost the three physiological zones.
Physiological (0-10 000), Physiologically Deficient (10 000-50 000), Space Equivalent (50 000+)
Define the law of gaseous diffusion
A gas will move from a high pressure container to a lower pressure until equilibrium is reached
Where do the greatest atmospheric pressure changes occur?
Below 5000 feet
At what altitude is 100% Oxygen first required to maintain MSL oxygen levels?
33 700 feet
What is the relationship between pressure and volume?
P ¤ 1/V or P1V1 =P2V2
What happens to the relative percentage of oxygen in the atmosphere as altitude increases?
It stays 21% until 300 000 feet
What parts of the upper respiratory tract may cause problems during aviation?
Frontal Sinus, Sphenoid Sinus, Ears
What happens to Carbon Dioxide levels in your blood when you over breathe (hyperventilate)
The carbon dioxide levels decrease in the blood
What is the primary purpose of red blood cells?
To carry oxygen around the body
How is deoxygenated blood returned to the heart?
Through veins. Veins have valves, use lower pressure from the diaphragm moving up and down and from muscular movement
What is the time of useful consciousness at 25 000 feet?
3-5 minutes
Why is the treatment of hypoxia and hyperventilation the same?
They show similar symptoms and as hypoxia is the most dangerous it is treated
What is the definition of hypoxia?
A low saturation of oxygen in the blood that causes impairment of functions
What are the four types of hypoxia?
Hypoxic, Hypaemic, Stagnant, Histotoxic
What is Hypoxic Hypoxia?
A lack of oxygen diffused to the blood from the lungs
What is Hypaemic Hypoxia?
Reduction of oxygen in the blood
What is Stagnant Hypoxia?
Reduction of blood in tissues. Can be caused by G
What is Histotoxic Hypoxia?
Tissue poisoning meaning cells cannot utilise oxygen
What is oxygen paradox?
A worsening of symptoms after coming onto oxygen
How is night vision affected by hypoxia?
It is deteriorated significantly
