unit 4 Flashcards
(72 cards)
what is hypoxia
first symptom
first big noticeable sign you have it
how to avoid getting it
low/not enough oxygen to your body
euphoria
losing night vision
don’t fly above 10 000 ft without supplemental oxygen
what is dysbarism
how can a fast descent be bad for someone with dysbarism
trapped gasses in the ear drum, sinus, stomach…
air pressure increases -> rupture ear drum
what is decompression
why are scuba diver susceptible to it
what happens if a scuba diver flies immediately
at higher altitudes, not a lot of oxygen molecules to space out the nitrogen in your body so all the nitrogen clumps together in blood vessels and blocks arteries/joints
divers breathe in supplemental oxygen (tissues have superstaured with oxygen rn so super spaced out nitrogen).
nitrogen bubbles form at 8000 ft = cause the bends
after non decompression dives, flights within 8000 ft ASL should be avoided for ___h
12h
after non decompression dives, flights above 8000 ft ASL should be avoided for ___h
why?
24h
in case the plane suddenly loses pressurization
use _____ vision at night. how?
peripheral
look at things off centre
at night, use a ___ flashlight because
red
red light doesn’t affect night vision (eyes don’t need to readjust)
spatial disorientation vs vertigo
spatial disorientation = confused about your position and movement
vertigo = sense of spinning or rolling when you are not
acceleration gives the illusion of
climbing
deceleration gives the illusion of
descending
banks give the illusion of
level flight
illusion caused by linear acceleration or deceleration are called “______ illusions”
somatogravic
illusion caused by turns are called “______ illusions”
vestibular
T/F: piltso can take meds for airsickness
NO FALSE becase can cause drowsiness and impaired judgement
our circadian rhythm makes us LEAST alert between the hours of ____ and _____
3-5am
3-5 pm
local anesthetic = ___ (time) before flying again
24h
big boy anesthetic = ___ (time) before flying
need to be cleared by aviation doctor
blood donation = must wait ___h before flying again because…
48h
less blood = absorb less oxygen = hypoxia at low altitude
carbon monoxide poisioning will lead to
hypoxia
how to recover from hyperventilation
slow your breathing to 10-12 breaths per minute
how does smoking and. hypoxia link
smoking = more carbon monoxide in blood = that CO bound to hemoglobin instead of O2 = lower oxygen carrying capacity of the blood = hypoxia at lower altitudes
time of useful consciousness definition
amount of time an indicidual is able to perform flying duties efficiently at a low oxygen supply
positive vs negative G forces
positive G force = blood cant get to head = stagnant hypoxia
negative G force = all blood to head = red out
hypoxic hypoxia
low oxygen in blood stream because of high altitude
