Aviation Medicine Flashcards
What are the stages of hypoxic hypoxia?
ICDC
Indifferent - 0,10000’ (98-90%)
Compensatory - 10000-15000’ (89-80%)
Disturbance - 15000-20000’ (79-70%)
Critical - 20000’+ (69-60%)
How to avoid spatial disorientation?
Never fly VMC and IMC at the same time
Never fly without visual reference points
Avoid DEATH
Trust your instruments
How to treat spatial disorientation?
Trust your instruments
Good cross-scan
Delay intuitive actions
Transfer the controls
What is the post-roll illusion?
Misperception of bank angle after a roll maneuver, you will add additional bank to recover and not the opposite
What is the graveyard spiral illusion?
(Mostly Fixed-wing) when you recover from a spin and overcorrect into another spin
What is the coriolis illusion?
Occurs whenever you have head motion during a turn, causing a tumbling sensation
What is middle ear discomfort?
Middle ear discomfort is when there is a higher pressure outside of the ear than in it during a descent
Corrected by
Stopping descent, performing valsalva
Climb until cleared, reduce rate of descent
Contact your flight surgeon
How do we treat hypoxia?
Supplemental O2
Limiting time at altitude
Pressurizing the cabin
How do we treat hypoxia?
100% O2
Descending below 10000’
How can you manage stress?
CAV-L
Change the way you think
Avoid stressors
Vent
Learn to relax
What is fatigue and the types?
Fatigue is the state of feeling tire, weary, or sleepy
Acute- 2-3 sleep periods
Chronic- inadequate recovery from succesive acute fatigue
Motivational exhaustion(burnout)-Inadequate recovery from chronic fatigue
What is the leans illusion?
The false perception of being in a turn/straight and level. Caused by rolling in and out of turns.
What is the G-Excess illusion?
When you have head movement in a turn causing you to overbank the aircraft
What is stress?
The bodies non-specific response to a demand
What are the exogenous factor restrictions and where is it found?
AR 40-8
6hrs
Centrifuge
12hrs
Alcohol
Anesthesia- local
Simulator sickness
Immunizations
24hrs
Plasma donation
Hypobaric chamber >25000’
Decompression sickness
Scuba diving
48hrs
Anesthesia- general
72hrs
blood donation>200cc
What are the types of stressors?
PEPC
Psychosocial
Environmental
physiological
Cognitive
How does the body respond to stress?
PEBC
Physical
Emotional
Behavioral
Cognitive
What is Hypoxia?
The lack of O2 in the body
Hypoxic- air
Hypemic- blood
Stagnant- circulation
Histotoxic- tissue(DEATH)
What is spatial disorientation?
A pilots erroneous perception of attitude, position, or motion in relation to earths gravitational vertical
“UNCAGED”
What is a stressor?
Any event that causes one to adjust or adapt
What is the elevator illusion?
False sense of pitch causing the eyeballs to move down, making you dive the aircraft
Parts of the vestibular system
Semicircular canals- Somatogyral (Agular)
Otolith organs- Somatogravic ( Linear)
What are the physiological (self imposed) stressors?
DEATH
Drugs
Exhaustion
Alcohol - 1oz=2000’PA
Tobacco- +5000’PA, dec 20% of night vision
Hypoglycemia
What are the types of spatial disorientation?
Type 1- Unrecognized
Type 2- Recognized
Type 3- Incapacitating
Somatogravic illusions
G-excess
Elevator
Somatogyral illusions
Leans
Coriolis
Post roll
Graveyard spin
What are the 3 systems that effect equilibrium?
Visual
Vestibular
Somatosensory
