Altitude Physiology Flashcards
Who created the first altitude chamber
Paul Bert
What are come common signs of hypoxia that are subjective
Air hunger, apprehension, fatigue, nausea, dizziness, vision issues, hot and cold flashes, numbness, tinging, denial
Signs of hypoxia that are visual
Hyperventilation, confusion, poor judgement, unconsciousness, slouching
What army regulation speaks of unpressurized aircraft and oxygen use
AR 95-1 para 8-6
On flights above 10,000 ft for more then how long will you need oxygen
One hour
On flight for longer then 30 min at how many feet will you need oxygen
12000
On flights at 14000 feet when do you need to have oxygen
At all times
For flights over 18000 ft what are the protocols
Pretreatment with oxygen for no less then 30 min then oxygen through the whole flight
What are the four stages of hypoxia
Indifferent, compensatory, disturbance, critical
When does the indifferent stage of hypoxia normally start and look like
SPO2 Saturation 98-90% Decreased night vision @ 4000 feet Loss of acuity Loss of color perception Altitudes Sea level - 10,000
When does the compensatory stage of hypoxia start and look like
Altitudes 10,000-15,00 SPO2 89-80% Imparted efficiency drowsiness, poor judgment decreased coordination
Disturbance stage
Altitude 15000-20000 Spo2 79-70% Memory issues, impaired judgments, poor judgment, drunk, blurred vision, slurred speech, bad handwriting
Critical stage
Altitudes 20000 ft up 69-60 spo2 Loss of consciousness, convulsions, death brain cell death
What are some factors that effect hypoxia
Altitude, ascent rate, temperature, activity level, physical fitness, self imposed stressors
At 43K+ feet what is your time for useful consciousness
9-12 seconds
40k feet what is the time of useful consciousness
15-20
35 k feet what is the useful time of consciousness
30-60 seconds
