Stages of Hypoxia

Question 1

Indiffrent Stage

Answer 1

0 - 10,000ft

Loss of night vission as low as 5,000ft.

Question 2

Compensatory Stage

Answer 2

10,000 - 15,000
Physiological compensations provide some defense against hypoxia

May be some increase in depth of RR and rate, HR and CO

Question 3

Disturbance Stage

Answer 3

15,000 - 20,000

In this stage the physiological compensations do not provide adequate oxygen for the tissues.

may include fatigue, exhaustion, drowsiness, dizziness, headache, breathlessness, and euphoria.

Question 4

Critical Stage

Answer 4

> 20,000

In the critical stage consciousness is lost. Death follows shortly.

Question 5

Time of useful consciousness 20,000ft

Answer 5

30 MIN

Question 6

Time of useful consciousness 25,000ft

Answer 6

3 - 5 MIN

Question 7

Time of useful consciousness 35,000ft

Answer 7

< 1 MIN

Question 8

Time of useful consciousness 45,000ft

Answer 8

10 - 15 SEC

Question 9

Combat Hypoxia

Answer 9

Suplamental oxygen and rapid desent below 10,000ft

Question 10

what factors put you at risk for hypoxia

Answer 10

(D.E.A.T.H) Drugs, Alcohol, Exhaustion, Tabaco, Hypoglycemia.

Question 11

14 CFR 135.89

Answer 11

Unpressurized aircraft flying at 10,000 - 12,000 for more then 30 min crew must be on oxygen

Above 12,000 must use oxygen.