Resp under stress

Question 1

At what altitude do unacclimatized person start to experience symptoms of hypoxia?

Answer 1

12,000 ft

Question 2

What changes occur in the body to acclimatize to low PO2?

Answer 2

Increase in ventilation
Increase in RBCs
Increased diffusing capacity of lung
Increased vascularity of peripheral tissues
Increased ability of tissues to use O2

Question 3

What two events can occur in acute mountain sickness?

Answer 3

Acute cerebral edema
Acute pulmonary edema

Question 4

What is seen in chronic mountain sickness?

Answer 4

Very high RBC mass and hematocrit
Pulmonary A pressure is elevated above normal seen during acclimatization
R side of heart is greatly enlarged
MAP begins to fall
CHF
Eventually death

Question 5

What are physiological stresses associated with diving?

Answer 5

Nitrogen narcosis
Oxygen toxicity - cerebral and pulmonary
CO2 toxicity
Decompression sickness

Question 6

What are the symptoms of decompression sickness?

Answer 6

Pain in joints and muscles
CNS symptoms
Pulmonary edema
SOB