Gas Transport Flashcards
1
Q
What is the alveolar gas equation?
A
PAO2=(PB-47)*FIO2-PACO2/0.8
2
Q
Is diffusion or ventilation rate limiting in CO2 removal?
A
Ventilation, diffusion is very fast causing near perfect equilibration.
3
Q
What is the relationship between ventilation and CO2 production?
A
VA=VCO2/PACO2
4
Q
Define hypoventilation
A
Low ventilation, PACO2 increase (>45 torr)
5
Q
Define hyperventilation
A
High ventilation, PACO2 decrease (
6
Q
What causes hypoventilation?
A
Obstructive/restrictive disease, metabolic alkylosis, CNS depression.
7
Q
What causes hyperventilation?
A
Acute hypoxemia, metabolic acidosis, CNS stimulation
