Lecture 10: Ventilation- Perfusion Relationships

Question 1

Hypoxemia

Answer 1

low blood oxygen which induces minute ventialtion

Question 2

Hypoxia hypoxemia

Answer 2

due to decreased PO2

Question 3

Alveolar hypoventilation

Answer 3

decrease ventilation doesn’t provide sufficient refreshing of alveolar gas to maintain PAO2

Question 4

Causes of alveolar hypventialtion

Answer 4

obstruction of airway
paralysis of respiratory muscles
decreased respiratory drive from CNS

Question 5

Treat hypo ventilation with?

Answer 5

PIO2 and increase ventialtion

Question 6

Diffusion limitation

Answer 6

increasing difficulty fr oxygen to diffuse from alveoli to blood b thickening of diffusion barrier

Question 7

Shunt

Answer 7

flow of blood from right atria to L, heart bypassing gas exchange are or blood flowing past unventilated regions
venous blood mixing with blood returning from the lungs

Question 8

Does PIO2 have any effect on shunt?

Answer 8

NO

Question 9

Narrowing of one airway and i normal airway

Answer 9

ventilation will decrease on restricted side- causing some gas exchange to occur but not enough
increased ventilation doesn’t work

Question 10

Alveoulus

Answer 10

Po2 drives Co2

Question 11

Blood

Answer 11

CO2 drives PO2