V/Q mismatch

Question 1

Which situations are perfusion limited?

Answer 1

O2, CO2 and N2O=>normal situations

Question 2

Which situations are diffusion limited?

Answer 2

Emphysema, fibrosis and CO

Question 3

In fibrosis what happens to the Thickness? then what happens to the Diffusion?

Answer 3

Increased

Decreased

Question 4

In Emphysema what happens to the SA? then what happens to the Diffusion?

Answer 4

Decreases

Decreases

Question 5

How do you calculate the Pulmonary vascular resistance?

Answer 5

R=∆P/Q=>(P artery-PWCP)/CO)

Question 6

Increased A-a gradient is seen in what three disease states?

Answer 6

1. V/Q mismatch
2. Diffusion limitation ƒ
3. Right-to-left shunt

Question 7

Which one does not respond to O2?

Answer 7

Right-to-left shunt

Question 8

Examples of Right-to-left shunt?

Answer 8

ARDS/Pulm. Edema

Question 9

Normal A-a gradient is seen in what 2 states?

Answer 9

1. High Altitude

2. Hypoventilation

Question 10

Give an example of Hypoventilation?

Answer 10

Opioid Use

Question 11

Normally, both ventilation and perfusion are greater at the?

Answer 11

base

Question 12

With Exercise=>V/Q reaches?

Answer 12

1

Question 13

In tracheal obstruction, V/Q is?

Answer 13

0

Question 14

In PE, V/Q is?

Answer 14

∞

Question 15

if V/Q is ∞, can it improve with O2 100%?

Answer 15

Yes