Ventilation and Perfusion

What is the ventilation-perfusion ratio in an adult? Choose all that apply

1. 4 to 5

2. 0.60

3. 0.8

4. 20 to 1

• all of the above

• 1 and 3

• 1 and 2

• 3 and 4

• 1 and 4

Which of the following would create an increased V/Q ratio?

1. increased ventilation

2. decreased ventilation

3. increased perfusion

4. decreased perfusion

• 1 and 4

• 2 and 3

• 1 and 3

• 2 and 4

Which of the following changes would cause the V/Q ratio to decrease?

1. increased ventilation

2. decreased ventilation

3. increased perfusion

4. decreased perfusion

• 1 and 4

• 2 and 3

• 1 and 3

• 2 and 4

The V/Q ratio progressively ____________ as we move toward the lung bases

• increases

• decreases

• widens

• narrows

If I wanted to maximize the V/Q ratio in the base of the lung, how should I position my patient?

• upright

• prone

• upside down

• lying on their left side

If I wanted to maximize the V/Q ratio in the left lung because of a pathology or issue in the right lung, how should I position my patient?

• lying on their right side

• prone

• upside down

• lying on their left side

• supine

When the V/Q ratio is decreased, which of the following changes will occur:

1. PAO2 increases

2. PAO2 decreases

3. PACO2 increases

4. PACO2 decreases

5. pH increases

6. pH decreases

• 1, 3 and 5

• 1, 4, and 5

• 2, 3, and 6

• 2, 4, and 6

If a patient has an increased V/Q ratio, which of the following will occur:

1. PAO2 increases

2. PAO2 decreases

3. PACO2 increases

4. PACO2 decreases

5. pH increases

6. pH decreases

• 1, 3 and 5

• 1, 4, and 5

• 2, 3, and 6

• 2, 4, and 6

If a patient has been in a traumatic accident where a great deal of blood was lost, what would you expect to see in relation to the ventilation-perfusion ratio?

• decreased perfusion

• increased perfusion

If a patient has been in a traumatic accident where a great deal of blood was lost, which of the following would you expect to INCREASE?

1. V/Q ratio

2. PAO2

3. PACO2

4. pH

• 1, 2, and 4

• 3 only

• 1, 3, and 4

• 2 and 4