Alveolar Compliance Curve Flashcards Preview

Apex 1 - 2 Respiratory II: Physiology (24) > Alveolar Compliance Curve > Flashcards

Flashcards in Alveolar Compliance Curve Deck (46)
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1

A patient is in the sitting position. When compared to the apex of the lung, which of the following are higher in the base? (Select 2.)

Study on!!!

2

In the textbook patient, ventilation is ---- L/min

and perfusion is ----- L/min.

Ventilation: 4 L/min

Perfusion: 5 L/min

3

In the textbook patient, ventilation is 4 L/min and perfusion is 5 L/min. This yields an overall V/ Q ratio of:

V/ Q ratio: 0.8

4

Ventilation is a function of alveolar ----- and its ----- on the alveolar compliance curve

Size

&

Position

 

5

Ventilation is a function of alveolar size and its position on the alveolar compliance curve. Another way to  think  about this is the  greater the alveolar ----- change during the respiratory cycle, the greater the amount of alveolar ventilation

Volume change

6

The Best-ventilated alveoli are the most compliant

True

7

The best-ventilated alveoli are the most compliant. What size are these alveoli?

A. Smaller

B. Larger

Smaller

8

The best-ventilated alveoli are the most compliant. Where do these smaller alveoli reside on the alveolar compliance curve?

Steep slope

(note the taller height of the red arrow near the bottom of the curve)

9

Which alveoli are the least compliant?

A.  Poorest-ventilated alveoli

B. Best-ventilated alveoli

Poorest-ventilated alveoli

10

The poorest ventilated alveoli are the least compliant. What size are these alveoli?

A. Smaller

B. Larger

Larger

11

The poorest ventilated alveoli are the least compliant. Where do these larger alveoli reside on the alveolar compliance curve?

A. Flat portion

B. Steep portion

Flat portion

(note the shorter height of the red arrow near the top of the curve).

12

What's the equation of alveolar compliance?

Compliance =

Change in volume / Change in pressure

13

Why is prefusion the greatest at the lung base?

Gravity

14

Why is ventilation the greatest at the lung base?

Higher Alveolar compliance

15

Understand that the alveolar compliance curve represents a ----- lung

Normal lung

(at or above a normal  FRC)

16

Understand that the alveolar compliance curve represents a normal lung, that it a lung at or above a normal  FRC. At a lung volume below FRC (a low lung volume), compliance will be -----.

 

"Less"

17

Which forces affect the distribution of blood flow to the lung?

Gravity

&

Hydrostatic pressure

18

When standing upright, there is less blood flow towards which region of the lung?

Apex

19

When standing upright, there is more blood flow towards which region of the lung?

Base

20

When standing upright, there is less blood flow towards the apex of the lung, and there is more blood flow towards the base. This explains why there are ----- V/Q ratios towards the apex

Higher V/Q ratios

21

When standing upright, there is less blood flow towards the apex of the lung, and there is more blood flow towards the base. This explains why there are higher V/Q ratios towards the apex and ----- V/ Q ratios towards the base

 

Lower V/ Q ratios

22

When standing upright, there is less blood flow towards the apex of the lung, and there is more blood flow towards the base. This explains why there are Higher V/Q ratios towards the apex and Lower V/ Q ratios towards the base

An easy way to remember this is to think of a tall person holding a slinky. There is more air between the rings towards the top, and this represents higher V/Q areas. There is less air in-between the spaces towards the bottom, and this represents low V/ Q areas.​

Thanks for the tip!

23

Consequences of the V/Q Relationship in Different Lung Regions: Now that we understand the importance of alveolar ventilation and perfusion, you need to know how this relationship is different in different lung regions. Now let's describe the relative V/ Q relationships between the non-dependent and dependent lung regions

Let's do it!!!!

24

Lung regions with Good V/ Q matching show ----- between alveolar and blood gas tensions. This is because gas can easily transfer from the alveolus to the blood and vice versa

 

Similarity

 

25

Lung regions with poor V/ Q matching show a -----  between alveolar and blood gas tensions. This is because gas can't transfer from the alveolus to the blood and vice versa

Larger difference

26

Alveolar Ventilation is ----- in the Non- Dependent lung region

 Low

 

27

Perfusion is ----- in the Non-Dependent lung region

Low

28

V/Q is ----- in the Non-Dependent lung region

High

29

PAO2 is ----- in the Non-Dependent lung region

High

30

PACO2 is ----- in the Non-Dependent lung region

Low