Phys 6 Respiratory mechanics

Question 1

What happens in a test where lungs are in a container and we have negative pressure in the container?

Answer 1

Question 2

explain how the plotting of the volume change in relationship to negative pressure would look like in a pressure/volume relationship

Answer 2

Question 3

At low volumes do you need higher or lower change in pressure to increase volume?

Answer 3

Question 4

At middle ranges do we need more or less pressure difference to change the volume of the lungs?

Answer 4

Question 5

At high volumes do you need higher or lower pressure change to change the volume?

Answer 5

Question 6

What is the stretchability of the lungs measured as?

what is the equation?

Answer 6

Question 7

Answer 7

Question 8

what happens to the volume/pressure relationship when we exhale?

Answer 8

Question 9

What different between air inflation and saline infation?

Answer 9

Question 10

Difference in inspiratory and expiratory lines due to what?

what is this difference called?

Answer 10

Question 11

what accounts for hysteresis in saline-filled curve?

Answer 11

Question 12

Volume vs Airway pressure graph

how would the lungs look on this graph?

without the rib cage what would the resting point be?

Answer 12

Question 13

Airway pressure/volume graph

how would the rib cage alone look like?

Answer 13

Question 14

Airway pressure/volume graph

what about the line for lungs and rib cage when combined?

Answer 14

Question 15

Airway pressure/volume graph

at what point do the lungs and rib cage exactly balance each other out?

Answer 15

Functional residual capacity

Question 16

Airway pressure/volume graph

Lungs want to be where?

why cant they get there?

Answer 16

Question 17

Airway pressure/volume graph

balance point for the rib cage

(also side note about pneumothoraxs)

Answer 17

Question 18

What is FEV?

Answer 18

Question 19

What is the amount of air that can be exhaled in the first second?

Answer 19

Question 20

what ratio is important in testing pulmonary functions?

Answer 20

FVC- forced vital capacity (how much you can get out)

Question 21

what is reduced in emphysema or asthma?

what type of diseases are these?

what happens to FEV1/FVC?

what is happening to either value?

Answer 21

Question 22

what is reduced in interstitial lung disease?

what type of disease is this?

what happens to the FEV1/FVC ratio?

Answer 22

Question 23

What does the elastic recoil of the lung want to happen?

why doesn’t this happen?

Answer 23

Elastic recoil would normally create collapse of the small airways and alveoli.

when opposing each other and not collapsing this is called interdependence

Question 24

What happens if we lose some of the walls in the lung? (interdependence)

Answer 24

COPD

Question 25

what happens if we increase airway resistance?

Answer 25

Question 26

what does the blue represent?

Answer 26

Question 27

Answer 27

Question 28

What is the checkered part?

Answer 28

Question 29

what does increasing resistance do to inspiratory loop? expiratory?

Answer 29

increase airway resistance can make the inpiratory loop bigger so inspiratory work is harder

Question 30

at what point does expiration have to be active?

Answer 30