8. Lung and chest wall Flashcards Preview

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Flashcards in 8. Lung and chest wall Deck (20):
1

elastic recoil is

tendency for lungs to collapse inward and chest wall to spring outward

2

Lung and chest wall at FRC

inward pull of lung is balanced by outward pull of chest wall, and system pressure is atmospheric

3

system pressure at FRC

atmospheric

4

airway an alveolar pressure in FRC

0

5

intrapleural pressure in FRC

negative

6

pulmonary vascular pressure at FRC

minimum

7

compliance ( definition and equation, it describes )

change in lung volume for a give change in pressure expressed as ΔV/ΔP and is inversely proportional to wall stiffness
it describes the distensibility of the lung and chest wall

8

Lung and chest wall - decreased compliance situation

1. pulmonary fibrosis
2. pneumonia
3. pulmonary edema

9

increased compliance situation

1. emphysema
2. normal age

10

purpose of negative intrapleural pressure during FRC

prevent pneumothorax

11

pulmonary vascular pressure is minimmum at

FRC

12

Lung compliance is incersely proportional to

wall stiffness

13

high vs low compliance according to filling

high --> easy to fill
low --> hard to fill

14

substance that increases compliance

surfactant

15

Lung hysteresis ?

lung inflation ( inspiration ) curve follows a differnt curve than the lung deflation ( expiration) curve due to need to overcome surfae tension forces in inglation

16

lung hysteresis curve at high expanding pressures

compliance is lowest, the lungs are least distensible and curve flattens

17

lungs hysteresis curve at middle range pressues

compliance's greatest and the lungs are most distensible

18

compliance is the slope of the

pressure - volume curve ( V/P)

19

compliance - lung vs chest wall vs both as a system

the compliance of the system is less than lungs alone or chest wall alonw ( SLOPE FLATTER)

20

lung - inrapleural space during

pneumothorax