Pulmonary Mechanics Flashcards Preview

► Med Misc 44 > Pulmonary Mechanics > Flashcards

Flashcards in Pulmonary Mechanics Deck (19)
1

Intrapleural and Intrapulmonary mechanics:
the intrapleural space is a potential space found where?

b/t the parietal pleura of chest wall and the visceral pleura covering the lung

2

Intrapleural and Intrapulmonary mechanics:
Is the intrapleural pressure positive or negative?

negative (subatmospheric)

3

Intrapleural and Intrapulmonary mechanics:
why is the intrapleural pressure negative?

b/c the lungs recoil inward and the chest wall recoils outward

4

Intrapleural and Intrapulmonary mechanics:
the inward and outward pressures of the intrapleural space are equal when

at FRC

5

Intrapleural and Intrapulmonary mechanics:
how much pleural fluid is around each lung?

10-20 mL

6

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
During inspiration does the intrapleural pressure become more negative or positive?

More negative (sub atmospheric)

7

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
why does air enter the lung?

b/c the intrapulmonary pressures are less than atmospheric pressure

8

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
Does IntraPULMONARY pressure (which was at 0 at end expiration) become more negative or less negative at the start of inspiration

More negative

9

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
During expiration does intraPLEURAL pressure become more or less negative

Less negative

10

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
during expiration does intraPULMONARY pressures become more neg or less neg

less neg (actually become Positive) above atmospheric pressure

11

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
why is air exhaled?

b/c intraPULMONARY pressures exceeds atmospheric pressure

12

Changes in Intrapleural and intrapulmonary Pressures during normal tidal breathing:
when does intraPULMONARY pressures return to 0

at end-expiration

13

Pulmonary Mechanics: Must knows
what couples the lungs to the chest wall

Pleural membranes

14

Pulmonary Mechanics: Must knows
IntraPLEURAL pressure is always ______ during normal tidal breathing

NEGATIVE (subatmospheric0

15

Pulmonary Mechanics: Must knows
IntraPLEURAL pressure becomes _____ negative during inspiration

MORE negative

16

Pulmonary Mechanics: Must knows
IntraPLEURAL pressure become _____ negative during expiration.

LESS negative (but is always in a negative state)

17

Pulmonary Mechanics: Must knows
intraPULMONARY pressure is _____ during inspiration

NEGATIVE

18

Pulmonary Mechanics: Must knows
Intrapulmonary pressure is ______ during exhalation

POSITIVE

19

Pulmonary Mechanics: Must knows
when is the only 2 times intraPLEURAL pressure can become positive?

forced expiration
expiratory effort against closed glottis (valsalva)

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