Pulmonary Mechanics Flashcards Preview

► Med Misc 44 > Pulmonary Mechanics > Flashcards

Flashcards in Pulmonary Mechanics Deck (19)
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1
Q

Intrapleural and Intrapulmonary mechanics:

the intrapleural space is a potential space found where?

A

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

2
Q

Intrapleural and Intrapulmonary mechanics:

Is the intrapleural pressure positive or negative?

A

negative (subatmospheric)

3
Q

Intrapleural and Intrapulmonary mechanics:

why is the intrapleural pressure negative?

A

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

4
Q

Intrapleural and Intrapulmonary mechanics:

the inward and outward pressures of the intrapleural space are equal when

A

at FRC

5
Q

Intrapleural and Intrapulmonary mechanics:

how much pleural fluid is around each lung?

A

10-20 mL

6
Q

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

A

More negative (sub atmospheric)

7
Q

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

A

b/c the intrapulmonary pressures are less than atmospheric pressure

8
Q

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

A

More negative

9
Q

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

A

Less negative

10
Q

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

A

less neg (actually become Positive) above atmospheric pressure

11
Q

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

A

b/c intraPULMONARY pressures exceeds atmospheric pressure

12
Q

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

A

at end-expiration

13
Q

Pulmonary Mechanics: Must knows

what couples the lungs to the chest wall

A

Pleural membranes

14
Q

Pulmonary Mechanics: Must knows

IntraPLEURAL pressure is always ______ during normal tidal breathing

A

NEGATIVE (subatmospheric0

15
Q

Pulmonary Mechanics: Must knows

IntraPLEURAL pressure becomes _____ negative during inspiration

A

MORE negative

16
Q

Pulmonary Mechanics: Must knows

IntraPLEURAL pressure become _____ negative during expiration.

A

LESS negative (but is always in a negative state)

17
Q

Pulmonary Mechanics: Must knows

intraPULMONARY pressure is _____ during inspiration

A

NEGATIVE

18
Q

Pulmonary Mechanics: Must knows

Intrapulmonary pressure is ______ during exhalation

A

POSITIVE

19
Q

Pulmonary Mechanics: Must knows

when is the only 2 times intraPLEURAL pressure can become positive?

A

forced expiration

expiratory effort against closed glottis (valsalva)

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