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Clin Med III > 5B: Lung Volumes > Flashcards

5B: Lung Volumes Flashcards

1
Q

What is the resting level for TLC?

A

The point of expiration at rest

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2
Q

What is resting expiration?

A

Normally 40% of TLC

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3
Q

What is IRV?

A

Inspiratory reserve volume - additional inspiration volume after tidal volume inspiration

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4
Q

What is the value of IRV?

A

50% of TLC

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5
Q

What is ERV?

A

Expiratory reserve volume - additional expiration volume after tidal volume expiration

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6
Q

What is the value of ERV?

A

15% TLC

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7
Q

What is RV?

A

Residual volume - air that cannot be expelled from lungs

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8
Q

What is the value of RV?

A

25% TLC

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9
Q

What is IC?

A

Inspiratory capacity - amount of air that can be inspired after tidal volume expiration

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10
Q

What is the value of IC?

A

60% TLC

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11
Q

What is VC?

A

Vital capacity - maximum amount of air that can be moved in and out of the lungs

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12
Q

What is the value of VC?

A

3500-4500 ml

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13
Q

What is TLC?

A

Total lung capacity - sum of VC + residual volume

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14
Q

What is the value of TLC?

A

5-6 L

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15
Q

What is TV?

A

Tidal volume - air moved during breathing at rest

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16
Q

What is the value of TV?

A

350-400 ml

17
Q

What is minute ventilation?

A

TV x RR

18
Q

What is FEV1?

A

Functional expiratory volume for 1 second - amount of air as a % of VC that can be expired in 1 second

19
Q

What is the value of VEF1?

A

75-80%

20
Q

What is VD?

A

Anatomical dead space: aid that must move through the conducting respiratory zone with each breath

21
Q

What is the value of VD?

A

150 ml

22
Q

What happens to residual volume with OLD?

A

Increases

23
Q

What will eventually erode the functional lung volumes?

A

Loss of lung tissue recoil and increased compliance

24
Q

What are the first effects seen in lung volume changes with OLD?

A

Decreases in FEV1, <75% is considered OLD

25
Q

What energy changes happen with OLD?

A

Increased energy usage because energy is also required to exhale

26
Q

What does increased energy demands in OLD lead to?

A

Hypertrophy of accessory muscles as pt attempts to normalize their lung volumes

27
Q

What happens to lung volumes with restrictive disorders?

A

Decreases in all lung volumes, increased work load trying to expand the lungs

Clin Med III (18 decks)

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