T4 L2: Measuring lung function Flashcards

1
Q

When is a spirometry result considered abnormal?

A

When its <80% of the predicted value

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2
Q

What are the 3 things that spirometry values are dependent on?

A

Gender, height, and age

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3
Q

When is a peak flow useful?

A

Only with asthma not COPD

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4
Q

What should a normal expiratory flow-volume loop look like?

A

Triangular. The expiration should be smooth and rounded and not fall dramatically

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5
Q

What does it mean when the expiratory flow-volume loop is flat and not peaked properly?

A

There is an extra-thoracic obstruction. Eg. tracheal stenosis

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6
Q

What could cause a decrease in radius of an airway?

A

Mucus, bronchoconstriction, compression from a mass

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7
Q

What 2 tests can be performed to measure lung capacity?

A

Helium dilution and plethysmography test

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8
Q

What is a tidal volume?

A

The amount of air that goes in and out with each breath

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9
Q

What is the inspiratory reserve volume?

A

The extra volume of air that can be inspired with maximal effort after reaching the end of a normal, quiet inspiration

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10
Q

What is the expiratory reserve volume?

A

The amount of extra air exhaled during a forceful breath out

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11
Q

What is the residual volume?

A

The volume of air remaining in the lungs after maximum forceful expiration

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12
Q

What is the total lung capacity?

A

The volume of air in the lungs upon the maximum effort of inspiration

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13
Q

What is the vital capacity?

A

The maximum amount of air a person can expel from their lungs after a maximum inhalation

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14
Q

What is the functional residual capacity?

A

The volume of air present in the lungs at the end of passive expiration

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15
Q

What is the inspiratory capacity?

A

The maximum volume of air that can be inspired after reaching the end of a normal, quiet expiration

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16
Q

What is the survival purpose of a residual capacity in the lungs?

A

The air is their in case of an emergency

17
Q

What remains normal with fibrotic lung disease?

A

The tidal volume. Everything else goes down

18
Q

Which disease affects the alveolar filling process?

A

Pneumonia

19
Q

What is the difference between scoliosis and kyphoscoliosis?

A

Kyphoscoliosis occurs both in the sagittal and coronal plane but scoliosis only in the coronal plane

20
Q

What is emphysema

A

Disease affecting elastic recoil

21
Q

What is meant by ‘air trapping’ and when might it occur?

A

Happens with significant emphysema. It’s when air becomes stuck in the lungs because there is a loss of elastic recoil so it can’t be pushed back out

22
Q

What 2 things affect gas exchange at the alveoli?

A

Surface area and thickness of the membranes

23
Q

What happens to the alveoli during fibrotic lung disease?

A

The alveolar membrane thickens

24
Q

What is TLco?

A

A gas transfer test. A low TLco identifies abnormal gas exchange