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Irm > L13: Principles Of Spirometry > Flashcards

L13: Principles Of Spirometry Flashcards

1
Q

What is spirometry

A

Quantitative diagnostic test

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2
Q

What are the 2 ways of directly measuring

A

Piston spirometer

Water bell spirometer

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3
Q

What are the ways of indirect measurement

A

Peak expiratory flow

Pneumotachograph

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4
Q

What are the 3 variable that we can measure

A

Flow
Volume
Time

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5
Q

What tool measures the flow vs time

A

Peak expiratory flowmeter

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6
Q

What can peak flow be used for

A

Diurnal asthma to plot it into a diary

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7
Q

What is the peak flow biased to

A

The upper airways

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8
Q

What is peak flow dependent upon

A

Airway diameter
Tissue recoil
Effort

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9
Q

Which tool measures volume vs time

A

Spirometry

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10
Q

What is residual volume

A

The volume of air left in the lungs after a forced expiration

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11
Q

Which method measures residual volume

A

Helium dilution

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12
Q

What does a restrictive lung disease show with volume

A

Reduced lung volume

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13
Q

What does an obstructive lung disease do to airway resistance

A

Increase airway resistance

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14
Q

Examples of restrictive lung disease

A

Fibrosis

Pulmonary oedema

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15
Q

What would a restrictive lung disease show on a spirometry

A

Low vital capacity

Normal FEV1

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16
Q

What are the examples of obstructive lung disease

A

Asthma

Bronchitis

17
Q

What does an obstructive lung disease show on a spirometry

A

Normal vital capacity

Low FEV1

18
Q

What is FEV1

A

Forced expiration volume in 1st second (rate)

19
Q

What is a normal FEV1

A

Greater than 80%

20
Q

In an obstructive lung disease what would be the FEV1

A

Less than 80%

21
Q

What would an obstructive lung disease show on a peak expiratory flow rate graph show

A

Reduced peak flow and descending limb

22
Q

What would a restrictive lung disease show on a peak expiratory flow rate graph show

A

Reduced peak flow and area under the curve

23
Q

Name a condition which is a restrictive and obstructive lung disease

A

COPD

24
Q

How can COPD be classed as restrictive

A

Early stage of COPD has loss of alveolar elastic structure and therefore loss of diffusive area

25
Q

How can COPD be classes as an obstructive lung disease

A

Inflammation in small airways gives increases resistance

Irm (21 decks)

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