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Flashcards in Lung Function Tests Deck (24)
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1

What is spirometry?

Test used to asses lung function

2

What is tidal volume?

Normal volume moved by a normal breath

3

What is the inspiratory reserve volume?

Air that can still be breathed after normal breath

4

What is the expiratory reserve volume?

The extra air that can be exhaled after a normal breath

5

What is the residual volume?

Air that always remains in lungs

6

Why is there a residual volume?

Prevent alveolar collapse

7

What is inspiratory capacity?

Tidal volume + Inspiratory reserve volume

8

What is functional residual capacity?

Expiratory reserve volume + residual volume

9

What is vital capacity?

The maximum amount of air moved by lungs

10

What is the total lung capacity?

Vital capacity + residual volume

11

What can be calculated from spirometry?

FEV1
FVC
FEV1/FVC

12

What is FEV1?

Forced expiratory volume

Forced expiration in 1st second

13

What is FVC?

Forced vital capacity

Total volume that can be forcibly exhaled in one breath

14

What is FEV1/FVC?

Ratio

Compared to normal for height, age, sex

15

What is normal FEV1?

>80%

16

What is normal FVC?

>80%

17

What is normal FEV1/FVC?

>0.7

18

What patient details do you need when taking spirometry>

Name
Age
Height
Ethnicity
Gender

19

What is the obstructive pattern on spirometry?

Reduced FEV1
Reduced FVC to a lesser extent
Reduced FEV1/FVC

20

What causes an obstructive pattern?

COPD
Asthma
Emphysema

21

How is COPD graded?

FEV1

Mild (stage 1) >80%
Moderate (stage 2) 50-79%
Severe (stage 3) 30-49%
Very severe (stage 4) <30%

22

How do you test reversibility?

Preparation
- no SABA for 6 hours
- no LABA for 12 hours

400mg then repeat after 15 mins

23

What is the restrictive pattern on spirometry?

Reduced FEV1
Reduced FVC
Normal FEV1/FVC

24

What causes a restrictive pattern?

Fibrosis
Pulmonary oedema
Skeletal abnormalities
Neuromuscular diseases