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Flashcards in PFTs Deck (15):
1

What the effort dependant tests?

FEV's / flow rates- spirometry

2

What are the effort independent tests?

Relaxed vital capacity

Helium/N2 washout static lung volumes

Whole body plethysmography

Impulse oximetry

Exhaled breath nitric oxide

3

What are the gas diffusion tests?

CO transfer factor
ABGs
SaO2 during exercise

4

Describe PFTs in asthma

FVC preserved
FEV1 reduced

5

Describe PFTs in COPD

FVC reduced
FEV1 reduced

6

What causes a volume dependant flow-volume curve

Asthma
Chronic bronchitis

7

What causes a pressure dependant flow-volume curve

Emphysema

8

Describe bronchial challenge testing

Exercise
Methacholine/histamine/mannitol
-marker of airway hyperresponsiveness
-concentration to produce 20% reduction FEV1
Allergens/chemicals
-early and late responses
-diagnosis of occupational asthma

9

What is the use of of a CPET

Differentiate cardiac and respiratory dyspnoea

10

What PFT is affected in interstitial lung disease

SaO2 during exercise

11

What is seen in asthma exercise testing?

reduced FEV1 or PEF

12

What causes decreased TLCO

anaemia, emphysema, interstitial lung disease, pulmonary oedema, Po emboli, bronchiectasis

13

How is airway resistance measured?

Whole body plethysmography or more commonly/easily with impulse oximetry

14

What does IOS measure? When is IOS used?

Airway resistance during quiet tidal breathing.
in kids

15

What is FeNO?

Exhaled breath condensate.
non invasive marker of eosinophilic airway inflammation in asthma

adjunct to bronchial challenge to assess asthmatic inflammation –especially when spirometry is normal