Pulmonary function testing Flashcards Preview

Year 2 Respiratory > Pulmonary function testing > Flashcards

Flashcards in Pulmonary function testing Deck (32)
1

what are the indications to perform PFTs (5)? what is the overall goal?

1. eval of patients with suspected respiratory disease
2. eval of severity of respiratory disease
3. pre op eval
4. eval of persons at risk for pulmonary disease (smokers, occupational)
5. assessment of response to therapeutic interventions

obtain baseline function

2

VC = ?

ERV + tidal volume + IRV

or, ERV + inspiratory capacity

3

inspiratory capacity = ?

tidal volume + IRV

4

ERV + tidal volume + IRV

or, ERV + inspiratory capacity

vital capacity

5

tidal volume + IRV

inspiratory capacity

6

functional residual capacity = ?

ERV + residual volume

7

ERV + residual volume = ?

functional residual capacity

8

vital capacity + residual volume = ?

total lung capacity

9

total lung capacity

vital capacity + residual volume = ?

10

what does spirometry measure?

dynamic measurement of AIR FLOW (obstruction)

11

what does body plethysmography measure?

static measurement for lung volumes (restriction)

12

what does diffusion capacity of the lungs for CO measure?

gas exhange capacity evaluation

13

can spirometry be used to measure restrictive lung diseases?

NO

14

what ratio is referenced to determine if there is an obstruction to air flow?

FEV1 / FVC

15

what value is observed when determining how severe an obstruction is?

FEV1

16

what indicates severe obstruction on PFT?

FEV1 is 50% compared to reference population

17

flow-volume pattern: obstructive

reduced peak flow, scooped-out mid-curve

18

flow-volume pattern: severe obstructive

steeple pattern, reduced peak flow, rapid fall off

19

flow-volume pattern: restrictive

normal shape, normal peak flow, reduced volume

20

reduced peak flow, scooped-out mid-curve

description of obstructive flow volume pattern

21

steeple pattern, reduced peak flow, rapid fall off

description of severe obstructive flow volume pattern

22

normal shape, normal peak flow, reduced volume

description of restrictive flow volume pattern

23

flow-time pattern: obstructive

slow rise, reduced volume expired, prolonged time to full expiration

24

flow-time pattern: restrictive

fast rise to plateau at reduced max volume

25

slow rise, reduced volume expired, prolonged time to full expiration

flow-time pattern: obstructive

26

fast rise to plateau at reduced max volume

flow-time pattern: restrictive

27

bronchoprovocation test: indication

to evaluate airway hyperrespnosiveness

28

what is a positive bronchoprovocation test?

FEV1 decreases by 20%

29

what test can measure residual volume?

body plethysmography

30

what are the normal values for total lung capacity? what indicates restriction? hyperinflation?

80-120%

restricted - less than 80%
hyperinflated - over 120%

31

what test is used to determine if there is a restrictive process present?

TLC (body plethysmography)

32

what test is used to differentiate between a parenchymal and extraparenchymal process?

DLCO