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Flashcards in Pulmonary Function Tests Deck (23):
1

IRV

-Inspiratory reserve volume
-amount of air that can be taken in over and beyond normal TV

2

RV

-residual volume
-vol of air remaining in lungs after forceful exhalation

3

Reserve Volumes based on balance between:

-lung/chest wall elasticity
-respiratory muscle strength
-chest wall mobility

4

ERV

-expiratory reserve volume
-amount of air that can be expired by forceful expiration after end of normal TV exhale

5

4 Lung volumes

-Tidal volume
-Inspiratory reserve volume
-expiratory reserve volume
-residual volume

6

TV

-tidal volume
-volume inspired or expired with each breath

(10-20% FVC)

7

4 Lung Capacities

-(combo of volumes)
-Inspiratory Capacity
-Functional Residual Capacity
-Vital Capacity
-Total Lung Capacity

8

TLC

-total lung capacity
=RV + ERV + TV + IRV
-max vol to which lungs can be expanded

9

FRC

-functional residual capacity
=ERV + RV
-amount of air in lungs after normal exhale

10

VC

-vital capacity
=ERV + TV + IRV

11

IC

-inspiratory capacity
=IRV + TV
-max amount of air that can be taken in after normal exhale

12

Maximal Voluntary Ventilation

-max air take in in one minute
-breathing rapidly and deep for 15 sec X4

Males: 140-180 L/min
Female: 80-120 L/min

13

Exercise Effect on Lung Volume and Capacity

-first increase TV then RR

-Slight decr in TLC & VC because increased blood causes decreased lung space
-increased RV some

14

Minute ventilation

-amount of air inhaled or exhaled in 1 min
=TV x RR
-at rest=500ml/breath x 12 breaths/min (6L/min)

15

5 Flow rates

-minute ventilation
-maximal voluntary ventilation
-forced vital capacity
-FEV1 & FEV3
-FEV%

16

FEV%

ratio between FEV & FVC

-FEV1/FVC=72%
-FEV3/FVC=92%

17

VO2 Summary Guideline

-should be able to perform work at 40% of VO2 max for 8 hours

18

Cough Effectiveness

-inspiratory phase >/= 60% predicted VC
-FVC >/=60% predicted
-FEV1 >/=60% (good muscle strength)
-FEV1/FVC >/=60% (for good cough)
-PEFR >/=4L/sec

19

FEV1
(FEV3)

amount of air that can be forcefully exhaled in 1 or 3 seconds following a max inhale

20

FVC

-max amount of air out following max inhale

-FVC should = VC

21

Obstructive Disease on PFT

-Incr TLC
-incr FRC
-incr RV

-decr timed capacity

22

Restrictive Disease on PFT

-decr TLC
-normal/decr FRC
-normal/incr timed capacities
-decr VC (<80% predicted)

23

Guidelines for ability to ex's

-aerobic if FEV >/=50% predicted

if <50% do intervals