Pulmonary Function Tests

Question 1

IRV

Answer 1

• Inspiratory reserve volume

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

Question 2

RV

Answer 2

• residual volume

- vol of air remaining in lungs after forceful exhalation

Question 3

Reserve Volumes based on balance between:

Answer 3

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

Question 4

ERV

Answer 4

• expiratory reserve volume

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

Question 5

4 Lung volumes

Answer 5

• Tidal volume
• Inspiratory reserve volume
• expiratory reserve volume
• residual volume

Question 6

TV

Answer 6

• tidal volume
• volume inspired or expired with each breath

(10-20% FVC)

Question 7

4 Lung Capacities

Answer 7

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

Question 8

TLC

Answer 8

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

Question 9

FRC

Answer 9

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

Question 10

VC

Answer 10

-vital capacity

=ERV + TV + IRV

Question 11

IC

Answer 11

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

Question 12

Maximal Voluntary Ventilation

Answer 12

• 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

Question 13

Exercise Effect on Lung Volume and Capacity

Answer 13

-first increase TV then RR

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

Question 14

Minute ventilation

Answer 14

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

Question 15

5 Flow rates

Answer 15

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

Question 16

FEV%

Answer 16

ratio between FEV & FVC

• FEV1/FVC=72%
• FEV3/FVC=92%

Question 17

VO2 Summary Guideline

Answer 17

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

Question 18

Cough Effectiveness

Answer 18

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

Question 19

FEV1

FEV3

Answer 19

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

Question 20

FVC

Answer 20

• max amount of air out following max inhale

- FVC should = VC

Question 21

Obstructive Disease on PFT

Answer 21

• Incr TLC
• incr FRC
• incr RV

-decr timed capacity

Question 22

Restrictive Disease on PFT

Answer 22

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

Question 23

Guidelines for ability to ex’s

Answer 23

-aerobic if FEV >/=50% predicted

if <50% do intervals