Physiology: spirometry

Question 1

what is the FVC

Answer 1

Forced Vital Capacity = maximum volume that can be forcefully expelled from the lungs following maximal inspiration

Question 2

what is the FEV1

Answer 2

Forced Expiration Volume in 1 sec = volume of air that can be expired in first second of an FVC determination

Question 3

what is the FEV1/FVC ratio

Answer 3

the proportion of the FVC that can be expired in the first second

Question 4

what is a normal FEV1/FVC ratio

Answer 4

(FEV1/FVC) x 100% > 70% is normal

Question 5

describe the dynamic lung volumes seen in airway obstruction

Answer 5

FVC = low/normal
FEV1 = low
FEV1/FVC = low

Question 6

describe the dynamic lung volumes seen in lung restriction

Answer 6

FVC = low
FEV1 = low
FEV1/FVC = normal

Question 7

describe dynamic lung volumes of a combination of obstruction and restriction

Answer 7

FVC = low
FEV1 = low
FEV1/FVC = low

Question 8

whats the difference between the dynamic lung volumes of an obstructive or restrictive condition

Answer 8

The FEV1/FVC ratio
obstructive = low
restrictive = normal