Spirometry

Question 1

What is VT?

Answer 1

Tidal volume

Air moved by a normal breath

Question 2

What is IRV?

Answer 2

Inspiratory reserve volume

Additional amount inhaled after a normal inspiration

Question 3

What is ERV?

Answer 3

Expiratory reserve volume

Amount of extra air that can be exhaled after a normal breath

Question 4

What is RV?

Answer 4

Residual volume

Amount of air left in lungs after full expiration - prevents alveolar collapse

Question 5

What is VC?

Answer 5

Vital capacity

Maximum amount of air moved by the lungs

Question 6

What is TLC?

Answer 6

Total lung capacity

Question 7

What is FRC?

Answer 7

Functional reserve volume

Volume of air in the lungs after a passive exhalation

Question 8

How do you calculate inspiratory capacity?

Answer 8

VT + IRV

Question 9

How do you calculate expiratory capacity?

Answer 9

VT + ERV

Question 10

How to calculate FRC?

Answer 10

ERV + RV

Question 11

How do you calculate total lung capacity?

Answer 11

VC + RV

Question 12

How do you calculate VC?

Answer 12

IRV + VT + ERV

Question 13

What is FVC?

Answer 13

Forced vital capacity

Maximal amount of air that the patient can forcibly remove after taking a maximal inhalation

Question 14

Wbat is FEV1?

Answer 14

Forced expiratory volume in 1 second

Volume exhaled in the first second

Question 15

What is PEF?

Answer 15

Peak expiratory flow

Maximal speed of airflow as the patient exhales

Question 16

How is FVC predicted?

Answer 16

Measured value compared to healthy people of same gender, height, age

Question 17

What is the typical pattern in obstructive disease?

Answer 17

FVC near normal
FEV1 reduced

FEV1/FVC <70%

Question 18

What is the typical pattern in restrictive disease?

Answer 18

Low FVC
Low FEV1

FEV1/FVC >/=70%