Lung Volumes

Question 1

Lung volume

Answer 1

One of the the 4 primary non overlapping sub divisions of total lung capacity

Question 2

IRV

Answer 2

Air you can breathe in on top of normal breathing

Question 3

RV

Answer 3

Air in your lungs you can’t breathe out

Question 4

Four lung volumes?

Answer 4

Tv, irv, Erv, rv

Question 5

Lung capacity

Answer 5

Measurement comprised of more than one lung volume

Question 6

Four lung capacitied

Answer 6

TLC, vc, ic, frc

Question 7

Techniques for measuring residual volume?

Answer 7

Helium dilution method
Nitrogen washout method
Body box plethysmography (applies boyle’s law)

Question 8

Tv estimation in children?

Answer 8

6 to 10 mls/kg

Question 9

Erv reflects?

Answer 9

Thoracic and abdominal muscle strength

Question 10

Vital capacity?

Answer 10

Max volume of gas that can be exhaled after maximum inspiration

Question 11

Restrictive lung disease affects

Answer 11

Total lung capacity and vital capacity

Question 12

Frc

Answer 12

Volume of air remaining in lungs at the end of normal tidal expiration

Question 13

Frc =

Answer 13

Erv + rv

Question 14

What happens if frc closed to certain volume

Answer 14

Small airways begin to close

Frc functions as a reservoir to supply oxygen during apnea

Question 15

Tlc

Answer 15

Volime of air contained in the lungs at the end of maximum inspiration. Sum of all 4 lung volumes

Question 16

Closing capacity?

Answer 16

Lung volume below which small airways begin to close

Question 17

Fev1

Answer 17

Volume of air that can be expelled in the first second of maximum expiration after maximum inspiration
Fev1 is about 80% of FVC
Values lead than 70 indicate airway obstruction

Question 18

Fvc

Answer 18

Volume of air that is expelled during forced max expiration after max inspiration

When Fvc is less than lower limit, there may be restrictive pulmonary disorder

Question 19

Fef 25 to 75

Answer 19

Measures the air flow in the middle of a forced exhalation

Question 20

Flow equals?

Answer 20

Volume per time

Question 21

Obstructive lung disease and restrictive

Answer 21

Obstructive is problem with airways eg asthma

Restrictive is problem with lung itself

Question 22

LOOK AT SLIDE 110

Answer 22

..

Question 23

PEF rate

Answer 23

Maximal rate that a person can exhale during a short maximal expiratory effort after a full inspiration

Question 24

Use of spirometry in respiratory diagnostics

Answer 24

Obstructive disease(narrow airways eg copd or asthma)
Fev1/Fvc ratio reduced 

Restrictive(small lung volume). Restricted lung expandion. eg lung fibrosis, kyphoscoliosis, …
Fvc reduced. Fev1/fvc ratio normal

Mixed
Both features present

Question 25

Note

Answer 25

Pulmonary obstruction brings about involving of second part of expiratory loop
PEF reduced

Restrictive lung disease
Forced vital capacity(segment between TLC and rv reduced)

Question 26

Breath holding time greater than 25 seconds indicates which VC

Answer 26

Greater than 3.5L

Question 27

For match blowing test of snider, able to blow match represents?

Answer 27

Fev1 > 1.6l

Question 28

What is spirometry ideally used for

Answer 28

To diagnose obstructive pulmonary disorders

Flow volume curves may also diagnose intra or extra thoracic airway obstruction