Lung Function

Question 1

What two devices are most commonly used to test lung function?

Answer 1

• Peak flow meter

- Vitalograph

Question 2

How do you use a peak flow meter?

Answer 2

Very rapid exhaled “puff” from full inspiration

Question 3

What does peak flow meter measure?

Answer 3

Peak expiratory flow rate

Question 4

What are the normal value using a peak flow meter?

Answer 4

500-600 L/min

Question 5

How do you use a vitalograph?

Answer 5

-Sustained forced expiration from full inspiration

Question 6

How does the vital graph measure?

Answer 6

• Forced vital capacity (FVC)

- In first second: forced expiratory volume1

Question 7

What are the labels for the x and y axis of a vitalograph?

Answer 7

X - axis = time in seconds

Y - axis = FVC

Question 8

What can vitalograph not measure?

Answer 8

Anything that includes the RV

Question 9

Describe a vitalograph comparing a normal and obstructive (increasing resistance) graph:

Answer 9

-Same volume but obstructive takes longer to reach

Question 10

Describe a vitalograph comparing a normal and restrictive disease (decrease in compliance) graph:

Answer 10

-Lungs cannot expand normally because fo restriction