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Flashcards in Pulmonary Function Tests Deck (15):
1

Is maximal effort flow greater at a greater lung volume or lower lung volume?

-greater lung volume
-airways are distended, resistance to flow is less

2

What is responsible for the plateau on the IVPF curves?

Dynamic compression

3

Is peak flow effort dependent or effort independent? (can it vary based on the patient's effort)

Peak flow is effort dependent
- If a patient doesn't blow as much air as they can, their peak flow won't measure as high as it truly is

4

Is Mid-expiratory flow effort dependent or effort independent?

Independent of effort

5

In a volume vs Pressure plot, what is the slope?

Compliance

6

In a pressure vs flow plot what is the slope?

resistance

7

What are you trying to measure in a flow vs volume plot?

maximal effort flow volume

8

In a flow volume loop, what is the distance across the x-axis of the loop called?

Vital capacity

9

In a MEFV loop, what would be indicated if the exipiratory curve is concave downwards?

obstructive disease
-due to elevated compliance at low mid-expiratory flows
-trouble exhaling
-emphysema, bronchitis

10

A normal person should expire what percent of their vital capacity in one second? What is the shorthand for this measurement?

80%

FEV1

11

In a MEFV loop, what would a decreased vital capacity indicate?

A restrictive disease
-trouble inhaling
-fibrosis

12

A pediatric patient would have a decreased what in compared to adult patient?

A smaller vital capacity

13

In a patient with respiratory muscle disease, how would MEFV be changed?

-vital capacity is normal
-peak flow is depressed

14

What is occurring to each of these values in an obstructive disease such as asthma?
1. FEV1
2. FVC
3. FEV1/FVC
4. FRC

1. FEV1 - decreases (alot)
2. FVC - decreases
3. FEV1/FVC - decreases
4. FRC - increases (can't expire all the air)

15

What is occurring to each of these values in an restrictive disease such as fibrosis?
1. FEV1
2. FVC
3. FEV1/FVC
4. FRC

1. FEV1 - decreases
2. FVC - decreases (alot)
3. FEV1/FVC - increases or is normal
(FVC decreases more substantially than FEV1)
4. FRC - decreases