DSA: Pulmonary Functions Test

Question 1

T/F: Presence of a heart disease like CHF causes confusing Pulmonary Function Test results

Answer 1

True

Question 2

Which of the following correctly refers to an obstructive disease?

A. Increase in FEV1/FVC ratio

B. air has a problem moving through the lungs, and the lungs have low compliance

C. air has a problem moving through the lungs, and lungs have highest compliance

D. All of the above

Answer 2

C. air has a problem moving through the lungs, and lungs have highest compliance

Question 3

Which of the following lowers Diffusion capacity of the lungs?

A. Anemia

B. Emphysema

C. Pulmonary Embolism

D. Pulmonary Fibrosis

E. All of the above

F. None of the above

Answer 3

All of the above

• anemia: affects ability to accept and bind gas
• emphysema; pulmonary embolism: decrease surface area of alveolar-capillary unit
• pulmonary fibrosis: alters membrane permeability (increased thickness gases must travel)

Question 4

State the direction of the following values one would assume in an obstructive disease?

FEV/FVC

FVC

TLC

FEV

Answer 4

FEV/FVC: Decrease

FVC: Decrease/Normal

TLC: Normal/Increase

FEV: Decrease

Question 5

Which of the following values can be used to determine severity of an obstructive disease?

A. FEV1/FVC

B. FEV1

C. TLC

D. FVC

Answer 5

FEV1

Question 6

A significant bronchodilator response requires spirometry readings indicating either FEV1 or FVC increasing by what value from the pre-bronchodilator values?

Answer 6

12% or 200mL

Question 7

When the FEV/FVC ratio is decreased you can assume obstructive disease. However, we must look at a few more variables to distinguish between three possibilities: pure obstruction, air trapping, or mixed pattern. Which of the following would indicate air trapping?

A. Normal FVC with a decreased TLC

B. Decreased FVC with a normal or elevated TLC

C. Decreased FVC with a decreased TLC

D. None of the above

Answer 7

B. Decreased FVC with a normal or elevated TLC

Question 8

When the FEV/FVC ratio is decreased you can assume obstructive disease. However, we must look at a few more variables to distinguish between three possibilities: pure obstruction, air trapping, or mixed pattern. Which of the following would indicate mixed pattern?

A. Normal FVC with a decreased TLC

B. Decreased FVC with a normal or elevated TLC

C. Decreased FVC with a decreased TLC

D. None of the above

Answer 8

Decreased FVC with a decreased TLC

Question 9

When the FEV/FVC ratio is decreased you can assume obstructive disease. However, we must look at a few more variables to distinguish between three possibilities: pure obstruction, air trapping, or mixed pattern. Which of the following would indicate pure obstruction?

A. Normal FVC with a decreased TLC

B. Decreased FVC with a normal or elevated TLC

C. Decreased FVC with a decreased TLC

D. None of the above

Answer 9

None of the above

NOTE: pure obstruction would have a normal FVC

Question 10

When trying to distinguish between a parenchymal vs. extraparenchymal cause of restirction we look at Diffusion Capacity. Which of the following results would indicate a parenchymal cause of restriction?

A. Low DL(CO)

B. High DL(CO)

C. Normal DL(CO)

D. None of the above

Answer 10

Low DL(CO)

NOte: extraparnchymal would have a normal DL(CO)

Question 11

What are the 3 most important measures to understand lung function?

Answer 11

FEV/FVC

FEV1

FVC

Question 12

T/F: Air trapping would have no effect on Residual Volume

Answer 12

False; air trapping increases residual volume, and that’s why TLC might seem normal or elevated even if FVC is low

Question 13

T/F: TLC is needed to confirm presence of restrictive disease

Answer 13

True