RRT RRT Pulmonary Function Testing

Question 1

Which spirometric pattern is characterized by reduced FVC with a normal or elevated FEV1/FVC ratio?

Accepted Answer

Restrictive pattern

Answer

A restrictive pattern shows proportional reduction in FVC and FEV1, maintaining or elevating the FEV1/FVC ratio above normal (≥0.70).

Question 2

What FEV1/FVC ratio defines airflow obstruction in spirometry?

Accepted Answer

Less than 0.70

Answer

The GOLD criteria define airflow obstruction as a post-bronchodilator FEV1/FVC ratio below 0.70, indicating COPD.

Question 3

Diffusing capacity for carbon monoxide (DLCO) is reduced in which condition?

Accepted Answer

Emphysema

Answer

Emphysema destroys alveolar walls and capillaries, reducing the surface area available for gas exchange and lowering DLCO.

Question 4

What is residual volume (RV) and how is it measured?

Accepted Answer

Volume remaining after maximal expiration; measured by body plethysmography or gas dilution

Answer

Residual volume is the air remaining in the lungs after maximal exhalation; it cannot be measured by spirometry alone, requiring body plethysmography or gas dilution techniques.

Question 5

A patient with asthma shows significant improvement in FEV1 after bronchodilator administration. What percentage increase is considered significant?

Accepted Answer

12% and 200 mL

Answer

A post-bronchodilator increase of ≥12% and ≥200 mL in FEV1 is considered a significant positive bronchodilator response, suggesting reversible obstruction.

RRT Exam Practice Test

RRT Exam Practice Test

RRT RRT Pulmonary Function Testing