Question

When the values of Fev1=1.3 & FCV=3.9. Which of the following does this signify?

• A. Normal lung function
• B. Obstructive lung disease
• C. Restrictive lung disease
• D. Both

Answer 1

The Correct Option is B

In physiology, the assessment of lung function typically involves measurements like FEV1 (Forced Expiratory Volume in 1 second) and FVC (Forced Vital Capacity). These parameters help diagnose different types of lung diseases. To determine the condition, we calculate the FEV1/FVC ratio:

\[ \text{FEV1/FVC ratio} = \frac{\text{FEV1}}{\text{FVC}} = \frac{1.3}{3.9} \approx 0.333 \]

A normal FEV1/FVC ratio is typically above 0.7 (or 70%). In this case, the ratio is significantly lower than 0.7, suggesting a reduced ability to expel air from the lungs quickly. This decrease in the ratio is characteristic of obstructive lung diseases, where airflow is hindered. Common obstructive diseases include asthma and chronic obstructive pulmonary disease (COPD).

The calculation of the FEV1/FVC ratio confirms a diagnosis of obstructive lung disease.