Common pulmonary function abnormalities in individuals with moderate restrictive lung disease include: A)Normal FEV₁,normal expiratory flow rates,and normal RV/TLC ratio. B)Increased FEV₁,increased expiratory flow rates,and increased RV/TLC ratio. C)Decreased FEV₁,decreased expiratory flow rates,and increased RV/TLC ratio. D)Decreased FEV₁,decreased expiratory flow rates,and decreased RV/TLC ratio. E)Decreased FEV₁,normal expiratory flow rates,and increased RV/TLC ratio.

Question

Quizplus · Accepted Answer

In moderate restrictive lung disease, pulmonary function tests typically show a decreased Forced Vital Capacity (FVC), which may lead to a decreased FEV1 (Forced Expiratory Volume in 1 second) if the reduction in lung volume is significant. However, because the disease primarily affects lung volume and not the airways, expiratory flow rates can remain normal. The RV/TLC (Residual Volume/Total Lung Capacity) ratio is often increased due to the decreased compliance of the lung or chest wall, making it harder to fully expel air, thus increasing the proportion of air remaining in the lungs (RV) relative to the maximum amount of air the lungs can hold (TLC).

Common Pulmonary Function Abnormalities in Individuals with Moderate Restrictive Lung