True regarding Restrictive lung disease is all except?
**Core Concept**
Restrictive lung diseases are characterized by a reduction in lung volumes and capacities due to a problem with the lung parenchyma or the chest wall. This can be caused by various factors, including interstitial lung diseases, neuromuscular disorders, and conditions affecting the chest wall.
**Why the Correct Answer is Right**
Restrictive lung diseases are typically associated with a decrease in lung volumes, such as vital capacity (VC) and total lung capacity (TLC). The key pathophysiological mechanism underlying restrictive lung diseases is the stiffening of the lung parenchyma or the chest wall, making it difficult for the lungs to expand properly. This can lead to a reduction in the amount of air that can be inhaled and exhaled.
**Why Each Wrong Option is Incorrect**
**Option A:** Restrictive lung disease is often associated with a decreased FEV1/FVC ratio, which is a hallmark of obstructive lung diseases, not restrictive lung diseases.
**Option B:** The chest radiograph in restrictive lung disease may show hyperinflation of the lungs, which is more characteristic of obstructive lung diseases.
**Option C:** Restrictive lung disease is not typically associated with an increased residual volume (RV), as the lungs are unable to fully expand and hold air.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of restrictive lung disease is the patient's difficulty in exhaling air from the lungs, leading to a prolonged expiration and a characteristic "baggy" or "barrel-shaped" chest.
**Correct Answer: A. Restrictive lung disease is often associated with a decreased FEV1/FVC ratio, which is a hallmark of obstructive lung diseases, not restrictive lung diseases.**