All the following statements about Emphysema are true except
**Core Concept**
Emphysema is a type of chronic obstructive pulmonary disease (COPD) characterized by the destruction of alveoli, leading to breathlessness, wheezing, and coughing. The primary pathophysiological mechanism involves the breakdown of elastic fibers and alveolar walls, resulting in air trapping and impaired gas exchange.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of emphysema. Emphysema is primarily caused by the chronic inhalation of noxious particles, such as cigarette smoke, which leads to the activation of neutrophils and macrophages in the lungs. These cells release proteases, including elastase, which breaks down and destroys the elastic fibers in the alveolar walls. This destruction results in the loss of lung elastic recoil and the formation of bullae, leading to the characteristic symptoms of emphysema.
**Why Each Wrong Option is Incorrect**
* **Option A:** This statement is incorrect because emphysema is not primarily caused by impaired cilia function. While cilia dysfunction can contribute to respiratory infections, it is not a primary factor in the development of emphysema.
* **Option B:** This statement is incorrect because emphysema is not characterized by an increase in lung compliance. In fact, emphysema is associated with a decrease in lung compliance due to the destruction of elastic fibers and the loss of lung elastic recoil.
* **Option D:** This statement is incorrect because emphysema is not primarily caused by an allergic reaction. While some cases of COPD may be triggered by allergic reactions, emphysema is primarily caused by the inhalation of noxious particles, such as cigarette smoke.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of emphysema is the presence of hyperinflation of the lungs, which can lead to the formation of bullae. These bullae can be a source of complications, including pneumothorax and pneumomediastinum.
**Correct Answer: A.**