In Bronchiolitis followings is/are seen-
**Core Concept**
Bronchiolitis is a common lower respiratory tract infection in infants and young children, characterized by inflammation and congestion of the small airways (bronchioles). The condition is often caused by viral infections, such as respiratory syncytial virus (RSV), which triggers an immune response and leads to airway obstruction.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of bronchiolitis, which involves the obstruction of small airways due to mucus production, edema, and inflammation. This leads to hypoxia and respiratory distress in affected infants. The airway obstruction is exacerbated by the small diameter of the bronchioles, which makes them prone to collapse and further narrowing of the airway lumen.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not accurately describe a characteristic of bronchiolitis. While wheezing may be present in some cases, it is not a hallmark feature of the condition.
* **Option B:** This option is incorrect as it is more commonly associated with asthma or cystic fibrosis, rather than bronchiolitis.
* **Option C:** This option is incorrect as it is not a characteristic of bronchiolitis. The condition is not typically associated with a significant increase in lung volume or hyperinflation.
* **Option D:** This option is incorrect as it is not a characteristic of bronchiolitis. The condition is not typically associated with a significant increase in lung compliance or a decrease in the work of breathing.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of bronchiolitis is the presence of wheezing, which is often accompanied by a characteristic "bubbly" or "tracheal" sound on auscultation. This is due to the obstruction of small airways and the resulting turbulence of airflow.
**Correct Answer:** A. Wheezing.