What is Respiratory Bronchiolitis?
Respiratory Bronchiolitis (RB) is a lung condition characterized by inflammation of the small airways (bronchioles). It is commonly associated with smoking and often found incidentally on lung biopsies. RB can cause mild respiratory symptoms and is considered a precursor to a more severe form called respiratory bronchiolitis-associated interstitial lung disease (RB-ILD).
What Causes Respiratory Bronchiolitis?
The primary cause of RB is:
- Cigarette smoking, which leads to inflammation and accumulation of pigmented macrophages in the bronchioles
Other potential contributors include:
- Exposure to environmental pollutants or inhaled toxins
- Occupational exposures (less common)
What Are the Symptoms of Respiratory Bronchiolitis?
Many people with RB are asymptomatic, but symptoms can include:
- Persistent cough
- Mild shortness of breath, especially with exertion
- Fatigue
- Wheezing or chest discomfort (less common)
How Is Respiratory Bronchiolitis Diagnosed?
Diagnosis involves:
- Clinical history with emphasis on smoking and exposure
- Chest X-ray or CT scan showing small airway inflammation or changes
- Pulmonary function tests demonstrating mild airflow obstruction or restriction
- Lung biopsy may be required for definitive diagnosis, showing characteristic pigmented macrophages in bronchioles
- Exclusion of other lung diseases with similar features
What Are the Treatment Options for Respiratory Bronchiolitis?
Treatment focuses on:
- Smoking cessation, the most critical step to halt disease progression
- Supportive care including bronchodilators or corticosteroids in some cases
- Avoidance of environmental or occupational lung irritants
- Monitoring lung function regularly
- Pulmonary rehabilitation for symptomatic relief
Can Respiratory Bronchiolitis Cause Complications?
Potential complications include:
- Progression to respiratory bronchiolitis-associated interstitial lung disease (RB-ILD)
- Chronic obstructive pulmonary disease (COPD) development in smokers
- Persistent respiratory symptoms affecting quality of life
