Pulmonary Air Trapping

Pulmonary air trapping occurs when air becomes abnormally retained in the lungs during exhalation, leading to overinflation of alveoli and increased residual lung volume. This phenomenon is commonly observed in obstructive airway disorders, such as asthma, chronic obstructive pulmonary disease, and bronchiolitis, and may contribute to hyperinflation, impaired gas exchange, and increased work of breathing. Patients often present with shortness of breath, exercise intolerance, and a sensation of chest tightness, particularly during exacerbations or periods of airway inflammation.

Assessment of pulmonary air trapping involves imaging techniques such as high-resolution computed tomography, which can reveal areas of hyperlucency and localized overinflation, as well as pulmonary function testing that demonstrates increased residual volume and elevated total lung capacity. In some cases, dynamic expiratory imaging can provide additional insights into the severity and distribution of trapped air.

Management strategies focus on improving airway patency and minimizing factors that contribute to airflow obstruction. Bronchodilator therapy, anti-inflammatory medications, and adherence to inhaler techniques are critical components. Pulmonary rehabilitation and controlled breathing exercises can enhance ventilation efficiency and reduce dyspnea. In more severe or refractory cases, interventional procedures such as bronchoscopic lung volume reduction may be considered. Ongoing research into airway remodeling, novel pharmacologic agents, and personalized respiratory therapies aims to further reduce air trapping and improve functional outcomes. By addressing both the underlying cause and the mechanical consequences, management of pulmonary air trapping seeks to optimize lung mechanics, ease breathing, and support daily activity.