Background
Asthma is a chronic disease associated with inflammation of the lining of airway and obstruction of lung airflow. It usually involves an increase in the number of inflammatory cells, most commonly eosinophils and to some extent basophils, mast cells, macrophages. (Eds. Brunton, et al., 2009) Asthma, together with Chronic Obstructive Pulmonary Disease (COPD), is considered as one ofthe most common obstructive lung diseases characterized by expiratory airflow obstruction. (eds. Longo, et al., 2012)
An asthmatic patient usually presents with recurrent events of shortness of bright (SOB), chest tightness, and wheezing, “a high-pitched whistling sound when breathing caused by movement of ...