ABSTRACT
Asthma is a complex heterogeneous disease characterized by chronic airway infl ammation, airway hyper responsiveness, and variable airflow obstruction that reverses either spontaneously or with treatment. The hallmark respiratory symptoms that result include shortness of breath, wheezing, coughing and chest tightness; symptoms are often worse in the night or early morning.1 Asthma is a common condition that is responsible for signifi cant morbidity and mortality throughout the world. Over recent decades, its worldwide prevalence has increased. There have been many advances in our understanding of asthma pathophysiology and in therapeutic options over this time as well.
