Chronic obstructive pulmonary disease (COPD), also known as chronic airflow limitation, is a group of disorders associated with persistent or recurrent obstruction of airflow, which include chronic bronchitis, emphysema and asthma. These conditions frequently overlap. Most commonly, bronchitis and emphysema occur together. Asthma frequently occurs alone without the triad of bronchitis, emphysema and asthma. The […]