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Chronic obstructive lung diseases (COPD) are a group of related pulmonary diseases that involve obstruction to airflow in the bronchial tree. Examples of COPD include emphysema, chronic bronchitis, asthma, cystic fibrosis and bronchiectasis. When patients are easily characterized into one of these specific disease patterns, physicians frequently refer to the individual disease name and reserve the broader term "COPD" for times when a patient has elements of more than one of these disease processes simultaneously. The most common combination of obstructive lung diseases where the term COPD is used is a mixed pattern of emphysema and chronic bronchitis in current or reformed smokers.

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