Chronic bronchitis: Clinical diagnosis characterized by excessive secretion of bronchial mucus and productive cough for 3 months or more in at least 2 consecutive years in the absence of any other disease that might account for this symptom.
Chronic obstructive pulmonary disease (COPD): Disease state characterized by the presence of airflow obstruction caused by chronic bronchitis or emphysema. The airflow obstruction usually is progressive, may be accompanied by airway hyperreactivity, and may be partially reversible.
Emphysema: Pathologic diagnosis that denotes abnormal, permanent enlargement of air spaces distal to the terminal bronchiole, with destruction of their walls and without obvious fibrosis.
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