Chronic Obstructive pulmonary disease (COPD) is Asthma, Chronic Bronchititis, and Emphysema, all of thise diseases cause obstruction of the airways, Asthma is a disease of inflamation (which causes swelling) and constriction, which narrows the airways, That's why two medications are needed, one an anti-inflamatory, and a broncho-dilator. Emphysema is a disease in which the small airways become damaged and distroyed, becoming like tissue paper, colapsing and obstructing the airway. Chronic Bronchititis is a disease which large amounts of thick secretions are produced which obstruct the airways.
Many times a patient with one of these diseases also has some of the others. This is true less often with Asthma, especially if the patient has never been a smoker.
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