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obstruction
(ob-struk´shәn)
the act of blocking or clogging.
the state or condition of being clogged; see also atresia. Called also blockade, closure, and occlusion.
chronic airflow obstruction
, chronic airway obstruction
name given to a group of disorders in which the upper or lower airways are chronically obstructed; it includes chronic bronchitis, asthma, emphysema, pneumoconiosis, and any other type of chronic obstructive pulmonary disease.

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