Chronic obstructive pulmonary disease, clinically term for a group of a pathological condition in which there is a chronic, partial or complete obstruction to the airway at any level from the trachea to the smallest airway resulting in functional disability of lungs. It includes the following 4 pathological conditions-

  1. Chronic Bronchitis
  2. Emphysema
  3. Bronchial asthma
  4. Bronchiectasis

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