Emphysema- Abnormal, permanent enlargement of the airspaces distal to the terminal bronchiole, accompanied by destruction of their walls.
Chronic bronchitis-chronic cough and sputum production for at least 3 months per year for two consecutive years, in the absence of other conditions that can explain these symptoms .
Reference
Fishman 6 th edition
Gold 2024
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.Dr.Ilangho