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Senile emphysema

Emphysema is the excessive expansion of the distal part of the terminal bronchioles (including respiratory bronchioles, alveolar ducts, alveolar sacs and alveoli), accompanied by the destruction of the air cavity wall. In 1987, the American Thoracic Society (ATS) revised the definition of emphysema: "the distal part of the terminal bronchiole has irreversible expansion with destruction of the alveolar wall, but there is no obvious fibrosis". The basic characteristics of emphysema are over inflation of lung tissue and airflow obstruction in the ventilation part, so it is called "obstructive pulmonary emphysema".


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