慢性支气管炎（慢支炎）是中老年人最常见的呼吸道疾病之一，主要病理变化是气管、支气管的慢性非特异性炎症，表现为支气管粘膜充血、水肿、分泌物增多，支气管粘膜下腺体肥厚。在后期，支气管周围组织也可发生炎症，纤维组织增生，久之，支气管管径变得狭窄，肺气肿、肺... Chronic bronchitis (chronic bronchitis) is one of the most common respiratory diseases in the elderly, the main pathological changes of the trachea, bronchial chronic non-specific inflammation, manifested bronchial mucosal congestion, edema, increased secretions, bronchial submucosal glands Hypertrophic. In the later stage, inflammation of the peribronchial tissue may also occur, fibrosis, a long time, the bronchial diameter becomes narrow, emphysema, lung ...