慢性阻塞性肺病(COPD)在美国居死亡原因的第5位,许多患者慢性支气管炎(慢支)、哮喘和和肺气肿并存。虽肺气肿为肺脏的永久性损害,但多数哮喘和支气管炎若能去除病因(如吸烟或感染),则其病理改变尚属可逆。粘液分泌旺盛,寄生死菌的慢性聚集和粘膜水肿而引起气道阻塞是慢支和 COPD Chronic obstructive pulmonary disease (COPD) is the fifth leading cause of death in the United States, and many patients coexist with chronic bronchitis (chronic bronchitis), asthma and emphysema. Although emphysema is a permanent damage to the lungs, most pathologies of asthma and bronchitis are reversible if they are capable of removing the cause (such as smoking or infection). Strong mucus secretion, chronic aggregation of parasitic dead bacteria and mucosal edema caused by airway obstruction is chronic bronchitis and COPD