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吸烟是肺气肿发病的重要危险因素,这种慢性疾病形成的原因,与肺组织中过多的弹性蛋白酶有关。许多方面研究证明嗜中性白细胞是弹性蛋白酶的主要来源,首先,动物实验证明:纸烟引起动物肺实质嗜中性细胞积累,其次,人的嗜中性白细胞的弹性蛋白酶注入动物气管内能很快诱发肺气肿的改变,第三,有些研究二者似乎相关,即肺气肿的发病与吸烟者周围血循中嗜中性细胞弹性酶水平有关。许多动物模型说明吸入烟雾使肺内嗜中性细胞增加,但不知是否人类也相似。因此,作者选择年龄相仿,例数相等,既往和现在无肺部疾病
Smoking is an important risk factor for the development of emphysema. The cause of this chronic disease is related to the excessive elastase in lung tissue. Many studies have shown that neutrophils are the main source of elastase. First, animal experiments show that cigarette smoke causes the accumulation of parenchymal neutrophils in the lungs of animals, and secondly, human neutrophil elastase is injected into the trachea of animals very quickly Induced emphysema changes, and thirdly, some studies seem to be related to the fact that the incidence of emphysema is related to the level of neutrophil elastase in the bloodstream around the smoker. Many animal models show that inhalation of smoke causes increased neutrophils in the lungs, but I do not know if humans are similar. Therefore, the authors choose the same age, the same number of cases, past and present no lung disease