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一、肺内液体和蛋白质的交换肺部毛细血管、淋巴管、间质和肺泡的液体流动为双向性,正常时保持动态平衡。决定液体流向的因素有:①肺泡-毛细血管膜屏障的通透性;②作用于屏障的各种物理力的代数和。肺泡上皮的通透性比毛细血管内皮的要小,因此,肺泡上皮在肺泡-毛细血管膜屏障中起重要作用,这对肺水肿早期防止过多液体进入肺泡腔有重大意义。导致通透性增加的因素众多,肺部炎症、循环毒素、过敏、吸入有害气体、呼吸道烧伤、吸入胃内
First, the exchange of fluid and protein in the lungs Pulmonary capillaries, lymphatic vessels, interstitial and alveolar liquid flow is two-way, normal to maintain homeostasis. Factors that determine the flow of liquid are: ① alveolar - permeability of the capillary membrane barrier; ② algebraic sum of various physical forces acting on the barrier. The permeability of the alveolar epithelium is smaller than that of the capillary endothelium. Therefore, the alveolar epithelium plays an important role in the alveolar-capillary membrane barrier, which is of great significance for preventing too much fluid from entering the alveolar space early in the course of pulmonary edema. Many factors lead to increased permeability, lung inflammation, circulating toxins, allergies, inhalation of harmful gases, respiratory burn, inhalation of the stomach