胸腔积液(Pleural effusion)是一组临床表现,其产生主要取决于胸膜脏壁两层各自的驱液压及压差(正常壁层胸膜驱液压为9,脏层胸膜驱液压为-10,两层间驱液压差为19)。正常情况下此压保持相对稳定,使胸膜腔内有少量液体并保持着动态平衡。任何病理原因可致其发生改变即产生胸腔积液。其产生机理 Pleural effusion is a group of clinical manifestations, the production depends mainly on the displacement of the two layers of the pleural wall of the respective hydraulic and pressure (normal wall pleural fluid pressure is 9, visceral pleural fluid pressure is -10, two Inter-layer drive hydraulic pressure difference of 19). Under normal circumstances the pressure remained relatively stable, so that a small amount of liquid within the pleural cavity and maintain a dynamic balance. Any pathological causes can cause changes that produce pleural effusion. Its mechanism