Exudative pleural effusion

The pleural cavity is a closed cavity composed of the parietal pleura and the visceral pleura. The inside of the pleura is a negative pressure. Under normal circumstances, there is a small amount (about 1-30 ml) of fluid between the two layers of pleura for lubrication. , To reduce the friction between the two layers of pleura during the breathing process, which is conducive to the lungs contraction in the chest cavity. This fluid is produced from the parietal pleura and absorbed by the visceral pleura. It is in dynamic equilibrium with constant circulation, and the amount of fluid remains constant. When something happens that affects the pleura, whether the pleural pleura produces pleural effusion or the visceral pleura absorbs pleural effusion, the fluid in the pleural cavity can increase, which is the so-called pleural effusion (effusion). Pleural effusion can be divided into exudative pleural effusion and leaky pleural effusion.

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