Why can't we pump the chest all at once?

With the exception of empyema, for most patients with pleural effusion, pumping pleural effusion is not a radical treatment and merely serves to relieve symptoms. That is to say, if there is no root cause, many people's chest water will grow again after pumping. The total amount of water in the human body, including blood cell fluid and intertissue fluid, is certain. If the water goes into the pleural cavity and becomes pleural fluid, the water in other parts will be reduced. If the amount of water is too large, the water of other parts will soon enter the pleural cavity, and the water of blood is reduced, which is prone to more serious conditions such as reexpansion pulmonary edema and shock.