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In page Chest drainage:

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External suction (previously referred to as active suction) is used to create a sub-atmospheric pressure at the tip of a catheter. As the atmospheric pressure is lower compared to the intrapleural pressure, the lack of external suction (which was previously referred to as passive suction) is used to drain air and fluids.[1] Traditional drainage systems are not able to suction sub-atmospheric pressure in the pleural space. These systems only allow for a regulation of pressure via the system itself but cannot regulate sub-atmospheric pressure in the pleural space.[citation needed]