When will we use negative pressure drainage during closed thoracentesis needle drainage?

Generally speaking, if the closed drainage treatment lasted for more than one week, there are still bubbles coming out, indicating that the breach has not healed. Negative pressure suction should be added to facilitate lung recruitment to close the breach. Generally, -3~-14 cmH2O is used. Large-capacity pumps (such as Vernon-Thompson) can be used for negative pressure suction in the process of negative pressure suction. Because low-volume pumps (such as Roberts pumps) cannot cope with rapid flow rates, a situation similar to clamping is caused. Tension pneumothorax is dangerous, so it is not suitable. The suction negative pressure should not be too large. If it is too large, it may cause the lung to re-expand too quickly and cause recruitment pulmonary edema. At this time, you can put a pressure regulator tube in the water-sealed bottle or use the double water-sealed bottle connection method to solve this problem. One problem.

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