Below I will briefly explain the purpose and precautions of clamping the drainage tube for you. Purpose: The chest cavity that has undergone surgery will have a transient increase in pleural fluid for a period of time. The function of the drainage tube is to drain the pleural fluid out, and the doctor will judge the condition by the nature and amount of the drainage fluid. When the doctor judges that the condition is stable, he or she will consider clamping the drainage tube, because this measure can increase the absorption of the chest fluid and reduce the drainage flow, thus speeding up the recovery. Your concerns: 1. You may be worried that if the pleural fluid does not flow out, will there be a risk of infection or something? A: You can rest assured that the doctor will only instruct you to clamp the drainage tube if infection is ruled out. 2.Where does the reduced pleural fluid go? A: In fact, our chest cavity has a very strong ability to absorb pleural fluid, as deduced from the results of animal tests, adults can absorb 500ml of pleural fluid per day. The pleural fluid is containing some albumin and other important raw materials for human body to promote the absorption of pleural fluid and also to avoid the loss of nutrients. However, you cannot decide to clamp the drainage tube by yourself, and your doctor needs to make individualized treatment arrangements according to your condition. Precautions after drainage tube clamping: 1.After drainage tube clamping, you can go down to the ground normally, you can breathe deeply and exercise lung function normally; 2.After drainage tube clamping, you need to avoid violent coughing, because violent coughing may cause symptoms of breath-holding; 3.After drainage tube clamping, if you have obvious discomfort, you need to contact your doctor in charge or the doctor on duty to ask if you need 4.After the drainage tube is clamped, if there is a violent cough that is difficult to suppress, the drainage tube can be opened temporarily and clamped again when the coughing is over; 5.After the drainage tube is clamped, you need to observe whether there is air accumulation around the skin of the drainage tube, under the skin of the chest and neck. When to open the drainage tube. Under normal circumstances, the drainage tube can be successfully removed after 1-3 days of clamping it closed.