Pleurodesis is a procedure that seals together the two thin membranes surrounding your lungs so that fluid or air can no longer build up in the space between them. Your lungs are wrapped in a double-layered lining called the pleura, with a small gap between the layers that normally holds just a thin film of lubricating fluid. When that gap repeatedly fills with excess fluid (pleural effusion) or air (pneumothorax), breathing becomes difficult. Pleurodesis permanently closes the gap by making the two layers stick together, preventing the problem from coming back.
Why Pleurodesis Is Done
The most common reason is a malignant pleural effusion, where cancer causes fluid to accumulate around the lungs faster than the body can reabsorb it. This happens most often with metastatic breast, ovarian, or lung cancers. Draining the fluid with a needle provides temporary relief, but when it keeps returning despite standard treatment, pleurodesis offers a more lasting solution.
The procedure is also used for recurrent pneumothorax, where the lung collapses repeatedly because air leaks into the pleural space. This can happen on its own (spontaneous pneumothorax) or as a complication of lung diseases like COPD or cystic fibrosis. Beyond cancer and collapsed lungs, pleurodesis can treat stubborn fluid buildup caused by heart failure, kidney disease, or liver problems when other treatments haven’t worked.
Chemical vs. Mechanical Pleurodesis
There are two main approaches, and they achieve the same goal through different means: triggering enough irritation on the pleural surfaces that they inflame, scar, and fuse together as they heal.
Chemical pleurodesis delivers a sclerosing agent, a substance that deliberately irritates tissue, through a chest tube already in place. Sterile talc is the most widely used agent. Other options include doxycycline and bleomycin. The agent is mixed with saline and a local anesthetic, then instilled into the pleural space. This can often be done at the bedside without general anesthesia, making it a practical choice for patients who are too ill for surgery.
Mechanical (surgical) pleurodesis is performed in an operating room, most often using video-assisted thoracoscopic surgery (VATS), a minimally invasive technique using small incisions and a camera. The surgeon physically scrapes or abrades the pleural surfaces with gauze or a specialized tool, creating the same inflammatory response that makes the layers stick together. In some cases, the surgeon may also remove part of the outer pleural layer entirely (a pleurectomy) or repair the source of an air leak, such as a blister on the lung surface. Open surgery through a larger incision is reserved for more complex situations.
How Effective It Is
For malignant pleural effusions, chemical pleurodesis succeeds in roughly 80% of cases. An analysis of 285 patients found an overall success rate of 81.4%, meaning the fluid did not return in a clinically significant way. Success rates vary somewhat depending on the type of cancer. Patients with mesothelioma had a lower success rate of about 73%, compared to roughly 85% for other cancers.
For the procedure to work, the lung needs to be able to fully expand and make contact with the chest wall. If the lung is “trapped,” meaning scar tissue or tumor prevents it from inflating completely, the two pleural surfaces can’t touch and won’t fuse. In these cases, doctors typically recommend an indwelling pleural catheter instead, a small tube that stays in place so fluid can be drained at home over time.
What the Procedure Feels Like
If you’re having chemical pleurodesis at the bedside, you’ll already have a chest tube in place from having fluid or air drained. A local anesthetic (typically lidocaine) is mixed with the sclerosing agent and delivered through the tube. The British Thoracic Society guidelines emphasize that adequate pain relief should be given both before and after treatment. Despite this, chest pain during and after the procedure is common, because the whole point is to inflame sensitive tissue. You may be asked to shift positions periodically so the chemical agent coats the entire pleural surface.
For surgical pleurodesis under general anesthesia, you’ll be asleep during the procedure itself. Pain afterward is managed with medication, and you’ll wake up with a chest tube in place to drain any remaining fluid or air while the pleural layers begin to heal.
Risks and Side Effects
Pleurodesis is not a minor procedure, and side effects are common. In one study of patients with malignant pleural effusions, about 68% experienced at least one adverse effect, and 28% had at least one that was classified as severe.
The most frequent side effects are pain and low-grade fever, both direct consequences of the intentional inflammation. In a meta-analysis of over 1,500 patients, pain, fever, and wound infection were the most commonly reported problems. More concerning is hypoxemia, a drop in blood oxygen levels. In one dataset, 17 patients developed significant hypoxemia requiring continuous supplemental oxygen.
The most serious risk is acute respiratory distress syndrome (ARDS), a severe lung reaction. Some studies have reported ARDS rates as high as 9%, though others suggest it’s rare when medical-grade talc is properly prepared. Research has linked ARDS primarily to talc products containing a high proportion of very small particles, which can be absorbed into the bloodstream and affect other organs. Modern graded talc, such as the FDA-approved formulation, is processed to remove these smaller particles, which appears to improve safety. The FDA has confirmed that when asbestos-free talc is used, cancer risk from the talc itself is not a serious concern.
Recovery After Pleurodesis
You’ll stay in the hospital with a chest tube in place while doctors monitor for complications and confirm that the pleural space is sealing. The tube typically remains for one to several days, depending on how much fluid or air continues to drain. Once output drops to a minimal level and imaging shows the lung is expanded, the tube is removed.
Chest soreness can last for days to weeks as the inflammation resolves and the pleural layers fuse. Some people notice a pulling or tightness on the affected side during deep breaths, which generally improves over time. Full recovery depends heavily on the underlying condition. Someone treated for a collapsed lung may bounce back relatively quickly, while a patient with advanced cancer may have a longer and more variable course.
Who Should Not Have Pleurodesis
The procedure won’t work if the lung can’t fully expand to meet the chest wall, as is the case with trapped lung. It’s also not appropriate when the underlying condition causing the fluid buildup can be treated more directly, since pleurodesis is essentially a last line of defense when the root cause can’t be eliminated. Patients who are extremely frail may not tolerate the inflammatory response well, and the decision involves weighing the burden of the procedure against the burden of repeated fluid drainage. All treatment options, including less invasive alternatives like indwelling catheters, should be discussed so patients can choose based on their own priorities.