How to Fix a Pneumothorax and Re-Inflate a Lung

Fixing a pneumothorax depends on how much air has leaked into the chest cavity and how badly the lung has collapsed. Small pneumothoraces sometimes resolve with nothing more than observation and supplemental oxygen. Larger or more dangerous ones require removing the trapped air, either by inserting a needle, placing a chest drain, or, in recurring cases, performing surgery to seal the leak. The treatment ladder stretches from “wait and watch” all the way to thoracic surgery, and which rung you land on is shaped by the type and size of the collapse, how stable you are, and whether it has happened before.

Why the Type of Pneumothorax Determines the Fix

Not all collapsed lungs are created equal, and the underlying cause directly changes the treatment plan. A primary spontaneous pneumothorax strikes people with no known lung disease. It typically results from the rupture of a small air-filled sac near the lung surface, called a bleb or bulla, that the person never knew existed.¹ This is the classic scenario: a tall, thin, otherwise healthy young person suddenly feels a sharp chest pain and gets short of breath. Because the underlying lung tissue is healthy, the prognosis is usually good, and conservative management works more often.

A secondary spontaneous pneumothorax happens in someone who already has a lung condition. COPD is the most common culprit. Research in Taiwan found that COPD patients had a roughly 46% higher risk of developing pneumothorax compared to people without the disease.² Other conditions like interstitial lung disease can also cause it. Because the lungs are already compromised, these patients tolerate a collapse far worse, and treatment tends to be more aggressive from the start. Surgery carries extra risk in this group as well: patients with interstitial lung disease who undergo pneumothorax surgery have worse long-term outcomes than those with COPD-related collapses.³

Traumatic pneumothorax follows a blow to the chest, a stab wound, a car accident, or a fractured rib puncturing the lung. And iatrogenic pneumothorax is the medical-procedure variety, most often caused by mechanical ventilation. In ventilated patients, the risk of pneumothorax is tied far more closely to the underlying disease than to the ventilator pressures themselves. Patients with ARDS face the highest risk, while pneumothorax is rare in intubated patients whose lungs were previously healthy.^{4 5}

Diagnosing It Before You Fix It

You cannot treat a pneumothorax you have not found, and missed diagnoses are a real problem, particularly in trauma bays where patients are lying flat. Chest X-ray has long been the default, but its sensitivity is surprisingly poor when the patient is supine. One study of trauma patients found that upright X-rays correctly identified pneumothorax only about 69% of the time.⁶ Bedside ultrasound does substantially better. A systematic review and meta-analysis across emergency departments found that ultrasound had a sensitivity of about 79% compared to roughly 48% for chest X-ray, with both methods sharing similarly high specificity near 99%.⁷ In critically ill patients, another prospective study showed ultrasound sensitivity of about 86% versus 53% for bedside chest X-ray.⁸

CT scan remains the gold standard for both detection and sizing, but it is not always practical in an emergency. The real-world takeaway is that ultrasound has become the first-line bedside tool in many emergency departments and ICUs because it picks up pneumothoraces that X-rays miss, and it is fast enough to use while resuscitating a patient.

When the Lung Can Re-Inflate on Its Own

A small pneumothorax in a stable, otherwise healthy patient sometimes does not need any invasive procedure at all. The body reabsorbs trapped pleural air gradually on its own, at a rate of roughly 1–2% of the hemithorax volume per day. Supplemental oxygen speeds this up. The mechanism is straightforward: breathing high-concentration oxygen washes nitrogen out of the blood, which widens the pressure difference between the air trapped in the pleural space and the blood flowing past it. That steeper gradient pulls nitrogen from the pleural cavity into the bloodstream faster, shrinking the pneumothorax.⁹

Conservative management typically involves admission for monitoring, serial imaging, and oxygen. It works best for small primary spontaneous pneumothoraces where the patient is comfortable and not hypoxic. Larger collapses, secondary pneumothoraces in patients with underlying lung disease, and anyone who is struggling to breathe generally need something more active.

Emergency Needle Decompression

Tension pneumothorax is the most dangerous form. It happens when a one-way valve effect develops at the injury site: air enters the pleural space with each breath but cannot escape. Pressure builds, eventually compressing the heart and great vessels and causing cardiovascular collapse.¹⁰ This is a medical emergency that can kill in minutes.

The immediate fix is needle decompression: driving a large-bore needle through the chest wall to release the trapped pressurized air. The question of exactly where to place the needle has been debated for years. Two sites are commonly used: the second intercostal space along the midclavicular line (basically, just below the collarbone toward the side) and the fourth or fifth intercostal space along the midaxillary line (at the side of the chest). A meta-analysis found that a 7 cm needle works at either site for right-sided tension pneumothorax, but for left-sided cases, the midclavicular approach is safer because it avoids the heart.¹¹

Body habitus matters. In overweight and obese patients, the chest wall is thicker at the side of the chest, which makes the midclavicular line a better bet because the needle is more likely to actually reach the pleural space.¹² Meanwhile, a pilot study using ultrasound to measure chest wall thickness found that the fifth intercostal space was actually thinner than the second in its patient sample, suggesting ultrasound guidance could help clinicians choose the best site in real time.¹³ Needle decompression is always a bridge, not a definitive fix. It buys time until a chest tube can be placed.

Chest Tubes and Pigtail Catheters

The workhorse treatment for most clinically significant pneumothoraces is a chest drain. A flexible plastic tube is inserted through the chest wall into the pleural space to evacuate air (or fluid), typically connected to a one-way drainage system that prevents air from flowing back in.¹⁴ The lung gradually re-expands as the trapped air leaves and the normal negative pressure in the chest cavity is restored.

A growing body of evidence now favors smaller pigtail catheters over traditional large-bore chest tubes for many pneumothorax cases. In a randomized trial of trauma patients, pigtail catheters produced dramatically less pain at the insertion site: pain scores averaged about 3.2 out of 10 for pigtail catheters versus roughly 7.7 for chest tubes after placement.¹⁵ Success rates between the two devices were similar. A separate randomized trial in spontaneous pneumothorax found comparable effectiveness, with significantly less pain during both insertion and removal in the pigtail group and lower analgesic use overall.¹⁶

A meta-analysis of seven studies in adult thoracic trauma patients found that the pigtail catheter group actually had higher initial drainage output and that patients with traditional chest tubes were nearly three times as likely to require a follow-up surgical procedure (VATS).¹⁷ This does not necessarily mean pigtail catheters prevent surgery; it may reflect selection bias in which patients got which device. But the overall trend in the literature is clear: for uncomplicated pneumothorax, a small-bore catheter often does the job with considerably less discomfort.

Going Home with a Drain

Traditionally, a chest drain meant staying in the hospital until the air leak resolved and the tube could be pulled. That model is shifting. Ambulatory management uses a one-way valve (often a Heimlich valve) attached to the chest drain, which lets air and fluid escape into a collection bag but blocks anything from flowing back in. The valve works in any position and does not require suction, so the patient can carry the bag and go home.¹⁸

A systematic review found that outpatient management with a Heimlich valve was successful in about 78% of cases, with serious complications being rare and long-term outcomes comparable to inpatient care.¹⁹ A case series looking specifically at secondary spontaneous pneumothorax, which is generally considered harder to treat, found that about 65% of those patients achieved full resolution by day five using ambulatory drains, compared to 79% for primary spontaneous pneumothorax. Complication rates were low in both groups, and patient satisfaction scores were nearly perfect.²⁰

Ambulatory care is not appropriate for everyone. Patients who are hypoxic, hemodynamically unstable, or who have a large ongoing air leak still need inpatient observation. But for stable patients with a straightforward pneumothorax, being treated at home with scheduled outpatient reviews is increasingly the norm in many centers.

When Surgery Becomes Necessary

Surgery typically enters the picture in two scenarios: when an air leak persists despite drainage (usually beyond five to seven days), or when the pneumothorax keeps coming back. The standard procedure is video-assisted thoracoscopic surgery (VATS), a minimally invasive approach using small incisions and a camera. The surgeon identifies and removes the offending blebs or bullae, then usually performs some form of pleurodesis to discourage recurrence.

Pleurodesis is the deliberate scarring of the pleural surfaces so they stick together, eliminating the potential space where air can accumulate. This can be done mechanically (roughing up the pleural lining with an abrasive), chemically (insufflating talc or another irritant), or simply by stripping a portion of the parietal pleura. The goal is the same in each case: trigger an inflammatory healing response that fuses the lung surface to the chest wall.²¹

The data strongly support combining bullectomy with pleurodesis rather than performing bullectomy alone. One study found a recurrence rate of about 2% when pleurodesis was added, compared to 16% with bullectomy only.²² Even with combined surgery, recurrence is not zero. Research has shown that new blebs can form along the staple line used to remove the original ones, and this substantially raises the risk of the pneumothorax coming back.²³ That finding has led some surgeons to rethink how much tissue margin they take during the initial procedure.

Re-Expansion Pulmonary Edema

One complication worth knowing about is re-expansion pulmonary edema, or RPE. When a lung that has been collapsed for a while suddenly re-inflates, the newly opened tissue can flood with fluid. It is rare but can be serious, and the risk rises with the speed and aggressiveness of re-expansion. How much suction is applied through the drain and how quickly fluid is evacuated both play a role.²⁴ This is one reason clinicians sometimes use low suction or water-seal drainage rather than maximum vacuum when managing a large or long-standing pneumothorax. A controlled, gradual re-expansion is safer than an abrupt one.

Catamenial Pneumothorax

One of the more unusual and frequently underdiagnosed subtypes is catamenial pneumothorax, which occurs in women with thoracic endometriosis. The lung collapse typically happens within 72 hours of the start of menstruation.²⁵ It most commonly affects women in their thirties and forties, though it has been reported as early as age 10. The mechanism involves endometrial tissue implanting on the pleural surfaces; these implants break down during menstruation or swell with hormonal changes, creating tiny openings for air to enter the chest cavity.²⁶

The condition is considered the most common manifestation of thoracic endometriosis syndrome.²⁵ It tends to recur, and standard chest-drain treatment does not address the underlying cause. Management usually involves surgery to remove the pleural implants and pleurodesis to prevent further episodes, often combined with hormonal therapy to suppress the endometrial tissue. The diagnosis is frequently delayed because clinicians do not always think to ask about the timing relative to menstruation, and many young women with recurrent pneumothorax are initially assumed to have the primary spontaneous variety.²⁷

Flying and Altitude After a Pneumothorax

One of the most common questions people have after a pneumothorax is when they can get on an airplane. At cruising altitude, commercial aircraft cabins are pressurized to the equivalent of about 8,000 feet above sea level. That lower pressure causes any trapped gas to expand. A pneumothorax occupying 10% of the chest space at sea level would theoretically grow to about 13.5% at cabin altitude, an increase of roughly 35%.²⁸

For a small, fully resolved pneumothorax in an otherwise healthy person, this math suggests the risk of a clinically meaningful expansion is low. Current guidelines generally recommend waiting at least one to two weeks after confirmed radiographic resolution before flying, though practice varies. For larger collapses, recurrent pneumothoraces, or patients with underlying lung disease, the wait is longer and should be discussed with a specialist. Diving is a separate and even more restrictive consideration, because the pressure changes underwater are far more extreme than those in an aircraft cabin. Many thoracic surgeons advise permanent avoidance of scuba diving after a spontaneous pneumothorax, though some will clear patients after definitive surgical repair.

The Historical Twist of Intentional Collapse

In an ironic footnote, doctors once created pneumothoraces on purpose. Before effective anti-tuberculosis drugs existed, artificial pneumothorax was a standard treatment for pulmonary TB. Air was deliberately introduced into the pleural space to collapse the infected lung, which was thought to starve the tuberculosis bacteria of oxygen, close off cavities in the lung tissue, and promote healing. The technique was developed in the late 19th century and remained in widespread use until the middle of the 20th century, when drug therapy made it obsolete. It is a striking reminder that a condition we now treat as an emergency was once considered a therapeutic intervention.