A pneumothorax is commonly known as a collapsed lung. Normally, the outer surface of the lung sits next to the inner surface of the chest wall. The lung and the chest wall are covered by thin membranes called pleura. A collapsed lung occurs when air escapes from the lungs or leaks through the chest wall and enters the space between the two membranes (pleural cavity). As air builds up, it causes the nearby lung to collapse.

A collapsed lung is usually caused by an injury to the lungs or chest wall, such as:

• A penetrating injury, such as a knife or gunshot wound
• Blunt trauma from a fall or car accident
• Medical procedures, such as removal of fluid from the pleural cavity with a needle (thoracentesis) or a lung biopsy

Occasionally, a lung will collapse without any direct injury to the lung or chest. This happens when the lung is damaged by diseases such as asthma, cystic fibrosis and pneumonia. It is particularly common in emphysema, which causes air-filled sacs, called blebs, to form. When one of these sacs bursts, air is released into the pleural cavity, causing the lung to collapse. A spontaneous pneumothorax also can develop in people who don't have any obvious lung disease. It's most common in tall, thin men between the ages of 20 and 40 and is much more common in smokers. Some people who don't have any obvious lung disease have blebs that can rupture and cause this type of spontaneous pneumothorax.

In most cases of pneumothorax, some air can move in and out through the tear in the lung or chest wall. If air can only move into the chest cavity, but not out, a condition called a tension pneumothorax can occur. A growing air pocket causes increased pressure within the pleural cavity. This can cause complete collapse of the nearby lung and can push the heart and major blood vessels to the other side of the chest. This movement, called a mediastinal shift, can cause a life-threatening drop in blood pressure. Tension pneumothorax most commonly occurs in people with penetrating chest injuries. It also occurs in people on ventilators or those who have undergone cardiopulmonary resuscitation.

About 9 of every 100,000 people each year have a lung collapse.

Symptoms of a collapsed lung include:

• Sudden shortness of breath
• Painful breathing
• Sharp chest pain, often on one side
• Chest tightness
• Dry, hacking cough
• Rapid heart rate

Symptoms of a tension pneumothorax are similar and might also include:

• Bluish color skin (because of a lack of oxygen)
• Engorgement of the neck veins
• Low blood pressure or shock

Your doctor may suspect you have a collapsed lung if you suddenly develop shortness of breath or chest pain, especially if you have had trauma to the chest. He or she will ask about your symptoms, your medical history and your smoking habits.

Your doctor will examine you, focusing on your general appearance, your vital signs (temperature, pulse, breath rate, blood pressure), and your heart and breath sounds. The following signs can indicate that you have a collapsed lung:

• Low blood pressure
• Rapid heart rate
• Low levels of blood oxygen
• Loss of normal breath sounds in the part of the chest where the lung is deflated
• A hollow sound when the fingers are tapped on part of the chest
• A shift in the normal location of heart sounds

A chest X-ray is the best way to confirm that you have a collapsed lung. The X-ray will show the collapsed lung as a dark area in the chest. A computed tomography (CT) scan may be needed in some cases to find a small collapsed area of a lung or for people with extensive lung disease.

Your doctor may check the oxygen level in your blood with a handheld device called a pulse oximeter or may draw blood from an artery in the wrist (an arterial blood gas test) to directly measure the levels of oxygen and carbon dioxide in your blood. He or she also may order an electrocardiogram (EKG), an electrical test of the heart.

Once the cause of pneumothorax is treated, a collapsed lung usually will return to normal within 48 to 72 hours. Recovering from a collapsed lung may take up to several weeks.

Most cases of collapsed lung cannot be prevented. Quitting smoking can reduce your risk of developing the types of lung disease associated with this problem. Wearing your seat belt in the car and avoiding other activities that put you at risk of chest injuries can help you to avoid a collapsed lung caused by trauma.

A collapsed lung can be treated in several different ways. Your doctor will choose the right treatment based on several factors, including the size and location of the collapsed lung and your medical condition.

Treatment options include:

• Careful observation by a doctor to see if the condition corrects itself on its own
• Removal of the air from the pleural cavity with a needle and syringe
• Removal of the air from the pleural cavity by inserting a hollow plastic tube, called a chest tube, between the ribs and attaching it to a suction device

If you need to be admitted to the hospital for treatment, you will likely receive oxygen for the first couple of days.

You may be treated or observed for several days to make sure the pneumothorax goes away completely. If you have had a serious chest injury or treatment does not expand your lung, your doctor will discuss the possibility of surgery to repair the lung and pleura. Sometimes damaged or scarred portions of lung are removed to allow the collapsed lung to heal. Traditional surgery requires the chest to be opened. But newer techniques using tiny cameras (thoracoscopy) cause less scarring and result in faster recovery times.

People who keep developing a collapsed lung may need treatment to prevent it from happening again. Options include:

• Surgery that removes blebs or areas of scarring or that attaches the lung permanently to the chest wall
• A chemical injection that fuses the lung and chest wall together (pleurodesis)

Call your doctor if you have symptoms of collapsed lung, especially if you have lung disease or have had a collapsed lung before. Even if your symptoms seem to improve, call your doctor. Some people with collapsed lung notice that chest pain and shortness of breath improve in the first 24 hours, but the lung is still collapsed.

Once a collapsed lung has expanded again, there is usually no long-term effect on your health. However, up to 50% of people have a lung collapse again, especially within a few months of the first one. To decrease the risk of a second collapsed lung:

• Stop smoking.
• Avoid changes in air pressure, such as from flying in unpressurized aircraft or scuba diving.

National Heart, Lung, and Blood Institute (NHLBI)
P.O. Box 30105
Bethesda, MD 20824-0105
Phone: 301-592-8573
TTY: 240-629-3255
Fax: 301-592-8563
Email: nhlbiinfo@rover.nhlbi.nih.gov
http://www.nhlbi.nih.gov/

American Lung Association
61 Broadway, 6th Floor
New York, NY 10006br />Phone: 212-315-8700
Toll-Free: 1-800-548-8252Email: info@lungusa.org
http://www.lungusa.org/