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A.D.A.M. Medical Encyclopedia [Internet]. Atlanta (GA): A.D.A.M.; 2013.

A.D.A.M. Medical Encyclopedia.

Pneumomediastinum

Mediastinal emphysema

Last reviewed: August 30, 2012.

Pneumomediastinum is air in the mediastinum. The mediastinum is the space in the middle of the chest, between the lungs.

Causes, incidence, and risk factors

Pneumomediastinum is uncommon. The condition can be caused by injury or disease. Most often, it occurs when air leaks from any part of the lung or airways into the mediastinum.

Increased pressure in the lungs or airways may be caused by:

  • Excessive coughing
  • Repeated bearing down to increase abdominal pressure (such as pushing during childbirth or a bowel movement)
  • Sneezing
  • Vomiting

It may also happen after:

  • An infection in the neck or center of the chest
  • Rapid rises in altitude, SCUBA diving
  • Tearing of the esophagus (the tube that connects the mouth and stomach)
  • Tearing of the trachea (windpipe)
  • Use of a breathing machine
  • Using inhaled recreational drugs such as crack cocaine

Pneumomediastinum also can occur with pneumothorax or other diseases.

Symptoms

There may be no symptoms. The condition usually causes chest pain behind the breastbone, which may spread to the neck or arms. The pain may be worse when you take a breath or swallow.

Signs and tests

During a physical examination, the doctor may feel small bubbles of air under the skin of the chest, arms, or neck. A chest x-ray or CT scan of the chest may be done to confirm that there is air in the mediastinum, and help diagnose a hole in the trachea or esophagus.

Treatment

Often, no treatment is needed because the body will gradually absorb the air. Breathing high concentrations of oxygen may speed up this process.

The doctor may put in a chest tube if you also have a collapsed lung (pneumothorax). Surgery is needed to repair a hole in the trachea or esophagus.

Expectations (prognosis)

The outlook depends on the disease or events that caused the pneumomediastinum.

Complications

The air may build up and enter the space around the lungs (pleural space), causing the lung to collapse.

More rarely, air may enter the area between the heart and the thin sac that surrounds the heart. This is called a pneumopericardium.

In other rare cases, so much air builds up in the middle of the chest that it pushes on the heart and the great blood vessels, making them unable to work properly.

All of these complications require urgent attention.

Calling your health care provider

Go to the emergency room or call the local emergency number (such as 911) if you have severe chest pain or difficulty breathing.

References

  1. Park DR, Vallieres E. Pneumomediastinum and mediastinitis. In: Mason RJ, Broaddus VC, Martin TR, et al, eds. Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2010: chap 77.
  2. Celli BR. Diseases of the diaphragm, chest wall, pleura, and mediastinum. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 99.

Review Date: 8/30/2012.

Reviewed by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

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The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only — they do not constitute endorsementscof those other sites. © 1997–2011 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Copyright © 2013, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics and subscribes to the principles of the Health on the Net Foundation (www.hon.ch).

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only — they do not constitute endorsementscof those other sites. © 1997–2011 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Copyright © 2013, A.D.A.M., Inc.

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