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Definition:

Pulmonary arteriovenous fistula is a condition in which an abnormal connection (fistula) develops between an artery and vein in the lungs. As a result, blood passes through the lungs without receiving enough oxygen.



Alternative Names:

Arteriovenous malformation - pulmonary



Causes, incidence, and risk factors:

Pulmonary arteriovenous fistulas are usually the result of a genetic disease that causes the blood vessels of the lung to develop abnormally. Fistulas also can be a complication of liver disease.

Patients with Rendu-Osler-Weber disease (ROWD) -- also called hereditary hemorrhagic telangiectasis (HHT) -- often have abnormal blood vessels in many parts of the body. These abnormal vessels can be in the lungs, brain, nasal passages, liver, and gastrointestinal organs. This condition is slightly more common in women than in men.



Symptoms:

Many people have no symptoms. When symptoms occur, they can include:

Other possible symptoms include:

  • A murmur heard with a stethoscope placed over the abnormal blood vessel
  • Abscesses or infections of the heart valves
  • Blue skin (cyanosis )
  • Clubbing of the fingers


Signs and tests:

Tests include:



Treatment:

A small number of patients who have no symptoms may not need specific treatment. For most patients with fistulas, the treatment of choice is to block the fistula during an arteriogram (embolization).

Some patients may need surgery to remove the abnormal vessels and nearby lung tissue.



Support Groups:



Expectations (prognosis):

The outlook for patients with HHT is not as good as for those without HHT. It is possible for the condition to come back after blocking the fistula (embolization).

Surgery to remove the abnormal vessels usually has a good outcome, and the condition is not likely to return.



Complications:

Major complications after treatment for this condition are unusual. Complications may include:

  • Bleeding in the lung
  • Blood clot that travels from the lungs to the arms, legs, or brain (paradoxical embolism)
  • Infection in the brain or heart valve


Calling your health care provider:

Call your health care provider if you often have nosebleeds or difficulty breathing, especially if you also have a history of HHT.



Prevention:

Because this condition is often genetic, prevention is not usually possible.



References:

Bernstein D. Other Congenital Heart and Vascular Malformations. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 432.




Review Date: 9/13/2008
Reviewed By: Benjamin Medoff, MD, Assistant Professor of Medicine, Harvard Medical School, Pulmonary and Critical Care Unit, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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 endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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