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Ebstein's anomaly

Ebstein's anomaly is a rare heart defect in which parts of the tricuspid valve are abnormal. The tricuspid valve separates the right lower heart chamber (right ventricle) from the right upper heart chamber (right atrium). In Ebstein's anomaly, the positioning of the tricuspid valve and how it functions to separate the 2 chambers is abnormal.

The condition is congenital, which means it is present at birth.

Causes

The tricuspid valve is normally made of three parts, called leaflets or flaps. The leaflets open to allow blood to move from the right atrium (top chamber) to the right ventricle (bottom chamber) while the heart relaxes. They close to prevent blood from moving from the right ventricle to the right atrium while the heart pumps.

In persons with Ebstein's anomaly, the leaflets are unusually deep in the right ventricle. The leaflets are often larger than normal. The defect usually causes the valve to work poorly, and blood may go the wrong way. Instead of flowing out to the lungs, the blood flows back into the right atrium. The backup of blood flow can lead to heart swelling and fluid buildup in the body. There may be narrowing of the valve that leads to the lungs (pulmonary valve).

In many cases, patients also have a hole in the wall separating the heart's two upper chambers and blood flow across this hole may cause oxygen-poor blood to go to the body. This can cause cyanosis, a blueish tint to the skin caused by oxygen-poor blood.

Ebstein's anomaly occurs as a baby develops in the womb. The exact cause is unknown, although the use of certain drugs (such as lithium or benzodiazepines) during pregnancy may play a role. The condition is rare. It is more common in white people.

Symptoms

Symptoms range from mild to very severe. Symptoms develop soon after birth, and include bluish-colored lips and nails due to low blood oxygen levels. In severe cases, the baby appears very sick and has trouble breathing. In mild cases, the affected person may be asymptomatic for many years.

Symptoms in older children may include:

  • Cough
  • Failure to grow
  • Fatigue
  • Rapid breathing
  • Shortness of breath
  • Very fast heartbeat

Exams and Tests

Newborns who have a severe leakage across the tricuspid valve will have very low levels of oxygen in their blood and significant heart swelling. The doctor may hear abnormal heart sounds, such as murmur, when listening to the chest with a stethoscope.

Tests that can help diagnose this condition include:

  • Chest x-ray
  • Magnetic resonance imaging (MRI) of the heart
  • Measurement of the electrical activity of the heart (EKG)
  • Ultrasound of the heart (echocardiogram)

Treatment

Treatment depends on the severity of the defect and the specific symptoms. Medical care may include:

  • Medications to help with heart failure
  • Oxygen and other breathing support
  • Surgery to correct the valve may be needed for children who continue to worsen or who have more serious complications

Outlook (Prognosis)

In general, the earlier symptoms develop, the more severe the disease.

Some patients may have either no symptoms or very mild symptoms. Others may worsen over time, developing blue coloring (cyanosis), heart failure, heart block, or dangerous heart rhythms.

Possible Complications

A severe leakage can lead to swelling of the heart and liver, and congestive heart failure.

Other complications may include:

  • Abnormal heart rhythms (arrhythmias), including abormally fast rhythms (tachyarrhythmias) and abnormally slow rhythms (bradyarrhythmias and heart block)
  • Blood clots from the heart to other parts of the body
  • Brain abscess

When to Contact a Medical Professional

Call your health care provider if your child develops symptoms of this condition. Get medical attention right away if breathing problems occur.

Prevention

There is no known prevention, other than talking with your doctor before a pregnancy if you are taking medicines that are thought to be related to developing this disease. You may be able to prevent some of the complications of the disease. For example, taking antibiotics before dental surgery may help prevent endocarditis.

Alternative Names

Ebstein's malformation

References

Bernstein D. Ebstein anomaly of the tricuspid valve. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 424.7.

Update Date: 2/17/2014

Updated by: Kurt R. Schumacher, MD, Pediatric Cardiology, University of Michigan Congenital Heart Center, Ann Arbor, MI. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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