Tricuspid atresia

Tricuspid atresia is a type of heart disease that is present at birth ( congenital heart disease ), in which the tricuspid heart valve is missing or abnormally developed. The defect blocks blood flow from the right atrium to the right ventricle.

Congenital heart disease

Congenital heart disease (CHD) is a problem with the heart's structure and function that is present at birth.

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Causes

Tricuspid atresia is an uncommon form of congenital heart disease. It affects about 5 in every 100,000 live births. One in 5 people with this condition will also have other heart problems.

Normally, blood flows from the body into the right atrium, then through the tricuspid valve to the right ventricle and on to the lungs. If the tricuspid valve does not open, the blood cannot flow from the right atrium to the right ventricle. Because of the problem with the tricuspid valve, blood ultimately cannot enter the lungs. This is where it must go to pick up oxygen (becomes oxygenated).

Instead, the blood passes through a hole between the right and left atrium. In the left atrium, it mixes with oxygenated blood returning from the lungs. This mix of oxygenated and de-oxygenated blood is then pumped out into the body. This causes oxygen level in the blood to be lower than normal.

The lungs receive blood either through a hole between the right and left ventricles, or through a fetal vessel called the ductus arteriosus that connects the pulmonary artery (artery to the lungs) to the aorta (main artery to the body). The ductus arteriosus is present when a baby is born, but closes by itself shortly after birth.

Symptoms

Symptoms include:

• Bluish color to the skin

  Bluish color to the skin

  Cyanosis is a bluish color to the skin or mucous membrane that is usually due to a lack of oxygen in the blood.

  

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• Fast breathing
• Fatigue
• Poor growth
• Shortness of breath

Exams and Tests

This condition may be discovered during routine prenatal ultrasound imaging or when the baby is examined after birth. Bluish skin is present at birth. A heart murmur is often present at birth and may increase in loudness over several months.

Prenatal ultrasound

A pregnancy ultrasound is an imaging test that uses sound waves to create a picture of how a baby is developing in the womb. It is also used to chec...

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Tests may include the following:

• ECG

  ECG

  An electrocardiogram (ECG) is a test that records the electrical activity of the heart.

  

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• Echocardiogram

  Echocardiogram

  An echocardiogram is a test that uses sound waves to create pictures of the heart. The picture and information it produces is more detailed than a s...

  

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• Chest x-ray

  Chest x-ray

  A chest x-ray is an x-ray of the chest, lungs, heart, large arteries, ribs, and diaphragm.

  

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• Cardiac catheterization

  Cardiac catheterization

  Cardiac catheterization involves passing a thin flexible tube (catheter) into the right or left side of the heart. The catheter is most often insert...

  

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• MRI of the heart

  MRI of the heart

  Heart magnetic resonance imaging is an imaging method that uses powerful magnets and radio waves to create pictures of the heart. It does not use ra...

  

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Treatment

Once the diagnosis is made, the baby will often be admitted to the neonatal intensive care unit (NICU). A medicine called prostaglandin E1 may be used to keep the ductus arteriosis open so that blood can circulate to the lungs.

The condition always requires surgery. If the heart is unable to pump enough blood out to the lungs and rest of the body, the first surgery most often takes place within the first few days of life. In this procedure, an artificial shunt is inserted to keep blood flowing to the lungs. In some cases, this first surgery is not needed.

Afterward, the baby goes home in most cases. The child will need to take one or more daily medicines and be closely followed by a pediatric cardiologist. This doctor will decide when the second stage of surgery should be done.

The next stage of surgery is called the Glenn shunt or hemi-Fontan procedure. This procedure connects half of the veins carrying blue blood from the upper half of the body directly to the pulmonary artery. The surgery is most often done when the child is between 4 to 6 months old.

During stage I and II, the child may still look blue (cyanotic).

Stage III, the final step, is called the Fontan procedure. The rest of the veins carrying blue blood from the body are connected directly to the pulmonary artery leading to the lungs. The left ventricle now only has to pump to the body, not the lungs. This surgery is usually performed when the child is 18 months to 3 years old. After this final step, the baby is no longer blue.

Outlook (Prognosis)

In most cases, surgery will improve the condition.

Possible Complications

Complications may include:

• Irregular, fast heart rhythms (arrhythmias)
• Chronic diarrhea (from a disease called protein-losing enteropathy)
• Heart failure

  Heart failure

  Heart failure is a condition in which the heart is no longer able to pump oxygen-rich blood to the rest of the body efficiently. This causes symptom...

  

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• Fluid in the abdomen (ascites) and in the lungs (pleural effusion)
• Blockage of the artificial shunt
• Strokes and other nervous system complications
• Sudden death

When to Contact a Medical Professional

Contact your health care provider right away if your infant has:

• New changes in breathing patterns
• Problems eating
• Skin that is turning blue

Prevention

There is no known way to prevent tricuspid atresia.