Tricuspid atresia in children is a rare congenital heart defect that develops before birth. In this condition, the tricuspid valve does not form properly, preventing normal blood flow from the right atrium to the right ventricle. This can disrupt blood flow between the heart and lungs, with symptoms varying in severity from one child to another.Signs of the condition, such as blue or grayish skin or lips, difficulty breathing, fatigue during feeding, and poor weight gain, may appear during the first hours or days after birth in some cases. However, the severity of the condition depends on the structure of the heart and whether other congenital heart defects are present.In Dalili Medical, this article explores the symptoms and causes of tricuspid atresia, how it is diagnosed, its most important complications, and treatment options, including medications, catheter-based procedures, and surgery. It also answers an important question: Can a child with tricuspid atresia live a normal life after treatment?

What Is Tricuspid Atresia?

Tricuspid atresia is a congenital heart defect that occurs when the tricuspid valve does not develop normally. As a result, blood cannot pass normally from the right atrium to the right ventricle. This changes the normal pathway of blood flow through the heart and may reduce the amount of blood reaching the lungs, requiring evaluation and treatment by a specialized congenital heart disease team.

Is Tricuspid Atresia Dangerous?

Yes. Tricuspid atresia is considered a complex congenital heart defect that requires early diagnosis, appropriate treatment, and regular follow-up. The severity varies from one child to another depending on the heart's structure, the amount of blood reaching the lungs, and the presence of other heart defects, such as atrial or ventricular septal defects and transposition of the great arteries.

Can Tricuspid Atresia Be Detected Before Birth?

Yes. Some cases of tricuspid atresia can be detected during pregnancy using a fetal echocardiogram (fetal heart ultrasound). A doctor may suspect the condition during a routine ultrasound if abnormalities are seen in the structure of the heart or the blood flow through it. More detailed tests may then be performed to confirm the diagnosis.

Is Tricuspid Atresia the Same as Tricuspid Stenosis?

No. They are two different conditions.

• Tricuspid atresia: The tricuspid valve is absent or closed because it did not develop normally, preventing blood from flowing from the right atrium to the right ventricle.
• Tricuspid stenosis: The tricuspid valve is present but narrowed, which limits the amount of blood that can pass through it.

Can a Child With Tricuspid Atresia Survive?

Yes. A child with tricuspid atresia can survive into adulthood, especially with early diagnosis, appropriate treatment, and regular medical follow-up. The child's outlook depends on the structure of the heart, associated congenital defects, and the success of medical procedures and surgeries. Long-term follow-up with a specialist in congenital heart disease is usually necessary.

Can a Child Exercise After Treatment?

Some children may be able to participate in physical activities and appropriate sports after treatment, but the level of activity allowed varies from one child to another. It depends on heart function, surgical outcomes, heart rhythm, oxygen levels, and overall health. Therefore, the child's cardiologist should determine the appropriate type and intensity of physical activity.

Can Tricuspid Atresia Come Back After Surgery?

Tricuspid atresia does not return in the usual sense because the underlying problem is that the tricuspid valve did not develop normally before birth. However, problems or complications related to the single-ventricle circulation or previous procedures may develop after surgery. For this reason, continued medical follow-up remains important even after successful treatment.

Does a Child With Tricuspid Atresia Need Lifelong Follow-Up?

Yes. Most patients require long-term, and often lifelong, follow-up because tricuspid atresia is a complex congenital heart defect. Even after successful surgeries, regular follow-up helps doctors detect changes or complications at an early stage.

Follow-up may include assessment of:

• Heart function and its ability to pump blood.
• Heart rhythm and possible arrhythmias.
• The condition of the heart valves.
• Blood oxygen levels.
• The function of the ventricle responsible for pumping blood.
• The condition of the circulation after the Fontan procedure.
• Any late complications associated with the condition or previous surgeries.

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Can Tricuspid Atresia Affect a Child's Growth?

Yes. Tricuspid atresia may affect a child's growth and weight gain, particularly when the condition is associated with low oxygen levels, difficulty with feeding, or increased workload on the heart.

This may appear as slow weight gain or delayed growth compared with the expected rate for the child's age. After treatment, improvement in growth depends on heart function, oxygen levels, nutritional status, and the presence of any other health problems.

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Causes of Tricuspid Atresia

Tricuspid atresia is a congenital heart defect that develops while the fetal heart is forming. The tricuspid valve does not develop normally, preventing blood from passing from the right atrium to the right ventricle through the normal pathway.

In most cases, there is no single specific cause that can be identified. Instead, the condition is associated with an abnormality in heart development during the early stages of pregnancy.

1. Abnormal Heart Development During Pregnancy

The heart develops during the early stages of fetal growth through a complex series of processes involving the formation of the heart chambers, valves, and blood vessels.

In tricuspid atresia, the tricuspid valve does not form normally, and the normal pathway between the right atrium and right ventricle is closed rather than having an opening that allows blood to pass through.

2. Abnormal Development of the Right Ventricle

Tricuspid atresia is often associated with a small or underdeveloped right ventricle, because blood cannot reach it through the tricuspid valve in the normal way.

The degree of right ventricular underdevelopment varies from one child to another, and other structural abnormalities of the heart may also be present.

3. Associated Congenital Heart Defects

Tricuspid atresia may occur together with other congenital heart defects that help maintain blood flow between different parts of the heart and the circulation.

Associated defects may include:

• Atrial septal defect (ASD).
• Ventricular septal defect (VSD).
• Transposition of the great arteries (TGA).
• Narrowing or blockage of the pathway through which blood flows to the lungs or the pulmonary artery.
• Other abnormalities involving the major blood vessels.

The associated defects vary from one child to another, which is why the severity of the condition and the treatment plan can also differ.

4. Genetic and Hereditary Factors

Some congenital heart defects may be associated with genetic factors or genetic changes. However, a specific genetic cause cannot be identified in most cases of tricuspid atresia.

A genetic factor may be more likely when tricuspid atresia occurs as part of a syndrome or a broader congenital disorder.

5. Pregnancy-Related Factors

Certain factors during pregnancy may be associated with an increased risk of congenital heart defects in general. However, there is no single known factor that can be considered a direct and confirmed cause of tricuspid atresia in every case.

It is important to reassure parents that having a baby with tricuspid atresia does not mean that the mother did something wrong during pregnancy. In many cases, no specific cause can be identified, and the defect may result from a combination of factors during fetal development.

Symptoms of Tricuspid Atresia

The symptoms of tricuspid atresia vary from one child to another. Their severity mainly depends on the nature of the congenital defect, the presence of associated heart defects, and the amount of blood reaching the lungs. Signs may appear during the first hours or days after birth, while symptoms in some children may develop during the first few weeks of life.

1. Cyanosis

Cyanosis is one of the most prominent signs of tricuspid atresia and occurs when the oxygen level in the blood is low.

A blue or grayish color may appear on:

• The lips and tongue.
• The skin.
• The fingertips.

The severity of cyanosis varies depending on the degree of low oxygen levels and the associated heart defects.

2. Difficulty Breathing

The child may experience breathing problems, which can include:

• Rapid breathing.
• Increased effort when breathing.
• Faster breathing during feeding or crying.
• Pauses in breathing in severe cases.

3. Difficulty Feeding

An infant may have difficulty feeding because breathing and feeding require increased effort. Parents may notice that the baby:

• Becomes tired quickly while feeding.
• Stops frequently to catch their breath.
• Takes a long time to finish a feeding.
• Is unable to consume the usual amount of milk.

4. Poor Weight Gain and Growth

The condition may cause slow weight gain or poor growth, especially when feeding difficulties or low oxygen levels are present.

This may appear as:

• Slow weight gain.
• Failure to reach expected growth milestones for age.
• Becoming tired quickly while eating.
• Poor appetite or reduced food intake.

5. Rapid Heart Rate

The heart rate may increase, particularly when oxygen levels are low or during feeding, crying, or physical effort.

A rapid heart rate may also be related to an abnormal heart rhythm or increased strain on the circulatory system.

6. Fatigue and Lethargy

The child may appear:

• Less active than usual.
• Easily tired during feeding or movement.
• More likely to sleep.
• Lethargic or less responsive in severe cases.

Severe lethargy or a sudden change in the child's responsiveness requires urgent medical evaluation.

7. Cold Extremities or Poor Circulation

In severe cases, signs of reduced blood flow to body tissues may appear, such as:

• Cold hands and feet.
• Pale skin.
• Weak peripheral pulses.
• The body feeling colder than usual.

These signs depend on the severity of circulatory problems and the function of the heart.

8. Swelling

Swelling (edema) may occur in some cases, particularly when heart function is affected or complications involving the circulation develop. However, it is not a primary symptom that occurs in every child with tricuspid atresia.

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Symptoms of Tricuspid Atresia in Newborns

Symptoms of tricuspid atresia may appear shortly after birth, particularly as the baby's circulation changes from the fetal circulation to the normal circulation after birth.

Common signs that parents may notice include:

• Cyanosis.
• Rapid or difficult breathing.
• Difficulty feeding.
• Fatigue during feeding.
• Lethargy.
• Reduced responsiveness.
• Low blood oxygen levels.
• Poor weight gain when the condition persists over time.

The severity of symptoms varies from one baby to another depending on the amount of blood reaching the lungs, the presence of associated heart defects, and the function of the heart and circulatory system.

When Do Symptoms Require Urgent Evaluation?

If a newborn or infant develops marked or worsening blue discoloration, severe difficulty breathing, extreme lethargy, significant difficulty feeding, or reduced responsiveness, urgent medical evaluation is necessary. Tricuspid atresia can significantly affect oxygen levels and circulation.

When Is Tricuspid Atresia an Emergency?

If a newborn has marked cyanosis of the skin or lips, severe difficulty breathing, extreme lethargy, significant difficulty feeding, a clearly low oxygen level, or rapid deterioration in their overall condition, urgent medical evaluation is required.

Tricuspid atresia is a congenital heart defect that may require early specialized medical intervention, particularly when blood flow to the lungs is inadequate.

Diagnosis of Tricuspid Atresia

1. Diagnosing Tricuspid Atresia During Pregnancy

Tricuspid atresia may be detected during a fetal ultrasound examination, particularly when a detailed examination of the fetal heart is performed.

The doctor may identify signs such as:

• A small right ventricle.
• Abnormal development or absence of the tricuspid valve.
• Abnormal blood flow between the heart chambers.
• An atrial or ventricular septal defect.
• Abnormalities involving the great arteries or pulmonary artery.

Fetal Echocardiogram

A fetal echocardiogram is one of the most important tests when tricuspid atresia is suspected.

It helps evaluate:

• The heart chambers.
• The tricuspid valve.
• The size and function of both ventricles.
• The direction of blood flow.
• The great arteries.
• The pulmonary artery.
• The presence of associated congenital heart defects.

2. Diagnosing Tricuspid Atresia After Birth

Tricuspid atresia may be suspected when a newborn develops signs such as:

• Blue skin or lips.
• Difficulty breathing.
• Low oxygen levels.
• Difficulty feeding.
• Lethargy or reduced activity.

The doctor begins with a physical examination and measurement of oxygen saturation, followed by the necessary tests to evaluate the heart.

3. Measuring Oxygen Saturation

A pulse oximeter is used to measure the oxygen level in the blood.

Oxygen saturation may be low because of the nature of tricuspid atresia. However, oxygen measurement alone cannot confirm the diagnosis. It helps assess the baby's condition and determine whether further testing is needed.

4. Echocardiography

Echocardiography is the most important test for confirming tricuspid atresia and evaluating the structure of the heart and blood flow.

It can assess:

• The absence of a normal opening through the tricuspid valve.
• The size of the right ventricle.
• The size and function of the left ventricle.
• The presence of an atrial septal defect.
• The presence of a ventricular septal defect.
• The pathway of blood flow between the heart chambers.
• The amount of blood reaching the lungs.
• The condition of the pulmonary artery.
• The presence of transposition of the great arteries.
• Other congenital heart defects.

Echocardiography also helps determine the severity of the condition, the type of associated defects, and the most appropriate treatment plan.

5. Electrocardiogram (ECG)

An electrocardiogram (ECG) may be used to evaluate the heart's electrical activity and identify certain changes associated with the condition.

It may show findings consistent with a small right ventricle or increased workload on the left ventricle. An ECG can also help detect certain heart rhythm abnormalities when they are present.

However, an ECG alone cannot confirm a diagnosis of tricuspid atresia.

6. Chest X-Ray

A doctor may order a chest X-ray to help assess:

• The size and shape of the heart.
• The condition of the lungs.
• The amount of blood flow to the lungs indirectly.

The amount of blood reaching the lungs may be reduced or increased, depending on the specific anatomy of the defect and associated heart abnormalities.

7. Cardiac MRI or CT Scan

Some children may need a cardiac MRI or computed tomography (CT) scan to obtain more detailed anatomical information, particularly when the structure of the heart or blood vessels is complex.

These tests may help evaluate:

• The great arteries.
• Blood vessels.
• The pulmonary artery.
• The structure of the heart.
• Associated congenital heart defects.

Not every child with tricuspid atresia needs a CT scan or cardiac MRI.

8. Cardiac Catheterization

In some cases, a child may need cardiac catheterization to obtain detailed information about blood pressure within the heart chambers and blood vessels, or to evaluate the blood vessels before surgery or a catheter-based intervention.

Cardiac catheterization may also be used as a treatment, not just as a diagnostic procedure, depending on the child's cardiac anatomy and condition.

Medical Treatment for Tricuspid Atresia

1. Prostaglandin E1

Prostaglandin E1 (Alprostadil) is one of the most important medications that some newborns with tricuspid atresia may need, particularly when blood flow to the lungs or other parts of the circulation depends on the ductus arteriosus.

The medication helps keep the ductus arteriosus open temporarily, which may maintain blood flow to the lungs or the body, depending on the child's cardiac anatomy and condition.

It is usually given intravenously in the hospital under continuous medical monitoring and is not a medication to be used at home without medical supervision.

2. Medications for Heart Failure

If signs of heart failure develop, the cardiologist may prescribe appropriate medications depending on the child's condition and the underlying cause of heart failure.

Some children may be treated with diuretics to help reduce fluid retention and decrease the workload on the heart and lungs.

These medications are not required for every child with tricuspid atresia. The doctor determines whether they are needed based on the individual child's condition.

3. Medications for Heart Rhythm Disorders

If a child has an abnormal heart rhythm, they may require antiarrhythmic medications, depending on the type and severity of the rhythm disorder.

A pediatric cardiologist determines the appropriate medication and dosage based on:

• The child's age and weight.
• The type of heart rhythm disorder.
• Heart function.
• Oxygen levels.
• Other medications the child is taking.

4. Other Medications Depending on the Child's Condition

A child may need additional medications depending on associated heart defects, the stage of treatment, or complications that develop during follow-up.

Therefore, there is no single medication regimen that is appropriate for every child with tricuspid atresia.

Surgical Treatment and Procedures for Tricuspid Atresia

Tricuspid atresia is a congenital heart defect in which the tricuspid valve does not develop normally. As a result, there is no normal pathway for blood to flow from the right atrium to the right ventricle.

Because of this, treatment usually does not involve repairing the tricuspid valve itself. Instead, treatment aims to provide an appropriate pathway for blood to reach the lungs and the body while reducing the workload on the ventricle that performs the main pumping function.

The treatment plan varies from one child to another depending on the heart's anatomy, the size of the right ventricle, blood flow to the lungs, the condition of the pulmonary arteries, and associated heart defects such as a ventricular septal defect or transposition of the great arteries.

1. Keeping the Ductus Arteriosus Open After Birth

In some newborns, blood flow to the lungs or the body depends on the ductus arteriosus.

Prostaglandin E1 (PGE1) may be administered intravenously to help keep the ductus arteriosus open temporarily until the child can be fully evaluated and the appropriate intervention is determined.

This is not a surgical procedure, but it can be an important step in stabilizing the baby before catheterization or surgery.

2. Systemic-to-Pulmonary Shunt

If blood flow to the lungs is insufficient, the child may need a surgical procedure to create an additional pathway for blood to reach the lungs.

The surgeon creates a connection between one of the systemic arteries and the pulmonary artery, allowing blood to flow to the lungs.

This approach may be used as an initial stage of treatment in some cases. The choice depends on the child's cardiac anatomy and the amount of pulmonary blood flow.

3. Ductus Arteriosus Stent

PDA Stent

In some children with suitable cardiac anatomy, a stent may be placed inside the ductus arteriosus instead of performing a surgical shunt.

The procedure involves:

• Inserting a catheter through a blood vessel.
• Guiding the catheter to the ductus arteriosus.
• Placing the stent inside the ductus.
• Keeping the ductus open to allow continued blood flow to the lungs.

A pediatric interventional cardiologist determines whether this procedure is appropriate based on the child's cardiac anatomy and overall condition.

4. Improving Blood Flow to the Lungs

If there is narrowing or blockage in the pathway leading to the pulmonary artery, the child may need a catheter-based or surgical intervention to improve blood flow to the lungs.

Depending on the condition, options may include:

• Balloon dilation of the narrowed area.
• Placement of a stent in certain parts of the blood vessels when necessary.
• Surgery to create an appropriate pathway for blood flow to the lungs.

The most appropriate procedure is determined after a detailed assessment of the heart and blood vessels.

5. Bidirectional Glenn Shunt

The bidirectional Glenn procedure is an important stage of treatment for many children with tricuspid atresia.

During the procedure, the superior vena cava is connected to the pulmonary artery, allowing deoxygenated blood returning from the upper part of the body to flow more directly to the lungs without passing through the ventricle.

Goals of the Glenn Procedure

• Improve blood flow to the lungs.
• Reduce the workload on the main pumping ventricle.
• Prepare the circulation for the next stage of treatment.

The timing of the Glenn procedure varies from one child to another depending on their condition, cardiac anatomy, and the results of previous treatment.

6. Fontan Procedure

The Fontan procedure represents the final stage of treatment for many children with single-ventricle circulation, including many children with tricuspid atresia.

The procedure aims to direct venous blood returning from the lower part of the body to the pulmonary arteries so that the blood reaches the lungs without requiring the ventricle to pump it directly to the lungs.

Techniques used for the Fontan procedure include:

• Extracardiac conduit.
• Lateral tunnel.

The surgeon chooses the most appropriate technique based on the child's cardiac anatomy, age, previous surgeries, and the condition of the blood vessels.

7. Staged Treatment for Single-Ventricle Heart Disease

In tricuspid atresia, the right ventricle is often small and cannot perform its normal function fully. Therefore, treatment may rely on single-ventricle circulation.

The treatment plan may involve stages such as:

Stage 1:
Establish adequate blood flow to the lungs using a surgical shunt or, when appropriate, a ductal stent.

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Stage 2:
Bidirectional Glenn procedure.

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Stage 3:
Fontan procedure.

Not every child requires the same stages or the same timing. The treatment plan depends on the child's cardiac anatomy, overall condition, and response to treatment.

8. Treatment of Associated Heart Defects

Tricuspid atresia may occur with other defects that require intervention, such as:

• Ventricular septal defect.
• Narrowing or blockage of the pulmonary artery.
• Transposition of the great arteries.
• Abnormalities of the blood vessels.
• Other abnormalities affecting blood flow.

Some of these problems may be repaired or the blood-flow pathway may be modified during one of the staged surgical procedures, depending on the child's cardiac anatomy.

9. Catheter-Based Procedures After Surgery

A child may require catheter-based procedures during the treatment stages or during long-term follow-up.

These may include:

• Dilating a narrowed blood vessel.
• Placing a stent when necessary.
• Closing abnormal or unwanted connections between blood vessels.
• Measuring pressures within the heart and blood vessels.
• Performing interventions to improve blood flow.

The need for catheterization is determined based on the results of echocardiography, imaging studies, and other tests.

10. Heart Transplantation

In rare and severe cases, when heart function is inadequate or other surgical options are not sufficient, heart transplantation may be considered as a treatment option.

This decision is made by a specialized heart-transplant and congenital heart disease team after a comprehensive evaluation of the child's condition.