Extracardiac Fontan Procedure

What is Extracardiac Fontan Procedure?

The extracardiac Fontan procedure is an open-heart operation for children who were born with only one working pumping chamber in the heart. A normal heart has two pumping chambers, called ventricles. One sends blood to the lungs to pick up oxygen, and the other sends oxygen-rich blood to the rest of the body. In a single-ventricle heart, one of these chambers is too small or too weak to do its job, so oxygen-poor and oxygen-rich blood mix, and the child does not get enough oxygen.

The Fontan operation reroutes blood so that oxygen-poor blood returning from the body flows directly to the lungs without passing through the heart. In the extracardiac version, the surgeon uses a synthetic tube, called a conduit, placed outside the heart to connect the large vein from the lower body (the inferior vena cava) to the pulmonary artery, the vessel that carries blood to the lungs. “Extracardiac” simply means outside the heart. Older techniques created this pathway through a tunnel inside the heart itself.

The extracardiac Fontan procedure is usually the third and final stage in a series of operations for single-ventricle conditions. These conditions include hypoplastic left heart syndrome (an underdeveloped left side of the heart), tricuspid atresia (a missing or blocked valve between the right upper and lower chambers), double inlet left ventricle, some forms of pulmonary atresia, and other complex defects where the heart cannot be repaired into a normal two-pump circulation.

Who is a candidate: who needs extracardiac Fontan procedure

Understanding who needs extracardiac Fontan procedure starts with the staged approach used for single-ventricle heart disease. Most children first have a newborn operation, such as a Norwood procedure or a shunt, to balance blood flow. At around four to six months of age they usually have a second operation, called the Glenn procedure, which connects the vein from the upper body (the superior vena cava) to the pulmonary artery. The extracardiac Fontan completes the pathway, typically between about two and five years of age, although timing varies by child and by center.

A child may be considered a candidate when:

• They have a single functioning ventricle that cannot be surgically converted to a normal two-ventricle circulation.
• The earlier staged operations have been completed and the child has grown enough for the conduit to be placed.
• Pressure in the lung blood vessels is low enough for blood to flow into the lungs without a pump pushing it.
• The single ventricle squeezes reasonably well and the main heart valves are not leaking severely.
• The pulmonary arteries are large enough and free of significant narrowing.

The extracardiac Fontan procedure may not be suitable, or may need to be delayed, when the pressure in the lung vessels is too high, when the single ventricle is weak, when a heart valve leaks badly, or when the child has other serious medical problems. In some of these situations doctors may recommend additional procedures first, continued observation, or, in selected cases, discussion of heart transplantation instead. Every decision is individual and is usually made by a team that includes pediatric cardiologists, congenital heart surgeons, and anesthesiologists.

How the extracardiac Fontan procedure works

Knowing what happens during an extracardiac Fontan procedure procedure can make the experience less frightening for families. Below is a plain-language description of the usual sequence.

Before surgery

In the weeks before the operation the care team gathers detailed information about the heart. This often includes an echocardiogram (an ultrasound of the heart), cardiac catheterization (a thin tube passed through a blood vessel to measure pressures and take pictures), and sometimes cardiac MRI or CT scans. Blood tests, a chest X-ray, and an electrocardiogram (a recording of the heart’s electrical activity) are also common. These results confirm that the lung pressures and heart function are suitable for the Fontan circulation.

During surgery

The extracardiac Fontan procedure is performed under general anesthesia, meaning the child is fully asleep and feels nothing. The surgeon opens the chest through the breastbone, usually along the scar from earlier operations. In most cases a heart-lung bypass machine temporarily takes over the work of the heart and lungs, although some surgeons perform parts of the operation without stopping the heart.

The surgeon then:

• Detaches the inferior vena cava from the heart and closes the opening.
• Sews one end of a synthetic conduit to the inferior vena cava and the other end to the pulmonary artery.
• May create a small hole, called a fenestration, between the conduit and the heart. This acts as a pressure-release valve in the early recovery period and can often be closed later with a catheter procedure if it does not close on its own.
• Checks the connections, restarts the heart if bypass was used, and closes the chest.

The operation typically takes several hours. Time in the operating room also includes anesthesia, placement of monitoring lines, and preparation.

After surgery

The child is moved to a pediatric cardiac intensive care unit. They usually have a breathing tube for a period, chest drains to remove fluid, intravenous lines, and continuous heart monitoring. Once breathing and circulation are stable, the child moves to a regular cardiac ward for the remainder of the hospital stay.

Preparation for the extracardiac Fontan procedure

Preparation is guided by the surgical team, and instructions vary. Common elements include:

• Pre-admission testing: the imaging and blood tests described above, plus a review of current medications.
• Medication review: some medicines, especially blood thinners such as aspirin, may need to be adjusted or paused; families should follow the team’s specific instructions rather than stopping medicines on their own.
• Fasting: the child will need to stop eating and drinking for a set period before anesthesia. The team gives exact times.
• Infection check: surgery may be postponed if the child has a cold, fever, or other infection, because infection increases surgical risk.
• Dental health: good dental care matters for children with heart disease because mouth bacteria can travel to the heart; a dental check before surgery is sometimes recommended.
• Practical planning: families often need to arrange time off work, care for siblings, and accommodation near the hospital if traveling.

Age-appropriate explanation, familiar comfort objects, and a chance to see the hospital environment in advance can help reduce anxiety for the child.

Recovery and extracardiac Fontan procedure recovery time

Extracardiac Fontan procedure recovery time varies, and families should expect the timeline to be individual. In general terms:

• Intensive care: often a few days, depending on how quickly breathing support can be removed and how much fluid drains from the chest.
• Hospital stay: typically one to three weeks. The most common reason for a longer stay is prolonged drainage of fluid around the lungs (pleural effusion), which is a known feature of adapting to the new circulation.
• First weeks at home: many children are tired, have a reduced appetite, and need pain relief for the breastbone as it heals. Lifting the child under the arms is usually avoided for about six weeks to protect the healing bone.
• Return to normal activity: many children resume school and gentle play within about six to eight weeks, with contact sports and heavy exertion restricted until the surgeon clears them.

Aftercare usually includes:

• Medications such as aspirin or another blood thinner to reduce the risk of clots forming in the conduit, and sometimes diuretics (water tablets) to reduce fluid buildup.
• Wound care to keep the incision clean and dry, watching for redness or discharge.
• Follow-up visits with the cardiology team, often frequent at first and then at regular intervals for life.
• Attention to nutrition and hydration, because dehydration is poorly tolerated in a Fontan circulation.

Lifelong follow-up is a core part of care. The Fontan circulation is not a normal circulation, and monitoring helps detect problems early.

Extracardiac Fontan procedure risks and benefits

Weighing extracardiac Fontan procedure risks and benefits is a conversation each family should have with the surgical team, because the balance depends on the individual child.

Potential benefits

• Improved oxygen levels, because oxygen-poor blood no longer mixes with oxygen-rich blood.
• Reduced workload on the single ventricle, which no longer has to pump blood to both the lungs and the body.
• Better energy and exercise tolerance for many children compared with the earlier stages.
• Compared with older intracardiac techniques, the extracardiac approach may involve fewer stitches inside the heart, which some studies suggest is associated with fewer heart rhythm problems, although evidence continues to evolve.

Short-term risks

• Bleeding and the need for blood transfusion.
• Infection of the wound, chest, or bloodstream.
• Prolonged fluid drainage around the lungs or heart.
• Abnormal heart rhythms.
• Blood clots forming in the conduit or in the veins.
• Fluid buildup in the abdomen or elsewhere.
• Rarely, failure of the new circulation to work, which may require the surgeon to take the connection down or perform other emergency treatment.
• General risks of anesthesia and open-heart surgery, including a small risk of death.

Long-term risks

• Liver changes: higher pressure in the veins over years can affect the liver, so regular liver monitoring is standard.
• Protein-losing enteropathy: a condition in which protein leaks from the gut, causing swelling and low protein levels.
• Plastic bronchitis: a rare condition in which thick material forms in the airways.
• Heart rhythm disturbances and gradual weakening of the single ventricle.
• Conduit narrowing or growth mismatch: the synthetic tube does not grow with the child, so surgeons choose a size intended to last into adulthood; occasionally it needs to be enlarged or replaced.
• Reduced exercise capacity compared with peers, which is common even when the operation goes well.

Results and outlook

Since the Fontan operation was introduced in the early 1970s, survival for children with single-ventricle hearts has improved considerably, and the extracardiac technique is now one of the most widely used versions. Many children who have the procedure grow up to attend school, work, and live independent lives. At the same time, the Fontan circulation places long-term stress on the body, and a proportion of patients develop complications over decades. Doctors often describe the outcome as a palliation, meaning it improves the situation substantially without creating a normal heart.

Factors that generally influence outlook include the underlying heart defect, how well the single ventricle functions, the health of the heart valves, lung vessel pressures, and how closely the child is followed after surgery. Adults who had a Fontan as children are increasingly cared for in specialized adult congenital heart disease clinics. For some patients, heart transplantation becomes an option later in life if the circulation fails. Individual outcomes cannot be predicted with certainty, and families should discuss realistic expectations with their own team.

Cost considerations

The extracardiac Fontan procedure is a complex operation, and its overall cost is influenced by many factors rather than a single fee. Elements that typically drive the price include:

• Pre-operative testing, including catheterization and advanced imaging.
• Operating room time, the surgical and anesthesia team, and use of the heart-lung bypass machine.
• The synthetic conduit and any other implants or devices used.
• Length of stay in intensive care and on the ward, which can vary widely depending on fluid drainage and other recovery factors.
• Medications, blood products, and treatment of any complications.
• Follow-up visits, imaging, and possible later catheter procedures such as closing a fenestration.

Insurance coverage, national health systems, and hospital policies differ, so families are usually advised to request a detailed estimate from the treating institution. In hospital groups such as Acibadem, this type of surgery is managed within the Cardiovascular Surgery department in coordination with pediatric cardiology.

Frequently asked questions

What age is the extracardiac Fontan procedure usually done?

The extracardiac Fontan procedure is most often performed between about two and five years of age, after the earlier staged operations have been completed and the child has grown enough for an adult-sized conduit to be placed. Timing is individual, and the cardiology team decides based on the child’s size, oxygen levels, and test results.

How long is extracardiac Fontan procedure recovery time?

Hospital stays are typically one to three weeks, with the length often determined by how long chest drains are needed. Many children return to school and normal light activity within about six to eight weeks, with heavier activity restricted until the surgeon confirms the breastbone has healed. Recovery varies from child to child.

What are the main extracardiac Fontan procedure risks and benefits?

Benefits generally include higher oxygen levels, less strain on the single ventricle, and better energy. Risks include bleeding, infection, prolonged fluid drainage, rhythm problems, and blood clots in the short term, and liver changes, protein loss from the gut, and gradual heart weakening over the long term. The specific balance depends on the individual child.

Is the extracardiac Fontan procedure a cure?

No. The Fontan operation improves circulation and oxygen levels but does not create a normal heart. It is best described as a palliative procedure that allows many children to live active lives while requiring lifelong specialist follow-up.

What is the difference between extracardiac and lateral tunnel Fontan?

In the lateral tunnel technique, the surgeon builds a pathway inside the heart using a patch. In the extracardiac technique, a synthetic tube is placed outside the heart. Both achieve the same goal. Some evidence suggests the extracardiac approach may cause fewer rhythm problems because it involves fewer stitches inside the heart, but each center chooses based on the child’s anatomy and its own experience.

Will my child need medication for life after the procedure?

Many children take a blood thinner such as aspirin long term to reduce the risk of clots in the conduit. Other medicines, such as diuretics or heart medications, may be needed for a period or permanently depending on how the heart adapts. The cardiology team reviews medications at each follow-up.

Can children play sports after an extracardiac Fontan?

Many children can enjoy regular physical activity and moderate sport once healed, and staying active is generally encouraged. Exercise capacity is often lower than that of peers, and very intense or competitive endurance sport may be limited. Recommendations should come from the child’s own cardiologist.

When to see a doctor

Families of children with single-ventricle heart disease are already under specialist care, but there are situations where prompt review is important. Contact the cardiology team if a child shows worsening blue or gray color of the lips or skin, increasing tiredness or breathlessness during normal play, swelling of the face, belly, legs, or feet, poor appetite or unexplained weight gain from fluid, or persistent diarrhea, which can be a sign of protein loss from the gut.

After the operation, seek urgent medical attention if any of the following occur:

• Fever, or redness, swelling, warmth, or discharge from the incision.
• Rapid or difficult breathing, or breathing that is noticeably worse than the day before.
• Fainting, extreme drowsiness, or confusion.
• A racing, pounding, or irregular heartbeat that does not settle.
• Sudden swelling or pain in a leg or arm, which could indicate a blood clot.
• Coughing up thick, rubbery material, which may suggest plastic bronchitis.
• Vomiting or refusal to drink leading to signs of dehydration, such as very little urine or a dry mouth, since dehydration is poorly tolerated in a Fontan circulation.

Any sudden collapse, severe chest pain, or breathing difficulty should be treated as an emergency and needs immediate care from emergency services.