Preparing a Child for the Fontan Procedure: Tests, a Dental Check and the Hospital Stay

The appointment letter sits on the kitchen counter for three days before anyone opens it. Inside is a list: catheterization, echo, bloods, dental review, pre-admission clinic. Your two-year-old, meanwhile, is stacking blocks on the floor with the slightly blue fingertips you stopped noticing months ago. This is the strange arithmetic of a single-ventricle childhood: a child who looks mostly fine, and a calendar that says otherwise.

Preparing a child for Fontan surgery is less a single event than a season. Most families have already been through two operations and know the rhythm of the cardiac ward. What is different this time is the age. A toddler or preschooler notices needles, remembers hospital smells and asks questions that a newborn never could.

This explainer walks through what the tests are for, why a dentist is suddenly part of the heart team, what the hospital days tend to look like, and where the honest uncertainties lie. Every decision stays with your child’s cardiac team; the aim here is to make their words easier to follow.

What the Fontan procedure actually does inside the chest

In a typical heart, the right pumping chamber pushes oxygen-poor blood to the lungs and the left chamber pushes oxygen-rich blood to the body. A child born with a single functioning ventricle, one usable pumping chamber instead of two, cannot do both jobs at once. The Fontan is the surgical workaround for that missing pump.

The idea is elegant and slightly counterintuitive. Rather than build a second pump, the surgeon reroutes the large veins returning blood from the body so they connect straight to the lung arteries. Blood from the lungs then flows passively into the lungs, no ventricle required, powered by the small pressure difference between the veins and the lung vessels, plus the bellows action of breathing. The one good ventricle is freed up to do a single job: pumping oxygen-rich blood to the body.

This is usually the third stage of a sequence. The American Heart Association describes the staged approach for single-ventricle defects: a first operation in the newborn period, a second (often called the Glenn) in infancy that connects the upper-body vein to the lung arteries, and the Fontan that completes the circuit by connecting the lower-body vein as well.

Before the Fontan, oxygen-rich and oxygen-poor blood still mix, which is why saturations sit below normal and lips or nailbeds may look dusky. After it, the two streams are separated and oxygen levels typically rise into the low 90s, according to the AHA scientific statement on Fontan circulation. Higher does not mean identical to a two-ventricle heart, though. The Fontan circulation runs at a higher venous pressure and a lower cardiac output than normal, and most of the long-term care that follows exists because of that trade-off.

Who is usually a candidate for the Fontan procedure, and who is asked to wait

The AHA statement on Fontan circulation notes that the operation is typically performed between roughly 18 months and 4 years of age. That window is not arbitrary. The child needs to be big enough for the connections to be durable, yet the surgery should happen before prolonged low oxygen levels start to tax the single ventricle and the body.

Candidacy rests on three questions the team will try to answer with the pre-operative tests. Are the lung arteries wide enough and low enough in resistance for blood to flow through them without a pump? Is the single ventricle squeezing well and relaxing well, without a badly leaking valve? Is there any narrowing in the aorta or the earlier surgical connections that would need fixing at the same time?

A child is more likely to be asked to wait when:

• the pressure in the lung arteries is higher than the team would like, since passive flow depends on low resistance;
• the heart valve between the atrium and the ventricle leaks significantly, which may need repair first or at the same time;
• the ventricle’s pumping function has weakened, which the team may want to treat and re-evaluate;
• the child has recently been unwell, is smaller than expected for the surgery, or has another medical issue that needs settling.

Waiting is not the same as being turned down. In many cases the team uses the extra months for a catheter procedure to widen a vessel, a period of medication, or simply growth. In a smaller number of children, the tests show that the Fontan is not the right path, and the team will discuss alternatives such as continuing with the Glenn circulation or, rarely, transplant evaluation. Those conversations belong with the cardiologist and surgeon who know your child’s anatomy.

Preparing a child for Fontan surgery: the tests your team will order

Expect a cluster of investigations in the weeks before the operation. Each answers a different question, and knowing which is which makes the appointments less bewildering.

The echocardiogram is an ultrasound of the heart. It shows the ventricle’s squeeze, the valves and the earlier connections. Most children have had dozens; the trick at this age is distraction rather than sedation, though some centers still use a light sedative for a full study.

Cardiac catheterization is the test parents worry about most. A thin tube is threaded through a vein in the groin or neck up to the heart under anesthesia, and pressures are measured directly. The number the team cares about is the pressure in the lung arteries, because the Fontan only works if that pressure is low. The catheter can also inject dye to map the vessels and, if a narrowing is found, treat it with a balloon or a small stent in the same session. MedlinePlus describes catheterization as a standard part of planning pediatric heart surgery.

Cardiac MRI has become a common alternative or add-on. It measures how much blood the ventricle pumps, sizes the lung arteries and checks for collateral vessels, extra blood vessels that grow in low-oxygen states and can steal flow. An MRI in a toddler usually requires anesthesia to keep the child still.

Rounding out the list are an ECG (a tracing of the heart’s electrical rhythm), a chest X-ray, and blood tests that check clotting, kidney function, blood count and cross-match blood in case a transfusion is needed. Many teams also review vaccination records, since a planned operation is a poor time to be catching a preventable infection.

Why a dental check is part of getting ready for heart surgery

Parents are often surprised when the cardiology clinic asks about teeth. The reason is a condition called infective endocarditisan infection of the heart’s inner lining or of surgical material inside the heart. The American Heart Association lists people with certain congenital heart defects, including those with prosthetic material or previous repairs, among those at higher risk.

Bacteria from the mouth enter the bloodstream every day through inflamed gums or a decayed tooth. In most children, the immune system clears them without incident. In a child about to receive a synthetic tube stitched into the venous circulation, a mouthful of untreated decay is a genuine hazard, because bacteria can settle on the new material during the vulnerable weeks after surgery.

A pre-operative dental review therefore does two things. It identifies any cavities, abscesses or loose baby teeth that need treatment before the operation, ideally with enough time to heal. It also sets up the long-term habit the AHA emphasizes: meticulous daily brushing and regular dental visits, which matter more for lifelong endocarditis prevention than any single course of antibiotics.

Some children with Fontan circulation are advised to take antibiotics before certain dental procedures. Whether your child falls into that group, and what is prescribed, is a decision for the cardiologist working with the dentist; guidance has narrowed over the years to focus on the highest-risk groups, and the AHA page on endocarditis explains the current reasoning.

Practically, this means booking the dentist early. If a filling or extraction is needed, teams generally want the mouth healed well before the anesthetic date. A toddler who has never seen a dentist can find the first visit unnerving, so a short, no-treatment introductory appointment sometimes goes more smoothly than a full examination on day one.

The weeks before surgery: practical preparation for families

The pre-admission clinic, usually a week or two before the operation, is where the loose ends get tied. An anesthesiologist will ask about previous anesthetics, allergies, loose teeth and snoring. A nurse will explain the fasting instructions, which are strict for a reason: a full stomach under anesthesia risks inhaling stomach contents. Follow the exact clear-fluid and food cut-off times your team gives you rather than a general rule from the internet.

Illness in the run-up is the most common cause of postponement. A cold, a fever or a chest infection raises the risk of breathing complications after surgery and can push lung pressures up, which is exactly what the Fontan circulation cannot tolerate. Most teams ask families to call at the first sign of a runny nose or cough in the fortnight before admission so the decision to proceed can be made deliberately. Keeping the child away from busy indoor play areas in those weeks is a reasonable precaution rather than an overreaction.

Medications need a plan too. Some children with single-ventricle circulation take blood thinners, diuretics or heart medicines, and a few of these are paused or adjusted before an operation. Never stop or change anything on your own; ask the team to write down exactly what to give and when in the days before admission.

Then there is the ordinary logistics of a long hospital stay: who cares for siblings, what the parking and accommodation arrangements are, which comfort items travel with the child. A familiar blanket, a favorite cup and a tablet loaded with downloaded shows can do more for a toddler’s recovery than any amount of parental willpower. Photographs of home and a printed copy of the bedtime routine help nurses keep some normality when parents need to sleep.

How to explain heart surgery to a child of two, three or four

A toddler cannot understand the venous return, but they understand that something is about to happen to them and that the adults are tense. Child-life specialists, professionals trained in preparing children for medical care, consistently advise honesty scaled to age, given in small doses, close to the event.

For a two-year-old, that may be as simple as telling them the day before: the doctors are going to fix your special heart, you will have a sleep medicine so you feel nothing, and Mommy or Daddy will be there when you wake up. For a four-year-old, a few days’ notice and a story with pictures or a doll with a bandage on its chest lets them rehearse. Many hospitals lend play kits with real stethoscopes and syringes without needles for exactly this purpose.

Word choice matters more than parents expect. Avoid saying the doctors will put you to sleep, because some children have heard that phrase used about a pet. Try a special medicine that makes you have a deep sleep and then wakes you up. Avoid promising it won’t hurt; say instead that there will be medicine to help with any ouch, and that you will tell the nurses if they need more.

Children often worry about things adults do not anticipate: whether they did something wrong to cause this, whether their toys will still be at home, whether a sibling gets to go to preschool while they cannot. Naming those worries out loud, even guessing at them, tends to lower the temperature.

Expect regression. A recently toilet-trained child may need diapers again in hospital; a confident talker may go quiet. These are normal stress responses and usually pass within weeks of getting home.

Extracardiac conduit, lateral tunnel and the fenestration: what the surgeon chooses

Two main techniques complete the Fontan circulation, and your surgeon will explain which is planned for your child. The extracardiac conduit uses a synthetic tube, placed outside the heart, to connect the lower-body vein directly to the lung artery. The lateral tunnel routes that blood through a channel built inside the heart’s right atrium using a patch. Both achieve the same rerouting; the AHA statement on Fontan circulation notes that the extracardiac approach has become the more common choice in many centers, partly because it involves fewer stitches inside the atrium, which may matter for rhythm problems later.

The fenestration is a small deliberate hole between the new pathway and the heart. It sounds like a step backwards, surely the whole point was to separate the two blood streams? Its purpose is a pressure-relief valve. In the early weeks, when the lungs are adjusting to receiving all the body’s venous blood without a pump, the fenestration lets a little blood bypass the lungs if pressures climb. That lowers oxygen saturation slightly but reduces fluid buildup and supports the ventricle’s filling. Some fenestrations close on their own; others are closed later by catheter, and some are left open long term. Whether to create one is a judgment your surgical team makes based on the pre-operative pressures.

Feature	Extracardiac conduit	Lateral tunnel
Where the pathway sits	Outside the heart, synthetic tube	Inside the right atrium, patch-built channel
Growth potential	Fixed tube size, so timing and sizing matter	Some potential to grow with the child
Rhythm considerations	Fewer stitch lines inside the atrium	More atrial suture lines
Fenestration possible	Yes	Yes

Neither technique is universally better; the choice reflects anatomy, surgeon experience and the child’s earlier operations.

What happens on the day of Fontan surgery

Admission is often the evening before or early on the morning of surgery. Nurses will check weight, temperature and oxygen saturation, confirm the fasting times and place an identification band. Many units allow a parent to accompany the child to the anesthetic room and stay until the child is asleep, which most children find calming and most parents find harder than expected.

Once the child is under anesthesia, the team places a breathing tube, intravenous lines and monitoring catheters. The operation itself is done through the same midline chest incision used for the earlier surgeries, so the surgeon must first work through scar tissue, one reason third-stage operations take longer to begin than the anatomy alone would suggest. Most Fontan operations use a heart-lung bypass machine, which takes over the work of the heart and lungs while the connections are made. MedlinePlus explains that open-heart surgery in children usually means bypass, with the surgery itself commonly lasting several hours.

Families typically receive updates from a nurse or coordinator during the wait. When the connections are complete and the bypass is weaned, the surgeon checks pressures directly in the operating room, decides on the fenestration if not already planned, places chest drains and often temporary pacing wires, and closes the chest. Occasionally, if swelling makes closure risky, the sternum is left open under a sterile dressing for a day or two and closed once the child has settled; this is planned caution, not a sign that something went wrong.

The child then moves to the pediatric cardiac intensive care unit still asleep, with the breathing tube in place. Seeing them for the first time surrounded by monitors and lines is a jolt, even for families who have done this twice before. Ask the nurse to walk you through each line and what it is for; the unknown is usually the frightening part.

How long is the hospital stay after Fontan, and what do the first days look like?

MedlinePlus notes that children who have open-heart surgery usually spend the first days in intensive care before moving to a general ward, with total stays that vary widely with the operation and the child. For the Fontan specifically, the AHA statement describes a typical course of one to two weeks, with a meaningful minority staying longer because of fluid drainage around the lungs.

The first 24 to 48 hours are about stability. The breathing tube usually comes out within the first day if oxygen levels and blood pressure allow, because breathing on one’s own actually helps the Fontan circulation: the negative pressure of each breath pulls blood into the lungs. Pain is controlled with a combination of medicines chosen by the intensive care team, and children are often sleepier than parents expect for a day or two.

Chest drains are the feature that defines the Fontan recovery. Because venous pressure is now higher throughout the body, fluid tends to weep into the space around the lungs: a pleural effusion, meaning fluid collecting between the lung and the chest wall. The drains remove it. Nurses measure the output each shift, and the drains come out only when it has slowed to a trickle for a sustained period. Some children are drain-free within days; others need them for two or three weeks. Diuretics, medicines that help the kidneys remove fluid, and a period of restricted fluid intake are common tools during this phase.

Once drains are out and the child is eating, walking to the playroom and off intravenous medicines, discharge planning starts. Before going home, families are taught wound care, medication timing, and what oxygen saturation range the team expects if a home monitor is being used. Ask for these instructions in writing.

Fontan recovery time at home: what the following weeks usually hold

The first fortnight at home is quieter than parents fear and slower than children want. Appetite returns before energy does. Naps lengthen. A child who was climbing furniture before surgery may want to be carried for a week, then suddenly refuse to be carried at all.

The breastbone, cut and wired during surgery, needs time to knit. MedlinePlus advises that children avoid activities that strain the chest, being lifted under the arms, roughhousing, climbing, for several weeks after open-heart surgery, and most cardiac teams give a specific timeline of roughly six to eight weeks before unrestricted play. Lift a toddler by scooping under the bottom and behind the back rather than under the armpits. Car seats and strollers are fine; contact sports for an older child are not until the team clears them.

The wound should be kept clean and dry as instructed, with baths usually allowed once the team confirms the incision has sealed. A little redness at the edges is normal; spreading redness, oozing or a gap in the wound is not, and belongs in the red-flag section below.

Fluid can reaccumulate around the lungs even after drains are out, which is why the first follow-up appointment often falls within a week or two of discharge and includes a chest X-ray or echo. Weight is checked closely; a sudden gain can mean fluid rather than growth.

Oxygen saturations will be higher than before, but if a fenestration was created they will not be fully normal, and that is expected. Return to daycare or preschool is typically discussed at the first follow-up; many teams suggest waiting until the chest has healed and the winter virus season is considered, since respiratory infections are harder on a Fontan circulation than on a two-ventricle one.

Medicines after the Fontan, explained by class rather than by name

Parents leave hospital with a schedule that can feel like a second job. Understanding what each medicine class is for makes the routine easier to keep and the questions easier to ask.

Blood thinners come first in most conversations. The Fontan pathway is a slow-flowing venous channel made partly of synthetic material, and slow flow across foreign material encourages clots. The AHA statement discusses two broad approaches: antiplatelet drugs, which make platelets less sticky, and anticoagulants, which slow the clotting cascade itself. Which one, for how long, and whether monitoring blood tests are needed depends on the child’s anatomy, the presence of a fenestration and the center’s protocol. The prescribing cardiologist owns that decision, and it is one of the questions worth asking directly.

Diuretics are usually a bridge rather than a permanent fixture. They help the kidneys shed the extra fluid that accumulates in the early weeks and are often tapered off over the following months as the lungs adjust to the new circulation.

Some children take medicines aimed at the heart muscle itself, classes that lower the workload on the single ventricle or help it relax between beats. The evidence for routine use in Fontan patients is mixed, and the AHA statement is candid that many practices rest on extrapolation from adult heart failure rather than pediatric trials. If your child is prescribed one, it is reasonable to ask what specific finding prompted it.

Finally, some children are given a medicine class that relaxes the lung blood vessels, used when lung pressures are on the high side. Again, the data are evolving, and the team’s reasoning matters more than the drug’s name.

Whatever the list, keep it current and carry it to every appointment, including the dentist.

Fontan procedure risks and the honest long-term picture

Ask any single-ventricle family the question they have typed into a search bar at two in the morning and it is some version of: how long will my child live? The honest answer is that the field has changed faster than the statistics can follow. The AHA statement on Fontan circulation estimates that tens of thousands of people are now living with this circulation worldwide, most of them children and young adults, and that the majority of children who complete the Fontan today reach adulthood. Any single survival percentage you read online is drawn from children operated on decades ago with older techniques, and your team can put your child’s specific situation in context better than a population figure can.

Short-term risks in and around the operation include bleeding, infection, abnormal heart rhythms, prolonged fluid drainage, clots, and, uncommonly, a circulation that does not tolerate the new arrangement and needs to be revised or fenestrated. Anesthesia carries its own small risks, which the anesthesiologist will discuss.

Long-term, the higher venous pressure of the Fontan circulation gradually affects other organs. The AHA statement describes the main concerns:

• liver changes from chronic congestion, which is why routine liver surveillance is now standard;
• protein-losing enteropathy, a condition in which protein leaks from the gut, causing swelling and low blood protein;
• plastic bronchitis, in which rubbery casts form in the airways and cause cough or breathlessness;
• rhythm disturbances, more often with older surgical techniques;
• gradual decline in exercise capacity and, in some, weakening of the single ventricle.

None of these is inevitable, and the entire rationale for lifelong follow-up in a specialist congenital heart program is to catch them early. Framed honestly: the Fontan is not a repair that restores a normal heart. It is a durable, imperfect circulation that lets a child grow up, and it asks for vigilance in return.

What people often get wrong about preparing for the Fontan

The Fontan is the last operation. It is the last planned stage, which is different. Some children later need catheter procedures to close a fenestration or widen a vessel, a pacemaker for rhythm problems, or revision surgery years down the line. Framing it as the finish line sets families up for a harder landing when follow-up finds something.

Blue lips will vanish overnight. Saturations usually rise noticeably, but a fenestration keeps them below normal on purpose, and lingering cyanosis in the first weeks is expected rather than alarming. The AHA statement notes that saturations after a fenestrated Fontan commonly sit a few points lower than after a non-fenestrated one.

A longer hospital stay means the surgery went badly. Prolonged chest drainage is the single most common reason for a longer stay and reflects how the lungs are adjusting, not surgical error. Two children with identical operations can go home ten days apart.

Teeth are a side issue. The dental check is part of the surgical work-up precisely because oral bacteria are a leading route to endocarditis in children with heart surgery, as the AHA endocarditis guidance explains. Skipping it can delay the operation.

The child is too young to be told. Even two-year-olds sense preparation and benefit from simple, truthful framing on the day. Silence tends to be filled with a child’s imagination, which is rarely kinder than the facts.

Once home, life goes back to how it was. Activity restrictions, fluid and medication routines and frequent early appointments are part of recovery. Most families describe a new normal settling in over two to three months rather than a return to the old one within days.

Exercise should be avoided for life. The opposite is closer to the evidence: the AHA statement encourages regular physical activity in Fontan patients within limits their team sets, because muscle pump and breathing help drive the passive circulation.

Questions to ask your care team before Fontan surgery

Consultations move quickly and parents often remember the question they meant to ask in the parking lot. Taking a written list is not overbearing; surgeons expect it. These are the questions single-ventricle families most often say they wished they had asked earlier.

• Which Fontan technique are you planning for my child, and why that one for this anatomy?
• Will you create a fenestration? If so, what is the plan for closing it later, and how will that decision be made?
• What did the catheterization show about lung pressures, and how close is that to the limit you would accept?
• Are there any other repairs planned in the same operation: a valve, the aortic arch, a narrowed vessel?
• How long do you expect the operation itself to take, and how will we receive updates?
• What is your unit’s typical range for chest drain duration and total stay, and what tends to lengthen it?
• Which blood thinner class will my child take afterwards, for how long, and does it need blood-test monitoring?
• What activity restrictions apply after discharge, for how many weeks, and what exactly counts as too much?
• Does my child need antibiotics before future dental work, and who decides?
• What oxygen saturation range should I expect at home, and at what number do you want a call?
• When is the first follow-up, and what will it include?
• How will liver, growth and exercise capacity be monitored in the years ahead?
• Who do I call out of hours, and what is the direct number?

A final question that is easy to skip: what would make you postpone? Knowing the team’s own thresholds, a cold, a fever, a change on the echo, turns a last-minute cancellation from a shock into an anticipated possibility. Write the answers down, or ask whether the conversation can be summarized in a letter you can reread at home.

When to call your doctor after Fontan surgery

Most bumps in the first weeks at home are minor, but a Fontan circulation has less reserve than a normal one, so the threshold for picking up the phone should be low. Your team will give you their own list; this one reflects the red flags emphasized in MedlinePlus and AHA guidance on recovery from pediatric heart surgery.

Call your cardiac team the same day if you notice:

• fever, or a wound that is increasingly red, warm, swollen, oozing or beginning to gape;
• oxygen saturations consistently below the range the team gave you, or a child who looks bluer than usual, especially around the lips;
• breathing that is faster or more effortful than normal, a persistent new cough, or grunting;
• a puffy face, swollen belly or legs, or a weight jump over a day or two that suggests fluid rather than growth;
• refusal of fluids, very few wet diapers, or repeated vomiting that means medicines are not being kept down;
• unusual sleepiness, irritability that cannot be settled, or a child who is simply not themselves in a way that worries you.

Seek emergency care immediately, call emergency services, for a child who is struggling to breathe, whose lips or face turn dark blue or grey, who collapses or is very difficult to rouse, who has a seizure, who develops sudden one-sided weakness or facial droop, or who has bleeding that will not stop with firm pressure. A child on blood thinners who has a significant head bump also needs urgent assessment, even if they seem fine at first.

Trust the instinct that comes from knowing your child. The teams who look after single-ventricle children say it often: the parent who calls too early is never the problem, and every decision about what to do next belongs with the clinicians who know your child’s heart.

Frequently asked questions

What is the ideal fontan procedure age?

The AHA scientific statement on Fontan circulation describes the operation as typically performed between about 18 months and 4 years of age. Within that window, timing depends on the child’s size, lung artery pressures and ventricle function measured on pre-operative tests, and on whether earlier connections need adjustment. There is no single ideal birthday; the team chooses a point where the child is large enough for durable connections but before prolonged low oxygen levels strain the heart.

What is the long-term survival rate for people with Fontan surgery?

There is no single figure that applies to a child operated on today. The AHA statement notes that most children who complete the Fontan with modern techniques now reach adulthood and that tens of thousands of people worldwide are living with this circulation. Published percentages mostly come from children operated on decades ago with older methods. Your cardiologist can put your child’s specific anatomy and test results into context far better than a population statistic.

What are the main fontan procedure risks?

Short-term risks include bleeding, infection, abnormal heart rhythms, blood clots and prolonged fluid drainage around the lungs, with a small number of children needing early revision. Long-term, the AHA statement describes liver changes from chronic venous congestion, protein-losing enteropathy, plastic bronchitis, rhythm problems and gradual decline in exercise capacity. None is inevitable, and lifelong specialist follow-up exists to detect these early and manage them.

How long does it take for a child to recover from open-heart surgery like the Fontan?

MedlinePlus describes a hospital course of several days in intensive care followed by time on a ward, and the AHA statement notes a typical Fontan stay of one to two weeks, longer if chest drains stay in. At home, energy usually returns over a few weeks, while the breastbone takes roughly six to eight weeks to heal, during which lifting under the arms and rough play are avoided. Full return to normal routines commonly takes two to three months.

How should I explain heart surgery to a child who is a toddler?

Keep it short, truthful and close to the day. Tell them the doctors will fix their special heart, they will have a sleep medicine so they feel nothing, and you will be there when they wake. Avoid the phrase put to sleep and avoid promising no pain; say there will be medicine for any ouch. Play with a doll or toy medical kit lets a three- or four-year-old rehearse, and child-life specialists can help tailor the words.

Why does my child need a dental check before Fontan surgery?

Untreated decay or gum inflammation lets mouth bacteria into the bloodstream, where they can settle on the synthetic material placed during the Fontan and cause infective endocarditis. The AHA lists children with congenital heart disease and surgical material among those at higher risk. Treating dental problems before surgery, with time for healing, removes an avoidable infection source. Your cardiologist and dentist will also decide whether antibiotics are advised before future dental work.

What is a fenestration and why would the surgeon leave a hole in the repair?

A fenestration is a small deliberate opening between the new Fontan pathway and the heart. It acts as a pressure-relief valve while the lungs adjust to receiving all the body’s venous blood without a pump. Blood bypassing the lungs lowers oxygen saturation slightly but reduces fluid buildup and supports the ventricle. Some fenestrations close on their own, some are closed later by catheter, and the decision to create one rests on pre-operative pressures.

Why do some children stay in hospital much longer after the Fontan?

The most common reason is prolonged pleural effusion, fluid collecting around the lungs because venous pressure is now higher throughout the body. Chest drains stay in until the output slows for a sustained period, which can take days in some children and two or three weeks in others. Rhythm disturbances, feeding difficulties or a slow adjustment of lung pressures can also extend the stay. A longer stay reflects the lungs adapting, not a failed operation.

What is fontan recovery time for returning to daycare or preschool?

Most teams discuss this at the first follow-up, usually within a week or two of discharge. They generally want the chest incision healed and the breastbone well on its way to knitting, which takes roughly six to eight weeks, and some prefer to wait out peak respiratory virus periods because chest infections are harder on a Fontan circulation. Your cardiologist will set the date based on your child’s recovery and the local situation.

Can a child with a Fontan circulation exercise and play sports later?

Yes, within limits set by the care team. The AHA statement encourages regular physical activity for people with Fontan circulation because muscle contraction and deep breathing help drive blood through the passive lung circuit. Restrictions after surgery are temporary while the chest heals. Later, most children can join everyday play and many sports, though the team may advise caution with high-intensity or contact activities, especially if a child takes blood thinners.

References

• MedlinePlus: Pediatric Heart Surgery
• MedlinePlus: Hypoplastic Left Heart Syndrome
• NHS: Congenital Heart Disease: Treatment

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.