ASD Surgical Closure

Introduction

If your child — or you — has been diagnosed with an atrial septal defect (ASD) and surgery has been suggested, you are likely trying to understand what the operation actually involves, why it is being recommended now, and what life looks like afterwards. This article is written for that moment. It walks through what ASD surgical closure is, who needs it, how it is done, what recovery feels like week by week, and what the long-term outlook tends to be.

ASD surgical closure has been performed for decades and is one of the most established operations in congenital heart surgery. While the words “open-heart surgery” can feel frightening — especially when the patient is a child — the procedure is well understood, carefully planned, and carries a very strong safety record at experienced centres. Understanding what is going to happen often makes the path feel less overwhelming.

What Is ASD Surgical Closure?

An atrial septal defect, or ASD, is a hole in the thin wall (called the septum) that separates the two upper chambers of the heart — the right and left atria. In a healthy heart, this wall keeps oxygen-rich blood (returning from the lungs to the left side) separate from oxygen-poor blood (returning from the body to the right side). When there is a hole, some of the oxygen-rich blood leaks from the left atrium back into the right atrium. This extra blood then travels again through the right side of the heart and the lungs, making both work harder than they should.

ASD surgical closure is an open-heart operation to permanently close that hole. The surgeon either stitches the edges of a small hole directly together or sews a patch — made of synthetic material such as Dacron or PTFE, or from a piece of the patient’s own pericardium (the sac around the heart) — over a larger defect. After closure, blood once again flows in the normal direction, and the right side of the heart and the lungs gradually return to a more normal workload.

Types of ASD

• Ostium secundum ASD — the most common type, sitting in the middle part of the septum. Many of these can be closed with a catheter-based device rather than surgery, but larger or awkwardly placed secundum defects still need surgical repair.
• Ostium primum ASD — lower in the septum, often associated with abnormalities of the heart valves. These almost always require surgical repair.
• Sinus venosus ASD — near where the large veins (superior or inferior vena cava) enter the right atrium. Often associated with abnormal pulmonary vein drainage. Surgical repair is the standard approach.
• Coronary sinus ASD — a rare type involving the coronary sinus. Treated surgically.

The first step in planning closure is identifying which type of ASD is present, usually with an echocardiogram and sometimes additional imaging. The defect’s type, size, and surrounding anatomy determine whether catheter device closure is an option or whether surgical closure is needed.

Why Is ASD Surgical Closure Performed?

Not every ASD needs to be closed. Small holes in infants often shrink and close on their own during the first one to two years of life. When closure is considered, it is because the defect is unlikely to close by itself and is large enough to cause measurable strain on the heart and lungs.

The American Heart Association and American College of Cardiology (AHA/ACC) guidelines and the European Society of Cardiology (ESC) guidelines for adult congenital heart disease describe closure as appropriate when there is significant left-to-right shunting (the abnormal blood flow through the hole), enlargement of the right side of the heart, or symptoms attributable to the defect. The same general principles apply in children, where paediatric cardiologists time the closure to prevent long-term complications.

Reasons doctors typically recommend closing an ASD include:

• The hole is moderate or large in size
• The right atrium and right ventricle are enlarged on echocardiogram
• There are symptoms such as breathlessness, fatigue, poor growth in a child, or palpitations
• Early signs of pulmonary hypertension (raised pressure in the lung blood vessels) are appearing
• The patient has had a stroke or transient ischaemic attack thought to be related to the ASD (a so-called paradoxical embolism)

If a moderate or large ASD is left untreated through adulthood, problems that can develop over time include pulmonary hypertension, atrial arrhythmias (irregular heart rhythms such as atrial fibrillation), right-sided heart failure, and increased risk of stroke. Closing the defect at the right time substantially reduces these risks.

Why Surgery Rather Than a Catheter Device?

However, device closure is not suitable for every ASD. Surgical closure remains the established approach in situations such as:

• Primum, sinus venosus, or coronary sinus ASDs — these types are not anatomically suited to a device and are repaired surgically
• Very large secundum defects where the surrounding tissue rims are inadequate to anchor a device safely
• ASDs with associated heart problems — for example, abnormal pulmonary venous drainage, valve abnormalities, or other congenital defects that themselves need surgical repair at the same time
• Failed device closure or device-related complications requiring removal

The decision between device and surgical closure is made after careful imaging, usually including transthoracic echocardiography and sometimes transoesophageal echocardiography (an ultrasound from inside the food pipe, giving a clearer view of the septum). The choice is individual and depends on the anatomy of the defect.

Who Is a Candidate for Surgery?

Candidates for ASD surgical closure include children whose defect has not closed on its own and is causing heart enlargement or symptoms, and adults whose ASD was either missed in childhood or has only recently begun to cause problems.

In children, common signs that lead to evaluation include:

• A heart murmur picked up on routine examination
• Poor weight gain or slow growth
• Recurrent chest infections or breathing problems
• Tiring easily during play or feeds

In adults, an ASD may come to light because of:

• Shortness of breath on exertion
• Reduced exercise tolerance
• Palpitations or atrial fibrillation
• An unexplained stroke at a younger age than expected
• Incidental detection on an echocardiogram done for another reason

Once the anatomy has been clarified, the surgical team, cardiologist, and family discuss the timing of the operation. In children, repair is often planned in the preschool years if the defect is significant, although timing can vary. In adults, repair is generally offered as soon as the indication is confirmed, before complications such as pulmonary hypertension become advanced.

Surgical closure is generally not offered when severe, fixed pulmonary hypertension has already developed, because at that stage closing the defect can worsen the situation. This is why early evaluation matters.

Surgical Approaches

The traditional and most common approach to ASD surgical closure is through a median sternotomy — a vertical incision in the centre of the chest, splitting the breastbone. This gives the surgeon excellent access to the heart and is the standard for paediatric ASD repair worldwide. The scar runs down the middle of the chest and fades significantly over time, especially in children.

Where anatomy allows and the centre has the expertise, alternative approaches may be offered:

• Mini-sternotomy — a smaller, partial incision of the breastbone
• Right anterolateral thoracotomy — an incision on the side of the chest, sometimes used in older children and adults, with cosmetic advantages particularly for girls and women as the scar can be hidden under the breast
• Minimally invasive or robot-assisted approaches in selected adult patients at specialised centres

The technique used depends on the type of ASD, the age and size of the patient, associated conditions, and the experience of the surgical team. The clinical decision is made by the cardiac surgeon and cardiologist together, in discussion with the family.

Preparing for Surgery

Once the decision to operate has been made, the team carries out a set of preoperative checks to confirm the anatomy, assess overall health, and plan anaesthesia.

Typical preoperative tests include:

• Echocardiogram — the main imaging test, showing the location and size of the defect and the size of the heart chambers
• Electrocardiogram (ECG) — to look at heart rhythm and any signs of strain
• Chest X-ray — showing heart size and lung markings
• Blood tests — including full blood count, kidney and liver function, blood typing for possible transfusion
• Cardiac catheterisation — not always needed, but used in some adults and in cases where pulmonary pressures need direct measurement
• CT or MRI of the heart — in selected cases, especially for sinus venosus ASDs or unusual anatomy

In the days before surgery the team will explain anaesthesia, the use of the heart-lung machine, expected length of stay, and what to bring to hospital. The consent conversation is an important opportunity to ask anything that is still unclear — about scarring, future activity, follow-up, or anything that has been on your mind.

Practical preparations usually include:

• Fasting from food and milk for several hours before surgery, as advised by the team
• Adjusting or pausing certain medications under the doctor’s instructions
• Arranging a comfortable bag with familiar items — for a child, a favourite toy or blanket can help
• Talking honestly with an older child about what will happen, in age-appropriate terms
• Planning who will stay with the child in hospital and who will manage things at home

What Happens During the Operation

The operation is performed under general anaesthesia, meaning the patient is fully asleep and feels nothing. A breathing tube supports the lungs throughout. The procedure usually takes between two and four hours, although time spent in the operating theatre is longer because of preparation and recovery from anaesthesia.

The main steps are:

1. Anaesthesia and lines — once asleep, the anaesthetic team places intravenous lines, a urinary catheter, and monitoring lines for blood pressure and oxygen.
2. Incision — the surgeon opens the chest, most commonly through a midline sternotomy.
3. Cardiopulmonary bypass — the patient is connected to a heart-lung machine. This machine temporarily takes over the work of the heart and lungs, allowing the surgeon to stop the heart safely and work inside it.
4. Opening the right atrium — a small incision is made in the right atrium to expose the septum.
5. Closing the defect — a small hole may be closed by direct stitching. A larger hole is closed with a patch — usually a piece of the patient’s own pericardium or a synthetic material — sewn over the defect. If a sinus venosus ASD is being repaired, the surgeon also re-routes any abnormal pulmonary veins to drain correctly into the left atrium.
6. Restarting the heart — once the repair is checked, the heart is allowed to fill, restart, and take over the circulation again. The patient is gradually weaned off the heart-lung machine.
7. Closing the chest — drainage tubes are placed, the breastbone is closed with stainless steel wires (which stay in place for life and are not usually felt), and the skin is closed with stitches under the surface.

The repair is checked during surgery by transoesophageal echocardiography to confirm that the defect is completely closed and that surrounding structures are working normally.

The First Hours and Days After Surgery

After surgery the patient is transferred to the cardiac intensive care unit (ICU), still asleep and on the breathing machine. As anaesthesia wears off and the patient is stable, the breathing tube is removed — usually within several hours, sometimes the next morning. Most children and adults spend one to two days in the ICU.

During this time the team monitors:

• Heart rhythm and blood pressure
• Oxygen levels and breathing
• Output from the chest drains
• Pain, with regular pain relief adjusted to comfort
• Fluid balance and kidney function

Once stable, the patient moves to a regular cardiac ward. Drains are usually removed within two to three days. Mobilisation begins early — sitting up, then standing, then walking short distances with support. Eating and drinking resume as soon as the patient is comfortable. The overall hospital stay for an uncomplicated ASD closure is commonly around five to seven days, though this varies with age, the type of repair, and recovery.

Before discharge, the team explains:

• How to look after the chest wound
• Pain relief at home
• What activity is safe and what to avoid
• Warning signs that should prompt a call to the team
• The schedule for follow-up echocardiograms and clinic visits

Recovery at Home

Recovery at home unfolds in phases. The first two weeks are mainly about rest, pain control, and protecting the healing breastbone. Most patients feel tired and need extra sleep. The chest may feel sore, especially when laughing, coughing, or changing position. Pain relief tablets are usually needed for the first one to two weeks.

From weeks two to six, energy gradually returns. Gentle walking is encouraged. The breastbone takes about six to eight weeks to heal solidly, which is why the team will ask you to avoid heavy lifting, contact play, swimming, and sudden pulling movements during that time. Children are usually asked not to ride bicycles, climb high frames, or do rough play in this window. For adults, driving is typically restricted for a few weeks and lifting heavy objects is restricted for longer.

By six to eight weeks most patients are ready to return to school or work and resume normal day-to-day activity. Sports and more vigorous exercise are usually allowed from around three months, after a follow-up check confirms healing.

Full recovery — in the sense of feeling completely back to normal — commonly takes around two to three months. Children often bounce back faster than adults. Many parents notice that their child has more energy, feeds better, or grows more quickly in the months after surgery than before, particularly if the ASD had been causing symptoms.

Looking After the Wound

The chest wound is usually closed with dissolving stitches and a thin dressing or skin glue. Specific care depends on what the team uses, but in general:

• Keep the area clean and dry as advised
• Watch for redness, swelling, oozing, or increasing pain at the site
• Avoid soaking the wound (e.g., long baths, swimming) until the team confirms it has healed
• Protect the scar from direct sun for the first year, as fresh scars darken easily

When to Call the Team

You should contact the surgical team or seek urgent care if you notice:

• Fever above the threshold the team has given you
• Increasing chest pain, especially with breathing
• Wound redness, pus, or swelling
• The breastbone feeling unstable or making a clicking sensation
• New shortness of breath, fainting, or palpitations
• In a child: poor feeding, unusual sleepiness, or persistent crying that does not settle

Risks and Complications

ASD surgical closure is considered a low-risk operation in experienced paediatric and adult congenital cardiac centres. Outcomes have improved steadily over the last several decades, and most patients recover without serious complications. That said, any open-heart operation carries some risk, and being aware of what can happen helps families understand what the team is watching for.

Possible complications include:

• Bleeding — usually managed with drains; rarely requires a return to theatre
• Infection — of the wound or, very rarely, deeper structures
• Arrhythmias — irregular heart rhythms, often temporary, sometimes needing medication; uncommonly, a slow rhythm requires a pacemaker
• Pericardial effusion — fluid collecting around the heart in the weeks after surgery; sometimes part of “post-pericardiotomy syndrome,” usually treatable with medication
• Stroke or other neurological events — rare with modern bypass techniques
• Residual shunt — a small amount of leftover flow across the patch, usually small and not requiring further treatment
• Reactions to anaesthesia or blood products

In experienced centres, mortality from isolated ASD surgical closure is very low. The risk profile is higher when the operation is done late in life, when pulmonary hypertension is already advanced, or when other heart conditions are being repaired at the same time. Your surgical team should explain the specific risk picture for your situation.

Life After ASD Surgical Closure

The long-term outlook after timely ASD surgical closure is generally excellent. Most children and adults go on to lead full, active lives. Once the heart and lungs have recovered from the years of extra workload, exercise tolerance improves, symptoms ease, and long-term complications such as pulmonary hypertension and right-heart failure become far less likely.

Follow-up after surgery typically includes:

• An echocardiogram before discharge and at scheduled intervals afterwards (commonly at a few weeks, a few months, and then yearly or as advised)
• ECG checks to look for any rhythm changes
• Clinical review with a paediatric cardiologist or, for adults, an adult congenital heart disease specialist

Most patients can return to full physical activity, including sport, after the team confirms that healing is complete. There are usually no long-term restrictions on exercise, school, work, or pregnancy after an uncomplicated repair, although women planning pregnancy after adult ASD closure may be advised to have a pre-pregnancy review.

Endocarditis prophylaxis — antibiotics before dental procedures — is generally only advised for the first six months after surgery if a patch was used, and in specific circumstances thereafter. Your cardiologist will give clear guidance for your situation.

Lifelong follow-up at intervals is recommended, even when everything looks normal, because rare late issues such as atrial arrhythmias can develop years later, particularly in patients who were repaired in adulthood. Ongoing review allows these to be picked up and managed early.

ASD Surgical Closure in Adults

An ASD is a congenital condition — meaning it has been present since birth — but it sometimes goes undetected until adulthood. Adults coming to surgery often have a longer history of subtle symptoms that they had attributed to being unfit or growing older: breathlessness on stairs, palpitations, reduced stamina. Once the diagnosis is made, closure is generally offered, provided pulmonary pressures are not severely raised.

The operation itself is essentially the same as in children, but recovery in adults can feel slower. The breastbone takes the same six to eight weeks to heal, but adults often need longer off work depending on the physical demands of their job. Office-based work can usually be resumed at around six weeks; heavier physical work may need three months or more. Driving is restricted for several weeks. Pre-existing conditions such as high blood pressure or diabetes need careful management around the operation.

For adults with longstanding ASDs, arrhythmias such as atrial fibrillation can persist or develop after closure, even when the repair is technically perfect. These are managed by the cardiology team with medication and, in some cases, additional procedures.

Frequently Asked Questions

Will my child live a normal life after ASD surgical closure?

Most children who have a successful ASD repair go on to live completely normal lives, including normal schooling, sport, and activity. Long-term outlook is generally excellent when the operation is done at the right time, before lasting damage to the heart and lungs has occurred.

How long does the surgery take?

The operation itself usually takes between two and four hours. Total time in the operating theatre, including preparation and waking up from anaesthesia, is longer. The team will give you a more precise estimate before surgery.

How long is the hospital stay?

For an uncomplicated ASD closure, hospital stay is commonly around five to seven days — including one to two days in the cardiac ICU and the rest on a ward. Stays vary based on age, recovery, and any other conditions being treated.

How visible will the scar be?

A midline sternotomy leaves a vertical scar down the centre of the chest. In children, scars often fade significantly over the years. In adults the scar fades more slowly. Some patients are candidates for alternative incisions (such as a side incision in older girls or women) where this is anatomically possible.

Can the hole come back after surgery?

A properly closed ASD does not generally reopen. A small residual shunt (a tiny amount of leftover flow at the edge of the patch) is sometimes seen on echocardiogram and is usually not significant. Larger residual shunts are uncommon.

Will my child need to be on medication for life?

Most children do not need long-term medication after a successful ASD closure. Some take a blood-thinning medicine (such as aspirin) for a few months after surgery if a patch was used. Long-term medication is only needed if other heart problems are present.

When can normal activity resume?

Light walking begins in hospital. Gentle activity at home picks up over the first few weeks. The breastbone takes about six to eight weeks to heal, so heavy lifting, contact sport, swimming, and rough play are avoided during that period. Full activity and sport are usually allowed from around three months after a follow-up review.

Is the operation painful?

There is soreness in the chest, especially in the first one to two weeks. Pain is managed with regular medication while in hospital and at home. Most patients describe the discomfort as manageable, and it improves steadily.

Is ASD surgical closure the same as device closure?

No. Device closure is done through a catheter from the groin and does not involve opening the chest. It is suitable only for certain types of ASDs — mainly ostium secundum — with the right anatomy. Surgical closure is used when device closure is not suitable or when other heart conditions also need repair.

Will follow-up appointments continue for life?

Yes, periodic cardiology follow-up is usually recommended for life, even after a successful repair. The intervals become longer once everything is stable. This allows the team to pick up any late issues such as rhythm changes early.

Conclusion

ASD surgical closure is a well-established operation that addresses a congenital problem in a definitive way. For children, it removes the long-term burden of an unrepaired hole and allows the heart and lungs to grow and function normally. For adults, it restores normal blood flow and substantially reduces the risk of complications that develop over the decades when an ASD is left untreated.

The journey through diagnosis, surgery, and recovery can feel long, particularly in the days around the operation itself. Understanding each stage — why surgery is being suggested, what happens during the operation, what recovery looks like at home, and how follow-up continues afterwards — helps families and patients navigate it with more confidence. The medical and surgical teams looking after you are an important source of personalised guidance, and any question, however small, is worth asking.