Arterial Switch Operation

Introduction

If your newborn has been diagnosed with transposition of the great arteries (TGA), or has been scheduled for — or has already undergone — the arterial switch operation, you are likely living through one of the most frightening periods a parent can face. A serious heart condition in a baby just days old is overwhelming. This guide is written to help you understand what the surgery is, why it is needed so early in life, what the days in hospital look like, and what the months and years afterwards typically involve.

The arterial switch operation is now considered the standard corrective surgery for transposition of the great arteries. It is a complex operation, but it is also a well-established one, performed in specialised paediatric cardiac centres for several decades. Children who have this surgery as newborns generally go on to grow, attend school, play, and live full lives, with ongoing cardiac follow-up.

This article covers what the arterial switch operation does, how surgeons prepare your baby, what happens in the operating room, what to expect during the intensive care and ward stay, what recovery at home looks like, the risks involved, and the long-term outlook into childhood and adulthood. Specific treatment decisions for your baby will always come from your paediatric cardiac team, who know your child’s individual anatomy and condition.

What Is the Arterial Switch Operation?

The arterial switch operation — sometimes shortened to ASO, and also called the Jatene procedure after the surgeon who pioneered it — is a heart surgery that corrects the abnormal connections of the two main arteries leaving the heart.

The Heart Defect It Corrects

To understand what the surgery does, it helps to picture how blood normally flows through the heart and lungs.

In a healthy heart:

• The right side of the heart receives oxygen-poor blood from the body and pumps it through the pulmonary artery to the lungs, where it picks up oxygen.
• The left side of the heart receives oxygen-rich blood from the lungs and pumps it through the aorta to the rest of the body.

In transposition of the great arteries, the positions of these two arteries are switched. The aorta comes off the right ventricle and the pulmonary artery comes off the left ventricle. The result is that oxygen-poor blood that returns from the body gets pumped straight back out to the body again, instead of going to the lungs first. Meanwhile, oxygen-rich blood from the lungs circulates back to the lungs in a separate loop.

Without some mixing of blood between the two circulations, a baby with TGA cannot get enough oxygen to survive. In the womb, this mixing happens naturally through openings that are normal in a fetus. After birth, those openings start to close, which is why babies with TGA become severely ill within hours or days.

What the Surgery Does

The arterial switch operation corrects the underlying anatomy. Surgeons:

• Detach the two great arteries from where they incorrectly connect to the heart.
• Switch them so that the aorta is connected to the left ventricle and the pulmonary artery is connected to the right ventricle — the way they should be.
• Carefully move the coronary arteries (the small but essential vessels that supply blood to the heart muscle itself) onto what is now the aorta.

The result is that the heart, after recovery, pumps blood the way a normally formed heart does. The left ventricle, which is the stronger of the two pumping chambers, takes over its proper job of supplying the body.

Why It Is Done So Early

The arterial switch operation is usually performed within the first one to three weeks of life. Timing matters because the left ventricle of a newborn is briefly strong enough to take on the workload of pumping to the body. If the surgery is delayed for too long, the left ventricle — which has been pumping only to the lungs — can weaken and lose the ability to take on full systemic work without additional preparation. Early surgery avoids this problem.

Why the Arterial Switch Operation Is Performed

The arterial switch operation is performed primarily to treat transposition of the great arteries. TGA is one of the more common serious congenital heart defects diagnosed at or shortly after birth. The specific situations where the surgery is used include:

• TGA with intact ventricular septum — the most common form, where the great arteries are switched but the wall between the two lower chambers of the heart is normal. This is the classic indication for the arterial switch operation and is usually treated in the first two weeks of life.
• TGA with a ventricular septal defect (VSD) — where there is also a hole between the two lower chambers. The arterial switch is still the standard repair, and the VSD is closed at the same operation.
• TGA with VSD and left ventricular outflow tract obstruction — a more complex form, where the arterial switch may or may not be suitable depending on individual anatomy. The surgical team will decide based on detailed imaging.
• Taussig–Bing anomaly and certain other complex defects — in selected cases, the arterial switch is part of the repair.

For each baby, the surgical team reviews the echocardiogram and other imaging carefully to confirm that the arterial switch is the appropriate operation, or whether a different approach is needed.

Who Is a Candidate?

Most newborns diagnosed with TGA are candidates for the arterial switch operation, particularly when:

• The diagnosis is made early — before birth on fetal echocardiogram, or within the first days of life.
• The baby is stable enough to undergo surgery, with the help of medications and sometimes a temporary procedure to improve oxygen mixing before the operation.
• The left ventricle is still able to take on the systemic workload, which is usually the case in the first weeks after birth.
• The coronary artery anatomy is suitable for transfer. Most patterns are manageable, but some unusual patterns are more challenging and the team will plan accordingly.

Babies who are diagnosed later, or who have certain complex anatomies, may need a different staged approach — sometimes a procedure to strengthen the left ventricle first, or a different type of repair. These decisions are individual to each child.

Alternatives and Related Procedures

Because untreated TGA is not survivable, the question is not really whether to operate but which operation is most appropriate. Historically, two other approaches were used and are still occasionally relevant in specific situations.

Atrial Switch Operations (Mustard and Senning Procedures)

Before the arterial switch became standard, surgeons performed the Mustard or Senning operation. These procedures did not move the arteries; instead, they redirected blood at the level of the upper chambers (the atria) so that the body received oxygenated blood. They saved many lives but left the right ventricle pumping to the body in the long term, which over decades can lead to heart failure and rhythm problems. The atrial switch is rarely chosen for new patients today but is part of the medical history of many older children and adults living with TGA.

The Rastelli Procedure

In certain complex forms of TGA — particularly when there is also a ventricular septal defect and obstruction below the pulmonary artery — the Rastelli procedure or a related operation may be used instead of an arterial switch. The choice depends on the individual heart anatomy.

Pre-surgery Stabilisation: Balloon Atrial Septostomy

This is not an alternative to the arterial switch but a temporary measure that may be done in the first hours or days of life. A thin catheter with a balloon at the tip is passed into the heart, and the balloon is gently pulled across a small opening between the upper chambers to enlarge it. This allows more mixing of oxygen-rich and oxygen-poor blood, which improves the baby’s oxygen levels until the corrective surgery can be performed.

Preparing for the Arterial Switch Operation

Once TGA is diagnosed, preparation moves quickly. Many families have only days between learning of the diagnosis and the surgery itself. The medical team works in parallel on stabilising the baby and planning the operation.

Confirming the Diagnosis

The diagnosis is usually confirmed by echocardiogram, an ultrasound of the heart. This non-invasive test shows the connections of the great arteries, the position of the coronary arteries, and any associated defects such as a VSD. In some centres, additional imaging such as CT or MRI may be done, but echocardiogram alone is often enough.

If TGA was diagnosed before birth on fetal echocardiogram, the family may have had time to meet the surgical team and prepare. If it was diagnosed only after birth, everything happens at once.

Stabilising the Baby Before Surgery

Newborns with TGA usually need treatment in a neonatal or paediatric cardiac intensive care unit before surgery. This may include:

• Prostaglandin infusion — a medication given through a vein to keep open the ductus arteriosus, a small blood vessel that normally closes after birth. Keeping it open allows some mixing of blood between the two circulations and improves oxygen levels.
• Balloon atrial septostomy, if needed, to allow more mixing at the upper-chamber level.
• Oxygen monitoring and support, including assisted breathing if the baby is struggling.
• Feeding support, often through a tube in the early days because feeding by mouth can be difficult.

Tests Before Surgery

Before the operation your baby will have:

• Blood tests, including blood typing and matching for possible transfusion.
• Chest X-ray.
• Detailed echocardiogram to map coronary artery anatomy.
• Sometimes cardiac catheterisation or additional imaging in complex cases.

Talking with the Surgical Team

Before the operation, the surgeon and cardiologist will explain what they will do, what the expected outcome is, and what the main risks are for your baby specifically. You will be asked to sign a consent form. This is a difficult conversation to have about a newborn, and it is reasonable to ask the team to slow down, repeat things, and write things down for you. Ask any questions you have — including the simple ones. Bring a family member or friend if you can.

What Happens During the Arterial Switch Operation

While every surgeon has small variations in technique, the operation generally proceeds as follows:

1. Your baby is taken to the operating room and given general anaesthesia. A breathing tube is placed, and lines are inserted for monitoring and giving medications.
2. The surgeon makes an incision down the centre of the chest and opens the breastbone (sternum) to reach the heart.
3. Your baby is connected to a heart-lung machine (cardiopulmonary bypass), which takes over the work of the heart and lungs during the operation. The heart is then carefully stopped so the surgeon can work on it.
4. The aorta and pulmonary artery are detached above the valves.
5. The coronary arteries — the small but critical vessels that supply the heart muscle — are carefully cut away from the original aorta with a small button of surrounding tissue.
6. The arteries are switched into their correct positions, and the coronary arteries are reattached to what is now the new aorta.
7. If there is a VSD or other associated defect, it is repaired at the same time.
8. The heart is restarted and gradually weaned off the heart-lung machine.
9. Once the surgeon is satisfied that the heart is pumping well, drainage tubes are placed in the chest, the sternum is wired closed, and the skin is sutured.

In some cases, particularly if the heart is swollen after the operation, the surgeon may leave the chest open temporarily, covered with a sterile dressing, and close it in the intensive care unit a day or two later when swelling has gone down. This is a planned safety step, not a complication.

Where Your Baby Goes After the Operation

Immediately after surgery, your baby will be moved to the paediatric cardiac intensive care unit (PCICU or CICU). They will be on a ventilator (breathing machine), connected to monitors, and will have several lines and tubes in place. Seeing your baby for the first time after surgery is emotionally difficult — it is normal to be unprepared for how they look. The nurses and intensivists will walk you through what each line and tube does.

Recovery in the Hospital

Recovery happens in stages. Each baby is different, and timelines vary, but a general pattern follows.

The First Days: Intensive Care

The intensive care stay after an arterial switch operation typically lasts several days to about a week. During this time:

• The breathing tube is gradually removed as your baby’s lungs and heart take over.
• Medications support heart function and blood pressure.
• Drainage tubes in the chest remove any fluid that collects around the heart and lungs, and are removed when drainage slows.
• Feeding starts gradually, sometimes through a small tube into the stomach before by mouth.
• Pain and sedation are managed carefully so your baby is comfortable.
• The team watches closely for any complications, including bleeding, rhythm problems, or infection.

Moving to the Ward

Once your baby is stable, breathing on their own, and tolerating feeds, they move from intensive care to the cardiac ward. The ward stay usually lasts another week or so. During this phase:

• Feeding and weight gain become the main focus.
• The team checks the heart with regular echocardiograms.
• You will be more involved in your baby’s care — holding, feeding, changing — which is important both for the baby and for you.
• The team begins talking through what care will look like at home.

Total hospital stay is commonly around two weeks, though some babies go home sooner and some need longer, particularly if they had complex anatomy or any setbacks during recovery.

Before Going Home

Before discharge, you will be taught how to:

• Care for the chest incision and watch for signs of infection.
• Give any medications your baby will need at home.
• Recognise warning signs that need urgent medical attention.
• Manage feeding and monitor weight gain.

You will leave with follow-up appointments scheduled and a clear plan for who to call with questions.

Recovery at Home

The first weeks at home after the arterial switch operation are an adjustment for the whole family. Your baby is recovering from major surgery while also doing all the things newborns normally do — feeding, growing, sleeping irregularly. Many parents feel exhausted, anxious, and protective. This is normal.

The Incision and Sternum

The chest incision is closed with absorbable sutures and usually heals well. The breastbone, which was divided during surgery, takes about six to eight weeks to knit firmly. During this period, the team will give specific instructions about how to lift and carry your baby — usually scooping from underneath rather than picking up under the arms — to protect the healing bone.

Watch the incision for:

• Redness spreading beyond the edges.
• Swelling or fluid drainage.
• A fever in your baby.

Report these to the team promptly.

Feeding and Growth

Babies recovering from heart surgery often need extra calories because their bodies are working hard to heal. Some babies feed well; others tire easily and need smaller, more frequent feeds, or fortified milk. The team will weigh your baby regularly and may suggest changes to feeding if growth is slow.

Activity and Comfort

Newborns do not need to be told to rest — they sleep a great deal. As your baby grows over the following months, normal play and movement are encouraged. By the time they are sitting, crawling, and walking, most children who have had the arterial switch operation can do everything other children do.

Medications at Home

Some babies go home on medications such as low-dose aspirin (to reduce the risk of small clots while the surgical sites heal), diuretics for a short period, or others depending on the individual situation. Some babies need no medications at all after discharge. The team will explain exactly what your baby needs and for how long.

When to Call the Team

Call your cardiac team or seek urgent care if your baby has:

• Fever.
• Increasing redness, swelling, or drainage from the incision.
• Difficulty breathing, fast breathing at rest, or pulling in around the ribs with each breath.
• Poor feeding or vomiting that does not settle.
• A bluish colour to the lips or skin.
• Unusual sleepiness or being difficult to rouse.

Risks and Complications

The arterial switch operation is a major heart operation in a newborn, and there are real risks. Modern paediatric cardiac surgery has dramatically improved outcomes, and in experienced centres survival is generally high — commonly above 90 percent — but no operation of this complexity is without risk. Your team will discuss your baby’s specific risk profile with you before surgery.

Possible complications include:

• Bleeding — sometimes requiring a return to the operating room.
• Infection — of the wound, lungs, or bloodstream.
• Heart rhythm problems (arrhythmias) — some temporary, occasionally requiring medication or, rarely, a pacemaker.
• Coronary artery problems — because the coronary arteries are moved during the operation, narrowing at the reattachment sites is a long-term concern that is monitored throughout childhood and adult life.
• Narrowing of the pulmonary arteries at the suture lines — one of the more common long-term issues, sometimes requiring a catheter procedure or further surgery years later.
• Leakage of the neo-aortic valve — the valve that was originally the pulmonary valve now functions as the aortic valve, and over many years some leakage can develop.
• Reduced heart function — usually temporary in the recovery period.
• Neurological events — uncommon but possible after any open-heart surgery in newborns.
• Need for additional procedures later in life, either by catheter or surgery, in a minority of patients.

Most children who have a successful arterial switch operation do well over the long term, but lifelong follow-up is part of the picture from the start.

Life After the Arterial Switch Operation

The arterial switch operation gives babies with TGA a fundamentally normal circulation. Most children grow, develop, attend school, and participate in everyday activities like their peers. Long-term studies of patients now followed into adulthood after this operation are reassuring, while also pointing to the importance of ongoing cardiology care.

Growth and Development

In the first year after surgery, the team will pay close attention to weight gain and developmental milestones. Some babies who had a prolonged hospital stay or complications may benefit from extra developmental support — physiotherapy, feeding therapy, or early intervention services — in the first year or two. Most catch up well.

Physical Activity and Sport

By school age, most children who have had the arterial switch operation can take part in normal physical activity, including sport. Some may have minor restrictions depending on their specific anatomy and any residual issues, and the cardiologist will advise on this individually. The general direction of advice from paediatric cardiology is that physical activity is good for these children, with the cardiologist’s guidance on any specific limits.

School and Daily Life

Most children who had the arterial switch as newborns go to school like their peers and do not need special accommodations because of their heart. Some families find it helpful to inform the school about the medical history and any emergency contacts, even if no day-to-day adjustments are needed.

Lifelong Cardiac Follow-up

Children who have had the arterial switch operation should be followed throughout childhood and into adulthood by a cardiologist familiar with congenital heart disease. Follow-up visits, including echocardiograms and sometimes other tests, watch for:

• The performance of the pumping chambers.
• The function of the heart valves, particularly the neo-aortic valve.
• The pulmonary arteries, looking for any narrowing.
• The coronary arteries, particularly as the child grows.
• Heart rhythm.

Some patients will eventually need additional procedures — for instance, a catheter intervention to widen a narrowed pulmonary artery branch, or, less commonly, further surgery. These are usually well-tolerated when needed.

As your child becomes a teenager and young adult, the cardiologist will discuss the transition to adult congenital heart disease care. Topics such as pregnancy, sport at higher intensity, and any precautions before dental work or other procedures will be part of these later conversations.

Emotional Recovery for the Family

The arterial switch operation is a medical success story for your baby, but the experience of going through it as a parent leaves a lasting mark. Many parents describe ongoing anxiety, particularly in the first year — jumping at every cough, watching breathing more closely than other parents do. This is a very common reaction. Talking with other parents who have been through similar surgery, with a counsellor, or with your paediatric team can help. Over time, most families find that the heart surgery becomes one chapter of their child’s story rather than the defining one.

Frequently Asked Questions

What is the arterial switch operation?

It is heart surgery performed on newborns to correct transposition of the great arteries. The surgeon switches the aorta and pulmonary artery into their correct positions and carefully moves the coronary arteries, restoring normal circulation.

When is the surgery usually done?

Most often within the first one to three weeks of life. Early surgery is important because the left ventricle is briefly strong enough at that age to take over its proper role of pumping to the body.

How long does the operation take?

The surgery itself usually takes four to seven hours, sometimes longer for complex anatomy. The total time your baby is away from you, including anaesthesia preparation and transfer to intensive care, will be longer.

How long is the hospital stay?

A typical stay is around two weeks — roughly several days in intensive care and another week or so on the cardiac ward. Some babies are home sooner; others, particularly those with complex anatomy or complications, stay longer.

Will my baby have a scar?

Yes, there is a scar down the centre of the chest. The scar fades over time and many children become accustomed to it without distress. Talking openly with your child as they grow about why they have a scar usually helps.

Will my child need more heart surgery?

Most children who have a successful arterial switch operation do not need further major heart surgery. A minority will need additional procedures — often by catheter, sometimes surgical — usually to address narrowing in the pulmonary arteries or, less commonly, issues with valves or coronary arteries. Lifelong follow-up is the reason these things are caught early when they happen.

Will my child be able to play sport?

Most children can take part in normal physical activity, including school sport. Specific advice for higher-intensity or competitive sport will come from your cardiologist based on your child’s individual heart function and any residual issues.

Can my child live a normal life as an adult?

Long-term outcomes after the arterial switch operation are generally good. Many of the first generation of patients are now adults living full lives. Adult congenital heart disease care, regular cardiology review, and attention to general heart health remain part of life.

Is the arterial switch operation safe?

It is a major operation with real risks, but in experienced paediatric cardiac surgery centres it has a high success rate, with survival commonly above 90 percent and outcomes that have steadily improved over the past two decades. Your surgical team can discuss the specific outlook for your child.

What if my child was born somewhere without paediatric cardiac surgery?

Because TGA needs treatment quickly, babies diagnosed in places without specialised paediatric cardiac surgery are usually transferred urgently to a centre that can perform the operation. The transferring and receiving teams coordinate to keep the baby stable during the move.

Conclusion

A diagnosis of transposition of the great arteries is one of the hardest things a family can hear in the first days of a child’s life. The arterial switch operation has transformed what was once a fatal condition into one with a generally good long-term outlook. The surgery is complex, but it is also well-established, performed in specialised centres around the world, and refined steadily over decades.

The journey is not only the operation itself but the days in intensive care, the weeks of early recovery, the months of growth and follow-up, and the lifetime of cardiac care that follows. Most children who have this surgery as newborns grow up to attend school, play, work, and live full lives, with the support of a cardiology team who knows them. Your paediatric cardiac team is your partner through each of these stages, and your questions — large and small — are an important part of your child’s care.