Balloon Pulmonary Valvotomy

Introduction

If your child has been diagnosed with pulmonary valve stenosis and the cardiology team has suggested balloon pulmonary valvotomy, this guide is written for you. It walks through what the procedure is, why it is done, how to prepare your child, what happens on the day, and what recovery and follow-up look like in the weeks, months, and years afterwards.

Pulmonary valve stenosis — a narrowing of the valve that lets blood flow from the right side of the heart to the lungs — is one of the more common congenital heart conditions. It is estimated to account for around 8 to 10 percent of all congenital heart defects. Many children with mild narrowing never need treatment. When the narrowing is moderate or severe, balloon pulmonary valvotomy has become the first-line treatment in most centres, replacing open-heart surgery for the great majority of cases.

The procedure is sometimes called balloon pulmonary valvuloplasty in medical literature, and you may hear both terms used interchangeably. Throughout this article we use balloon pulmonary valvotomy because it is the term most patients and families search for.

What Is Balloon Pulmonary Valvotomy?

Balloon pulmonary valvotomy is a minimally invasive cardiac procedure that opens a narrowed pulmonary valve using a balloon-tipped catheter. A catheter is a long, thin, flexible tube. The cardiologist inserts it into a vein, usually in the groin, and gently advances it through the blood vessels into the heart. Once the balloon at the tip of the catheter is positioned across the narrowed valve, it is inflated for a few seconds. This stretches and separates the valve leaflets — the thin flaps that open and close to control blood flow — allowing the valve to open more widely.

The pulmonary valve sits between the right ventricle (the lower right chamber of the heart) and the pulmonary artery (the blood vessel that carries blood to the lungs). When this valve is narrowed, the right ventricle has to pump much harder to push blood through. Over time, this extra work can thicken the muscle of the right ventricle and, if untreated in severe cases, can lead to right-sided heart failure.

Because balloon pulmonary valvotomy is performed through a small puncture in the groin rather than by opening the chest, it is considered a transcatheter procedure rather than surgery in the traditional sense. Children typically go home within a day or two, and the visible mark left behind is no larger than a pinprick.

Why Is Balloon Pulmonary Valvotomy Performed?

The procedure is performed to relieve obstruction across the pulmonary valve so that blood can flow more easily from the heart to the lungs. The main goals are to:

• Reduce the pressure inside the right ventricle
• Lower the pressure gradient across the narrowed valve
• Prevent long-term thickening or strain of the right ventricle
• Improve symptoms such as breathlessness, fatigue, or poor feeding in infants
• Reduce the chance of complications later in life, including arrhythmias and heart failure

The cardiology team usually measures the severity of pulmonary valve stenosis using echocardiography (an ultrasound scan of the heart). Severity is described as mild, moderate, or severe based on the pressure difference (the gradient) across the valve and on how the right ventricle is coping. Doctors typically consider balloon pulmonary valvotomy when:

• The pressure gradient across the valve is moderate to severe (commonly when the peak gradient exceeds around 40 mmHg, though exact thresholds depend on the child’s symptoms and the team’s judgement)
• The right ventricle shows signs of strain or thickening
• The child has symptoms such as breathlessness on exertion, fatigue, chest discomfort, or fainting episodes
• A newborn has critical pulmonary stenosis and is dependent on extra circulation to the lungs

Children with mild pulmonary valve stenosis often need only monitoring with periodic echocardiograms and no procedure at all.

Who Is a Candidate?

Most children with moderate to severe pulmonary valve stenosis caused by fused or thickened valve leaflets are good candidates for balloon pulmonary valvotomy. This includes:

• Newborns with critical pulmonary valve stenosis (in whom the procedure is often performed urgently in the first days or weeks of life)
• Infants and children with moderate or severe narrowing
• Adolescents and, occasionally, adults whose stenosis was not treated in childhood or has worsened over time

Some valves do not respond as well to balloon dilation. These include valves that are heavily thickened (called dysplastic valves), which are more often seen in children with certain genetic conditions such as Noonan syndrome. In those situations, the procedure may still be tried, but surgical valve repair or replacement may be needed if the result is incomplete.

The decision about whether your child is suitable rests with the paediatric cardiology team. They will look at the echocardiogram, your child’s overall health, the valve’s anatomy, and whether there are any other heart problems that need to be addressed at the same time.

Symptoms That Led to the Diagnosis

If you are reading this, your child has likely already been diagnosed. Looking back at the symptoms can help you understand why the cardiology team has recommended treatment. Pulmonary valve stenosis can present differently depending on age and severity.

In newborns and infants

• Rapid or laboured breathing
• Fatigue or sweating during feeds
• Poor weight gain
• A bluish tinge to the skin or lips (cyanosis) in severe cases
• A heart murmur picked up on routine examination

In older children, adolescents, and adults

• Shortness of breath, especially with exercise
• Tiredness during sports or physical activity
• Chest discomfort
• Fainting (syncope), particularly during exertion
• A heart murmur noted on examination

Many children with mild or moderate stenosis have no obvious symptoms and are diagnosed after a murmur is detected during a routine check-up.

Alternatives to Balloon Pulmonary Valvotomy

The main alternatives to consider with your child’s cardiologist are watchful waiting and surgical treatment.

Watchful waiting

For mild pulmonary valve stenosis, no procedure may be needed. Children are followed with regular echocardiograms to make sure the narrowing is not progressing and that the heart is coping well. Many people with mild stenosis live a normal life without treatment.

Surgical pulmonary valvotomy or valve repair

Before balloon valvotomy became widely available, surgical valvotomy through open-heart surgery was the standard treatment. Today, surgery is generally reserved for situations where balloon dilation is not expected to work well or has not given a satisfactory result. Examples include:

• Very thickened (dysplastic) valves that do not open well with a balloon
• Pulmonary valve stenosis combined with other heart defects that need surgical repair at the same time (such as tetralogy of Fallot)
• Significant narrowing above or below the valve that cannot be addressed by a balloon

Pulmonary valve replacement

This is usually a long-term consideration rather than an immediate alternative. Some patients who have had balloon valvotomy years earlier may eventually develop significant pulmonary regurgitation (leakiness of the valve) and may need valve replacement in adulthood. This can sometimes be done through a catheter as well, using a transcatheter pulmonary valve.

Major societies, including the American Heart Association and the American College of Cardiology, describe balloon pulmonary valvotomy as the preferred first-line treatment for most cases of isolated valvar pulmonary stenosis in children. Your child’s team will explain which option fits best given the specific anatomy.

Preparing for the Procedure

Preparation usually begins one to two weeks before the procedure with a clinic visit and a set of tests. The exact tests depend on your child’s age and overall health.

Tests your child may have

• Echocardiogram: the main test used to confirm the severity of the stenosis and plan the procedure
• Electrocardiogram (ECG): to record the heart’s electrical activity
• Chest X-ray: to look at the size and shape of the heart and lungs
• Blood tests: including blood count, kidney function, and clotting tests
• Anaesthesia review: a meeting with the anaesthetist who will care for your child during the procedure

In the days before

• Tell the team about any medications, supplements, or herbal remedies your child takes. Some may need to be stopped or adjusted.
• Report any recent illness — especially fever, cough, or cold — as the procedure may need to be postponed if your child is unwell.
• Follow the fasting instructions carefully. Children usually need to stop solid food about 6 to 8 hours before, formula about 6 hours before, breast milk about 4 hours before, and clear fluids about 2 hours before. Confirm the exact times with the hospital.
• Bring familiar comfort items — a favourite blanket, soft toy, or book — to help your child settle before and after.

What to expect on the day

You will usually arrive at the hospital a few hours before the procedure. Your child will be weighed, examined, and have an intravenous (IV) line placed. The cardiologist and anaesthetist will speak with you, explain the plan, and ask you to sign a consent form. You will be told what to expect about pain relief, sedation, and where you can wait while the procedure takes place.

What Happens During Balloon Pulmonary Valvotomy

The procedure takes place in a cardiac catheterisation laboratory (cath lab) — a specialised room with X-ray equipment and monitors used to guide catheter procedures.

Anaesthesia

Infants and younger children are usually given general anaesthesia so they are completely asleep. Older children and adults may have deep sedation instead, depending on the team’s practice. The anaesthetist monitors your child’s breathing, heart rate, and oxygen levels throughout.

Step-by-step inside the cath lab

1. Once your child is asleep, the skin in the groin is cleaned and numbed. A small puncture is made in the femoral vein.
2. A short tube called a sheath is placed in the vein. Through this sheath, the cardiologist passes thin guide wires and catheters.
3. Using live X-ray imaging (fluoroscopy), the catheter is gently guided through the veins into the right side of the heart and across the pulmonary valve.
4. The team measures the pressure in the right ventricle and in the pulmonary artery. The difference between these two pressures — the gradient — confirms how tight the valve is.
5. A balloon catheter is then chosen. The size is matched to the diameter of the valve ring, usually slightly larger than the valve opening itself.
6. The balloon is positioned across the valve and inflated for a few seconds, often with contrast dye so the team can see it clearly. The inflation stretches and separates the fused valve leaflets.
7. The balloon is deflated and removed. Pressure measurements are taken again to confirm that the gradient across the valve has fallen.
8. If the result is not satisfactory, the cardiologist may inflate the balloon a second time or use a slightly larger balloon.
9. Once the team is satisfied, the catheters and sheath are removed. Pressure is held over the groin puncture site for several minutes to stop any bleeding.

The procedure itself usually takes about one to two hours, although the total time in the cath lab including anaesthesia setup and recovery is longer.

Recovery and Healing

After the procedure, your child will be moved to a recovery area or a paediatric high-dependency unit for close monitoring.

The first hours

• Your child will gradually wake from anaesthesia. Some grogginess, irritability, or nausea is normal.
• Heart rate, blood pressure, oxygen levels, and the groin puncture site will be checked frequently.
• To allow the puncture site to seal, your child will need to keep the leg straight and lie flat for several hours. For infants, the nursing team will help position your child carefully.
• Once your child is alert and the puncture site is stable, sips of fluid and light food can usually be offered.

Hospital stay

Most children stay in hospital for one night, occasionally two. Newborns and infants with critical pulmonary stenosis may stay longer because their care is more complex. Before discharge, an echocardiogram is often repeated to confirm that the valve is opening better and to check for any leakiness.

At home in the first week

• Keep the groin puncture site clean and dry. A small dressing is usually in place; the team will tell you when it can be removed.
• A small bruise around the puncture site is common and fades over one to two weeks.
• Avoid bathing in a tub, swimming, or soaking the site for the period your team advises (often about a week).
• Limit strenuous activity, climbing, and rough play for the first few days. Older children should avoid sports and gym class for around a week, or as advised.
• Younger children can usually be carried, cuddled, and held normally. Babies can be fed normally.

Returning to normal life

Follow-up

The first follow-up echocardiogram is usually scheduled within a few weeks. Further follow-up appointments are arranged at intervals — commonly at six months, a year, and then yearly or every few years depending on the result. Lifelong cardiology follow-up is generally recommended because the valve can sometimes narrow again or become leaky over time.

Risks and Complications

Balloon pulmonary valvotomy is considered a safe procedure in experienced paediatric cardiology centres. Serious complications are uncommon, but no procedure is without risk. The team will explain the specific risks for your child during the consent discussion. Possible complications include:

• Bleeding or bruising at the groin puncture site. Minor bruising is common; significant bleeding is rare.
• Damage to the femoral vein. Occasionally the vein can become narrowed or clotted, which is more relevant in very small infants.
• Pulmonary regurgitation (a leaky valve). Some degree of leakiness is common after dilation. Mild or moderate leakiness is usually well tolerated for many years but may need monitoring or, in some cases, treatment later in life.
• Arrhythmias. Irregular heart rhythms may occur during the procedure when catheters pass through the heart. These usually settle quickly.
• Tearing of the pulmonary artery or valve ring. A rare but more serious complication.
• Need for repeat procedure. In a small number of children, the valve does not open enough or narrows again over time, and the procedure may need to be repeated.
• Reactions to contrast dye or anaesthesia. These are uncommon and the team is prepared to manage them.
• Infection. Rare, given how small the puncture site is.

In newborns with critical pulmonary stenosis, the procedure is more complex and risks are higher, but it remains the preferred option in most cases because the alternative — open-heart surgery in a newborn — carries its own significant risks.

Life After Balloon Pulmonary Valvotomy

For most children, balloon pulmonary valvotomy provides lasting relief. Reported success rates in published clinical studies are high, with the majority of suitable children achieving a substantial drop in the pressure gradient and a durable result over many years. Most go on to lead normal, active lives.

Activity and sport

After the initial recovery period, most children can participate fully in school sports and physical activity. Specific recommendations depend on the residual gradient and any valve leakiness. The cardiology team will give individual advice. Children with an excellent result usually have no restrictions.

Long-term follow-up

Even after a successful procedure, lifelong follow-up with a cardiologist is generally advised. The reasons include:

• Monitoring the valve for any re-narrowing (restenosis)
• Checking for pulmonary regurgitation, which can slowly progress over years
• Monitoring the size and function of the right ventricle
• Identifying the small number of patients who may eventually need a pulmonary valve replacement

Pregnancy and adolescence

Adolescents and adults who had balloon pulmonary valvotomy in childhood can usually expect normal life events, including pregnancy. A cardiology review is usually advised before planning pregnancy so that the valve function and right ventricle can be checked.

Dental care and infection prevention

Children with congenital heart disease are sometimes advised to take additional steps to prevent infective endocarditis (infection of the heart valves). The current general view in major guidelines, including those from the American Heart Association, is that routine antibiotic prophylaxis before dental procedures is only needed for a small group of patients with the highest risk. Your child’s cardiologist will tell you whether your child falls into that group. Either way, good oral hygiene and regular dental check-ups are important.

Will My Child Need Another Procedure Later?

This is one of the questions parents ask most often. The honest answer is: most children do not need another procedure, but some do. Possible scenarios include:

• Restenosis of the valve. A small proportion of children develop re-narrowing of the valve over the years and may need a repeat balloon procedure. This is more common when the original valve was unusually thickened.
• Progressive pulmonary regurgitation. Some patients develop a leaky valve over time. If the leakage becomes significant and the right ventricle starts to enlarge, pulmonary valve replacement may be considered later in life. This can often be done through a catheter rather than open surgery.
• Other congenital heart issues. If your child has additional heart conditions, separate procedures or surgeries may be planned over time.

This is why lifelong cardiology follow-up matters even when your child feels completely well.

Frequently Asked Questions

Is balloon pulmonary valvotomy a surgery?

Not in the traditional sense. The chest is not opened and the heart is not stopped. It is a catheter-based procedure performed through a small puncture in the groin vein. Many families find this reassuring compared with open-heart surgery.

How long does the procedure take?

The procedure itself usually takes about one to two hours. The total time in hospital, including preparation, anaesthesia, and recovery, is longer.

Will my child feel pain?

During the procedure your child is asleep under general anaesthesia or deeply sedated and will feel nothing. Afterwards, some soreness at the groin puncture site is normal. Most children manage with paracetamol or another mild pain reliever recommended by the team.

How long is the hospital stay?

Most children stay one night, sometimes two. Newborns and infants with critical pulmonary stenosis may need a longer stay because their care is more complex.

When can my child go back to school?

Most school-age children return to school within about a week, depending on how they feel and on the cardiologist’s advice. Sports and gym class are usually restricted for a slightly longer period.

Will my child be able to play sports?

After full recovery, most children can take part in sports and physical activity. Specific advice depends on the result of the procedure and any residual valve issues. The cardiology team will give a personalised recommendation.

Is the procedure done in newborns?

Yes. In newborns with critical pulmonary valve stenosis, balloon pulmonary valvotomy is often performed in the first days or weeks of life. It is more technically demanding in small babies but is generally preferred over open-heart surgery in this group.

Can adults have balloon pulmonary valvotomy?

Yes. Adults whose pulmonary valve stenosis was not treated in childhood, or who have had the valve narrow again, can have the procedure. Most adult cases are managed in centres familiar with adult congenital heart disease.

What if the balloon does not open the valve enough?

The cardiologist may try a second inflation or a slightly larger balloon. If the result is still not satisfactory, surgical treatment may be considered later. The team will discuss the findings with you before any next step.

Will my child need to take heart medications afterwards?

Most children do not need long-term heart medication after a successful procedure. Some may be prescribed a short course of medication depending on the situation. Your cardiologist will explain whether any medication is needed.

How often will follow-up be needed?

The first follow-up is usually within a few weeks. After that, reviews are typically arranged at six months, a year, and then yearly or every few years depending on the result. Lifelong follow-up is generally advised.

Conclusion

A diagnosis of pulmonary valve stenosis is understandably worrying, particularly when it affects a baby or young child. Balloon pulmonary valvotomy has changed the treatment of this condition significantly. By opening the narrowed valve through a small catheter rather than through open-heart surgery, the procedure relieves the obstruction quickly, reduces the strain on the right side of the heart, and allows most children to return to ordinary life within days.

For the majority of children with moderate or severe valvar pulmonary stenosis, the result is durable and lifelong. A smaller number need a repeat procedure or, much later, a pulmonary valve replacement. Lifelong follow-up with a cardiologist helps catch these situations early and keeps the heart in good shape across the years.

Your child’s care team is the best source of personalised information about the specific anatomy, the expected result, and the long-term plan. This guide is meant to help you understand the procedure and the journey around it — so that the conversations with your team feel clearer and the decisions ahead feel more manageable.