Health Library

Branch Pulmonary Artery Stenosis in Children

There are different types of pulmonary narrowing:

• Branch pulmonary artery stenosis – narrowing in the right or left pulmonary artery branch
• Peripheral pulmonary stenosis – narrowing in smaller lung arteries farther from the heart
• Pulmonary valve stenosis – narrowing at the valve between the heart and pulmonary artery

Severe congenital (present from birth) pulmonary artery narrowing can reduce blood flow to the lungs and increase pressure on the heart. Many children with branch pulmonary artery stenosis do well with monitoring or treatment, as needed.

How the Heart and Pulmonary Arteries Work

The heart pumps blood through the body and lungs. Blood that needs oxygen travels from the right side of the heart into the pulmonary artery. The pulmonary artery then carries blood to the lungs, where it picks up oxygen.

The artery splits into two branches called the left and right pulmonary arteries. The right pulmonary artery sends blood to the right lung. The left pulmonary artery sends blood to the left lung.

Healthy pulmonary arteries allow blood to move easily from the heart to the lungs. When branch pulmonary artery stenosis causes narrowing in one branch, blood flow becomes uneven.

This can increase pressure in the heart and nearby blood vessels. Over time, severe pulmonary artery narrowing in children may strain the heart.

What Are the Signs and Symptoms of Branch Pulmonary Artery Stenosis?

Pulmonary artery stenosis symptoms depend on how narrow the artery is.

Mild Cases

Many children with mild pulmonary artery narrowing have no symptoms. Doctors may first notice the condition after hearing a heart murmur during a routine exam. A heart murmur is an unusual whooshing or rasping sound heard during the heartbeat. In many cases, this is a normal finding in healthy babies and children and will resolve as they grow older.

Moderate or Severe Cases

Children with more significant pulmonary artery stenosis (the arteries are narrower so the blood flow is more blocked) may have symptoms like:

• Fast breathing or shortness of breath
• Fatigue / tiredness during feeding or activity
• Poor weight gain in infants
• Bluish lips or skin (called cyanosis)
• Chest discomfort or dizziness in older children

What Causes Pulmonary Artery Stenosis in Children?

Many children with branch pulmonary artery stenosis are born with the condition. This type of congenital pulmonary artery narrowing happens when the pulmonary arteries do not develop normally before birth.

Some genetic syndromes can increase the risk of pulmonary artery narrowing in children, including Williams syndrome, Alagille syndrome and Noonan syndrome.

Branch pulmonary artery stenosis can also happen with other congenital heart defects such as Tetralogy of Fallot, pulmonary atresia, truncus arteriosus and ventricular septal defect.

Sometimes pulmonary artery stenosis develops later in childhood. This may happen when scar tissue forms after heart surgery.

Rarely, inflammation or pressure from nearby structures, such as a tumor or enlarged lymph node, can cause the pulmonary artery to narrow.

How is Branch Pulmonary Artery Stenosis Diagnosed?

Doctors diagnose this condition by examining the heart and measuring blood flow through the pulmonary arteries.

They may first hear a heart murmur during a physical exam. If they suspect pulmonary artery stenosis, the doctor may recommend imaging tests.

Tests used for pulmonary artery stenosis diagnosis may include:

• Echocardiogram – a heart ultrasound that shows blood flow through the pulmonary arteries
• Electrocardiogram (EKG) – a test that measures the heart’s electrical activity
• Chest X-ray – an image of the heart and lungs
• Cardiac CT or MRI – detailed images of the heart and blood vessels
• Cardiac catheterization – a procedure that measures pressure and blood flow in the heart

Doctors sometimes combine several pediatric heart imaging tests to understand the severity of the narrowing.

What Are the Treatment Options for Branch Pulmonary Artery Stenosis?

Treatment for branch pulmonary artery stenosis depends on how severe the narrowing is and how it affects blood flow to the lungs.

Monitoring Mild Cases

Children with mild pulmonary artery narrowing may not need treatment right away. Doctors may watch the condition with regular cardiology visits and imaging tests.

Minimally Invasive Procedures

Many children with branch pulmonary artery stenosis improve with catheter-based treatments. A catheter is a thin, flexible tube, like an IV. The doctor inserts it into a vein in the groin and threads it through blood vessels to reach the heart.

Catheter-based treatments may include:

• Balloon angioplasty – a balloon is inserted through the catheter and inflated to open up the narrow vessel.
• Pulmonary artery stents – a small metal mesh tube is placed through the catheter to keep the artery open.

Surgery

If a child’s condition is severe or keeps coming back after previous treatment, they may need surgery. Surgeons may rebuild the artery or widen the narrowed section. Surgery is done by opening the chest while the child is on a heart-lung machine. The machine works as the heart and lungs during surgery.

Sometimes doctors fix branch pulmonary artery stenosis awhile they are doing another congenital heart surgery.

What to Expect After Treatment

Most children recover quickly after treatment. Children who have catheter procedures often stay in the hospital for a short time. Many return to normal activities within a few days.

Recovery from surgery usually requires five to 10 days in the hospital. Full recovery at home takes six to eight weeks.

Doctors monitor the pulmonary arteries with follow-up imaging. In some cases, the artery may narrow again. This is called restenosis.

Regular pediatric cardiology follow-up visits help doctors track heart health as the child grows.

What is the Long-Term Outlook for Children With Branch Pulmonary Artery Stenosis?

Most children have a very good long-term outlook, especially when the narrowing is mild or treated early.

Several factors can affect a child’s long-term outlook, including:

• The severity of the narrowing
• Whether other congenital heart defects are present
• How well treatment restores blood flow

Many children with branch pulmonary artery stenosis grow and develop normally. But lifelong monitoring by a pediatric cardiology team may be recommended to watch how the heart is working over time.

Caring for a Child With Branch Pulmonary Artery Stenosis

Parents and caregivers play an important role in supporting a child with this condition.

Helpful steps may include:

• Going to all regular heart checkup appointments
• Monitoring growth and nutrition to make sure the child is gaining weight and eating well
• Watching for changes in breathing or activity, such as shortness of breath or getting tired faster
• Encouraging low- to moderate-intensity physical activity such as walking, swimming and cycling
• Working closely with heart specialists

Frequently Asked Questions About Branch Pulmonary Artery Stenosis

Is branch pulmonary artery stenosis dangerous?

It can be serious if the artery becomes very narrow. Mild cases may cause few problems, but doctors still monitor heart function closely.

Can children outgrow pulmonary artery stenosis?

Some mild pulmonary artery narrowing in children improves as the child grows. Others may need treatment or ongoing monitoring.

Will my child need surgery?

Not always. Many children improve with balloon angioplasty or pulmonary artery stents. Surgery is usually only done for more complex cases.

Can children with branch pulmonary artery stenosis play sports?

Many children can stay active. A cardiologist will recommend safe activity levels based on the child’s heart function.

How often will my child need heart checkups?

The number of follow-up visits depends on the severity of the condition. Many children with branch pulmonary artery stenosis need regular cardiology monitoring as they grow—usually every six months for babies and small children, and once a year for older kids and adults.