Congenital heart defects in children
Learn about symptoms, tests and treatments for children born with a problem in the structure of the heart (congenital heart defect).
If your child has a congenital heart defect, it means that your child was born with a problem in the structure of his or her heart.
Some congenital heart defects in children are simple and don't need treatment. Other congenital heart defects in children are more complex and may require several surgeries performed over a period of several years.
Learning about your child's congenital heart defect can help you understand the condition and know what you can expect in the coming months and years.
Serious congenital heart defects usually are noticed soon after birth or during the first few months of life. Signs and symptoms could include:
- Pale gray or blue skin color (cyanosis)
- Rapid breathing
- Swelling in the legs, belly or areas around the eyes
- Shortness of breath during feedings, leading to poor weight gain
Less-serious congenital heart defects may not be diagnosed until later in childhood. Signs and symptoms of congenital heart defects in older children may include:
- Easily becoming short of breath during exercise or activity
- Easily tiring during exercise or activity
- Fainting during exercise or activity
- Swelling in the hands, ankles or feet
When to see a doctor
Serious congenital heart defects are often diagnosed before or soon after your child is born. If you notice that your baby has any of the signs or symptoms above, call your child's doctor.
If your child has any of the signs or symptoms of less-serious heart defects as he or she grows, call your child's doctor. Your child's doctor can let you know if your child's symptoms are due to a heart defect or another medical condition.
How the heart works
To understand the causes of congenital heart defects, it may be helpful to know how the heart works.
The heart is divided into four hollow chambers, two on the right and two on the left. To pump blood throughout the body, the heart uses its left and right sides for different tasks.
The right side of the heart moves blood to the lungs through the lung (pulmonary) arteries. In the lungs, blood picks up oxygen then returns to the heart's left side through the pulmonary veins. The left side of the heart then pumps the blood through the body's main artery (aorta) and out to the rest of the body.
How congenital heart defects develop
During the first six weeks of pregnancy, the heart begins to form and starts beating. The major blood vessels that run to and from the heart also begin to develop during this critical time.
It's at this point in your baby's development that heart defects may begin to develop. Researchers aren't sure exactly what causes most of these defects, but they think genetics, certain medical conditions, some medications, and environmental or lifestyle factors, such as smoking, may play a role.
There are many different types of congenital heart defects. They fall into the general categories described below.
Abnormal connections in the heart or blood vessels
Abnormal connections allow blood to flow where it normally wouldn't. Holes in the walls between heart chambers are an example of congenital heart defects that involve an abnormal connection.
An abnormal connection can cause oxygen-poor blood to mix with oxygen-rich blood. This lowers the amount of oxygen sent through your child's body. Your child's skin or fingernails may look blue or pale gray (dusky). The heart and lungs have to work harder to accommodate abnormal blood flow.
Types of abnormal connections in the heart or blood vessels include:
- Atrial septal defect is a hole between the upper heart chambers (atria).
- Ventricular septal defect is a hole in the wall between the right and left chambers on the lower half of the heart (ventricles).
- Patent ductus arteriosus (PAY-tunt DUK-tus ahr-teer-e-O-sus) is a connection between the lung artery and the body's main artery (aorta). It's open while a baby is growing in the mother's womb, and normally closes a few hours after birth. But in some babies, it remains open, causing abnormal blood flow between the two arteries.
- Total or partial anomalous pulmonary venous connection occurs when all or some of the blood vessels from the lungs (pulmonary veins) attach to a wrong area or areas of the heart.
Congenital heart valve problems
Heart valves are like doorways between the heart chambers and the blood vessels. Heart valves open and close to keep blood moving in the correct direction. If the heart valves can't open and close correctly, blood can't flow smoothly.
Heart valve problems include valves that are narrowed and don't open completely (stenosis) or valves that don't close completely (regurgitation).
Examples of congenital heart valve problems include:
- Aortic stenosis (stuh-NO-sis). A baby may be born with an aortic valve that has one or two valve flaps (cusps) instead of three. This creates a smaller, narrow opening for blood to pass through. The heart must work harder to pump blood through the valve. Eventually, this leads to enlarging of the heart and thickening of the heart muscle.
- Pulmonary stenosis. A defect on or near the pulmonary valve narrows the pulmonary valve opening and slows the blood flow.
- Ebstein anomaly. The tricuspid valve — which is located between the right upper heart chamber (atrium) and the right lower chamber (ventricle) — is malformed and often leaks.
Combination of congenital heart defects
Some infants are born with several heart defects that affect the structure and function of the heart. Very complex heart problems may cause significant changes in blood flow or undeveloped heart chambers.
For example, tetralogy of Fallot (teh-TRAL-uh-jee of fuh-LOW) is a combination of four defects:
- A hole in the wall between the heart's ventricles
- A narrowed passage between the right ventricle and pulmonary artery
- A shift in the connection of the aorta to the heart
- Thickened muscle in the right ventricle
Other examples of complex congenital heart defects are:
- Pulmonary atresia. The pulmonary valve is missing, causing abnormal blood flow to the lungs.
- Tricuspid atresia. The tricuspid valve isn't formed. Instead, there's solid tissue between the right upper heart chamber (atrium) and the right lower chamber (ventricle). This congenital heart defect restricts blood flow and causes the right ventricle to be underdeveloped.
- Transposition of the great arteries. In this serious, rare heart defect, the two main arteries leaving the heart are reversed (transposed). There are two types. Complete transposition of the great arteries is typically noticed during pregnancy or soon after birth. Levo-transposition of the great arteries (L-TGA) is less common, and symptoms may not be noticed right away.
- Hypoplastic left heart syndrome. A major part of the heart fails to develop properly. For example, in hypoplastic left heart syndrome, the left side of the heart hasn't developed enough to effectively pump enough blood to the body.
Most congenital heart defects result from problems that occur early as the baby's heart is developing before birth. The exact cause of most congenital heart defects is unknown. However, certain environmental and genetic risk factors may play a role. They include:
- Rubella (German measles). Having rubella during pregnancy can cause problems in your baby's heart development. Your doctor can test you for immunity to this viral disease before pregnancy and vaccinate you against it if you aren't immune.
- Diabetes. A woman who had diabetes before getting pregnant can reduce the risk of congenital heart defects by carefully controlling blood sugar before and during pregnancy. Diabetes that develops during pregnancy (gestational diabetes) generally doesn't increase a baby's risk of developing a heart defect.
Medications. Certain medications taken during pregnancy may cause birth defects, including congenital heart defects. Give your doctor a complete list of medications you take before trying to become pregnant.
Medications known to increase the risk of congenital heart defects include thalidomide (Thalomid), angiotensin-converting enzyme (ACE) inhibitors, statins, the acne medication isotretinoin (Absorica, Amnesteem, others), some epilepsy drugs and certain anxiety drugs.
- Drinking alcohol during pregnancy. Drinking alcohol during pregnancy increases the risk of congenital heart defects.
- Smoking. If you smoke, quit. Smoking during pregnancy increases the risk of a congenital heart defect in the baby.
- Family history and genetics. Congenital heart defects sometimes run in families (are inherited) and may be associated with a genetic syndrome. Many children with an extra 21st chromosome (Down syndrome) have heart defects. A missing piece (deletion) of genetic material on chromosome 22 also causes heart defects.
Some possible complications that can occur with a congenital heart defect include:
- Congestive heart failure. This serious complication may develop in babies who have a significant heart defect. Signs of congestive heart failure include rapid breathing, often with gasping breaths, and poor weight gain.
- Heart infections. Congenital heart defects can increase the risk of infection of the heart tissue (endocarditis), which can lead to new heart valve problems.
- Heart rhythm problems. Heart rhythm problems (arrhythmias) can be caused by a congenital heart defect or from scarring that forms after surgery to correct a congenital heart defect.
- Slower growth and development (developmental delays). Children with more-serious congenital heart defects often develop and grow more slowly than do children who don't have heart defects. They may be smaller than other children of the same age and, if the nervous system has been affected, may learn to walk and talk later than other children.
- Stroke. Although uncommon, some children with congenital heart defects are at increased risk of stroke due to blood clots traveling through a hole in the heart and on to the brain.
- Mental health disorders. Some children with congenital heart defects may feel insecure or develop anxiety or stress because of their size, activity restrictions or learning difficulties. Talk to your child's doctor if you're concerned about your child's mental health.
Because the exact cause of most congenital heart defects is unknown, it may not be possible to prevent these conditions. If you have a high risk of giving birth to a child with a congenital heart defect, genetic testing and screening may be done during pregnancy.
There are some things you can do that might reduce your child's overall risk of birth defects such as:
- Get proper prenatal care. Regular checkups with your doctor during pregnancy can help keep mom and baby healthy.
- Take a multivitamin with folic acid. Taking 400 micrograms of folic acid daily has been shown to reduce birth defects in the brain and spinal cord and may help reduce the risk of heart defects as well.
- Don't drink or smoke. These lifestyle habits can negatively affect the baby's health. Also avoid secondhand smoke.
- Get a rubella (German measles) vaccine. A rubella infection during pregnancy may affect your baby's heart development. Be sure to get vaccinated before you try to get pregnant.
- Control your blood sugar. If you have diabetes, good control of your blood sugar can reduce the risk of heart defects.
- Manage chronic health conditions. If you have other health conditions, such as phenylketonuria, talk to your doctor about the best way to treat and manage them.
- Avoid harmful substances. During pregnancy, have someone else do any painting and cleaning with strong-smelling products.
- Check with your doctor before taking any medications. Some medications can cause birth defects. Let your doctor know about all the medications you take, including those bought without a prescription.
Some congenital heart defects are diagnosed before birth, while the baby is still in the womb. Signs of certain heart defects can be seen on a fetal ultrasound, a routine prenatal test used to check a baby's growth and development during pregnancy.
After birth, diagnosis of a congenital heart defect may occur if your child appears blue, has abnormal growth or your child's doctor hears an abnormal heart sound (murmur) while listening to your child's heart with a stethoscope.
Most heart murmurs are innocent, meaning that there is no heart defect and the murmur isn't dangerous to your child's health. However, some murmurs may be caused by abnormal blood flow to and from the heart.
Tests to diagnose a congenital heart defect include:
- Pulse oximetry. This noninvasive, painless test measures how much oxygen is in your child's blood. A sensor placed on the child's fingertip records the amount of oxygen in your child's blood. Too little oxygen may mean your child has a heart or lung problem.
- Electrocardiogram (ECG or EKG). This noninvasive test records the electrical activity of your child's heart. It can help diagnose heart defects or heart rhythm disorders. Sticky patches with sensors (electrodes) are placed on your baby's chest. Wires connect the patches to a computer, which displays results.
- Echocardiogram. An echocardiogram uses sound waves (ultrasound) to create images of you or your child's heart in motion. An echocardiogram allows the doctor to see the heart valves and heart muscle. If an echocardiogram is done on a baby before birth, it's called a fetal echocardiogram.
- Chest X-ray. Your child may have a chest X-ray to see if the heart is enlarged, or if the lungs contain extra blood or other fluid. These could be signs of heart failure.
- Cardiac catheterization. In this test, a thin, flexible tube (catheter) is inserted into a blood vessel, usually in the groin area, and guided to the heart. Catheterization can give your child's doctor more detailed information on heart function and blood flow. Certain heart treatments can be done during cardiac catheterization.
- Heart magnetic resonance imaging (MRI). A heart MRI is an increasingly common way to diagnose and evaluate congenital heart defects in adolescents and adults. A heart MRI creates 3D pictures of the heart, which allows for accurate measurement of the heart chambers.
Treatment of congenital heart defects in children depends on the specific type of heart problem and how severe it is. Sometimes, a congenital heart defect may have no long-term effect on your child's health and may safely go untreated. Certain defects, such as small holes, may close as your child ages.
Serious heart defects require treatment soon after they're diagnosed. Treatment may involve medications, heart procedures or a heart transplant.
Medications may be given to treat symptoms or complications of a congenital heart defect and may be used alone or with a heart procedure. Medications for congenital heart defects include:
- Blood pressure drugs. Examples include angiotensin-converting enzyme (ACE) inhibitors, angiotensin II receptor blockers (ARBs) and beta blockers.
- Diuretics. This type of medication reduces the amount of fluid in the body, which reduces the strain on the heart.
- Heart rhythm drugs. These medications, called anti-arrhythmics, help control an abnormal heartbeat (arrhythmia).
Surgery or other procedures
If your child has a severe congenital heart defect, a heart procedure or surgery may be recommended. Heart procedures and surgery done to treat congenital heart defects include:
- Fetal cardiac intervention. Rarely, if a serious defect is diagnosed before birth, a procedure can be done during pregnancy to correct the problem or help reduce complications of the defect as the child grows. Fetal cardiac intervention is rarely performed and only possible in very specific circumstances.
Cardiac catheterization. Some children and adults have their congenital heart defects repaired using thin, flexible tubes (catheters). Cardiac catheterization can be used to fix holes in the heart or areas of narrowing without open-heart surgery.
During cardiac catheterization, the doctor inserts one or more catheters into a blood vessel, usually in the groin, and to the heart. Tiny tools are threaded through the catheter to the heart to repair the defect. Some catheter procedures have to be done in steps over a period of years.
- Heart surgery. Your child may need open-heart surgery or minimally invasive heart surgery to repair a congenital heart defect.
- Heart transplant. If a serious heart defect can't be repaired, a heart transplant may be needed.
If your child has a congenital heart defect, lifestyle changes may be recommended to keep the heart healthy and prevent complications.
Sports and activity restrictions
Some children with a congenital heart defect may need to limit exercise or sports activities. However, many others with a congenital heart defect can participate in normal or near-normal activities. Your child's doctor can tell you which sports and types of exercise are safe for your child.
Sometimes, a congenital heart defect can increase the risk of infection in the lining of the heart or heart valves (infective endocarditis). Because of this risk, your child may need to take antibiotics to prevent infection before dental procedures, especially if they have a mechanical heart valve. Ask your child's cardiologist if preventive antibiotics are necessary for your child.
You may find that talking with other parents who've experienced the same situation brings you comfort and encouragement. Ask your doctor if there are any support groups in your area.
Living with a congenital heart defect can make some children feel stressed or anxious. Talking to a therapist or counselor may help you and your child learn new ways to manage stress and anxiety. Your doctor can suggest therapists that may be helpful to you or your child.
If your child has a life-threatening heart defect, it will likely be diagnosed soon after birth, or possibly before birth during a pregnancy ultrasound.
If you think your child has a heart defect that wasn't recognized at birth, talk to your child's doctor. Be prepared to describe your child's symptoms and provide a family medical history, since some heart defects tend to be passed down through families (are inherited).
Write down the following and bring the notes with you to your appointment:
- Any signs and symptoms your child is having, including any that may seem unrelated to heart problems.
- When each symptom began.
- All medications, vitamins or supplements that the child's mother took during pregnancy. Include herbs and supplements and any medicines bought without a prescription.
- Any medical conditions the mother of the child has or had.
- Whether or not the mom drank alcohol during pregnancy.
What you can do
Your time with your doctor is limited, so preparing a list of questions can help you make the most of your time together. You might want to ask questions such as:
- What tests does my child need? Do these tests require any special preparation?
- Does my child need treatment? If so, when?
- What is the best treatment?
- Do you think my child will have any long-term complications?
- How can we monitor for possible complications?
- If I have more children, how likely are they to have a congenital heart defect?
- Are there any brochures or other printed material that I can take home with me? What websites do you recommend visiting?
What to expect from your doctor
Your doctor is likely to ask you many questions. Being ready to answer them may save time to go over anything you want to spend more time on. Your doctor may ask:
- When did you first notice your child's symptoms?
- Can you describe your child's symptoms?
- When do these symptoms occur?
- Do the symptoms come and go, or does your child always have them?
- Do the symptoms seem to be getting worse?
- Do you have a family history of congenital heart defects?
- Does anything make your child's symptoms better?
- Has your child been growing and meeting developmental milestones as expected? (Ask your child's pediatrician if you're not sure.)
November 10th, 2021