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Types of Heart Disease in Children

Heart Disease in Children

Heart disease is difficult enough when it strikes adults, but it can be especially tragic in children.

There are many different types of heart problems that can affect children. They include congenital heart defects, viral infections that affect the heart, and even heart disease acquired later in childhood due to illnesses or genetic syndromes.

The good news is that with advances in medicine and technology, many children with heart disease go on to live active, full lives.

Congenital Heart Disease

Congenital heart disease is a type of heart disease that children are born with, usually caused by heart defects that are present at birth.

In fact, the most common heart conditions found in children are structural heart defects, which occur in roughly 8 of 1,000 live births. These usually involve a problem with the heart muscle or the heart valves, and include:

  • heart valve conditions like a narrowing of the aortic valve, which restricts blood flow, or a mitral valve prolapse, where the mitral valve leaks
  • defects in the wall that separates the left and right sides of the heart (the septum)

Other congenital heart defects that affect children include:

  • hypoplastic left heart syndrome (HLHS), where the left side of the heart is underdeveloped
  • holes in the heart, typically in the walls between the chambers and between major blood vessels leaving the heart; they include ventricular septal defects, atrial septal defects, and patent ductus ateriosus
  • tetralogy of Fallot, which is a combination of four defects, including a hole in the ventricular septum, a narrowed passage between the right ventricle, pulmonary artery, a thickened right side of the heart, and a displaced aorta

Congenital heart defects may have long-term effects on a child’s health. They’re usually treated with surgery, catheter procedures, medications, and in severe cases, heart transplants.

Some children will require lifelong monitoring and treatment.


Atherosclerosis is the term used to describe the buildup of fat and cholesterol-filled plaques inside the arteries. As the buildup increases, arteries become stiffened and narrowed, which increases the risk of blood clots and heart attacks. It typically takes many years for atherosclerosis to develop. It’s unusual for children or teenagers to suffer from it.

However, obesity, diabetes, hypertension, and other health issues put children at higher risk. Doctors recommend screening for high cholesterol and high blood pressure in children who have risk factors like family history of heart disease or diabetes and are overweight or obese.

Treatment typically involves lifestyle changes like increased exercise and dietary modifications.


An arrhythmia is an abnormal rhythm of the heart. This can cause the heart to pump less efficiently.

Many different types of arrhythmias may occur in children, including:

  • a fast heart rate (tachycardia)
  • a slow heart rate (bradycardia)
  • long Q-T Syndrome (LQTS)
  • Wolff-Parkinson-White syndrome (WPW syndrome)

Symptoms may include:

  • weakness
  • fatigue
  • dizziness
  • fainting
  • difficulty feeding

Treatments depend on the type of arrhythmia and how it’s affecting the child’s health.

Eisenmenger Syndrome

Though not a type of heart disease specifically, this syndrome typically indicates a problem with the heart. Eisenmenger’s is actually a collection of three symptoms, including:

  • cyanosis, pale blue or grayish skin due to decreased oxygen in the blood
  • pulmonary hypertension, high blood pressure in the blood vessels of the lungs
  • polycythaemia, excess number of red blood cells

This syndrome may affect adolescents and adults with certain congenital heart defects that were repaired later in life or were never repaired. However, it can also occur in newborns born with pulmonary hypertension.

Basically, Eisenmenger syndrome is a sign that the blood isn’t flowing correctly from the left to the right side of the heart. Left untreated, it can cause blood clots, stroke, and kidney failure.

Treatment usually depends on the symptoms and involves medications to decrease pulmonary hypertension, supplemental oxygen, and sometimes a removal of blood to reduce the excess number of circulating red blood cells (phlebotomy).

Kawasaki Disease

This is a rare disease that primarily affects children and can cause inflammation in the blood vessels in the hands, feet, mouth, lips, and throat. It also produces a fever and swelling in the lymph nodes. Researchers aren’t sure yet what causes it.

According to the American Heart Association (AHA), the illness is a major cause of heart conditions in as many as 1 in 5 children. Most are under the age of 5.

Treatment depends on the extent of the disease, but is often prompt treatment with IV gamma globulin or aspirin. Corticosteroids can sometimes reduce future complications. Children who suffer from the disease often require lifelong follow-up appointments to keep an eye on heart health.

Heart Murmurs

A heart murmur is a “whooshing” sound made by blood circulating through the heart’s chambers, valves, or through blood vessels near the heart. Sometimes it’s harmless. Other times it may signal an underlying cardiovascular problem.

Heart murmurs may be caused by congenital heart defects, fever, or anemia. If a doctor hears a heart murmur in a child, they’ll perform additional tests to be sure the heart is healthy. “Innocent” heart murmurs usually resolve by themselves, but others may require additional treatment.


This condition occurs when the thin sac or membrane that surrounds the heart (pericardium) becomes inflamed or infected. The amount of fluid between its two layers increases, impairing the heart’s ability to pump blood like it should.

Pericarditis may occur after surgery to repair a congenital heart defect, or it may be caused by infections, chest traumas, or connective tissue disorders like lupus. Treatments depend on the severity of the disease, the child’s age, and their overall health.

Rheumatic Heart Disease

When left untreated, the streptococcus bacteria that cause strep throat and scarlet fever can also cause rheumatic heart disease.

This disease can seriously and permanently damage the heart muscle (myocarditis) and the heart valves. According to Seattle Children’s Hospital, rheumatic fever typically occurs in children ages 5 to 15, but usually the symptoms of rheumatic heart disease don’t show up for 10 to 20 years after the original illness.

This disease can be prevented by promptly treating strep throat with antibiotics.

Viral Infections

Viruses, in addition to causing respiratory illness or the flu, can also affect heart health.

Viral infections can cause heart muscle inflammation (myocarditis), which may affect the heart’s ability to pump blood throughout the body. Viral infections of the heart are rare and may show few symptoms. When symptoms do appear, they’re similar to flu-like symptoms, including fatigue, shortness of breath, and chest discomfort. Treatment involves medications and treatments for the symptoms of myocarditis.

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