Pediatric cardiology is the branch of medicine focused on diagnosing and treating heart conditions in children, from before birth through young adulthood. It covers everything from heart defects detected on a prenatal ultrasound to rhythm disorders in teenagers. Heart defects are the most common type of birth defect, affecting nearly 1% of births, roughly 40,000 babies per year in the United States, which makes this one of the largest and most active pediatric subspecialties.
Who Pediatric Cardiologists Treat
Pediatric cardiologists care for patients across a wide age range: fetuses still in the womb, newborns, children, adolescents, and sometimes adults over 18 who were born with heart conditions. The field begins before birth because many heart problems can now be identified through fetal imaging, giving families and surgical teams time to plan. On the other end, some patients with congenital heart disease continue seeing pediatric cardiologists well into adulthood, particularly when their condition is complex and their cardiologist has managed it since childhood.
Common Conditions
The conditions pediatric cardiologists manage fall into two broad categories: congenital (present at birth) and acquired (developing later in childhood).
Congenital heart defects make up the bulk of the caseload. These are structural problems with the heart that form during fetal development. Some are relatively straightforward, like a ventricular septal defect (a hole between the heart’s lower chambers) or an atrial septal defect (a hole between the upper chambers). Others are far more complex and life-threatening. About 1 in 4 babies born with a heart defect has what’s classified as a critical defect, meaning it requires surgery or a catheter-based procedure within the first year of life. Critical defects include conditions like hypoplastic left heart syndrome, where one side of the heart is severely underdeveloped, and tetralogy of Fallot, a combination of four structural abnormalities that reduces oxygen flow to the body.
Acquired heart conditions include problems that develop after birth, such as Kawasaki disease (which can damage the coronary arteries), heart muscle diseases called cardiomyopathies, and abnormal heart rhythms. Pediatric cardiologists also evaluate children who faint during exercise, have chest pain, or are found to have a heart murmur during a routine checkup.
Signs Parents Should Watch For
In newborns and infants, the most recognizable sign of a heart problem is cyanosis, a pale gray or bluish tint to the skin that signals low oxygen levels. Rapid breathing is another common symptom, especially during feedings. Babies with significant heart defects often struggle to eat because the effort of feeding pushes their heart to work harder, leading to shortness of breath and poor weight gain. Swelling in the legs, belly, or around the eyes can also point to a heart that isn’t pumping efficiently.
In older children, the signs look different. Getting unusually short of breath or tired during exercise, fainting during physical activity, or developing swelling in the hands, ankles, or feet are all reasons a pediatrician might refer a child for cardiac evaluation. Many heart conditions, though, are caught earlier through a routine finding like a heart murmur, an abnormal heart sound your pediatrician picks up with a stethoscope.
How Heart Problems Are Diagnosed
The most commonly used tool in pediatric cardiology is echocardiography, essentially an ultrasound of the heart. It’s painless, doesn’t involve radiation, and gives cardiologists a detailed view of the heart’s structure and how well it’s pumping. Echocardiography can be performed on patients of any age, including fetuses, through the mother’s abdomen. Newer techniques like strain imaging and three-dimensional echocardiography allow even more precise measurements of heart function.
Beyond echo, pediatric cardiologists use electrocardiograms (EKGs) to assess the heart’s electrical activity, cardiac MRI for detailed images of heart tissue without radiation, and cardiac CT when fast, high-resolution images of the coronary arteries or other structures are needed. CT technology has improved significantly in recent years, with better image quality at much lower radiation doses. Fetal cardiac MRI is a newer option that allows detailed structural and functional assessment of a baby’s heart before birth, sometimes catching problems that standard fetal ultrasound misses.
Treatment Options
Treatment depends entirely on the type and severity of the condition. Some small holes in the heart close on their own over time and only need monitoring. Others require intervention.
Over the past two decades, catheter-based procedures have transformed the field, allowing many defects to be treated without open-heart surgery. In these procedures, a thin tube is threaded through a blood vessel in the groin or neck to reach the heart. From there, cardiologists can perform a range of repairs. Balloon valvuloplasty uses an inflatable balloon to stretch open a narrowed heart valve, most commonly the valve leading to the lungs or the main valve leading to the body. Angioplasty works similarly but targets narrowed blood vessels. When a vessel won’t stay open after being stretched, a stent, a small metal mesh tube, can be placed inside it to hold it open permanently. In some cases, a procedure called septostomy creates or enlarges a hole between the heart’s upper chambers to improve blood flow.
For more complex defects, open-heart surgery remains necessary. Some children need a single operation, while others require a series of staged surgeries over their first few years of life. In the most severe cases, heart transplantation is an option. Survival rates after transplant have improved considerably thanks to better monitoring, refined surgical techniques, and improved care for high-risk patients with complicating factors like antibodies or other health conditions.
Gene therapy is one of the newest frontiers. The first gene therapies for certain heart muscle diseases were developed in 2020, and some have recently been expanded for use in pediatric patients. Ventricular assist devices, mechanical pumps that help a weakened heart circulate blood, have also become a major advance, serving as a bridge to transplant or sometimes as a longer-term solution.
Subspecialties Within the Field
Pediatric cardiology itself contains several focused areas. Electrophysiology deals with heart rhythm disorders. Interventional cardiology covers catheter-based procedures. Fetal cardiology specializes in diagnosing and planning for heart conditions before birth. Other subspecialties include cardiac imaging (echo, MRI, and CT), heart failure and transplantation, pulmonary hypertension, intensive cardiac care, exercise physiology, preventive cardiology, and adult congenital heart disease, which focuses on grown patients still living with conditions they were born with.
Transitioning to Adult Care
Children born with heart defects don’t outgrow them. Most will need some level of cardiac follow-up for life. The shift from pediatric to adult care is a process, not a single event. Experts recommend beginning transition planning in early adolescence, gradually building the young patient’s understanding of their condition, medications, and how to navigate the healthcare system independently. The formal transfer of care, when a patient officially moves to an adult congenital heart disease specialist, typically happens in the late teens or early twenties, but the groundwork should be laid years earlier.
Training of a Pediatric Cardiologist
Becoming a pediatric cardiologist requires extensive training. After completing medical school, a physician must finish a full pediatric residency, then a three-year fellowship specifically in pediatric cardiology. Many pursue additional training in a subspecialty like electrophysiology or interventional cardiology after that. From start to finish, the process typically takes over a decade of education and clinical training beyond college.