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In North America today, there are now more adults living with congenital heart disease than children. This reversal is the result of steady progress in medical and surgical techniques over recent decades. Previously, many congenital heart defects—those present at birth—led to early mortality, but advances in pediatric cardiology and cardiac surgery have dramatically changed this. Survival rates for children born with even complex heart conditions have improved so much that the landscape of care now features a growing adult population whose medical needs look very different from those of pediatric patients.
In recent years, ongoing improvements in both diagnosis and intervention have continued to increase the number of adults with congenital heart disease. This means that what was once a concern mainly for pediatric specialists has become a major focus for adult medicine as well. The shift has created new demands on healthcare systems, as adults with congenital heart disease often require lifelong and highly specialized care that differs from the management of acquired heart disease in the general population.
Congenital heart defects are a collection of structural abnormalities affecting the development of the heart. These defects range from simple forms, such as a small hole between heart chambers, to severe malformations that disrupt normal blood flow or oxygenation and often require surgical intervention in early childhood. While some individuals may carry mild forms with few or no symptoms, others experience significant health challenges throughout life.
One of the ongoing concerns for adults with congenital heart disease is the presence of cardiovascular residua—the anatomical or physiological changes that persist even after initial surgery or intervention. These can include arrhythmias, residual shunts, or valve dysfunction. In addition to these cardiac issues, adults may also develop endocarditis, an infection of the heart's inner lining, which is a recognized risk due to abnormal blood flow patterns or the presence of prosthetic material from previous surgeries.
End-organ dysfunction is another prominent health challenge. Long-standing changes in heart function can gradually impair the function of organs such as the liver or kidneys. For example, patients with cyanotic heart disease may experience chronic low oxygen levels, which can contribute to complications including erythrocytosis, kidney dysfunction, or even brain abscess. These secondary complications mean that patients require careful and ongoing surveillance well into adulthood.
The spectrum of congenital heart defects also influences the clinical course and management needs of affected adults. Simple defects may require only periodic checks, but severe congenital heart disease—such as those requiring the Fontan procedure for single-ventricle physiology—leaves patients at higher risk for complications. The Fontan procedure, which routes blood directly to the lungs bypassing part of the heart, carries a significant long-term risk for liver disease, including hepatic fibrosis and cirrhosis.
Because of these complexities, guidelines recommend that adults with congenital heart disease receive periodic follow-up with a multidisciplinary medical team. This team typically includes an internal medicine physician as well as a cardiologist who is specifically trained in the management of adult congenital heart disease. The need for specialized, lifelong care is heightened for those with complex congenital conditions, for patients who continue to experience symptoms, for those with end-organ dysfunction, and for women planning a pregnancy.
The frequency of follow-up for adults with congenital heart disease is not one-size-fits-all. It is determined by the specific type of heart defect, the status of any surgical repairs, and the current clinical condition of the patient. For example, someone with a small, asymptomatic defect may only need visits every few years, while those with complex anatomy, residual lesions, arrhythmias, or heart failure may require much more frequent monitoring and intervention.
For adults with complex or symptomatic disease, multidisciplinary care can involve not just cardiology and internal medicine, but also specialists in hepatology, nephrology, and maternal-fetal medicine. This is particularly true for women with congenital heart disease who are considering pregnancy. Pregnancy can pose significant risks, including the potential for heart failure, arrhythmia, or end-organ decompensation, and careful preconception counseling is recommended to ensure that risks are understood and optimized before conception.
Another key aspect of care for adults with congenital heart disease is the management of infectious disease risks. Adults with congenital heart disease, particularly those who underwent open heart surgery before 1992, are at increased risk for hepatitis C infection. Before the implementation of routine blood screening in 1992 in the United States, blood transfusions and operative procedures carried a higher likelihood of transmitting hepatitis C. Individuals who had surgery during that era may have been unknowingly exposed to the virus, which can remain asymptomatic for years but ultimately leads to chronic liver disease.
Recognizing these risks, the Centers for Disease Control and Prevention (CDC) has issued guidelines recommending universal hepatitis C screening for all adults with congenital heart disease who are between 19 and 59 years old and who have not previously been screened. In addition, hepatitis B vaccination is recommended for all nonimmune adults in this age group, as hepatitis B can also pose increased risks in patients with underlying heart or liver issues.
Patients who have undergone the Fontan procedure are at particularly high risk for liver complications, including those related to chronic viral hepatitis. For these individuals, the CDC recommends not only vaccination for hepatitis A and B, but also post-vaccination testing to confirm that immunity has been achieved. If post-vaccination testing shows a lack of immunity, repeat vaccination is advised, as persistent susceptibility can leave these patients vulnerable to severe liver disease.
The hepatitis C landscape changed significantly in 1992 with the introduction of blood screening, which sharply reduced the risk of acquiring the infection from transfusions or operative procedures. Before that, patients with congenital heart disease who required surgery were at the mercy of blood supplies that could not be screened for hepatitis C. The long-term consequences of infection can include cirrhosis, liver cancer, and the need for transplantation—complications that add further complexity to the care of adults with congenital heart disease.
Vaccination practices extend beyond hepatitis. Pneumococcal vaccination is also advised for adults with congenital heart disease, especially those with additional risk factors like asplenia or right atrial isomerism—a condition that affects spleen function. Some congenital heart defects, including pulmonary atresia, truncus arteriosus, and tetralogy of Fallot, have an association with genetic disorders such as the 22q11 deletion, also known as the DiGeorge spectrum. Patients with this genetic abnormality should receive pneumococcal vaccination to reduce their risk for invasive bacterial infections.
In addition to physical health concerns, adults with congenital heart disease experience high rates of anxiety and depression. These mood disorders are often underrecognized but can have a significant impact on overall health and quality of life. Routine screening for mental health issues is becoming an increasingly important part of comprehensive care for this population.
Finally, reproductive health counseling is a crucial component of lifelong management. Decisions about contraception and pregnancy require a careful balancing of risks and benefits, particularly for those with a history of thromboembolic disease, mechanical valves, cyanosis, or pulmonary arterial hypertension. Estrogen-containing contraceptives may increase the risk of blood clots in some patients, and anticoagulation during pregnancy carries its own set of risks for both mother and fetus.
The CDC’s guidance for hepatitis B vaccination and hepatitis C screening in nonimmune patients aged 19 through 59 years with congenital heart disease specifically targets this growing adult population, recognizing that their care needs are distinct from those of children or adults with acquired heart conditions.