What Is Adult Congenital Heart Disease? A Complete Guide for Newly Diagnosed Adults

An estimated 1.5 million adults in the United States are living with congenital heart disease.

Most of them don't have a specialist.

That's not a minor gap in care. It's the central problem in this field — and it's the reason practices like this one exist.

If you've recently been told you have adult congenital heart disease (ACHD), or if you've known since childhood and never made the move to adult-focused cardiac care, this guide is for you. No jargon walls. No false reassurance. Just a clear account of what ACHD is, what it means for your health, and what the right care actually looks like.

What Is Congenital Heart Disease?

Congenital means present at birth. Congenital heart disease (CHD) refers to structural abnormalities in the heart that develop before birth — problems with how the chambers formed, how the valves are shaped, how the great vessels are connected.

These aren't rare defects. CHD is the most common birth defect in the world. Roughly 1 in 100 babies is born with some form of it.

The range is wide. Some defects are minor — a small hole between chambers that may close on its own or require only observation. Others are complex — malformed valves, reversed vessels, single-ventricle anatomy — conditions that required surgery in infancy just to survive and require expert management for life.

The heart you were born with is structurally different. That distinction doesn't disappear when you turn 18.

So What Is Adult Congenital Heart Disease?

Adult congenital heart disease (ACHD) is the subspecialty of cardiology devoted to caring for people who were born with CHD and are now adults.

This is a newer field than most people realize. For most of medical history, CHD was treated — if at all — as a childhood problem. Survival into adulthood wasn't the expectation. It's now the norm. Thanks to advances in pediatric cardiac surgery over the last 50 years, more than 90% of people born with congenital heart defects now survive into adulthood.

We didn't fully build the adult care system to receive them.

That's changing. ACHD is now a recognized subspecialty with its own board certification. But access to certified ACHD specialists remains limited, unevenly distributed, and often disconnected from the pediatric care that came before it.

The Common Conditions Seen in Adult CHD Care

ACHD is not one condition. It's a category that includes dozens of diagnoses, each with its own anatomy, natural history, and long-term concerns. The most common conditions seen in adult CHD clinics include:

Bicuspid aortic valve (BAV). The most prevalent CHD in adults. Instead of three leaflets, the aortic valve has two — and often stiffens or leaks over time. BAV is also associated with aortic aneurysm, which is why monitoring the aorta is part of the care plan, not just the valve.

Atrial septal defect (ASD) and ventricular septal defect (VSD). Holes between the heart's chambers. Small ones may close naturally or go unnoticed for years. Larger ones that weren't repaired — or were repaired and now have residual effects — require ongoing follow-up.

Tetralogy of Fallot. One of the most common complex CHDs. Most patients had surgery in childhood. As adults, they face potential issues with the pulmonary valve, right ventricular function, and arrhythmias. Long-term surveillance is essential.

Transposition of the great arteries (TGA). The major arteries are switched. Most patients born with this underwent an arterial switch operation as newborns. Adults who had the older procedure (atrial switch, or "Mustard/Senning") face a unique set of challenges as their systemic right ventricle ages.

Fontan circulation. One of the most complex anatomical situations in ACHD. Patients with a single functional ventricle who underwent the Fontan procedure in childhood now reach adulthood with circulation that works differently from anything else in cardiology. Heart failure, liver disease, protein-losing enteropathy, and arrhythmias are all part of the picture.

Ebstein anomaly, coarctation of the aorta, pulmonary stenosis, and others. Each with its own concerns and management approach.

ACHD is not a single disease with a single protocol. It requires a cardiologist who understands your specific anatomy and the surgical history behind it.

Why Adults with CHD Need Specialized Care

General cardiologists are trained for acquired heart disease — the kind that develops over a lifetime through atherosclerosis, hypertension, valve degeneration. They are excellent at what they do. But congenital anatomy is different from the beginning.

A patient with repaired Tetralogy of Fallot doesn't have the same right ventricular physiology as someone with pulmonary hypertension from another cause. A patient post-Fontan doesn't have the same hemodynamics as anyone with two normal ventricles. These distinctions determine how to read an echocardiogram, interpret a symptom, and decide whether a medication is appropriate.

ACHD specialists are trained specifically in this anatomy. They understand what "normal" looks like after your repair — and they know when something has shifted.

What Changes as You Get Older with CHD

The heart you were born with may have been well-managed in childhood. But congenital hearts age. Repairs made in infancy or childhood weren't designed to last forever without follow-up. Residual lesions can progress. Valve function changes. Arrhythmias emerge. The right ventricle, often the more stressed chamber in complex CHD, can decline.

Common adult concerns include:

• Arrhythmias — atrial fibrillation and flutter are significantly more common in adults with CHD than in the general population
• Heart failure — both right and left ventricular failure occur in this population, often for reasons distinct from typical heart failure
• Pulmonary hypertension — elevated pressure in the pulmonary circulation complicates many forms of CHD
• Endocarditis risk — certain structural abnormalities carry elevated infection risk
• Aortic complications — dilation and aneurysm are concerns in conditions like bicuspid aortic valve and aortic coarctation
• Pregnancy — for women with CHD, pregnancy requires specialized co-management because even well-repaired hearts face added hemodynamic demand

None of these are inevitable. Most are manageable with the right surveillance and care plan. But managing them requires a cardiologist who is watching for the right things in the right way.

What Does ACHD Care Actually Look Like?

ACHD care is not a specialty visit once and then back to your primary care doctor. It's a relationship — a long-term management plan that adapts as your heart and your life change.

At a minimum, it involves:

• Regular echocardiography — typically every one to three years depending on your anatomy and history
• Cardiac MRI — particularly important for right ventricular function, Fontan circulation, and aortic surveillance
• Rhythm monitoring — Holter monitors, event monitors, or implantable loop recorders for patients with arrhythmia history
• Exercise testing — functional assessment to track capacity and cardiopulmonary reserve
• Transition planning and handoff documentation — a clear record of your anatomy, surgical history, and current status that follows you through the healthcare system

The frequency and composition of that surveillance is individualized. Complex anatomy requires more frequent follow-up. Simpler defects may be managed less intensively. What matters is that someone with the right training is making that determination — not leaving it to chance.

When to See an ACHD Specialist

If you have any history of congenital heart disease — even if you were told as a child that your defect was "minor" or "closed" or "fixed" — you should have an ACHD evaluation.

"Fixed" in pediatric cardiology often means the acute problem was addressed. It doesn't mean the work is done. Repaired hearts still need monitoring. Even small defects can leave residual effects that matter in adulthood.

If you haven't seen a cardiologist specifically trained in adult congenital heart disease, now is the time to establish that care. Not when something goes wrong — before it does.

What We Do at Congenital Heart Compass

Congenital Heart Compass Medical PLLC was founded specifically to close the access gap in ACHD care for patients in Rochester, Western New York, and the surrounding region.

Dr. Pradeepkumar Charla is board-certified in adult congenital heart disease and sees patients across the full spectrum of ACHD — from simple defects requiring periodic surveillance to complex single-ventricle anatomy. The practice offers in-person consultation, telemedicine ACHD visits, and shared-care arrangements with referring cardiologists and primary care physicians.

If you're newly diagnosed, returning to care after years away, or looking for a second opinion on your management plan — this is the right starting point.

Schedule a consultation or call our office directly. No referral is required for most consultations; check with your insurance plan for specific requirements.

Dr. Pradeepkumar Charla, MD, MBA is a Pediatric and Adult Congenital Cardiologist and the founder of Congenital Heart Compass Medical PLLC in Rochester, NY. He specializes in lifelong care for adults with congenital heart disease.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult with a qualified healthcare professional regarding your specific condition.