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Congenital Heart Defects in Adults (ACHD)
Epidemiology
More adults than children now live with congenital heart disease (CHD) in the United States. An estimated 2.4 million Americans currently have CHD, and two thirds of them are adults. Overall adult prevalence is 3-4 per 1,000. Nearly 300,000 people have severe CHD (two or more combined abnormalities, often with cyanosis at birth). Survival to adulthood has been driven by advances in pediatric surgery, catheter-based interventions, and intensive care.
Lesion frequencies in adults:
| Lesion | Frequency |
|---|---|
| Bicuspid aortic valve | ~2% of general population; most common ACHD lesion |
| Atrial septal defect (ASD) | 30-40% of CHD cases in adults |
| Ventricular septal defect (VSD) | 15-20% of all congenital lesions |
| Patent ductus arteriosus (PDA) | 5-10% of congenital lesions |
| Pulmonary stenosis / Coarctation | 3-10% each |
| Tetralogy of Fallot (TOF) | Most common cyanotic CHD in adults |
| Complex lesions (tricuspid atresia, Ebstein, ccTGA, etc.) | ~2.5% each |
- Goldman-Cecil Medicine, Ch. 55
Genetic Associations
About 20% of CHD cases are linked to a chromosomal syndrome:
- Down syndrome (trisomy 21): 50% have endocardial cushion or VSD defects
- Trisomy 13 and 18: VSD in ~90%
- Turner syndrome (45,X): Aortic coarctation, aortic stenosis, ASD
- 22q11 deletion (DiGeorge/CATCH-22): ~15% of TOF cases; also truncus arteriosus, interrupted aortic arch
- Single-gene syndromes: Marfan (aortic root), Williams (supravalvular aortic stenosis), Noonan (pulmonary stenosis, HCM), VACTERL
Major Lesions and Their Management in Adults
1. Atrial Septal Defect (ASD)
Types: Ostium secundum (most common), ostium primum (part of AV canal), sinus venosus (associated with anomalous pulmonary venous return), coronary sinus ASD.
Adult complications:
- Right heart volume overload causing RV dilation and eventual failure
- Atrial fibrillation/flutter (from chronic atrial stretch)
- Pulmonary hypertension - unusual before age 20 but present in 50% by age 40; overall 15-20% develop pulmonary vascular obstructive disease
- Paradoxical embolism and stroke
- Mitral valve disease in up to 15% of patients over 50 years
Management: Closure (percutaneous device or surgical) is indicated when pulmonary:systemic flow ratio (Qp:Qs) > 1.5:1 with evidence of RV volume overload, provided pulmonary vascular resistance is not prohibitively elevated (< 2/3 systemic). Percutaneous closure with an Amplatzer-type device is the standard for suitable secundum ASDs. Sinus venosus defects require surgical repair.
2. Ventricular Septal Defect (VSD)
Most VSDs close spontaneously in childhood; adults with persistent VSDs usually have small lesions or were operated previously. Adults with large unrepaired VSDs often have Eisenmenger physiology. Small restrictive VSDs carry a low risk of Eisenmenger but a persistent risk of infective endocarditis (IE). Closure is indicated when Qp:Qs > 1.5:1 with LV volume overload, or when there is progressive aortic valve prolapse causing aortic regurgitation.
3. Patent Ductus Arteriosus (PDA)
In adults, a small PDA may be asymptomatic. A large PDA leads to pulmonary hypertension and eventually Eisenmenger physiology. Device closure is indicated for all significant PDAs. Even small PDAs are typically closed due to IE risk, though guidelines have modified this position for truly silent PDAs.
4. Coarctation of the Aorta
Clinical features in adults: Systemic hypertension (often refractory), differential BP between upper and lower extremities, notching of inferior rib margins on chest X-ray (from intercostal collateral vessels), risk of aortic aneurysm and rupture, intracranial aneurysms (Berry aneurysms in circle of Willis).
Management: Balloon angioplasty with stenting is preferred for native coarctation in adults; surgical repair for anatomy unsuitable for catheter intervention. Hypertension frequently persists even after repair and requires lifelong treatment. Associated bicuspid aortic valve occurs in ~85% of cases.
5. Pulmonary Stenosis
- 25-year survival > 95% for isolated valvular pulmonary stenosis
- Mild (<50 mmHg) to moderate (50-80 mmHg): generally excellent prognosis
- Treatment: Percutaneous balloon valvotomy for mean Doppler gradient ≥ 30 mmHg in patients with doming valves; excellent results at 10-year follow-up. Transcatheter pulmonary valve replacement (e.g., Melody or Sapien) for failed bioprosthesis or RVOT conduit dysfunction.
6. Tetralogy of Fallot (TOF)
The most common cyanotic CHD surviving to adulthood. Classic anatomy: large subaortic VSD, RVOT obstruction (infundibular + valvular), overriding aorta, RV hypertrophy.
After repair in adults:
- Pulmonary regurgitation (PR) is near-universal after transannular patch repair - leads to progressive RV dilation and dysfunction
- Pulmonary valve replacement (PVR) is required when severe PR causes symptomatic RV dilation or dysfunction; timing is an active area of management debate
- Ventricular tachycardia and sudden cardiac death - major late risk; ICD may be required
- Right bundle branch block is expected on ECG post-repair; QRS duration > 180 ms is a risk factor for sudden death
- Residual VSD, branch PA stenosis, infundibular obstruction can all persist
7. Transposition of the Great Arteries (TGA)
- D-TGA (complete transposition): Adults who underwent Mustard or Senning atrial-level baffle repair in the 1970s-80s now present with systemic RV failure, baffle obstruction/leaks, and arrhythmias. Arterial switch operation (now the standard repair for neonates) produces better long-term outcomes.
- Congenitally Corrected TGA (ccTGA): Atrioventricular and ventriculo-arterial discordance - the morphologic RV handles systemic work and fails by the 5th-6th decade. Associated with complete heart block (progressive, ~2% per year), systemic AV valve (tricuspid) regurgitation, and arrhythmias.
8. Ebstein Anomaly of the Tricuspid Valve
- Apical displacement of the tricuspid valve; "atrialized" RV portion; regurgitant valve
- Clinical presentation: "sail sound" on S1; highly peaked P waves + wide bizarre QRS on ECG
- Preexcitation (WPW) in ~20%; supraventricular arrhythmias including AF/AFL in 30-40%
- ASD/PFO present in > 50% - risk of right-to-left shunting and cyanosis
- Predicted 50% mortality by the 4th-5th decade (when all ages are pooled)
- Surgery (tricuspid valve repair preferred over replacement + ASD closure) is indicated for worsening functional status, cyanosis, arrhythmia, or stroke
9. Fontan Circulation (Single Ventricle)
Adults with tricuspid atresia, hypoplastic left heart, or other univentricular hearts who have undergone Fontan palliation have passive pulmonary blood flow driven entirely by systemic venous pressure. Long-term complications are significant:
- Fontan-associated liver disease (FALD): Progressive hepatic congestion, fibrosis, and hepatocellular carcinoma risk
- Protein-losing enteropathy (PLE)
- Plastic bronchitis
- Atrial arrhythmias
- Thromboembolic events
- Progressive single ventricle failure
10. Eisenmenger Syndrome
Eisenmenger syndrome is the end-stage of any large, unrepaired left-to-right shunt in which pulmonary vascular resistance becomes suprasystemic, reversing the shunt to right-to-left with resultant cyanosis.
Complications:
- Erythrocytosis (compensatory) - hyperviscosity symptoms when hematocrit > 65%
- Iron deficiency (from phlebotomy or poor absorption) - worsens stroke risk by increasing viscous deformability
- Paradoxical embolism and stroke
- Hemoptysis (from pulmonary infarction or rupture of dilated pulmonary vessels)
- Gallstones (from chronic hemolysis and bilirubin)
- Gout (from increased uric acid turnover)
- Coagulopathy - both bleeding and thrombotic tendency
- IE risk
Management:
- Pulmonary arterial hypertension (PAH)-targeted therapy: endothelin receptor antagonists (bosentan, ambrisentan), PDE-5 inhibitors (sildenafil, tadalafil), and prostanoids improve functional status and may slow progression
- Phlebotomy only for symptomatic hyperviscosity (Hct > 65%) with iron replacement to maintain normal RBC deformability
- Heart-lung or heart-lung-repair transplantation for eligible patients
- Pregnancy carries ~50% maternal mortality and is contraindicated
Common Cross-Cutting Complications in ACHD
| Complication | Key Points |
|---|---|
| Arrhythmias | AF, flutter, VT are common after repair; related to atrial scars, elevated pressures, and prior ventriculotomy |
| Heart failure | Right or left ventricular failure depending on anatomy; systemic RV failure is a major challenge in ccTGA and post-Mustard TGA |
| Infective endocarditis | Risk is highest in complex cyanotic CHD, prosthetic valves, and residual shunts; AHA recommends prophylaxis for high-risk lesions |
| Pulmonary hypertension | May develop after any repaired/unrepaired shunt; PAH-targeted therapy has transformed outcomes |
| Sudden cardiac death | Most common in repaired TOF; ICD implantation considered for high-risk patients |
| Pregnancy | Requires specialized ACHD center management; Marfan, severe outflow obstruction, Eisenmenger, and Fontan carry highest maternal risk |
Exercise and Lifestyle
Exercise is generally beneficial for most ACHD patients and should be encouraged. A 2025 AHA/ACC guideline (see below) includes updated exercise recommendations for adults with CHD. Patients with simple lesions (small VSDs, mild PS, repaired ASD) can typically engage in full competitive sports. Patients with moderate-severe lesions require individualized assessment.
Care Setting
Adults with CHD benefit from care at ACHD-specialized centers with cardiologists who have training in adult congenital disease, in collaboration with cardiac surgeons, electrophysiologists, and reproductive medicine specialists. The 2025 ACC/AHA/HRS/ISACHD/SCAI guideline (PMID 41411480) updates recommendations across all major ACHD topics including mental health, physical activity, pregnancy, and specific lesion management.
2025 Guideline update: The 2025 ACC/AHA guideline for ACHD (published February 2026) supersedes the 2018 guideline. New additions include mental health screening, transition of care from adolescence to adulthood, updated heart failure management, and expanded transcatheter intervention recommendations (PMID: 41411480).
Sources: Goldman-Cecil Medicine, Ch. 55 (Therrien & Marelli); Braunwald's Heart Disease, 12th ed., Ch. 82; 2025 ACC/AHA/HRS/ISACHD/SCAI Guideline (PMID 41411480)
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