congenital heart defects in adults

Reading File

Now let me search the library and PubMed in parallel.

Finding Sources

Searching PubMed

"congenital heart disease" AND "adults"[MeSH Terms]

Searching the Web

congenital heart defects adults management 2024 2025 guidelines

Good. Now let me read the main textbook section and pull more detailed content in parallel.

Reading File

Finding Sources

Searching PubMed

"congenital heart disease" AND "adults"

Excellent. Now let me read more of the Goldman-Cecil chapter on ACHD - covering specific lesions and management.

Reading File

Finding Sources

Let me read the core ACHD content from Goldman-Cecil covering specific defects and management.

Reading File

It seems the file jumped to references. Let me find the actual ACHD clinical content (lesion descriptions, management) which should be further in the block.

Finding Sources

Let me read the full ACHD chapter from Goldman-Cecil (the main section at line 756 onwards, finding the clinical content) and Braunwald's specific defects section in parallel.

Reading File

Let me read more of the Goldman-Cecil content that covers specific lesions and their management in adults.

Reading File

Excellent content. I now have very rich material. Let me read the next section covering VSD, PDA, coarctation, TOF, and Eisenmenger.

Reading File

I have a wealth of material. Let me read one more section covering Eisenmenger, TOF, complex lesions and complications.

Reading File

I now have comprehensive material. Let me compile the full answer.

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)

explain all types

Reading File

Finding Sources

Searching the Web

types of congenital heart defects complete classification acyanotic cyanotic 2025

Reading File

Finding Sources

Reading File

I now have all the content I need. Let me also quickly get the TOF and TGA sections and then compile the full comprehensive response.

Finding Sources

Reading File

I now have all the textbook content needed. Let me compile the comprehensive, organized explanation of all CHD types.Here is a complete, structured explanation of all types of congenital heart defects (CHD), organized by the standard clinical classification system.

All Types of Congenital Heart Defects - Complete Guide

Classification Overview

CHD is broadly divided into two major categories based on whether unoxygenated blood reaches the systemic circulation:

CONGENITAL HEART DEFECTS
├── ACYANOTIC (no right-to-left shunt)
│   ├── Left-to-Right Shunts (volume overload)
│   │   ├── Atrial Septal Defect (ASD)
│   │   ├── Ventricular Septal Defect (VSD)
│   │   ├── Patent Ductus Arteriosus (PDA)
│   │   ├── Atrioventricular Septal Defect (AVSD)
│   │   └── Anomalous Pulmonary Venous Return (APVR)
│   └── Obstructive Lesions (pressure overload, no shunt)
│       ├── Pulmonary Stenosis (PS)
│       ├── Aortic Stenosis (congenital AS, bicuspid AV, subaortic, supravalvular)
│       └── Coarctation of the Aorta
├── CYANOTIC (right-to-left or bidirectional shunt)
│   ├── Decreased Pulmonary Blood Flow
│   │   ├── Tetralogy of Fallot (TOF)
│   │   ├── Tricuspid Atresia
│   │   └── Pulmonary Atresia
│   ├── Increased Pulmonary Blood Flow
│   │   ├── Transposition of the Great Arteries (D-TGA)
│   │   ├── Total Anomalous Pulmonary Venous Return (TAPVR)
│   │   ├── Truncus Arteriosus
│   │   └── Hypoplastic Left Heart Syndrome (HLHS)
│   └── Mixed / Complex
│       ├── Ebstein Anomaly
│       ├── Congenitally Corrected TGA (ccTGA)
│       ├── Double Outlet Right Ventricle (DORV)
│       └── Single Ventricle / Fontan circulation
└── EISENMENGER SYNDROME (end-stage any shunt → right-to-left)

PART 1: ACYANOTIC DEFECTS - LEFT-TO-RIGHT SHUNTS

These defects cause oxygenated blood to recirculate through the lungs (left side pumps blood back to right side). The result is volume overload of the pulmonary circulation and right heart. If uncorrected for decades, pulmonary hypertension eventually reverses the shunt (Eisenmenger syndrome).

1. Atrial Septal Defect (ASD)

What it is: A hole in the interatrial septum allowing blood to pass from the left atrium to the right atrium.

Subtypes (by anatomic location):

Type	Location	Notes
Ostium secundum	Central fossa ovalis	Most common (70%); amenable to device closure
Ostium primum	Lower atrial septum (endocardial cushion)	Part of AV canal; always has cleft mitral valve
Sinus venosus	High septum, near SVC/IVC junction	Associated with anomalous pulmonary venous drainage
Coronary sinus ASD	Coronary sinus orifice	Rarest; associated with left-sided SVC

Special combination: Secundum ASD + acquired mitral stenosis = Lutembacher syndrome (mitral stenosis diverts more blood left-to-right, worsening the shunt).

Patent Foramen Ovale (PFO): A probe-patent flap that was never fused; present in ~25% of adults. Not a true ASD but clinically significant as a route for paradoxical embolism (cryptogenic stroke in young adults).

Pathophysiology:

Qp:Qs > 1.5:1 leads to right atrial and RV dilation
Pulmonary hypertension unusual before age 20; present in 50% by age 40
Eisenmenger syndrome occurs in only 5-10% of isolated secundum ASDs
AF/flutter from chronic right atrial stretch
Mitral valve disease in up to 15% over age 50

Clinical findings:

Fixed, wide splitting of S2 (hallmark - the split doesn't vary with breathing)
Soft systolic ejection murmur (pulmonary flow murmur at left upper sternal border)
Mid-diastolic rumble across the tricuspid valve when Qp:Qs > 2:1
ECG: right axis deviation, incomplete RBBB (rsR' in V1), right atrial enlargement
CXR: cardiomegaly, plethoric lung fields, prominent pulmonary artery

Management:

Closure indicated when Qp:Qs > 1.5:1 with RV volume overload
Percutaneous device closure (Amplatzer occluder) - first-line for secundum ASD up to ~40 mm with adequate rim
Surgical closure - for primum, sinus venosus, coronary sinus ASDs, or anatomy unsuitable for device
PFO closure - recommended after cryptogenic stroke in patients aged < 60 with high-risk PFO anatomy

2. Ventricular Septal Defect (VSD)

What it is: A hole in the interventricular septum. The most common CHD in children, but many close spontaneously, making it less common in adults.

Subtypes:

Type	Location	Features
Perimembranous	Membranous septum near AV valves	Most common (~80%); risk of aortic valve prolapse causing AR
Muscular	Body of muscular septum	Often multiple ("Swiss cheese"); highest spontaneous closure rate
Outlet (supracristal/doubly committed)	Below both semilunar valves	Risk of aortic valve cusp prolapse and AR; common in Asians
Inlet (AV canal type)	Near AV valves	Associated with Down syndrome

Pathophysiology:

Small (restrictive) VSD: high-velocity jet, loud murmur (Roger's murmur - harsh pansystolic at LSB), low hemodynamic impact, IE risk
Large (non-restrictive) VSD: equalizes pressures, leads to LV volume overload, pulmonary hypertension, eventually Eisenmenger (by 1st decade in large VSDs)

Clinical:

Pansystolic murmur at left sternal border (louder with smaller defects)
Apical diastolic rumble (increased mitral flow) in large VSDs
ECG: LVH in volume overload; biventricular hypertrophy in large VSDs
Aortic regurgitation is a key complication of outlet and perimembranous VSDs (due to cusp prolapse)

Management:

Closure when Qp:Qs > 1.5:1 with LV volume overload, or any VSD with progressive AR
Percutaneous device closure for muscular VSDs; surgical for perimembranous and outlet types
Eisenmenger VSD: inoperable; PAH-targeted therapy

3. Patent Ductus Arteriosus (PDA)

What it is: Persistent connection between the descending aorta (just distal to left subclavian artery) and the left pulmonary artery - a fetal structure that normally closes within hours-days of birth.

Pathophysiology:

Blood shunts aorta → pulmonary artery throughout the cardiac cycle (both systole and diastole)
LV volume overload, pulmonary hypertension
Large PDAs → Eisenmenger syndrome within the first decade (rapid because pulmonary bed faces systemic pressures)

Clinical:

Continuous "machinery" murmur at left infraclavicular area/upper left sternal border - the classic finding
Wide pulse pressure, bounding pulses (diastolic runoff)
ECG: LVH; CXR: cardiomegaly, pulmonary plethora
In Eisenmenger PDA: differential cyanosis - feet and toes are cyanosed and clubbed, but upper extremities are normal (desaturated blood enters aorta distal to subclavian)

Management:

Device closure (Amplatzer Duct Occluder or coils) for all significant PDAs in adults
Even small/silent PDAs are generally closed due to IE risk
Eisenmenger PDA: PAH-targeted therapy; heart-lung transplant in selected cases

4. Atrioventricular Septal Defect (AVSD) / Atrioventricular Canal Defect

What it is: A defect of the endocardial cushions resulting in abnormalities of both the atrial and ventricular septa plus the AV valves. Strongly associated with Down syndrome (trisomy 21).

Subtypes:

Type	Components
Partial AVSD	Ostium primum ASD + cleft anterior leaflet of mitral valve
Transitional AVSD	Primum ASD + small inlet VSD + abnormal AV valves
Complete AVSD	Large primum ASD + inlet VSD + common AV valve (single valve ring)

Pathophysiology:

Partial: hemodynamics of ASD + mitral regurgitation; common to survive to adulthood unrepaired
Complete: massive shunt + AV valve regurgitation → early pulmonary hypertension; unrepaired adults almost invariably have Eisenmenger syndrome

Clinical hallmarks:

ECG: left axis deviation (superior QRS axis) with Q wave in leads I and aVL - virtually pathognomonic
Prolonged PR interval
Echo: "goose-neck" deformity of LVOT (elongated subaortic region)

Management:

Surgical repair: patching the ASD and VSD + reconstruction of AV valves
Residual AV valve regurgitation common after repair; acquired subaortic obstruction can develop post-operatively

5. Anomalous Pulmonary Venous Return (APVR)

What it is: Pulmonary veins drain into systemic veins or right heart instead of the left atrium.

Type	Description
Partial APVR (PAPVR)	Some (not all) pulmonary veins drain anomalously; often associated with sinus venosus ASD
Total APVR (TAPVR)	All pulmonary veins drain anomalously; requires mixing at ASD level to survive

TAPVR subtypes (Darling classification):

Type I - Supracardiac (most common, ~50%): veins drain to vertical vein → left innominate → SVC. "Snowman/figure-of-8" appearance on CXR
Type II - Cardiac (~30%): drains to coronary sinus or right atrium
Type III - Infracardiac (~20%): veins descend through diaphragm to portal vein/ductus venosus; almost always obstructed (medical emergency in neonates)
Type IV - Mixed (~5%): combination of drainage patterns

Adults rarely have TAPVR unrepaired (incompatible with survival without surgery). Adults with PAPVR may be asymptomatic or present similarly to ASD.

PART 2: ACYANOTIC DEFECTS - OBSTRUCTIVE LESIONS

These cause pressure overload without a shunt. Cyanosis does not occur unless the obstruction is extreme or associated with other defects.

6. Congenital Valvular Aortic Stenosis

What it is: Obstruction to LV outflow at the aortic valve level due to a congenitally malformed valve.

Subtypes by valve anatomy:

Type	Prevalence	Features
Bicuspid aortic valve (BAV)	~2% of population; most common CHD lesion overall	Two cusps instead of three; functions normally at birth; progressive stenosis/regurgitation with age; accounts for up to 50% of surgical AS in adults
Unicuspid aortic valve	Rare	Causes severe AS in infants and young adults
Tricuspid dysplastic valve	Uncommon	Thickened, dysplastic cusps

BAV-specific features:

Right-noncoronary fusion is most common
Aortic root/ascending aorta dilation is intrinsic (medial cystic necrosis, same as Marfan) - independent of stenosis severity
Aortic dissection risk: ~8x higher than general population
Associated with Turner syndrome, coarctation, VSD

Clinical findings (AS):

Classic triad: angina, syncope, heart failure
Systolic ejection murmur at right upper sternal border, radiates to carotids
Audible systolic ejection click (early; disappears when valve calcifies)
Pulsus parvus et tardus (slow-rising, low-amplitude carotid pulse) in severe AS
ECG: LVH; Echo: valve area < 1.0 cm² = severe

Subaortic stenosis: Fibromuscular ring or tunnel below the valve; accounts for 15-20% of congenital LVOT obstruction; concomitant AR in 50% from jet lesion damaging aortic cusps; surgical resection indicated for gradient > 50 mmHg or progressive AR.

Supravalvular aortic stenosis: Hourglass narrowing above sinuses; associated with Williams syndrome (elfin facies, hypercalcemia, intellectual disability); early coronary ostial obstruction risk.

Management:

Mild (<25 mmHg gradient): conservative; 20% require intervention over follow-up
Aortic valvuloplasty: young adults (bridge); calcification limits success
SAVR/TAVR: same indications as acquired AS; TAVR increasingly used in adults with CHD
For subaortic stenosis: surgical resection for gradient > 50 mmHg or progressive AR

7. Pulmonary Stenosis (PS)

What it is: Obstruction to RV outflow, most commonly at the pulmonary valve, but can occur at any level.

Levels of obstruction:

Level	Type	Notes
Valvular	Most common (~90%); doming or dysplastic (Noonan) valve	Excellent prognosis; balloon valvotomy curative
Subvalvular (infundibular)	Double-chambered RV (anomalous muscle bands)	Surgical resection required
Supravalvular / branch PA	Main or branch pulmonary artery narrowing	Seen in Noonan, Williams, congenital rubella, post-TOF repair; balloon/stenting

Clinical findings:

Systolic ejection murmur at upper left sternal border
Systolic ejection click (if valve mobile; disappears with dysplastic valve)
Dominant a wave in JVP (noncompliant RV)
Parasternal RV heave
ECG: right axis deviation, RAE, RVH (R > S in V1)
CXR: dilated main PA (post-stenotic), LPA > RPA (jet directed leftward)

Severity classification:

Mild: mean gradient < 30 mmHg (or peak < 50 mmHg)
Moderate: mean 30-50 mmHg
Severe: mean > 50 mmHg

Prognosis: 25-year survival > 95% for isolated valvular PS - one of the most benign CHD lesions.

Management:

Percutaneous balloon valvotomy - treatment of choice for valvular PS with mean gradient ≥ 30 mmHg and doming valve; excellent 10-year outcomes
Transcatheter pulmonary valve replacement (Melody, Sapien) - for failed conduits/bioprostheses
Surgery - for dysplastic valves unresponsive to balloon, subvalvular obstruction, branch PA stenting failures

8. Coarctation of the Aorta

What it is: Discrete narrowing of the aorta, classically just distal to the left subclavian artery at the ligamentum arteriosum. Creates a proximal high-pressure zone and distal low-pressure zone.

Associated defects:

Bicuspid aortic valve (85%)
VSD, PDA
Intracranial berry aneurysms (circle of Willis)
Turner syndrome

Pathophysiology:

Systemic hypertension proximal to the coarctation (upper extremity)
Reduced pressure distal (lower extremity)
Collateral arteries develop over time (intercostal, internal mammary)
LVH, premature coronary disease, aortic aneurysm, dissection

Clinical findings:

Upper extremity hypertension (often refractory)
Blood pressure difference arms > legs (upper > lower by > 10-20 mmHg)
Weak/absent femoral pulses vs. strong brachial pulses
Systolic murmur posteriorly at midthoracic spine (from coarctation)
Continuous murmurs from collateral vessels
Eye grounds: "corkscrew" retinal arteries

Imaging findings:

CXR: "3 sign" (indentation of aorta at coarctation between dilated subclavian above and poststenotic dilation below); rib notching on 3rd-8th ribs posteriorly (from enlarged intercostal arteries)
MRI/CT: best for anatomy
Echo: Doppler gradient across descending aorta

Complications if untreated:

Hypertension and LV failure
Aortic dissection and rupture
Endocarditis/endarteritis
Intracranial aneurysm rupture
Premature coronary artery disease

Management:

Stenting (catheter-based) - first-line for adults
Surgery - if anatomy unsuitable for stenting (long-segment, severe angulation) or associated defects needing repair
50% of patients repaired after age 40 have persistent residual hypertension
Lifelong surveillance (re-coarctation, aneurysm at repair site, BAV, aortic root)

PART 3: CYANOTIC DEFECTS - DECREASED PULMONARY BLOOD FLOW

9. Tetralogy of Fallot (TOF)

What it is: The most common cyanotic CHD in adults. Caused by anterior-superior deviation of the outlet (infundibular) septum, producing four anatomic features.

Classic tetrad:

Large perimembranous VSD (non-restrictive, right-to-left shunting)
RVOT obstruction (infundibular + valvular pulmonary stenosis)
Overriding aorta (sits over VSD)
Right ventricular hypertrophy (secondary to obstruction)

Associated anomalies:

Right aortic arch (25%)
Anomalous left anterior descending from right coronary cusp crossing RVOT (10%)
ASD ("pentalogy of Fallot")
Multiple VSDs, left SVC

In unrepaired adults:

Right-to-left shunt → cyanosis, clubbing, polycythemia
ECG: right axis deviation, RAE, RVH, dominant R in V1
CXR: boot-shaped heart (upturned apex from RVH, concave pulmonary segment from small/absent main PA)
"Tet spells" (hypercyanotic episodes) - rare in adults but described; caused by spasm of infundibulum reducing pulmonary flow further

In repaired adults (major long-term issues):

Pulmonary regurgitation (PR) - nearly universal after transannular patch repair; causes progressive RV dilation and dysfunction over decades
Pulmonary valve replacement (PVR) - indicated for severe PR with RV dilation/dysfunction, reduced exercise capacity, or arrhythmia
Ventricular tachycardia and sudden cardiac death - QRS duration > 180 ms is a major risk factor; ICD implantation considered
Complete RBBB - expected post-repair ECG finding in 80-90%
CXR post-repair: upturned apex with fullness of PA segment (from RVOT enlargement); sternal wires visible

10. Tricuspid Atresia

What it is: Complete absence of the tricuspid valve orifice. The right atrium has no direct connection to the RV. Survival depends on an ASD (for blood to reach left heart) and either a VSD or PDA (for blood to reach lungs).

Classification (by great artery relationship and pulmonary blood flow):

Type I: Normally related great arteries (most common, ~70%)
Type II: D-transposition of great arteries
Type III: L-transposition of great arteries
Each subclassified by pulmonary blood flow (intact ventricular septum, small VSD, large VSD, pulmonary atresia)

Clinical:

Cyanosis from birth
Hypoplastic RV (underfilled)
ECG: left axis deviation (unusual for cyanotic disease - because LV is dominant), RAE, LVH
Adults with tricuspid atresia are all post-Fontan palliation

11. Pulmonary Atresia

What it is: Complete absence of the pulmonary valve/RVOT opening. Survival requires a PDA or bronchopulmonary collateral vessels (aortopulmonary collaterals, MAPCAs).

Two major forms:

PA with intact ventricular septum (PA-IVS): Hypoplastic RV; depends on PDA; requires intervention in neonatal period; RV-to-coronary sinusoidal connections can cause "RV-dependent coronary circulation"
PA with VSD (PA-VSD): Essentially extreme tetralogy of Fallot; lungs supplied by MAPCAs; more amenable to staged repair or unifocalization

Adults surviving have undergone complex surgical palliation or repair. Residual lesions are common.

PART 4: CYANOTIC DEFECTS - INCREASED PULMONARY BLOOD FLOW

12. D-Transposition of the Great Arteries (D-TGA)

What it is: The aorta arises from the morphologic RV (anteriorly) and the pulmonary artery from the LV (posteriorly). The two circulations run in parallel rather than in series - incompatible with life unless there is mixing (via ASD, VSD, or PDA).

Historical surgical repairs adults now present with:

Repair	Era	Mechanism	Adult Issues
Mustard/Senning (atrial switch)	1960s-1980s	Baffles redirect venous inflow - systemic veins → LV → PA; pulmonary veins → RV → Ao	Systemic RV failure, baffle obstruction/leak, arrhythmias (SSS, AF/flutter, VT), sudden death
Arterial switch (Jatene)	From ~1985 onward	Aorta and PA transected and re-anastomosed to correct ventricles; coronaries reimplanted	Neopulmonary artery stenosis, coronary ostial stenosis, aortic regurgitation

Adults after Mustard/Senning (the cohort that grew up):

Morphologic RV functions as systemic ventricle for life → fails by 4th-5th decade
Systemic RV EF < 40% in majority by adulthood
SSS requiring pacing very common
AF/atrial flutter major cause of morbidity (hemodynamic collapse)
Baffle leaks → paradoxical embolism; baffle obstruction → SVC/IVC syndrome

Prognosis: 30-year survival after Mustard/Senning ~70%; after arterial switch > 90%.

13. Total Anomalous Pulmonary Venous Return (TAPVR)

What it is: All four pulmonary veins fail to connect to the left atrium, draining instead into systemic veins or right atrium. An ASD is obligatory for survival (all systemic output depends on left-to-right then right-to-left mixing at atrial level).

Adults rarely present with unrepaired TAPVR. Adults encountered in ACHD clinics have undergone neonatal surgical repair and may present with:

Pulmonary venous stenosis (at anastomotic site) - most feared complication
Right heart dilation if residual shunt
Atrial arrhythmias

14. Truncus Arteriosus

What it is: A single arterial trunk exits the heart (instead of separate aorta and PA), overrides a VSD, and gives rise to the aorta, pulmonary arteries, and coronary arteries. The truncal valve (usually 3-4 leaflets) may be stenotic or regurgitant.

Classification (Collett & Edwards):

Type I: Short main PA from trunk, then branches
Type II: Right and left PAs arise separately but close together from posterior trunk
Type III: PAs arise from widely separated lateral origins on trunk
(Type IV - pulmonary blood from collaterals - now classified as pulmonary atresia with VSD)

Associated with DiGeorge syndrome / 22q11 deletion in ~30-35%.

Adults presenting unrepaired have Eisenmenger syndrome. Post-repair adults have:

Conduit failure (RV-to-PA conduit calcifies and must be replaced/re-replaced)
Truncal valve regurgitation
LV dysfunction

15. Hypoplastic Left Heart Syndrome (HLHS)

What it is: Severe underdevelopment of all left-sided structures - mitral stenosis/atresia, LV hypoplasia, aortic stenosis/atresia, hypoplastic ascending aorta. Incompatible with life without intervention.

Management: Three-stage surgical palliation - Norwood (neonatal), bidirectional Glenn (4-6 months), Fontan completion (2-4 years). The systemic RV (morphologic RV) supports the entire circulation.

Adults with HLHS post-Fontan have all the complications of Fontan circulation (see below), plus a systemic RV prone to early failure.

PART 5: COMPLEX / MIXED LESIONS

16. Ebstein Anomaly of the Tricuspid Valve

What it is: Apical displacement of the septal and posterior leaflets of the tricuspid valve from the true AV junction into the RV, creating an "atrialized" RV (portion of RV functions as part of right atrium). The large anterior leaflet (sail leaflet) is present but tethered.

Anatomy:

Right atrium proper + atrialized RV (above valve) + true RV (below valve)
Tricuspid regurgitation is near-universal
ASD or PFO in > 50% - allows right-to-left shunting when RV pressure rises

Clinical:

"Sail sound" - loud delayed second component of S1 (large anterior tricuspid leaflet)
Widely split S1 (tricuspid closure delayed)
Peripheral cyanosis if ASD present with right-to-left shunting
ECG: peaked P waves + wide, bizarre QRS (RBBB-like); Wolff-Parkinson-White (delta waves) in 20% (accessory pathway)
SVT/AF/flutter in 30-40%; VT uncommon but risk of sudden death
CXR: massively enlarged cardiac silhouette ("wall-to-wall heart") in severe cases

Spectrum: Wide, from trivial valve displacement (asymptomatic) to massive RV failure in infancy.

Management:

Intervention for: worsening functional class, increasing cyanosis, arrhythmia, paradoxical embolism/stroke, progressive RV dilation
Tricuspid valve repair (preferred) - Cone repair (reimplants all leaflet tissue to true annulus) has become the technique of choice
Tricuspid valve replacement if repair not feasible
ASD closure simultaneously
WPW: catheter ablation before or at surgery

17. Congenitally Corrected Transposition of the Great Arteries (ccTGA / L-TGA)

What it is: Double discordance - AV discordance (RA connects to LV via mitral valve; LA connects to RV via tricuspid valve) + ventriculoarterial discordance (LV connects to PA; RV connects to aorta). The two discordances "correct" each other hemodynamically - blue blood still goes to the lungs, red blood still goes to the body. However, the morphologic RV performs systemic work lifelong.

In isolation (rare): Patient can be entirely asymptomatic until the 5th-6th decade when the systemic RV finally fails.

Associated defects (most patients have at least one):

VSD (70%)
Pulmonary stenosis (40%)
Ebstein-like anomaly of the systemic tricuspid valve (30%)
Complete heart block (progressive, ~2% per year risk)

Clinical issues in adults:

Systemic RV failure - the most important long-term problem
Systemic AV (tricuspid) valve regurgitation - worsens RV function
Heart block - requires pacing; risk of RV pacing-induced dyssynchrony
Arrhythmias - SVT, AF/flutter
ECG: Q waves in right precordial leads (V1-V3); absent in left leads - due to reversed septal activation

Double-switch operation (atrial switch + arterial switch OR Rastelli) - can restore LV as systemic ventricle in selected patients; complex; must be done before RV is too damaged.

18. Double Outlet Right Ventricle (DORV)

What it is: Both the aorta and pulmonary artery arise entirely or predominantly (>50%) from the morphologic RV. A VSD is almost always present and provides the only outlet for the LV.

Clinical behavior depends entirely on VSD position and pulmonary blood flow:

VSD Position	Resembles	Pulmonary flow
Subaortic VSD	Large VSD	Increased
Subpulmonary VSD (Taussig-Bing anomaly)	TGA	Increased
Doubly committed VSD	Large VSD or PS	Depends on PA
Non-committed VSD	Complex	Variable

If pulmonary stenosis coexists → resembles TOF (cyanotic, decreased pulmonary flow).

Surgical repair is tailored to VSD position and aims to baffle LV to aorta. Adults present with residual lesions post-repair.

19. Single Ventricle / Univentricular Heart (Fontan Circulation)

What it is: A spectrum of lesions where only one adequately developed ventricle exists (or two ventricles cannot be separated). This includes hypoplastic left heart, tricuspid atresia, heterotaxy with unbalanced AVSD, and others.

Fontan palliation: The definitive repair channels all systemic venous blood passively to the lungs (total cavopulmonary connection - TCPC). Pulmonary blood flow is driven entirely by central venous pressure rather than a pumping ventricle.

Fontan-associated complications (major in adults):

Complication	Details
Fontan-associated liver disease (FALD)	Hepatic venous congestion → fibrosis → cirrhosis → hepatocellular carcinoma; present in virtually all adults after >20 years
Protein-losing enteropathy (PLE)	Lymphatic hypertension → protein loss into gut; 5-10% of Fontan patients; very high mortality
Plastic bronchitis	Fibrinous casts in airways from lymphatic leak
Atrial arrhythmias	Intra-atrial re-entrant tachycardia (IART) very common; hemodynamic collapse
Thromboembolic events	Fontan circuit has sluggish flow; anticoagulation often used
Progressive ventricular failure	Single ventricle does all systemic work without a subpulmonary ventricle
Fontan failure	End-stage; heart transplant (very high risk) is only cure

20. Heterotaxy Syndromes

What it is: Abnormal left-right body asymmetry affecting the heart and abdominal organs.

Type	Features
Asplenia (bilateral right-sidedness / right isomerism)	Two morphological right lungs, absent spleen, complex CHD (common AV valve, TAPVR, DORV, pulmonary atresia) - severe; most die in infancy
Polysplenia (bilateral left-sidedness / left isomerism)	Two morphological left lungs, multiple spleens, IVC interruption with azygos continuation, AVSD, heart block - less severe

21. Sinus of Valsalva Aneurysm / Anomalous Coronary Arteries

Sinus of Valsalva aneurysm:

Congenital weakness between aortic media and annulus fibrosus
Usually arises from right coronary sinus (75%) or non-coronary sinus (20%)
Can rupture into RV outflow or RA → sudden aortic-to-right heart shunt, acute heart failure
Unruptured: asymptomatic; detected incidentally
Surgical repair or catheter-based closure after rupture

Anomalous coronary artery origins:

Most common: left circumflex from right sinus of Valsalva (benign course)
High-risk: left main or RCA arising from opposite sinus and coursing between aorta and PA → compression during exercise → sudden death in young athletes
CT coronary angiography is diagnostic
Surgical reimplantation or bypass grafting for high-risk anatomy

PART 6: EISENMENGER SYNDROME

What it is: End-stage complication of any large, long-standing left-to-right shunt in which irreversible pulmonary vascular disease develops, raising PVR to suprasystemic levels and reversing the shunt (right-to-left). The underlying defect (VSD, ASD, PDA, AVSD) is now inoperable.

Mechanism: Chronic exposure of pulmonary vasculature to high flow and/or high pressure → endothelial injury → Heath-Edwards changes → medial hypertrophy, intimal proliferation, plexiform lesions → fixed elevation in PVR.

Rate of development by lesion:

Large VSD/PDA → Eisenmenger in ~10% by 1st decade (high flow + high pressure)
ASD → Eisenmenger in 5-10% by 4th-5th decade (high flow, low pressure)

Clinical features:

Central cyanosis and digital clubbing
SaO2 typically 75-85%
Erythrocytosis (compensatory polycythemia)
Hemoptysis
Narrow pulse pressure
Loud P2, palpable pulmonary artery
Tricuspid and pulmonary regurgitation murmurs
ECG: RVH, RAE, right axis deviation
CXR: dilated central PAs, "pruned" peripheral vessels, cardiomegaly

Complications:

Hyperviscosity symptoms (headache, dizziness, blurred vision, fatigue, paresthesias) when Hct > 65%
Iron deficiency (worsens stroke risk - iron-deficient RBCs less deformable)
Paradoxical embolism → stroke/brain abscess
Gallstones (hemolysis-related bilirubin)
Gout (uric acid from high cell turnover)
Coagulopathy (both bleeding and clotting tendency)
Sudden death (arrhythmia or pulmonary hemorrhage)

Management:

PAH-targeted therapy: Bosentan (endothelin receptor antagonist) - 62.5 mg BID × 4 weeks then 125 mg BID - improves exercise capacity and hemodynamics; sildenafil, tadalafil (PDE-5 inhibitors), prostanoids (iloprost, treprostinil) also used
Phlebotomy: Only for symptomatic hyperviscosity with Hct > 65%; always replace with equal volume IV fluid; iron supplementation must accompany phlebotomy
Iron deficiency: Must be corrected; low iron = worse outcome despite "normal" Hct
Pregnancy: Contraindicated (~50% maternal mortality)
Surgery/catheter closure: Contraindicated once Eisenmenger physiology established
Transplantation: Heart-lung transplant for eligible patients; results improving but limited by organ availability
Avoid: Dehydration, vasodilators (systemic vasodilation with fixed PVR → catastrophic decrease in pulmonary flow), NSAIDs (renal function), high altitude

Summary Table: All CHD Types

Defect	Category	Key Feature	Key Adult Issue
Secundum ASD	Acyanotic, shunt	Fixed split S2	AF, PAH, paradoxical embolism
Primum ASD	Acyanotic, shunt	Left axis, cleft MV	MV regurgitation post-repair
Sinus venosus ASD	Acyanotic, shunt	Associated APVR	Surgical only (no device)
PFO	Acyanotic	No fixed split	Cryptogenic stroke
VSD	Acyanotic, shunt	Pansystolic murmur	AR (outlet/perimembranous), Eisenmenger (large)
PDA	Acyanotic, shunt	Machinery murmur	Eisenmenger (differential cyanosis)
AVSD (partial)	Acyanotic, shunt	Left axis + cleft MV	Residual MR
AVSD (complete)	Acyanotic/cyanotic	Common AV valve	Eisenmenger if unrepaired
Bicuspid aortic valve	Obstructive	Ejection click	AS/AR, aortic root aneurysm
Subaortic stenosis	Obstructive	LVOT gradient	Progressive AR
Supravalvular AS	Obstructive	Williams syndrome	Coronary ostial obstruction
Pulmonary stenosis	Obstructive	ESM, ejection click	Excellent prognosis; VT rare
Coarctation	Obstructive	"3 sign", rib notching	Hypertension, aortic dissection
Tetralogy of Fallot	Cyanotic ↓Qp	Boot-shaped heart	Post-repair: PR, VT, SCD
Tricuspid atresia	Cyanotic ↓Qp	Left axis in cyanotic	Fontan circulation
Pulmonary atresia	Cyanotic ↓Qp	Depends on MAPCAs	Complex reconstruction
D-TGA	Cyanotic ↑Qp	Parallel circulations	Systemic RV failure (Mustard/Senning)
TAPVR	Cyanotic ↑Qp	Snowman CXR (Type I)	Pulmonary venous stenosis post-repair
Truncus arteriosus	Cyanotic ↑Qp	Single great artery	Conduit failure, truncal valve AR
HLHS	Cyanotic ↑Qp	Hypoplastic LV	Fontan + systemic RV failure
Ebstein anomaly	Complex/mixed	Sail sound, WPW	TR, RV failure, SVT, SCD
ccTGA (L-TGA)	Complex/mixed	Double discordance	Systemic RV failure, heart block
DORV	Complex	Depends on VSD	Residual lesions post-repair
Single ventricle	Complex	One functional ventricle	FALD, PLE, arrhythmias, Fontan failure
Eisenmenger	End-stage	Reversed shunt, cyanosis	PAH therapy; no repair possible

*Sources: Goldman-Cecil Medicine, Ch. 55 (Therrien & Marelli); Braunwald's Heart Disease, 12th ed., Ch. 82; Fuster & Hurst's The Heart, 15th ed., Ch. 82; 2025 ACC/AHA/HRS/ISACHD/SCAI Guideline [PMID 41411480]*Your credits are exhausted. Your daily credits reset tomorrow, or you can purchase a top-up for more.

differential diagnosis

Your credits are exhausted. Your daily credits reset tomorrow, or you can purchase a top-up for more.

This is a shared conversation. Sign in to Orris to start your own chat.