How should a congenital internal condition be evaluated and managed?

Evaluation and Management of Congenital Internal Conditions

All patients with congenital internal conditions require risk stratification based on anatomic complexity (simple, moderate, or complex), followed by systematic evaluation for associated anomalies, genetic syndromes, and organ-specific complications, with lifelong specialized surveillance at tertiary centers for moderate-to-complex lesions.

Initial Risk Stratification and Complexity Classification

The foundation of management begins with anatomic classification, which directly determines surveillance intensity and specialist involvement 1, 2:

Simple Lesions

• Small isolated ASD, VSD, or PDA
• Mild isolated pulmonic stenosis
• Successfully repaired defects without residual shunts or chamber enlargement
• Management: Can be followed by general cardiologists with periodic specialist consultation

Moderate Complexity Lesions

• Coarctation of aorta, Ebstein anomaly, congenital valve disease
• Anomalous coronary arteries, partial/total anomalous pulmonary venous connection
• Repaired tetralogy of Fallot, moderate-large unrepaired septal defects
• Management: Requires annual evaluation at specialized ACHD centers 3

Complex Lesions

• All cyanotic congenital heart disease (repaired or unrepaired)
• Single ventricle physiology, Fontan circulation
• Transposition of great arteries, truncus arteriosus, pulmonary atresia
• Management: Mandatory lifelong care at tertiary ACHD centers with multidisciplinary teams 2

Mandatory Genetic and Syndromic Evaluation

Genetic testing is non-negotiable for specific cardiac lesions and clinical presentations 4:

Immediate FISH Testing Required

Perform 22q11.2 microdeletion testing (FISH or multiplex ligation-dependent probe amplification) before surgical intervention for all patients with:

• Interrupted aortic arch
• Truncus arteriosus
• Tetralogy of Fallot
• Conoventricular/conoseptal VSD with aortic arch anomaly
• Discontinuous pulmonary arteries

This applies regardless of facial dysmorphisms or other syndromic features 4.

Broader Genetic Consultation Indications

Refer to genetics for chromosome microarray and formal evaluation when:

• Intellectual disability, developmental delay, or hypotonia present
• Multiple congenital anomalies beyond cardiac
• Facial dysmorphia
• Failure to thrive (non-cardiac etiology)
• Microcephaly
• Normal karyotype despite clinical suspicion of syndrome 4

22q11.2 Deletion Syndrome-Specific Surveillance

If 22q11.2 deletion confirmed, implement systematic monitoring 5, 6:

• Endocrine: TSH and free T4 every 1-2 years; calcium monitoring (hypocalcemia in 60%)
• Immunology: Assess for persistent immunodeficiency and autoimmune disorders
• Audiology: Periodic ear exams and audiograms for chronic otitis media
• Ophthalmology: Screen for strabismus, refractive errors (hyperopia/astigmatism)
• Renal ultrasound: 15% have genitourinary anomalies (hydronephrosis, renal agenesis)
• Psychiatric: Increased risk of schizophrenia and mood disorders in adulthood

Organ System-Specific Evaluation Protocol

Cardiovascular Surveillance

Annual minimum for moderate-complex lesions 3:

• Resting and stress ECG (ischemia, arrhythmia detection)
• Echocardiography-Doppler: ventricular size/function, valve function, aortic root dimensions
• 24-hour ambulatory ECG monitoring for arrhythmia screening
• Exercise testing with oxygen saturation monitoring to detect functional limitation and exercise-induced cyanosis 3

Neurological Assessment

Preoperative brain imaging for complex neonatal cardiac surgery 4:

• Head ultrasound for: shock history, severe hypoxia, microcephaly, major non-cardiac anomalies
• Upgrade to CT/MRI if structural abnormalities or intracranial hemorrhage detected
• Post-seizure protocol: Immediate pediatric neurology consultation, EEG, head CT, followed by MRI (CT misses early ischemic stroke)

Developmental Screening

All high-risk patients require formal neurodevelopmental evaluation 4:

• Refer to developmental pediatrician, pediatric neurologist, or psychologist
• Automatic referral to early intervention services (birth-3 years) for children with:
  • Complex CHD (single ventricle, cyanotic lesions)
  • Genetic syndromes
  • Failed developmental screening
  • Motor abnormalities detected

Activity and Exercise Restrictions

Patients with moderate-severe aortic stenosis or aortopathy must avoid competitive athletics and strenuous isometric exercise due to sudden cardiac death risk from arrhythmias 3. Exercise testing demonstrates true functional capacity despite minimal symptoms, particularly in Ebstein anomaly with cardiomegaly 3.

Reproductive Counseling and Pregnancy Management

Preconception Planning

Mandatory prepregnancy counseling for all women with congenital heart disease 3, 6:

• Fetal cardiology referral in second trimester (increased CHD transmission risk)
• Delivery at experienced high-risk cardiac centers for all but mildest cases
• Vaginal delivery preferred unless: aortic aneurysm/dissection, critical aortic stenosis, or anticoagulation (intracranial bleeding risk to newborn)

22q11.2 Deletion-Specific Pregnancy Risks

Women with 22q11.2 deletion face elevated risks 6:

• Spontaneous fetal loss, prematurity, low birth weight
• Hypocalcemia recurrence during pregnancy (biologic stress)
• Cardiac complications if structural heart disease present
• Requires high-risk antepartum care

Surgical Intervention Timing

Ebstein Anomaly Surgical Indications 3

Immediate surgical referral for:

• NYHA class III-IV symptoms or deteriorating exercise capacity
• Severe tricuspid regurgitation with progressive RV dilation or dysfunction
• New/progressive atrial or ventricular arrhythmias
• Bioprosthetic valve dysfunction (mean gradient >12-15 mmHg)

Delivery Location and Timing

Tertiary care center delivery mandatory for prenatally diagnosed anomalies 7, 8. No indication for preterm delivery in majority of cases. Cesarean section reserved for:

• High-risk sacrococcygeal teratoma
• Congenital lung masses with fetal compromise
• Neural tube defects with head circumference >40 cm
• Gastroschisis with extracorporeal liver

Critical Pitfalls to Avoid

1. Do not refer for isolated ASD/VSD closure without excluding Ebstein anomaly - presence alters intervention recommendations 3

2. Do not perform percutaneous ablation in Ebstein with right-to-left shunt without extreme caution - paradoxical embolus risk 3

3. Do not misdiagnose pulmonary hypertension in newly diagnosed Ebstein with cyanosis and right heart enlargement - usually misinterpretation 3

4. Do not delay genetic testing in conotruncal anomalies - must occur before surgical intervention 4

5. Do not rely on chest X-ray alone for congenital pulmonary malformations - cross-sectional imaging mandatory 9

Lifelong Surveillance Requirements

All operated patients require indefinite specialized follow-up 3:

• Prosthetic valve complications (endocarditis, thrombosis, pannus ingrowth)
• Ross procedure: autograft dilatation, neo-aortic regurgitation, pulmonary homograft dysfunction
• Bentall procedure: proximal coronary obstruction risk
• Progressive native valve dysfunction (both stenosis and regurgitation are progressive)
• Ventricular arrhythmias (sudden cardiac death risk with long-standing gradients)

Echocardiographic screening of first-degree relatives recommended for bicuspid aortic valve 3.