What is Ebstein's Anomaly?
Ebstein's Anomaly is a congenital malformation of the tricuspid valve. In a normal heart, the tricuspid valve lies between the right atrium and right ventricle. In this defect, the valve leaflets — typically the posterior and septal leaflets — are displaced downward into the right ventricular cavity.
As a result, part of the right ventricle becomes functionally incorporated into the right atrium — the so-called "atrialized" ventricle. The effective right ventricle is smaller than normal, and the tricuspid valve regurgitates — blood leaks back into the right atrium. A patent foramen ovale or accessory conduction pathways frequently coexist.
"I always explain the same thing to families with this diagnosis: the word 'severe' means something different for every child. One patient lives for 30 years without ever knowing they have a defect; another needs intervention within the first week. My job is to accurately determine that difference."
Symptoms
The clinical picture depends on the severity of the defect. Children with mild forms can remain symptom-free for years. Severe forms present immediately after birth:
- Cyanosis — bluish discoloration of skin and mucous membranes
- Shortness of breath, especially during physical activity
- Arrhythmias — tachycardia, irregular heartbeat
- Easy fatigability, reduced exercise tolerance
- Cardiomegaly — enlargement of the heart
- In newborns — severe cyanosis and pulmonary hypertension
Diagnosis
Ebstein's Anomaly is detectable on prenatal ultrasound via fetal echocardiography. After birth, the primary diagnostic tool is echocardiography, which evaluates leaflet position, degree of regurgitation, right heart dimensions, and pulmonary blood flow.
ECG identifies arrhythmias. Chest X-ray assesses heart size. In severe cases, MRI provides precise evaluation of right ventricular function.
Important: Arrhythmias — especially Wolff–Parkinson–White syndrome — frequently accompany Ebstein's Anomaly. Treatment of the arrhythmia may need to precede cardiac surgery. Both issues must be evaluated together as part of a comprehensive plan.
Treatment Approach
Observation: In mild forms with no symptoms — regular cardiology follow-up. No intervention required.
Surgery: Tricuspid valve repair — reconstruction — is the preferred approach. When repair is not feasible, a prosthetic valve is implanted. Simultaneously, the patent foramen ovale is closed and accessory conduction pathways are divided.
Single-ventricle palliation: When the right ventricle is too small for a biventricular repair, the Fontan procedure — directing blood directly to the pulmonary artery — is performed.
Outcomes
Long-term results of tricuspid valve repair at specialized centers are favorable. The majority of children attend school, participate in sports, and lead full lives. Lifelong cardiac follow-up is essential.
Can Ebstein's Anomaly be detected during pregnancy?
Yes. Fetal echocardiography can detect this defect from 18–22 weeks of gestation. Prenatal diagnosis allows parents time to prepare, and delivery can be planned at a specialized center. Severe forms may require immediate intervention after birth.
When is surgery performed?
Timing depends on severity. Severe cyanosis in a newborn — immediate. Moderate forms — based on symptoms, typically during childhood. Mild forms may never require surgery.
Does arrhythmia require separate treatment?
Sometimes yes. Accessory pathways in Wolff–Parkinson–White syndrome can be divided at the time of cardiac surgery. In some cases, catheter ablation — a standalone procedure — is performed first. This decision is made together with an electrophysiologist.
Do children live normally after surgery?
The majority do. After successful reconstruction, children attend school and play sports. Lifelong cardiac monitoring is required, but quality of life is close to normal for most patients.