Pediatric Cardiology

Ebstein’s Anomaly: Symptoms, Causes, Diagnosis and Treatment

Posted on by Prof. Dr. İbrahim Cansaran TANIDIR

Ebstein anomaly is a rare congenital heart disease caused by a developmental abnormality of the tricuspid valve and the right ventricle on the right side of the heart during fetal development. In clinical practice, pediatric cardiology specialists manage echocardiography-based diagnostic algorithms beginning in the fetal period, rhythm management for life-threatening arrhythmias such as Wolff-Parkinson-White syndrome, and medical treatment protocols that include emergency intensive care. As the disease progresses, regular follow-up evaluations are performed to preserve ventricular function, and surgical intervention is carried out when necessary. These follow-ups determine the optimal timing for innovative repair techniques such as Cone reconstruction, directly improving patients’ quality of life.

What Is Ebstein Anomaly?

Comparing the heart to a well-organized house with four rooms is a useful way to understand this condition. The upper floor contains two atria, while the lower floor contains two ventricles that perform the primary pumping function. Heart valves, which can be thought of as doors between these rooms, ensure that blood flows in the correct direction. The tricuspid valve is located on the right side of the heart between the upper atrium and the lower ventricle. In normal development, this valve sits precisely at the junction between the two chambers. After allowing blood to pass downward, it closes tightly to prevent blood from flowing backward into the atrium.

In Ebstein anomaly, however, the valve fails to attach at its normal position. Instead, the valve leaflets become displaced downward, attaching deep within the lower chamber as if they had slipped toward the floor. This downward displacement significantly alters the internal architecture of the right side of the heart. A portion of the lower chamber remains above the displaced valve and begins functioning as though it were part of the upper atrium. This region, medically referred to as the atrialized right ventricle, tends to lose its primary function of pumping blood to the lungs. Consequently, the functional size and strength of the true right ventricle responsible for pulmonary circulation become reduced.

This structural abnormality creates a unique disturbance in blood flow within the heart. Every time the heart contracts, the abnormal region located above the valve, despite containing ventricular muscle, pushes blood backward rather than forward. Furthermore, because the anatomically altered tricuspid valve cannot close properly, a portion of the blood continuously leaks back into the right atrium. This persistent regurgitation gradually causes marked enlargement of the right atrium. Excessive enlargement of the right side of the heart may compress the left side, impairing its normal function. In addition, elevated right-sided pressure may force oxygen-poor blood through small openings between the atria that have been present since fetal life, allowing it to enter the oxygen-rich left side of the heart. The circulation of oxygen-deficient blood throughout the body may lead to cyanosis, which appears externally as bluish discoloration of the skin, lips, or fingertips.

Which Risk Factors Contribute to the Development of Ebstein Anomaly in Infants?

The cause of this condition is the result of a complex developmental process. Ebstein anomaly is an extremely rare congenital heart abnormality, and in most cases it is impossible to identify a single specific cause. It generally develops as a result of interactions between genetic predisposition and environmental factors during the earliest weeks of fetal cardiac development.

During normal embryological development, the heart valves separate from the inner wall of the heart and become freely movable structures. In Ebstein anomaly, this separation process fails to occur properly, causing the valve leaflets to remain attached to the heart wall and become displaced downward. The primary factors believed to contribute to this developmental variation include:

  • Genetic predisposition
  • Family history
  • Lithium use
  • Benzodiazepine use
  • Environmental factors

Genetic susceptibility and a family history of similar congenital heart conditions may moderately increase the risk. In addition to genetic influences, certain medications taken by the mother during pregnancy are also thought to affect this developmental process. For example, exposure during pregnancy to medications containing lithium or benzodiazepines, commonly used in psychiatric treatment, has been observed to have a possible association with these types of anatomical abnormalities in the fetus. However, it is important to understand that this condition is generally considered a natural variation arising from an extremely delicate and complex embryological developmental process that is largely beyond anyone’s control.

How Is Ebstein Anomaly Diagnosed Before Birth?

Since the severity of cardiac involvement varies considerably from one patient to another, diagnostic evaluation should ideally begin during fetal life. At this stage, fetal echocardiography, a safe imaging method that uses sound waves to examine the fetal heart in detail, is the most commonly utilized diagnostic tool.

Initial evaluations performed between the 12th and 16th weeks of pregnancy are valuable for identifying major structural abnormalities of the heart at an early stage. Fetal echocardiography is particularly recommended when increased nuchal translucency is detected during routine examinations, when there is a family history of congenital heart disease, or when other genetic screening tests reveal suspicious findings. During this period, the sizes of the cardiac chambers and the positions of the major blood vessels leaving the heart are carefully evaluated.

Later in pregnancy, particularly between the 28th and 30th weeks, repeat assessments become critical for understanding the progression of valve leakage. During these weeks, physicians can more accurately evaluate whether tricuspid regurgitation is worsening, the extent of right atrial enlargement, and the fetal heart rhythm. Certain changes in the fetal heart rate may also provide clues regarding associated structural or chromosomal abnormalities. Accurate assessment during fetal life plays a vital role in delivery planning, preparation for neonatal intensive care, and ensuring that the newborn receives the most appropriate medical support immediately after birth.

How Is the Diagnosis of Ebstein Anomaly Confirmed After Birth?

After birth, or sometimes later in life when symptoms develop, several imaging technologies are used to clarify the condition of the heart. The primary goals of the diagnostic process are to determine the degree of downward displacement of the tricuspid valve, assess the remaining functional capacity of the right ventricle, and evaluate the heart’s overall pumping performance.

The main diagnostic methods used to confirm the diagnosis and define the heart’s anatomy include:

  • Transthoracic echocardiography
  • Transesophageal echocardiography
  • Cardiac magnetic resonance imaging
  • Electrocardiography

Standard ultrasound performed through the chest wall measures the extent to which the tricuspid valve has shifted toward the apex of the heart. This displacement is measured in millimeters and adjusted according to the patient’s body surface area to confirm the diagnosis. However, to obtain a more detailed view of the valve structure, especially its posterior portions, transesophageal echocardiography may sometimes be required. This technique provides a clearer three-dimensional assessment of valve anatomy, particularly when surgical planning is being considered.

Cardiac magnetic resonance imaging (MRI), meanwhile, offers much more precise measurements of the true capacity of the right ventricle, the volume of blood it contains, and the condition of the heart muscle. In cases where ultrasound may overestimate or underestimate cardiac enlargement, MRI findings often correlate more accurately with the patient’s exercise tolerance and overall clinical condition. Electrocardiography is also an essential component of the diagnostic evaluation, allowing assessment of the heart’s electrical conduction system and rhythm.

How Is Ebstein Anomaly Classified According to the Condition of the Heart Valves?

The clinical course of this structural abnormality is not identical in every patient. The degree of downward valve displacement, the extent of valve attachment to the heart wall, and the remaining functional size of the right ventricle all determine disease severity. To classify this anatomical spectrum and facilitate more accurate treatment planning, the Carpentier classification system is widely used.

The primary categories within this anatomical classification include:

  • Type A
  • Type B
  • Type C
  • Type D

In Type A, although the valve is somewhat displaced downward, the size of the right ventricle remains largely preserved. The valve leaflets maintain relatively good mobility, and the heart’s pumping function remains adequate. Consequently, patients in this category generally experience milder symptoms. In Type B, the atrialized portion of the right ventricle is larger, while the remaining ventricle, although smaller, is still capable of functioning reasonably well.

Types C and D represent progressively more severe anatomical abnormalities. In Type C, valve mobility is significantly restricted, and the right ventricular outflow tract may become physically narrowed. The right ventricle is substantially reduced in size. Type D represents the most severe form, in which nearly the entire right ventricle becomes incorporated into the right atrium. The valve leaflets appear almost plastered against the heart wall, leaving very little functional ventricular muscle.

Additional measurements, including the Celermajer index, which compares enlarged cardiac regions with healthy areas, are also used to estimate disease severity, particularly during the early stages of clinical evaluation.

What Heart Rhythm Problems Can Occur in Patients with Ebstein Anomaly?

The anatomical abnormalities affecting the right side of the heart not only impair blood pumping but also tend to disrupt the heart’s electrical conduction system. The heart contracts and relaxes in a coordinated rhythm through a specialized electrical network. In Ebstein anomaly, marked enlargement of the right atrium stretches and lengthens these conduction pathways.

Electrocardiograms often reveal tall, peaked P waves reflecting enlargement of the right atrium. Delayed electrical conduction on the right side may also appear as bundle branch block patterns. These conduction delays and chamber enlargement increase the likelihood of developing cardiac arrhythmias.

One of the rhythm disorders frequently associated with this condition is Wolff-Parkinson-White syndrome. In a normal heart, electrical impulses travel from the atria to the ventricles through a single primary conduction pathway. However, hearts affected by Ebstein anomaly may contain congenital accessory electrical pathways. These extra pathways, often located near the tricuspid valve, create abnormal electrical circuits that may cause episodes of rapid heart rate (palpitations). Because the heart is already structurally compromised, these episodes place additional strain on the myocardium. In patients with persistent rhythm disturbances, these accessory pathways may be identified and eliminated using catheter-based procedures similar to angiography, employing thermal energy. Effective rhythm control is particularly beneficial before planned surgical intervention.

Which Medications Are Used for Ebstein Anomaly During the Newborn Period?

If the tricuspid valve is severely affected at birth, pumping blood to the lungs becomes extremely difficult. Since pulmonary vascular resistance is naturally elevated in newborns, the already weakened right ventricle faces an even greater workload. When oxygen levels fall and cyanosis develops, emergency medical treatment protocols are initiated.

The primary medical treatments used in neonatal intensive care include:

  • Prostaglandins
  • Milrinone derivatives
  • Inotropic agents
  • Diuretics
  • Anticoagulants

Maintaining patency of the ductus arteriosus, a special blood vessel that is normally open before birth but closes shortly afterward, is extremely important. This vessel provides an alternative pathway for blood to reach the lungs. Intravenous prostaglandin therapy is administered to keep this vessel open temporarily. In cases with significant heart failure, agents such as milrinone are used to dilate blood vessels and reduce the heart’s workload.

If blood pressure is critically low and organ perfusion is inadequate, carefully dosed inotropic medications may be administered to strengthen cardiac contractions. If heart failure symptoms persist during the following months, diuretics are used to eliminate excess fluid from the body. In addition, anticoagulant therapy may be included in the treatment plan to reduce the risk of blood clot formation within enlarged cardiac chambers.

When Does Surgery Become Unavoidable for Ebstein Anomaly?

A diagnosis of Ebstein anomaly does not necessarily mean that surgery is required in the near future. Many patients can live for years with regular medical follow-up and appropriate medical management without requiring an operation. The decision to perform surgery is individualized based on each patient’s anatomy, clinical condition, and disease progression.

The clinical situations in which surgical intervention becomes increasingly appropriate include:

  • Progressive fatigue
  • Reduced exercise capacity
  • Growth retardation
  • Severe cyanosis
  • Low blood oxygen levels
  • Persistent rhythm disorders
  • Recurrent stroke

Children who become fatigued much more quickly than their peers during physical activity, experience shortness of breath during daily activities, or demonstrate significant slowing of growth require careful evaluation for surgical treatment. If imaging studies reveal progressive enlargement of the right ventricle together with declining pumping function, surgical repair is considered before further deterioration occurs.

Furthermore, if pressure differences within the heart cause increasing right-to-left shunting of oxygen-poor blood, leading to dangerously low blood oxygen levels, surgical correction becomes necessary. Episodes of severe arrhythmia that cannot be controlled with medication or catheter ablation may also indicate the need for valve repair. In some patients, an increased risk of blood clots traveling through intracardiac defects to the brain or other organs may also justify preventive surgical intervention.

What Innovative Surgical Techniques Are Currently Used for Ebstein Anomaly?

Older surgical techniques allowed only limited improvement in valve leaflet mobility and often resulted in the need for repeat operations over time. Today, modern surgical approaches provide much more physiological, durable, and functional outcomes.

Among these innovative techniques, the Cone procedure has become the preferred method. In this operation, the displaced and immobile valve leaflets are carefully detached from the ventricular wall and completely mobilized through a 360-degree reconstruction. The patient’s own valve leaflets are then reconstructed into a cone-shaped configuration and reattached at the normal anatomical position of the tricuspid valve. One of the greatest advantages of this technique is that no artificial prosthetic valve is required. Because the reconstructed valve consists entirely of the patient’s own tissue, it has the potential to grow with the child. As a result, lifelong anticoagulation becomes less necessary, and the likelihood of future reoperations is reduced.

In critically ill newborns, however, the right ventricle may not be strong enough to tolerate such an extensive reconstruction. In these situations, a surgical approach known as the Starnes procedure may be performed. In this operation, the abnormal tricuspid valve is closed using a patch, temporarily excluding the right ventricle from circulation. This strategy allows the infant to survive until the pulmonary circulation matures, after which the possibility of later Cone reconstruction can be evaluated.

When the right ventricle has been repaired but still lacks sufficient capacity to pump all blood into the lungs, the Glenn procedure may be performed, directing blood returning from the upper body directly into the pulmonary arteries and thereby reducing the workload of the right ventricle. Advances in surgical technology have also made it possible to perform operations in adolescents and adults through smaller incisions between the ribs beneath the armpit, eliminating the need for full sternotomy. This approach accelerates recovery while also providing improved cosmetic results.

What Kind of Life Can Children Born with Ebstein Anomaly Expect?

The long-term outlook varies considerably depending on disease severity, the extent of cardiac involvement, and the treatments performed. Children with milder anatomical forms such as Type A generally have an excellent prognosis. With regular outpatient follow-up and occasional medical therapy, they can usually continue their daily lives, attend school, and participate in physical activities comparable to those of their peers. Their growth and development generally proceed normally. Women with mild tricuspid regurgitation may also successfully complete pregnancy and childbirth under specialized medical supervision.

In patients with moderate or severe disease, heart rhythm disturbances and progressive weakening of the heart muscle may develop over time. Nevertheless, even newborns presenting with extremely severe symptoms now have significantly improved survival into adulthood thanks to advances in neonatal intensive care and timely specialized surgical repair. Successful early intervention provides the heart with an important opportunity for recovery.

One of the most critical considerations is that Ebstein anomaly requires a specialized three-dimensional anatomical approach unlike routine heart diseases. For this reason, patients requiring surgical treatment should be managed at centers with extensive experience in congenital heart disease and regular expertise in advanced reconstructive techniques. Such specialized care plays a major role in achieving optimal long-term outcomes.

Güncellenme Tarihi: 13.10.2026

Leave a Reply

Your email address will not be published. Required fields are marked *

Call Now Button