Understanding an Overriding Aorta and Its Effects on the Heart

Written by Medicover Team and Medically Reviewed by Dr Jagadeesh Chandra Bose Y , Cardiologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

An overriding aorta is a congenital heart defect in which the aorta is positioned over a ventricular septal defect (VSD), allowing it to receive blood from both the right and left ventricles. It is commonly associated with Tetralogy of Fallot and other congenital heart abnormalities.

Because oxygen-rich and oxygen-poor blood may mix, an overriding aorta can reduce the amount of oxygen delivered to the body. The severity and symptoms depend on the associated heart defects and the degree of obstruction to blood flow.

What Are the Associated Heart Defects With an Overriding Aorta?

An overriding aorta is usually associated with other congenital heart defects rather than occurring alone. Common associated abnormalities include:

Ventricular Septal Defect (VSD): An opening between the right and left ventricles that allows blood to mix.
Pulmonary Stenosis: Narrowing of the pulmonary valve or blood flow pathway from the right ventricle to the lungs.
Right Ventricular Hypertrophy: Thickening of the right ventricular muscle caused by increased pressure or workload.

These abnormalities are characteristic features of Tetralogy of Fallot and can influence the severity of symptoms and the treatment approach.

What Are the Symptoms of an Overriding Aorta?

Symptoms vary depending on the severity of the overriding aorta and the other heart defects present. Some infants may have significant symptoms soon after birth, while others may have milder symptoms.

Cyanosis: Bluish discoloration of the skin, lips, or nails caused by low oxygen levels.
Difficulty breathing: Breathing may become rapid or difficult, particularly during feeding or activity.
Fatigue: Infants may tire easily during feeding, while older children may become tired during physical activity.
Poor weight gain: Babies may have difficulty gaining weight because of increased energy demands and feeding difficulties.
Heart murmur: An abnormal heart sound may be detected during a physical examination.

What Are the Causes of an Overriding Aorta?

An overriding aorta develops during fetal heart development when the structures of the heart and major blood vessels do not form normally. The exact cause is often unknown, but genetic and environmental factors may contribute.

Genetic factors: Certain genetic changes or chromosomal abnormalities can increase the risk of congenital heart defects.
Environmental factors during pregnancy: Certain exposures during fetal development may contribute to abnormal heart formation.
Maternal health conditions: Conditions such as diabetes during pregnancy may increase the risk of congenital heart defects.
Maternal infections: Certain infections during pregnancy, including rubella, may affect fetal heart development.
Family history: A family history of congenital heart defects may increase the likelihood of similar abnormalities.

When to See a Doctor for an Overriding Aorta?

Children with signs of a congenital heart defect should be evaluated promptly. An overriding aorta is usually diagnosed and managed by a pediatric cardiologist, while a pediatric cardiac surgeon may perform corrective surgery when required.

Adults who were born with an overriding aorta or related congenital heart defect may need ongoing care from an adult congenital cardiologist. Other specialists, such as a cardiac anesthesiologist or genetic specialist, may be involved depending on the patient's condition.

Bluish skin, lips, or nails
Difficulty breathing or rapid breathing
Fatigue during feeding or physical activity
Poor weight gain or delayed growth in infants
A heart murmur or abnormal heartbeat

Get medical help immediately if:

Severe breathing difficulty or worsening cyanosis
Fainting or extreme weakness
Rapid or irregular heartbeat with other symptoms
Severe difficulty feeding or sudden worsening in an infant's condition

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How Is an Overriding Aorta Diagnosed?

Diagnosis involves assessing the heart's structure, blood flow, oxygen levels, and associated congenital abnormalities. Early diagnosis helps doctors determine the severity of the condition and plan appropriate treatment.

What Tests Are Used to Diagnose an Overriding Aorta?

Echocardiography: An echocardiogram is usually the primary test used to examine the heart chambers, valves, VSD, aorta, and blood flow.
Cardiac MRI: Cardiac MRI can provide detailed images of the heart and major blood vessels when additional information is needed.
Cardiac catheterization: This procedure can measure pressures and blood flow inside the heart and may help with treatment planning in selected cases.
Pulse oximetry: A noninvasive test can measure blood oxygen levels.
Physical examination: The doctor may assess symptoms, heart sounds, breathing, growth, and other signs of congenital heart disease.

What Are the Treatment Options for an Overriding Aorta?

Treatment depends on the severity of the overriding aorta and the associated heart defects. Many patients, particularly those with significant Tetralogy of Fallot, require surgical repair to improve blood flow and oxygen delivery.

What Surgical Treatments Are Used?

VSD repair: The ventricular septal defect is closed to reduce the mixing of oxygenated and deoxygenated blood.
Pulmonary stenosis repair: Narrowed areas in the pathway from the right ventricle to the lungs may be widened to improve blood flow.
Complete repair: When the overriding aorta is part of Tetralogy of Fallot, surgery generally addresses the VSD and obstruction to pulmonary blood flow together.

What Is Long-Term Management After Treatment?

Children and adults who have undergone treatment require regular follow-up with a cardiologist to monitor heart function and identify complications early.

Regular cardiology follow-up
Monitoring for abnormal heart rhythms
Medications when required
Assessment of heart and valve function
Guidance on physical activity and lifestyle

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What Are the Complications of an Overriding Aorta?

Complications depend on the associated heart defects and whether the condition is treated. Without appropriate management, reduced oxygen levels and abnormal blood flow can affect the heart and other organs.

Heart failure: Increased workload on the heart can eventually weaken its pumping function.
Arrhythmias: Abnormal heart rhythms may develop because of changes in the heart's structure or after cardiac surgery.
Low oxygen levels: Blood oxygen levels may remain low when oxygen-poor and oxygen-rich blood mix significantly.
Pulmonary complications: Abnormal blood flow through the lungs can contribute to pulmonary vascular problems in some patients.
Growth and developmental problems: Infants with significant congenital heart disease may have difficulty gaining weight and developing normally without appropriate treatment.