Tetralogy of Fallot (TOF) repair surgery | Dr Samson Olori

What is Tetralogy of Fallot?

Tetralogy of Fallot (TOF) is a congenital heart defect with four features: (1) a large ventricular septal defect (VSD), (2) narrowing of the outflow from the right ventricle to the lungs (pulmonary stenosis), (3) the aorta “overriding” the VSD (sitting over the hole), and (4) thickening of the right ventricle. As a result, oxygen-poor blood can mix with oxygen-rich blood and be pumped to the body, causing low oxygen levels (cyanosis—bluish skin and lips), shortness of breath, fatigue, poor growth, fainting, and clubbing of fingers and toes. Without repair, TOF can lead to heart failure, arrhythmias, stroke, pulmonary hypertension, and other serious complications. The cause is not fully known; genetic and environmental factors (e.g. maternal diabetes, certain medications or infections during pregnancy) may play a role.

Diagnosis and treatment

TOF is usually diagnosed in infancy by examination (cyanosis, heart murmur), echocardiography, ECG, and chest X-ray. Surgical repair is the main treatment and is typically done in the first year of life (often in the first few months). The surgeon closes the VSD and widens the narrow pathway to the lungs. In some babies, a temporary shunt operation is done first to improve blood flow to the lungs before full repair. After repair, most children do well but need lifelong cardiology follow-up; some need further procedures or medication later. We can refer you to a paediatric cardiac centre for diagnosis, surgery, and long-term care.

Recovery and long-term care

After TOF repair, children usually stay in hospital for several days to a couple of weeks. Pain relief, monitoring of heart rhythm and function, and gradual feeding and activity are part of recovery. At home, you will be advised on wound care, activity limits, and when to seek help (e.g. fever, poor feeding, breathlessness). Lifelong follow-up with a cardiologist is important to check the heart, valves, and rhythm; some children need further surgery on the pulmonary valve or treatment for arrhythmias in later life. Good dental care and antibiotics before certain dental procedures may be recommended to reduce the risk of heart infection. We can refer you to a paediatric cardiac centre for diagnosis, surgery, and long-term care.

Frequently asked questions

Can TOF be cured?
Surgery does not make the heart completely normal but corrects the main defects so that most children can grow and lead active lives. Lifelong follow-up with a cardiologist is important.
What happens after TOF repair?
Many children do well. Some need further procedures (e.g. on the pulmonary valve) or treatment for arrhythmias. Your cardiac team will advise on activity, antibiotics for dental work, and follow-up.
At what age is TOF repair done?
Repair is usually planned in infancy or early childhood, depending on the baby’s condition and the centre’s practice. Early repair helps prevent long-term complications.
Can TOF be prevented?
TOF is congenital; it cannot always be prevented. Good prenatal care, managing diabetes and other health conditions in pregnancy, and avoiding certain medications and alcohol may help reduce the risk of congenital heart defects in general.