PDF Tetralogy of Fallot (TOF)
Tetralogy of Fallot (TOF)
What is Tetralogy of Fallot?
Tetralogy of Fallot (TOF) is a complex heart defect that has the four following components:
1) Pulmonary stenosis (PS; narrowing of the valve between the right ventricle and the lungs) 2) Right ventricular hypertrophy (enlargement of the right lower chamber of the heart) 3) A large ventricular septal defect (VSD; a hole between the wall dividing the two lower chambers
of the heart) 4) An overriding aorta (enlarged aorta positioned over a VSD)
The combination of these four defects results in oxygen-poor blood being delivered to the body. Because oxygen-poor blood is being delivered to the body, these babies may have cyanosis (blue skin color, due to lack of oxygen).
Approximately 5 ? 7% of babies with congenital (present at birth) heart defects have TOF.
Tetralogy of Fallot
1 2
4 3
1. Pulmonary stenosis
2. Enlarged right ventricle
3. Ventricular septal defect
4. Overriding (shifted) aorta
Reprinted with permission from
What causes TOF?
Currently, the exact cause of TOF is not known. Heredity likely plays a role in the development of all heart defects, meaning that if someone had a congenital heart defect, he or she has an increased chance of having a child with a heart defect.
How is TOF treated?
Open heart surgery is required to correct TOF. Your child's doctor(s) will discuss appropriate treatment options with you.
For more information
American Heart Association - Cincinnati Children's Hospital Medical Center's Heart Center Encyclopedia ? MedlinePlus - National Heart Lung and Blood Institute -
Sources: Cincinnati Children's Hospital, American Heart Association
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