Patient EducationAug | 14 | 2019
Tetralogy of Fallot (TOF) is a congenital heart defect (heart defect present at birth) made up of multiple heart defects that cause the blood to be inadequately oxygenated. This means organs and tissues do not receive as much oxygen as they need.
In most cases, there is no clear cause of TOF. Sometimes, it can found in people with certain genetic conditions.
TOF typically has four defects:
Many babies with Tetralogy of Fallot (TOF) will not have symptoms. In more severe cases, babies will have low oxygen levels in their blood and have a blue color to their skin.
Common symptoms of TOF include: