What are the four defects of tetralogy?
Tetralogy of Fallot (TOF) | Nationwide Children's Hospital
Tetralogy of Fallot is a heart defect made up of four different heart problems: ventricular septal defect, overriding aorta, pulmonary stenosis and right ventricular hypertrophy. These problems result in cyanotic, or blue, skin on babies because of a lack of oxygen.
