Tetralogy of Fallot (TOF)

Tetralogy of Fallot is one of the most common congenital heart defects. It has four main features: Ventricular Septal Defect (VSD), overriding aorta, pulmonary stenosis and right ventricular hypertrophy. VSD is a large hole between the left and right ventricles, allowing abnormal flow of oxygen poor blood into the left ventricle. The right ventricle outflow is obstructed which can limit blood flow to the lungs. The aortic valve is enlarged and overrides the VSD, which makes it easier for oxygen poor blood to enter the systemic circulation. The right ventricle wall thickens due to outflow obstruction. The combination of abnormalities can result in decreased oxygen in the systemic circulation, sometimes resulting in patients appearing blue in color. 

Watch the following video animation to learn more about this condition and treatment options.

For additional information, or to make an appointment, please contact the center for Advanced Fetal Care at 410-328-3865.