Tetralogy of Fallot a congenital defect

Tetralogy of Fallot Tetralogy of Fallot is a congenital heart defect. This is a condition of the heart's structure that's present at birth. Congenital heart defects alter the normal flow of blood through the heart.Tetralogy of Fallot is a rare, complicated heart defect. It occurs in mostly  5 out of every 10,000 ...