Tetralogy of Fallot is the most common cyanotic congenital heart disease in infants, accounting for about twelve percent of all congenital heart diseases. It was thoroughly described by the French physician Fallot in 1888, which is how it got its name. Tetralogy of Fallot consists of four cardiac malformations: first, obstruction of the right ventricular outflow tract; second, ventricular septal defect; third, overriding aorta; fourth, right ventricular hypertrophy.