Tetralogy of Fallot is a common type of cyanotic congenital heart disease, primarily composed of four structural components: first, a ventricular septal defect; second, an overriding aorta; third, hypertrophy of the right ventricle; and fourth, obstruction of the right ventricular outflow tract. When performing an electrocardiogram (ECG) on Tetralogy of Fallot, it often shows right ventricular hypertrophy, and can also display right atrial hypertrophy. Initially, there may be hypertrophy of both the left and right ventricles. As the child develops cyanosis, it progressively evolves into hypertrophy of the right ventricle. These are the typical ECG findings in Tetralogy of Fallot.