Tetralogy of Fallot is the most common cyanotic congenital heart disease, accounting for about 10% of congenital heart diseases. This heart disease causes structural abnormalities of the heart.

Tetralogy of Fallot is the most common type of cyanotic congenital heart disease. Early diagnosis and treatment of tetralogy of Fallot helps many children return to normal lives.

Tetralogy of fallot is the most common cyanotic congenital heart disease, accounting for 75% of cases of cyanotic TBS in children over 1 year of age, including 4 heart defects (tetrads) namely: ventricular septal defect, pulmonary stenosis, and arterial stenosis. The owner rides a horse on the interventricular septum, right ventricular thickening.