A congenital heart disease, combining a number of heart defects: stenosis of the right ventricle outlet, incomplete closure of the inter-ventricular septum (the partition wall separating the left and the right ventricle), dilatation of the right ventricle and displaced Aorta.
The result of these defects is blood leak from the right ventricle to the left ventricle through a hole in the septum.
The significance of such leak is mixing of non-oxygenated blood from the right ventricle with oxygen-rich blood from the left ventricle.
As a result, the body tissues are supplied with “mixed” blood, i.e. with lower oxygen level than required and this is manifested by cyanosis.
The solution of the problem is surgical correction.