<unk>  (d-Transposition of the<unk><unk> ,<unk> -TGA, or<unk> , is a potentially life-threatening birth defect in the large<unk>  of the heart. The primary<unk>  (the aorta and the pulmonary artery) are transposed. It is called a cyanotic congenital heart defect (CHD) because the newborn infant turns blue from lack of oxygen. In segmental analysis, this condition is described as ventriculoarterial discordance with atrioventricular concordance, or just ventriculoarterial discordance.<unk>  is often referred to simply as transposition of the<unk><unk>  (TGA); however, TGA is a more general term which may also refer to levo-transposition of the<unk><unk>  (l-TGA).Another term commonly used to refer to both<unk>  and l-TGA is transposition of the<unk>  vessels (TGV), although this term might have an even broader meaning than TGA. Prenatally, a baby with<unk>  experiences no symptoms as the lungs will not be used until after birth, and oxygen is provided by the mother via the placenta and umbilical cord; in order for the red blood to bypass the lungs in utero, the fetal heart has two shunts that begin to close when the newborn starts<unk> hing; these are the foramen ovale and the ductus<unk> us. The foramen ovale is a hole in the atrial septum which allows blood from the right atrium to flow into the left atrium; after birth, the left atrium will be filled with blood returning from the lungs and the foramen ovale will close. The ductus<unk> us is a small, artery-like structure which allows blood to flow from the trunk of the pulmonary artery into the aorta; after birth, the blood in the pulmonary artery will flow into the lungs and the ductus<unk> us will close. Sometimes these shunts will fail to close after birth; these defects are called patent foramen ovale and patent ductus<unk> us, and either may occur independently, or in combination with one another, or with<unk>  or other heart and/or general defects.
Dextro-Transposition of the great arteries
Double aortic arch
Levo-Transposition of the great arteries
Transposition of the great vessels
Double outlet right ventricle
Tetralogy of Fallot
Trilogy of Fallot
Interrupted aortic arch