Transposition of the Great Arteries (TGA)

In Transposition of the Great Arteries (TGA), the aorta and pulmonary artery are transposed, or switched. This means the aorta leaves the right ventricle (instead of the left side of the heart, as in a normal heart) and the pulmonary artery leaves the left ventricle (instead of the right ventricle). With this arrangement, blood is returned to the body without receiving oxygen from the lungs, and oxygen-rich blood continues to circle from the left side of the heart back to the lungs. This results in the lack of adequate oxygen to the vital organs of the body, including the heart muscle. Blood is moving in two separate circuits without adequate communication, unless a large atrial septal defect (ASD) or ventricular septal defects (VSD) is present.

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