While the cause of TGA (5%) is unknown, an increased risk is associated with maternal diabetes mellitus. In a TGA, the aorta arises completely out of the right ventricle and the pulmonary arteries from the left one. From an embryologic point of view, the rotation of the aorto-pulmonary septum of 180o did not take place. The hemodynamic of the TGA is characterized by the parallel connection of the two circulatory systems that permit no oxygen intake or release. Such a circulation situation can only be survived when in addition to the TGA a mixing of O2 enriched pulmonary venous blood with the systemic venous blood via a crossed shunt can take place. Such shunt connections at the atrium level are an open foramen ovale or an atrium septum defect, at the ventricle level a VSD, and at the vessel level an open ductus arteriosus.
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Overview, according to the clinical picture, of the diagnostic possibilities as well as the therapy.
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