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Congenital Abnormality
overriding aorta
[ oh-ver-rahy-ding ey-awr-tuh ]
Definitions related to overriding aorta:
  • A congenital anatomic anomaly in which the aorta is positioned directly above a ventricular septal defect, thus receiving blood from both the right and left ventricles, resulting in an overall decrease In oxygenated haemoglobin and tissue cyanosis.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • An overriding aorta is a congenital heart defect where the aorta is positioned directly over a ventricular septal defect, instead of over the left ventricle. The result is that the aorta receives some blood from the right ventricle, which reduces the amount of oxygen in the blood. It is one of the four conditions of the Tetralogy of Fallot. The aortic root can be displaced toward the front (anteriorly) or directly above the septal defect, but it is always abnormally located to the right of the root of the pulmonary artery. The degree of override is quite variable, with 5-95% of the valve being connected to the right ventricle.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.

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