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IVT
Aortic Override
A condition where the aortic root is positioned over both ventricles rather than arising solely from the left ventricle.
Full Definition
Aortic override occurs when the aortic valve and ascending aorta are positioned such that the aortic root overrides the ventricular septum, receiving blood from both left and right ventricles. This anatomical variant is commonly seen in tetralogy of Fallot and double outlet right ventricle. The degree of override is typically expressed as a percentage, with greater than 50% override often reclassifying the lesion as double outlet right ventricle rather than ventricular septal defect with override.
Usage
Usage note: When editing reports, ensure percentages of override are clearly specified as they affect surgical classification.
In Context
- "The echocardiogram revealed significant aortic override with approximately 60% of the aortic root arising from the right ventricle." — echocardiography report
- "Surgical planning must account for the degree of aortic override when considering intracardiac repair options." — pre-operative assessment
Also known as
overriding aorta
aortic root override
Contrasted with
normally positioned aorta
committed aorta
Don't confuse with
aortic displacement
dextroposition of aorta