<unk>  (OAS), also known as<unk><unk>  repair (OAR), describes a technique whereby an abdominal, thoracic or retroperitoneal surgical incision is used to visualize and control the aorta for purposes of treatment, usually by the replacement of the affected segment with a prosthetic graft. OAS is used to treat aneurysms of the abdominal and thoracic aorta,<unk>  dissection, acute<unk>  syndrome, and<unk>  ruptures. Aortobifemoral bypass is also used to treat atherosclerotic disease of the abdominal aorta below the level of the renal arteries. In 2003, OAS was surpassed by endovascular aneurysm repair (EVAR) as the most common technique for repairing abdominal<unk>  aneurysms in the United States. OAS is distinct from<unk>  valve repair and<unk>  valve replacement, as OAS describes surgery of the aorta, rather than of the heart valves. When the<unk>  valve is diseased in addition to the ascending aorta, the Bentall procedure is used to treat the entire<unk>  root. An axillary-bifemoral bypass is another type of vascular bypass used to treat<unk>  pathology, however it is not true<unk>  as it reconstructs the flow of blood to the legs from the arm, rather than in the native location of the aorta.
Open aortic surgery
Emergency bleeding control
Minimally invasive cardiac surgery
Aortic cross-clamp
Intravascular imaging
Aortography
Warren operation
Mechanical filter 