OAS is used to treat patients with<unk>  aneurysms greater than 5.5 cm in diameter, to treat<unk>  rupture of an aneurysm any size, to treat<unk>  dissections, and to treat acute<unk>  syndrome. It is used to treat infrarenal aneurysms, as well as juxta- and pararenal aneurysm, thoracic and thoracoabdominal aneurysms, and also non-aneurysmal<unk>  pathology. Disease of the aorta proximal to the left subclavian artery in the chest lies within the specialty of cardiac surgery, and is treated via procedures such as the valve-sparing<unk>  root replacement. Prior to the advent of EVAR, OAS was the only surgical treatment available for<unk>  aneurysms. It is still preferred at some institutions and by some patients as it may be more durable than EVAR and does not require post-operative surveillance CT scans. OAS is sometimes required for patients who have previously undergone EVAR but need further treatment, such as for degeneration of the EVAR seal zones leading to continued aneurysm growth. OAS is also sometimes required in cases of EVAR graft infection where the stent graft is removed to treat the infection.
Open aortic surgery
Emergency bleeding control
Minimally invasive cardiac surgery
Aortic cross-clamp
Intravascular imaging
Aortography
Warren operation
Mechanical filter 