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Open aortic surgery
Open aortic surgery ("OAS", also known as Open aortic repair, "OAR") describes a technique whereby an abdominal or retroperitoneal surgical incision is used to visualize and control the aorta for purposes of repair. OAS is used to treat aneurysms of the abdominal and thoracic aorta, aortic dissection, acute aortic syndrome, and aortic ruptures. In 2003, OAS was surpassed by endovascular aneurysm repair (EVAR) as the most common technique for repairing abdominal aortic aneurysms in the United States. In OAS for abdominal aortic aneurysm, the aneurysmal portion of the aorta is replaced with a graft, usually made of dacron or PTFE.
Open aortic surgery is distinct from aortic valve repair and aortic valve replacement, as OAS describes surgery of the aorta, rather than of the heart valves. Pathology of the aortic valve, aortic root and ascending aorta are treated with the Bentall procedure.
==Uses==
OAS is used to treat patients with aortic aneurysms greater than 5.5 cm in diameter, to treat aortic rupture of an aneurysm any size, to treat aortic dissections, and to treat acute aortic syndrome. It is used to treat infrarenal aneurysms as well as juxta- and pararenal aneurysm and thoracoabdominal aneurysms, as well as non-aneurysmal aortic pathology. Disease of the aorta proximal to the left subclavian artery in the chest is the provence of cardiac surgery and is treated via procedures such as the valve-sparing aortic root replacement.
Prior to the advent of EVAR, OAS was the only surgical treatment available for aortic 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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