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BackgroundAbdominal aortic aneurysm (AAA) is a localized bulge of the abdominal aorta, which mainly manifests as a pulsatile mass in the abdomen. Once an abdominal aortic aneurysm ruptures, the patient's life is seriously endangered. Surgery is the preferred treatment for abdominal aortic aneurysm.
FFR is obtained by dividing the pressure distal to the stenosis by the central aortic pressure, which is usually equal to the pressure proximal to the stenosis if there is no additional stenosis in between. If the FFR normalizes after stenting, the restenosis rates at six months is less than 5%. Normal FFR is 1.0 and an FFR below 0.75
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