What is the primary purpose of an EVAR stent graft?

• A. To exclude the aneurysm sac from arterial pressure and prevent rupture
• B. To redirect arterial flow to collateral vessels
• C. To compress adjacent veins
• D. To replace the femoral artery in bypass

Answer: (A)

The main idea here is that an EVAR stent graft is designed to exclude the aneurysm sac from the pressure of circulating blood so the risk of rupture is reduced. It lines the aorta with a fabric-covered stent that creates a new lumen for blood flow, sealing off the aneurysm from the high arterial pressure. By establishing proximal and distal seals, blood is redirected through the graft rather than entering the aneurysm sac, causing the sac pressure to fall and, over time, often shrink. This is the fundamental goal: prevent rupture by isolating the aneurysm from pulsatile flow.

Other options don’t fit because they describe actions not addressing the aneurysm’s pressurized sac. Redirecting flow to collateral vessels is about bypassing blockages, not preventing aneurysm rupture. Compressing adjacent veins isn’t related to aneurysm repair, and replacing the femoral artery in a bypass is a different procedure that doesn’t tackle the aneurysm sac itself.