Final answer:
The inferior mesenteric artery (IMA) is often sacrificed during AAA repair, leading to a risk of colonic ischemia due to reduced blood flow to the colon.
Step-by-step explanation:
Because the inferior mesenteric artery (IMA) is often sacrificed during abdominal aortic aneurysm (AAA) repair, colonic ischemia can occur. The IMA supplies blood to the left colon, and during AAA repair, the artery may be intentionally ligated if it arises from the aneurysm or if it is in the way of placing a graft. This can lead to insufficient blood flow to the colon, resulting in ischemia. To prevent this complication, surgeons may reimplant the IMA or use other methods to maintain blood flow to the colon during the procedure.