Reduction in aortic aneurysm size: early results after endovascular graft placement. EVT Investigators

Previous reports demonstrate initial technical success with transluminally placed endovascular grafts (TPEG) for the treatment of abdominal aortic aneurysms. However, long-term changes in the size of the aorta and aneurysmal segments are unknown. The purpose of this study was to determine aortic dimensions at several levels by computed tomographic (CT) scans 1 year after TPEG.

Thirty-four patients underwent TPEG with 1-year CT scans. Patients were divided into three groups: group I, no perigraft leak; group II, early perigraft leak that sealed during the first year; and group III, persistent perigraft leak. Aortic minor and major diameters, perimeter, and area were measured at four locations: the celiac aorta, proximal neck, maximal aneurysm size, and distal neck.

There were 32 men and two women, with a mean age of 73 +/- 8 years. In group I there were 20 patients (58%), and groups II and III had seven patients (21%) each. The overall mean aneurysm minor diameter decreased from 4.79 +/- 0.68 cm at implantation to 4.39 +/- 0.86 cm at 1 year (p < 0.0001). The aneurysm sac decreased by 0.63 +/- 0.58 cm in group I, and by 0.34 +/- 0.24 cm in group II. In group III, however, the aneurysm sac increased by 0.19 +/- 0.21 cm. Aneurysm size change did not correlate with inferior mesenteric or lumbar artery patency. The dimensions of the celiac aorta and proximal neck did not change significantly. However, diameter of the distal neck enlarged by 0.12 +/- 0.27 cm (p < 0.01).

TPEG exclusion is associated with reduction of aneurysm size 1 year after implantation. Expansion of the aneurysms occurred with persistent perigraft leak. The aortic size at the celiac artery and proximal neck did not change. Dilation of the distal neck was minor but requires further long-term follow-up to determine clinical significance.