[Transluminal treatment of abdominal aortic aneurysms. Might one obstruct the renal arteries?]

During transluminal treatment of an aneurysm of the abdominal aorta, the proximal part of the stent may sometimes lay over the ostia of the renal arteries. Animal studies have shown various scarring patterns depending on the type of stent used and its duration of implantation. The Gianturco and Wallstent appear to be better tolerated than the Palmaz stents. The AA have shown that, with the Strecker stents, a neointima developed between the meshes of the stent over a surface of 43% +/- 30% in 6 weeks. May and Parodi report some occlusions in their clinical series. In the AA's series using Vanguard, no renal artery was thrombosed despite the fact that the stent lay over the artery on 2 occasions in 105 patients. In conclusion, the consequences of the proximal part of a stent laying over the ostium of a renal artery depend mainly on the type of stent used. "Wide mesh" stents are probably the best to use to prevent serious renal complications.