Fenestrated stent-grafts for salvage of prior endovascular abdominal aortic aneurysm repair.

OBJECTIVES

To review our experience with fenestrated endovascular aneurysm repair (F-EVAR) to treat complications after previous standard infrarenal endovascular aneurysm repair (EVAR).

METHODS

A prospectively maintained database including all consecutive patients with juxtarenal abdominal aortic aneurysm that were treated with F-EVAR after failed previous EVAR within the period March 2002 to November 2012 at the University Medical Center of Groningen, Netherlands (up to October 2009), and the Klinikum Nürnberg Süd, Germany (from November 2009) was analyzed. Evaluated outcomes included initial technical success, operative mortality and morbidity, and late procedure-related events with regard to survival, target vessel patency, endoleak, renal function, and reintervention.

RESULTS

A total of 26 patients (24 male, mean age 73.2 ± 6.5 years) were treated. All patients had proximal anatomies precluding endovascular reintervention with standard techniques. In 23 patients a fenestrated proximal cuff was used, and in three patients a bifurcated fenestrated stent graft. Technical success was achieved in 24 (92.3%) patients. One patient required on-table open conversion because of impossibility to retrieve the top cap as a result of twist of the ipsilateral limb. In the second patient the right kidney was lost due to inadvertent stenting in a smaller branch of the renal artery. Catheterization difficulties, all related to the passage through the limbs or struts of the previous stent graft, were encountered in 11 (42.3%) cases, including five (19.2%) patients with iliac access problems and six (23.1%) with challenging renal catheterization. Operative target vessel perfusion success rate was 94.6% (70/74). Operative mortality was 0%. Mean follow-up was 26.8 ± 28.5 months. No proximal type I endoleak was present on first postoperative CTA. The mean aneurysm maximal diameter decreased from 73 ± 20 mm to 66.7 ± 21 mm (p < .05). There were six late deaths, one of them aneurysm related. Estimated survival rates at 1 and 2 years were 94.1 ± 5.7% and 87.4 ± 8.4%, respectively. Patency during follow-up for the target vessels treated successfully with a fenestrated stent graft was 100% (70/70). Reintervention was required in four cases, including one acute conversion due to rupture, one for iliac limb occlusion and two for type Ib and II endoleak. Renal function deterioration was observed solely in the two cases of primary technical failure.

CONCLUSIONS

F-EVAR represents a feasible option for the repair of juxtarenal abdominal aortic aneurysm after prior EVAR failure. It is advantageous in terms of mortality and less morbid than open surgery, but is associated with increased technical challenges because of the previously placed stent graft. Outcome seems related to initial technical success.