Ring-stents supported infrarenal aortic endograft fits well in abdominal aortic aneurysms with tortuous anatomy

Abdominal aortic aneurysms (AAA) with severe angulation of the neck or of the iliac arteries are often unsuitable for endovascular repair with conventional endografts. We evaluated the performance of a ring-stent abdominal endograft (AnacondaTM Vascutek, Terumo, Scotland) in a consecutive series of infrarenal AAA.Preoperative, procedural and follow-up data of patients treated with AnacondaTM endograft between September 2005 and September 2009 were prospectively enrolled. Patients were divided in Group A (proximal neck angle > or =60 degrees or iliac arteries angle > or =90 degrees ) and Group B (all others). Main endpoints were technical and clinical success (primary and assisted) and late outcome in the two groups. Results were compared by Kaplan-Meier life table analysis with log-rank test (Mantel-Cox).One hundred twenty-seven patients, with a mean age of 73.5+/-6.9 years, have been included in this series. Mean aneurysm size was 56.7+/-10.4 mm. A severe angulation of the proximal aortic neck or/and of the iliac arteries was present in 44 cases (Group A), absent in 83 cases (Group B). The mean follow-up was 18.2+/-16.3 months. Overall primary technical success was achieved in 100\% of the patients. At twenty-four months survival, primary and assisted clinical success were 94.2\%, 88.2\% and 91.3\% in Group A and 80.3\%, 83.7\% and 95.2\% in Group B respectively. No significant differences were found between the two groups. The only factor significantly associated with decreased survival was preoperative renal insufficiency. Iliac limb patency 24 months after EVAR in severely and non-severely angulated iliac axis was 96.7\% and 98.1\% respectively, with no significant difference between the groups. Only one proximal type I endoleak was detected in a patient with severe angulation of proximal aortic neck. No significant correlation between proximal type I endoleak and severe neck angulation was found.Aneurysms with severe neck or iliac arteries angulation can be treated by a ring-stent endograft with results similar to those of AAA with more favourable anatomy.