Up to 10-year follow-up after EVAR with the Endurant stent graft system: a single-center experience.

Background: Endovascular aneurysm repair (EVAR) has become the preferred treatment for infrarenal abdominal aortic aneurysms (AAA) over open surgical repair. The Endurant stent graft is widely used, and large registries report low rates of aneurysm-related mortality and reinterventions at midterm follow-up. Reports of long-term follow-up are limited. The aim of this study is to report our experiences and share our results, reintervention rate and mortality at long-term follow-up after using the Endurant stent graft.

Methods: All consecutive patients treated between 2009 and 2013 with the Medtronic Endurant I and II stent graft for an infrarenal AAA in an elective setting were included. Primary outcomes were overall and aneurysm-related survival and reintervention rates.

Results: One hundred sixty-five consecutive patients (median age 74; IQR: 68-79) with an aneurysm diameter of 62 mm (IQR: 58-70) and neck length of 29 mm (IQR: 21-40) were electively treated with the Endurant I or II stent graft. One hundred thirty-four patients (81.2%) were treated inside IFU (instructions for use) and 31 (18.8%) outside IFU. At median follow-up of 76 months (IQR: 50-97), 60 patients (36.4%) were deceased. Kaplan-Meier estimates at 10 years follow-up of overall survival and freedom from aneurysm-related mortality were respectively 48.5% (CI: 43.7-53.3%) and 97.3% (CI: 95.7-98.9%). Freedom from reintervention was 86.0% with an CI: 83.1-88.9% at 5 years follow-up and 75.6% with a CI: 70.2-81.0% at 10 years follow-up. A total of 25 (15.2%) patients had an EVAR-related reintervention; indications were endoleak (EL) type 1A (N.=11), EL type 1B (N.=3), EL type 2 (N.=6), EL type 3 (N.=1) and limb occlusion (N.=4). We found no significant differences in outcome between the inside and outside IFU groups. At 5 years follow-up 92.6% of patients had stable or decreased diameter, and 7.4% had an increased diameter.

Conclusions: This large cohort single-center study demonstrates the effectiveness and safety of the Endurant stent graft system at long-term follow-up with low reintervention rates and aneurysm-related mortality.