Early and Mid-Term Outcomes of the Inverted Limb Configuration Below Fenestrated and Branched Endografts: Experience from Two European Centers.

PURPOSE: To report a European experience on the use of the Inverted Limb (IL) below fenestrated and branched endografts (FB-EVAR) for the treatment of juxta/pararenal (JP-AAAs), thoracoabdominal (TAAAs), and para-anastomotic aortic aneurysms.

MATERIALS AND METHODS: Between 2016 and 2020, all FB-EVAR with distal IL due to previous open (OSR) or endovascular repair (EVAR) or infrarenal aortic length <76 mm at two European university centers were retrospectively analyzed. Technical success, early and mid-term iliac complications (occlusion; type Ib endoleak [EL]), IL-related complications (type III EL), and reinterventions were assessed as primary endpoints; 30-day mortality, survival and freedom from (FF) overall complications/reinterventions were assessed as secondary outcomes.

RESULTS: Forty-one high-risk patients (male 30%-73%; mean age 71±10 years; ASA 3-4, 41%-100%) underwent FB-EVAR with distal IL for 8 (19.5%) J/P-AAAs and 33 (80.5%) TAAAs. Sixteen (39%) patients with previous aortic treatment (8 OR, 8 EVAR) were included. Preoperative computed tomographic angiography showed infrarenal aortic length <76 mm in all cases. Custom-made endografts were configured as 31 (75.6%) fenestrated-only, 6 (14.6%) branched-only, and 4 (9.8%) fenestrated+branched for an overall of 158 target visceral vessels (TVVs; 3.8±0.7 TVVs/case). The IL main body was planned with 1-stent, 2-stents, and 3-stents in 6 (14.6%), 23 (56.1%), and 12 (29.3%) cases, respectively. Technical success and 30-day mortality were 97.6% (40/41) and 0%. Thirty-day complications occurred in 2 (4.9%) patients: 1 limb occlusion, requiring reintervention, 1 type III EL, spontaneously resolved. Mean follow-up was 21±16 months. Three After 30-day, 3 (7.3%) iliac complications (2 occlusions; 1 type Ib EL) were successfully managed by endovascular reinterventions; no IL-related complications were observed. The patency of TVVs was 96.8%. No correlation between anatomical characteristics, endograft configuration, and primary outcomes was observed, except for 1-stent IL and type III EL (log rank p=0.01). At 1- and 2-year follow-up survival, FF overall iliac/IL-related complications and FF reinterventions were 90% and 80%, 90% and 84%, and 92% and 87%, respectively.

CONCLUSION: The IL configuration allows a safe endovascular treatment of challenging aortic lesions in high-risk patients although needing a number of adjunctive procedures. A short main body of IL could be associated with intraoperative and perioperative type III EL.

CLINICAL IMPACT: Bifurcated endograft with inverted limb configuration increases the feasibility of a total endovascular approach in patients with challenging anatomy. The use of inverted limb overcomes the anatomical limitations of short-body initial grafts and short distance between lowest target artery and the aortic bifurcation, leading the fixation inside the endograft. Although technically demanding, this advanced technology could avoid surgical reinterventions in previous open or endovascular repair that are burdened with higher rates of morbidities and complications.