Three-year outcomes of a US pivotal trial substudy for conformable endoprosthesis in ≥10 mm nonangulated neck anatomy

OBJECTIVE: To report the midterm clinical outcomes from the GORE® EXCLUDER® Conformable AAA Endoprosthesis system (EXCC) pivotal regulatory trial in the United States (U.S.). METHODS: This is a prospective, multicenter, investigational device exemption clinical trial at 31 U S. sites with Core Laboratory assessment of imaging and independent adjudication of safety. The study enrolled patients with abdominal aortic aneurysms (AAA) with a minimum proximal landing zone ≥10 mm and proximal neck angulation of ≤60 degrees between December 2017 and February 2019 as part of a larger study to gain indications of the EXCC device. Endpoints included patient survival, freedom from secondary interventions, and stent-graft related outcomes. RESULTS: There were 80 patients enrolled (88.8% male, mean 73.5 ± 8.14 years-old). Mean maximum aortic diameter was 57.7±8.0 mm (range, 42.5-82.7). There was 100% freedom from type I and III endoleak and aneurysm-related mortality at 36-months. Freedom from secondary intervention was 91.9 ± (0.83, 0.96, 95% C.I.) at 36-months. There were no device fractures, migrations (≥10 mm), or aneurysm ruptures. At 36 months, thirteen patients (26.5%) had type 2 endoleak, 32 patients (58.2%) had AAA sac regression, 17 (30.9%) had no change in diameter, and 6 (10.9%) had sac enlargement. Seven patients (8.8%) through 36 months underwent reintervention. CONCLUSIONS: The 3-year outcomes have continued to show an adequate safety and efficacy profile of the EXCC device with no aneurysm related mortality or Type I/III endoleak. These results demonstrate durability for an EVAR device in US regulatory trials.