# Association between Changes in Stent Graft Volume and Type II Endoleaks after Endovascular Aneurysm Repair

## TL;DR

This study found that changes in stent graft volume after aortic repair are linked to type II endoleaks, which can cause complications.

## Contribution

The study identifies stent graft volume changes as a novel predictor of type II endoleaks after EVAR.

## Key findings

- T2ELs were detected in 49% of patients two years after EVAR.
- SgV ratio ≤1.23 was independently associated with T2EL in multivariate analysis.
- The association between SgV ratio and T2EL was consistent across stent graft materials.

## Abstract

Type II endoleaks (T2ELs) after endovascular aneurysm repair (EVAR) are associated with delayed adverse events. This study evaluated the association between changes in stent graft volume (SgV) and T2EL after EVAR.

This study included 127 patients who underwent EVAR for abdominal aortic aneurysms between 2010 and 2022. SgVs were calculated using computed tomography, and SgV ratios were calculated by dividing SgV 2 years after EVAR by SgV immediately after EVAR. The association between the SgV ratio and T2EL 2 years after EVAR was evaluated.

T2ELs were detected in 62 patients (49%) 2 years after EVAR. Univariate analysis revealed that age, number of patent lumbar arteries, expanded polytetrafluoroethylene (ePTFE) stent grafts, and the SgV ratio were significantly correlated with T2EL. Multivariate analysis showed that age ≥80 years, patent lumbar arteries ≥4, ePTFE stent graft, and SgV ratio ≤1.23 were independently associated with T2EL. In both the ePTFE (80 patients) and polyester (47 patients) stent graft groups, the SgV ratio was independently associated with T2EL.

The SgV ratio was significantly correlated with T2EL and may improve T2EL surveillance after EVAR.