LAUSR

implantation of an aortic fenestrated (FEVAR) or branched (BEVAR) stentgraft to treat aortic aneurysms. Materials and Methods: Eighty-two patients were operated for aortic aneurism by FEVAR or BEVAR between January 2008 and December 2014 in two French university hospitals. The data were collected prospectively. The principal criterion of judgment was a postoperative degradation of the renal function at D15. It was defined using the Risk Injury Failure Loss and End Stage criteria by a reduction of more than 25% of the preoperative glomerular filtration rate (GFR) and a threshold value of GFR<60mL/min/1.73m. Univariate then multivariate analysis were carried out in order to determine the variables associated with an early degradation with the postoperative renal function. Results: Seventy-seven patients were included with a total of 145 target renal arteries. Preoperatively, 16 (20.8%) patients had a GFR<60mL/min/1.73m. At D15, 8 (10.4%) patients presented a degradation of the renal function and 21 (27.3%) patients had a GFR<60mL/min/1,73m. Only one patient needed immediate postoperative hemodialysis during 10 days. The average follow-up was 14.2 (0.1-76.4) months. Mortality was 1.3% (n1⁄41) at D30. At the end of the follow-up it was 22.4% (n1⁄417). The variables ‘‘perirenal hematoma’’ and ‘‘preoperative kidney size <100mm’’ were significantly associated with the occurrence of a degradation of the renal function at D15 after mutual adjustment in multivariate analysis (p<0.001 and p1⁄40.01, respectively). There was no significant link between the preoperative impaired renal function, any stage confused, and the occurrence of an early degradation of the postoperative renal function (p1⁄40.096). Conclusion: The presence of a preoperative reduced renal size and the occurrence of a postoperative perirenal hematoma are predictive factors of degradation of the postoperative renal function at D15 after FEVAR or BEVAR.