b'Scientific Session Abstracts SATURDAY APRIL 20, 2024 24: THE FATE OF OCTAGENARIANS AFTER FOUR-VESSEL PHYSICIAN-MODIFIED ENDOGRAFTINGAldin Malkoc, MD; Raja Gnanadev, MD; Trung D. Vo, MD;Jason Behseresht, MD; Majid Tayyarah, MD; Jeffrey Hsu, MD;Iden Andacheh, MD1.DEPARTMENT OF GENERAL SURGERY, ARROWHEAD REGIONAL MEDICAL CENTER, COLTON, CA 2.DEPARTMENT OF VASCULAR SURGERY, KAISER PERMANENTE BERNARD J. TYSON SCHOOL OF MEDICINE, PASADENA, CABackground: With the global availability of endovascular repairs for abdominal aortic aneurysms, the overall prevalence of elective repairs for simple and complex endovascular aneurysm repairs (EVAR) has increased. With an increasing aging population attention regarding surgical fitness must be considered. As endovascular aneurysm repairs (EVAR) is increasingly performed in patients in their 80s and 90s, our study investigates outcomes in Octogenarians requiring complex abdominal and thoracoabdominal aortic aneurysms utilizing physician-modified endovascular grafts (PMEGs).Methods: Retrospective review of all patients undergoing an abdominal or thoracoabdominal four vessel fenestrated PMEG repair at a single quaternary vascular center from 2019-2023 was collected. Two groups were considered: 1. octogenarians or 2. non-octogenarians. Demographic data included length of stay (LOS), CYDAR 3D overlays for surgical guidance, contrast volume (ml), fluoroscopy time (min), procedure length (mins), mortality, blood loss (ml), pre-operative and post operative renal function, 30-day readmission, and post-op delirium. Univariate analyses were performed and a p-value less than 0.05 was considered statistically significant.Results: A total of 21 PMEG patients were analyzed: 7 in the octogenarian group and 14 in the non- octogenarian group. In the univariate analysis there was no statistical difference in the non- octogenarian and octogenarian aortic aneurysm size (6.2 0.7 vs. 6.7 ? 1.5, p=0.471). In the non-octogenarian group measured creatine function increased by 54% as compared to 4.5% in the octogenarian group. There was no statistical difference in the contrast volume in mL (105.9 ? 57.5 vs. 90.3 ? 53.5, p=0.682), fluoroscopy time in mins (98.1 63.7 vs. 66.6 ? 63.3, p=0.494), radiation exposure in mGy (2,437 ? 1,433 vs. 3,405 ? 4,218, p=0.494). While there was no statistical difference in the average length of stay (2.3 days ? 3.5 vs. 6.8 ? 8.5, p = 0.263) or intensive care unit length of stay (4.8 days ? 5.1 vs. ?8.5 ? 8.6, p = 0.369) the octogenarian group spent more time in the hospital on average. There was no statistical increase in post operative delirium (p=0.147), 30-day mortality (p=0.599), and 30-day readmission (p=0.568).42 NDANNUAL MEETING|APRIL 1921, 2024|OCEANSIDE, CA 71'