The aim of this study states that Elective endovascular aneurysm repair (EVAR) can be performed safely and effectively with short length of stay (LOS) and rapid recovery of the patient. Our academic hospital has identified LOS as an institutional priority; therefore, we sought to evaluate local factors that contribute to this problem to improve resource utilization. A retrospective review was conducted of a single tertiary academic medical center using a prospectively maintained institutional database of vascular surgical procedures from January 2012 to October 2019. All elective EVAR procedures were included. Excluded were symptomatic and ruptured abdominal aortic aneurysms and abdominal aortic aneurysms treated with open surgery. The primary outcome measure was LOS (days). Secondary outcomes examined were preoperative and procedure-related factors contributing to LOS. Factors were compared between two groups: those with LOS ≤2 days and those with LOS >2 days. Factors contributing to LOS were identified using two nonparametric machine learning methods: Bayesian additive regression trees (BARTs) and random survival forests. There were 216 elective EVAR procedures performed during 7 years included. Mean LOS was 3.35 days. 

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