Abstract 17775: Utilization Patterns and Outcomes Associated With Open vs. Endovascular Abdominal Aortic Aneurysm Repair: Findings From the National Inpatient Sample

Introduction: Abdominal aortic aneurysm (AAA) is associated with significant morbidity and mortality. Treatment options include open and endovascular AAA repair. We explored the utilization patterns and outcomes of open and endovascular AAA repair among hospitalized patients in the US.

Hypothesis: We hypothesized that there would be no difference in the utilization patterns of open and endovascular AAA repair by race and gender.

Methods: Using the ICD-10 diagnosis and procedure codes, we queried the National Inpatient Sample 2016 to 2019 for hospitalizations among patients ≥18 years old who had an open or endovascular AAA repair. Multivariable logistic regression was used to estimate the odds of death and discharge dispositions comparing open to endovascular AAA repair. Regression models were adjusted for age, sex, median income zip, history of aneurysm of carotid, iliac, and lower extremity artery, co-morbidities including diabetes, hypertension, smoking, obesity, chronic kidney disease, congestive heart failure, myocardial infarction, COPD, and atherosclerosis.

Results: Our study included 132,775 and 36,010 weighted hospitalizations for endovascular and open AAA repair, respectively. The open AAA repair cohort were younger compared to those of endovascular AAA repair (mean age ± S.D: 65.0 ± 10.4 Vs.73.3 ± 9.0). A higher proportion of female underwent open AAA repair than endovascular AAA repair (33.5% vs. 20.9%). Across all racial/ethnic groups, endovascular repair for AAA was more common than open AAA repair among males, except for black males. A higher proportion of black males underwent open AAA repair than endovascular repair (5.7% vs. 3.9%). Patients who had open AAA repair had higher odds of death compared to those who had endovascular repair (Adjusted odds ratio [aOR], 5.99 [95% CI, 5.22-6.87]; p<.0001 ). Conversely, a higher odd of discharge to home/short term facility was noted among patients who had endovascular compared to open AAA repair (aOR, 5.83 [95% CI, 5.38 - 6.32]; p<.0001) .

Conclusions: Disparities exist in the utilization of open versus endovascular AAA repair among hospitalized patients. Results could be used to support future research to examine factors driving these disparities.