Abstract 15296: Systemic Lupus Erythematosus Patients Admitted for Atrial Fibrillation Do Not Have Worse Outcomes: Analysis of the National Inpatient Sample

Abstract

Introduction: Systemic Lupus Erythematosus (SLE) is known to increase the risk of atrial fibrillation (AF), however it is unclear if SLE worsens outcomes in patients admitted for AF. This study aims to compare the outcomes of patients primarily admitted for AF with and without a secondary diagnosis of SLE. Methods: Data were abstracted from the National Inpatient Sample (NIS) 2016 and 2017 Database. NIS is the largest inpatient hospitalization database in the United States. The NIS was searched for hospitalizations with AF as principal diagnosis with and without SLE as secondary diagnosis using ICD-10 codes. Hospitalizations for adult patients from the above groups were identified. The primary outcome was inpatient mortality. Hospital length of stay (LOS), total hospital charges, odds of undergoing ablation, pharmacologic, and electrical cardioversion were secondary outcomes of interest. Multivariate logistic and linear regression analysis was used accordingly to adjust for confounders. STATA software was used to analyze the data. Results: There were over 71 million discharges included in the combined 2016 and 2017 NIS database. 821,630 hospitalizations were for adult patients, who had a principal ICD-10 code for AF. 2,645 (0.3%) of these hospitalizations have co-existing SLE. SLE group were younger (67 vs 71 years, P < 0.0001) and had more females (85% vs 51%, P < 0.0001). Hospitalizations for AF with SLE had similar inpatient mortality (1.5% vs 0.91%, AOR: 1.0, 95% CI 0.47-2.14, P=0.991), LOS ( 4.2 vs 3.4 days, P=0.525), total hospital charges ( $51,351vs $39,121, P=0.056), odds of undergoing pharmacologic cardioversion ( 0.38% vs 0.38%, AOR: 0.90, 95% CI 0.22-3.69, P=0.880) and electrical cardioversion (12.9% vs 17.5%, AOR 0.87, 95% CI 0.66-1.15, P=0.324) compared to those without SLE. Hospitalizations for AF with SLE had increased odds of undergoing ablation (6.8% vs 4.2%, AOR: 1.9, 95% CI 1.3-2.7, P<0.0001) compared to those without SLE. Conclusions: Patients admitted primarily for AF with co-existing SLE had similar inpatient mortality, LOS, total hospital charges, likelihood of undergoing pharmacologic and electrical cardioversion compared to those without SLE. However, SLE group had more odds of undergoing ablation.