Abstract WP182: Effect of Prior Anticoagulation With Non-Vitamin K Oral Anticoagulants in Patients With Atrial Fibrillation on Functional and Procedural Outcomes in Patients Undergoing Thrombectomy

Abstract

Background: Atrial fibrillation (AF) has been shown to be associated with better procedural outcomes in patients with anterior circulation large vessel occlusion (aLVO) undergoing endovascular therapy (EVT). However, data surrounding the impact of pre-treatment with NOACs on procedural outcomes among patients with AF undergoing EVT for aLVO remains limited. Methods: We conducted a retrospective analysis of a prospectively maintained institutional database of EVT cases on all patients with a diagnosis of AF between Jan 2021 and Mar 2023, grouped by anticoagulation (AC) status (AC vs no AC). In the anticoagulated group, only patients on NOACs were included. Outcomes compared between groups were 90-day mRS, successful reperfusion (Thrombolysis In Cerebral Infarction (TICI) 2b-3), first-pass effect (FPE), time from skin puncture to recanalization, symptomatic intracerebral hemorrhage (sICH), and 90-day mortality. Results: Of 197 AF patients included, 97 (49.2%) had a history of being on NOAC at the time of stroke. Forty-four percent of the no AC group received intravenous thrombolysis (IVT). In the NOAC group, 59.5% of patients achieved 90-day mRS of 0-2 vs 49.3% in the no AC group (aOR=1.32, p=0.57). The rate of successful reperfusion in the NOAC group was 98.7% vs 93% in no AC group, (aOR 0.48, p=0.24). No difference was observed with regards to FPE and skin puncture to recanalization time. There was a non-significant trend of higher mortality in the no AC group (23.9% versus 12.2% in NOAC group), despite similar sICH rates (5.0% in no AC and 6.2% in NOAC group, aOR 1.08, p=0.91). Subgroup analysis of patients with a single, non-tandem occlusion of ICA or M1 analyzed by NOAC status yielded similar findings. All outcomes were adjusted for age, gender, baseline NIHSS, and IVT status. Conclusion: Among patients with AF undergoing EVT for LVO, our study did not find an association of prior anticoagulation with NOACs on procedural outcomes, although there was a trend towards better functional outcomes and numerically higher successful reperfusion rate among patients pretreated with NOACs. Further research is needed to study the impact of NOACs on procedural outcomes among patients undergoing EVT.