Abstract Number ‐ 38: Outcome Predictors in Posterior Circulation Stroke After Mechanical Thrombectomy: Pooled Analysis from NASA and TRACK

Introduction Recent randomized clinical trials have demonstrated that endovascular therapy for basilar artery occlusion is safe and effective. However, many people still have poor outcomes despite treatment. The aim of this study was to identify the predictors of good functional outcome in posterior circulation strokes after mechanical thrombectomy from the Trevo Stent‐Retriever Acute Stroke TRACK and the North American Solitaire Stent Retriever Acute Stroke (NASA) registries. Methods Patient‐level data from the TRACK and NASA registries were pooled and patients with posterior circulation stroke were included in the analysis. Patients were dichotomized into those with 90‐day good functional outcome (mRS≤2) and poor functional outcome (mRS>2). Baseline and procedural data were compared between the two cohorts. Multivariate logistic regression was then performed to identify predictors of functional outcome. P‐value < 0.05 was considered significant. Results Out of 119 posterior stroke patients (99 BA, 16 VA, and 4 PCA), a total of 110 patients had mRS data available on follow‐up. Good functional outcome was observed in 44 patients (37%). Patients with mRS≤2 were less likely to have hypertension (61.4% versus 83.3%, p = 0.01), dyslipidemia (38.6% versus 62.1%, p = 0.016), and diabetes (18.2% versus 36.4%, p = 0.040). Patients with mRS≤2 had a lower mean baseline NIHSS (15.2±9.95 versus 22.6±9.50, p< .001). Time to puncture, utilization of BGC, general anesthesia use, number of passes, and successful recanalization (TICI≥ 2B) were not significantly different between the two cohorts. On multivariate analysis, higher baseline NIHSS was associated with worse functional outcome (OR:0.91, CI:0.87‐0.96, P< .001). Use of IV tPA was associated with higher odds of achieving good functional outcomes (OR:2.82, CI:1.06‐7.51, P:0.038). Conclusions In this pooled analysis of the NASA and TRACK Registries, posterior circulation patients achieving good outcome were more likely to have a lower baseline NIHSS and less comorbidities. Use of IV‐tPA and lower baseline NIHSS were independent predictors of functional outcome.