Abstract WMP20: The Basilar Artery on Computed Tomography Angiography (batman) Prognostic Score for Basilar Artery Occlusion

Background: Basilar artery occlusion (BAO) is associated with high risk of disability and mortality. This study aimed to assess the prognostic value of a new radiological score: the “Basilar Artery on Computed Tomography Angiography score (BATMANs)”. Methods: A retrospective analysis of consecutive stroke patients with a diagnosis of BAO on CT angiography (CTA) was performed. BATMANs is a 10 point CTA-based grading system. We allocated 1 point for each patent segment (proximal, middle and distal) of the basilar artery, 1 point for any patent intracranial vertebral arteries (VA), 1 point for each posterior cerebral artery (PCA) and 2 points for each posterior communicating artery (PcoM) or 1 point for hypoplastic PcoM ( Results: The derivation cohort (DC) included 83 patients with 41 in the validation cohort (VC). In receiver-operating-characteristic (ROC) analysis, BATMANs had an area-under-curve (AUC) of 0.81 (95%CI 0.7-0.9) in DC and an AUC of 0.74 (95%CI 0.6-0.9) in VC. BATMANs Conclusions: The addition of collateral quality to clot burden in BATMANs appears to improve prognostic accuracy in BAO patients.