P132 Prognostic value of thrombus location and collateral status in basilar artery occlusion: single-centre retrospective cohort study

<h3>Introduction</h3> Endovascular Therapy (EVT) is an effective treatment for Basilar Artery Occlusion (BAO), but selecting the right patients can be challenging. Therefore, a prognostic model such as the Basilar Artery on Computed Tomography Angiography (BATMAN) score may help predict outcomes and guide patient selection. <h3>Aim of Study</h3> To assess the prognostic value of BATMAN score in predicting good functional status for BAO patients treated with EVT. <h3>Methods</h3> We conducted a single-centre retrospective cohort study and analysed data from all consecutive patients who underwent EVT for BAO between January 2015 and September 2023. Patients were divided into 2 groups according to BATMAN score: good BATMAN score (gBS) group (values 7-10) and poor BATMAN score (pBS) group (0-6). Primary outcome was good functional status classified as modified Rankin Scale (mRS) score 0-3. Safety outcomes were symptomatic intracranial haemorrhage (sICH) and 90day mortality. <h3>Results</h3> 55 patients were included in the analysis (23 gBS/32 pBS). Baseline characteristics did not differ significantly between groups. Good functional status occurred in 14 patients (61%) in gBS group and in 9 patients (28%) in pBS group (OR, 3.98; 95% CI, 1.27 to 12.41; P=0.026). sICH occurred in 1 patient (4%) in gBS group and in 3 patients (9%) in pBS group (RR, 0.46; 95% CI, 0.051 to 4.18; P=0.479). Mortality at 90 days was 26% in gBS group and 69% in pBS group (RR, 0.38; 95% CI, 0.18 to 0.78, P=0.0018). <h3>Conclusion</h3> BATMAN score seems to be a reliable prognostic tool for patients with BAO undergoing EVT. <h3>Disclosure of Interest</h3> no.