Abstract TP140: Association Between Optimal Mismatch Ratio And Favorable Outcome By ASPECTS And Ischemic Core Volume

Purpose: We aimed to clarify the association between optimal mismatch ratio and favorable outcome of acute ischemic stroke-large vessel occlusion (AIS-LVO) patients who underwent endovascular therapy (EVT) by Alberta Stroke Program Early Computed Tomographic Score (ASPECTS) and ischemic core volume (ICV). Methods: We enrolled consecutive patients from 2017 to 2021 with prestroke modified Rankin scale (mRS) scores of 0 to 2 who were available for computed tomography perfusion or perfusion-weighted imaging before treatment and underwent EVT for anterior AIS-LVO within 24 hours from onset. Patients with ICV less than 10 mL or those who did not achieve successful recanalization with extended Thrombolysis In Cerebral Infarction scale score ≥2b were excluded. We dichotomized patients by ASPECTS (≥6 and 70 mL). Sensitivity and specificity were calculated from receiver operating characteristic (ROC) curve and to identify the optimal mismatch ratio for achieving favorable outcome, defined as mRS score 0 to 2 at 3 months. Results: Eighty patients (women, 31; median age, 75 [interquartile range (IQR), 69-83] years; median NIHSS score, 19 [14-24]; median ASPECTS, 7 (IQR, 6-9); median ICV, 32 (IQR, 16-64) mL] were enrolled. Of these, 45 (56%) patients had favorable outcomes. The threshold of optimal mismatch ratio for favorable outcomes were 11.2 in patients with ASPECTS ≥6 [area under curve (AUC) 0.55, P=0.47; sensitivity 0.25, specificity 0.92], 3.1 in those with ASPECTS Conclusions: The cut-off values of optimal mismatch ratio for favorable outcomes were 11 in patients with ASPECTS ≥6 or ICV