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Recent trials have shown evidence for a benefit from endovascular thrombectomy (EVT) for select patients with stroke who can be treated within the late window, defined as 6 to 24 hours after onset. Patients can be selected for treatment with use of either advanced imaging (comparing diffusion and perfusion imaging profiles) or computed tomography (CT) alone. Another approach is to evaluate presence of collateral flow.
For this randomized, partially industry-funded study, investigators recruited patients to compare EVT versus no thrombectomy in patients who could start EVT within the 6- to 24-hour time window after stroke. Patients were evaluated for collateral flow with single-phase CT angiography. Collaterals were designated as grade 0 (no …