1. From the Departments of Neurology (A.L.F., N.K., T.S., P.P., J.-M.L.), Emergency Medicine (P.P.), and Radiology (J.-M.L.), Washington University School of Medicine, St Louis, MO; the Emergency Department (J.A.W.), Neurology and Neurosurgery Center (M.S.), and Pharmacy (C.M.), Barnes-Jewish Hospital, St Louis, MO.