If patients with clot-caused strokes obtain medical care more than 4½ hours after their symptoms are noticed, it is too late to receive the standard clot-busting medication alteplase. However, in this study from China, tenecteplase appears to lengthen the window for additional stroke treatment to up to 24 hours, according to preliminary, late-breaking science presented today at the American Stroke Association’s International Stroke Conference 2022.