Time is a critical element in the treatment of stroke, and now the Upstate Comprehensive Stroke Center has extended the amount of time that a clot-busting medication can be effective in some patients. Gene Latorre, MD, the medical director of the stroke service at Upstate University Hospital, explains how new software gives doctors a precise view of the area of the brain that is affected by an ongoing stroke, plus the regions that remain in jeopardy. He also explains how "collateral circulation" can reroute blood flow in the brain to avoid an area that is affected by stroke.