Great post, as a paramedic, I really loved this. The three hour window is so they can get rtp or thrombolytics which are clot busters, on board. Research now is expanding that window to even 8 hours here now. This means you can get them on board within 8 hours of when the stroke started. It is extremely important to try and figure out when it started so a good question to always ask is when they were last seen normal. Another thing to add is that there are two different strokes, you have ischemic and hemorrhagic strokes. If you give rtp to a hemorrhagic stroke, it WILL kill the patient. It is only used for ischemic strokes along with aspirin and heparin. A ct scan is the only way to confirm what kind of strokes it is. Sorry about the grammar and spelling, I'm on my mobile.