Stroke treatment can be given even later than we thought.

Sept. 24, 2008 – The brain clot-busting drug tPA works better the sooner it’s given after stroke, but now a new study shows the treatment can help even if given up to 4.5 hours later.

During a stroke, a clot blocks the flow of blood to parts of the brain. It doesn’t take long for these parts of the brain to start dying. The clot-dissolving drug tPA (tissue plasminogen activator) restores blood flow to the brain, but the drug must be given soon after a stroke to save brain tissue.

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