The first line of defense for an ischemic stroke is the intravenous delivery of tissue plasminogen activator (tPA) within 3 to 4.5 hours of stroke symptoms. Administering tPA dissolves the blood clot and re-establishes blood flow to the brain.
But in stroke patients battling large blood clots, new stroke treatment guidelines recommend the treatment of a stent retrieval device if a blood clot should not dissolve after tPA is given.
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