For years, the mantra of neurologists treating stroke victims has been "time equals brain." That's because getting a patient to the emergency room quickly to receive a drug that dissolves the stroke-causing blood clot can make a significant difference in how much brain tissue is saved or lost.
But specific information has been limited on just how the timing of giving the intravenous drug — known as a tissue plasminogen activator, or tPA — influences outcomes for victims of ischemic (clot-caused), stroke, the most common type of stroke.