PLAT and ischemic stroke: The observation that Black patients received tPA with a lower frequency than White patients may indicate that Black individuals arrive in the ED with a last known well that places them outside of the time window for thrombolytic treatment (at most 4.5 hours) with a greater frequency than White patients, or that Black individuals are presenting with more hemorrhagic strokes which are not amenable to tPA treatment, as opposed to ischemic strokes which are.