Ticagrelor versus aspirin

"Although some studies have suggested that the risk of stroke after transient ischemic attack has decreased in recent years, our trial confirms previous studies that have shown a high risk in the first 2 weeks, with particularly high event rates in the first 2 days.1,10,16 "

http://www.nejm.org/doi/full/10.1056/NEJMoa1603060#t=articleTop

So if you have a stroke and if there is a identified cause treatment is urgent. Example: endarterectomy or stenting for symptomatic carotid atheroma should not be delayed.