Not all patients are candidates for tPA because there are different types of strokes. But for those who can be helped by tPA, prompt treatment is the key. To be effective, the drug must be administered within three hours of the onset of symptoms, so it is imperative that medical and non-medical personnel recognize when a stroke may be in progress and take action quickly.

"The most important thing individuals and family members can do is to learn the warning signs of stroke," says Vicki Underwood, director of neuroscience at Fort Sanders Regional and Fort Sanders Parkwest. "Call 9-1-1 and seek medical help immediately if you think a stroke is occurring."