Stroke
Overview Treatment Stroke is a Medical Emergency. Call 911. Stroke is a type of cardiovascular disease that affects the arteries leading to and within the brain. A stroke occurs when a blood vessel that carries oxygen and nutrients to the brain is either blocked by a clot or bursts. Time is critical in stroke treatment. The faster you are taken to an emergency room, the better your chance for a positive outcome. Stroke Strikes BE FAST Not sure whether a person's symptoms are a stroke? B.E.F.A.S.T. and quickly check for any of these signs of stroke:.