What is a Stroke?

A stroke—also called a cerebrovascular accident or "brain attack"—is a medical emergency where part of the brain is deprived of oxygen. This occurs when an artery that supplies oxygenated blood to the brain becomes damaged in one of several ways. Within minutes of being deprived of oxygen, brain cells begin to die. The longer the brain goes without oxygenated blood, the greater the chances of permanent damage.