The brain, like all the other parts in the body, needs oxygen not only to work properly but also to stay alive. When brain cells don’t get enough oxygen, they start to die in just a few minutes. When blood flow to or within the brain is blocked or badly disrupted, oxygen can be cut off from a lot of brain cells at once. This can cause a stroke. Cardiologist Dr. Robert Segal, founder of Manhattan Cardiology, breaks down what happens before, during, and after a stroke. Read the article.