Heart attack ends your life; it stops the heart beat all of a sudden. This is what people assume it to be. While this is partially correct, the other half of the truth lies in the symptoms that are seen just before and/or during a heart attack. And it is this part of the truth that can actually save a life.
Usually the victims of a heart attack are unable to figure out if they are having an attack. It is partly because they are not aware of the signs and symptoms associated with it and partly because of the panic.