Have we ever think of how cardiac arrest can overcome us? It is the sudden stoppage of blood supply or lack of oxygen from one or two coronary arteries to the heart muscle or even to the brain. There are many causes but no known cause yet which include heart attack, heart disease, spasm or choking. A common symptom is heart pain, spasm, usually caused by build up of plaque or fat like substances called atherosclerosis. This plaque can eventually rupture where blood clot will form and block the blood flow.

Befoe and After to how plague is formed and blocked the blood flow

Without immediate medical attention, the person will die within a few minutes. This is so if the blood supply is cut off for more than 5 minutes, not only brain injury will be the likely result but also muscle cells suffer permanent injury and can be fatal.

Coming up is the magnificent computer generated animation film illustrating how the plaque is formed, clotted and this triggers the heart attack.

The only on the spot cure is to have early cardiopulmonary resuscitation (CPR) and defibrillation. Defibrillation is delivering an electric shock to restore the heart rhythm to normal.
If the blood supply is cut off for more than a few minutes, muscle cells suffer permanent injury and die.

Hope by now you know how heart attack does happen and the below aninamation says it all, seeing is believing.

How a Heart Attack Occurs