Researchers at the MRC medical center at Imperial College London receive magnetic resonance cardiac bleeding (EMN) for the first time. People who have a heart very affected by a large heart see that they have more bleeding than those who have had less heart. Therefore, by measuring hemorrhage, the EMN technique can be useful to know the effects of the heart. Heart attacks occur when one of the arteries that carries blood to the heart is blocked. The blood supply to the heart is interrupted and the heart runs out of oxygen.