My Lords, there is, I understand, no intervention capable of restoring heart function some hours after a heart attack. The only exception is not applicable to heart attacks but to people who have had circulatory arrest due to hypothermia-for example, people who have been buried in avalanches or immersed in very cold water. That area is currently being researched. It is only in a very limited number of circumstances that ECMO support can improve a patient's chances of survival following cardiac arrest-usually in patients who suffer in-hospital cardiac arrest following surgery.