According to the news item, researchers can predict a heart attack by

A new way of scanning the heart can identify those who may be at high risk of a heart attack, early tests suggest. It can identify dangerous plaques in the arteries which nourish the heart. If a fatty plaque ruptures, it can lead to a clot, blocking the flow of blood. Scientists at the University of Edinburgh said an effective tool for predicting a heart attack would make a "massive difference" to patients. Experts said it was an exciting start.
    The researchers used a radioactive tracer which can seek out active and dangerous plaques. This was combined with high resolution images of the heart and blood vessels.(6)The overall effect is a detailed picture of the heart with the danger zones clearly highlighted. The technology is already used to detect tumours in cancer patients. The first tests of the technique for danger spots in the heart were on 40 patients who had recently had a heart attack.