Bones fix hearts? "Heart attack victims recover much more quickly if they are injected with stem cells taken from their own bone marrow. A study of more than 200 patients in Europe found those receiving stem cells had almost twice the improvement in their heart's pumping ability as patients given a placebo. Researchers from Goethe University in Germany said the new treatment not only limited damage to the heart but also regenerated heart cells. "The medications and interventional therapies available so far are intended only to limit further damage to the heart," said Andreas Zeiher, a professor at the university and senior author of the study. "In contrast, progenitor cell therapy has the potential not only to limit damage but to regenerate heart function.""