"The problem with broken hearts is that they just keep breaking. While organs like your liver or skin excel at regenerating themselves after injuries, the heart is the class dunce. If its muscle cells, or cardiomyocytes, die during a heart attack, they are replaced by scar tissue rather than fresh muscle. This temporarily supports the damaged tissue but in the long term, it weakens the heart and increases the risk of more heart attacks. It’s no wonder that heart disease is the leading cause of death worldwide. By 2030, it’s estimated that failing hearts will kill more than 23 million people every year." says Ed Yong. There is some progress by Deepak Srivatsava who transformed some cells in the scar tissue into heart muscle says Ed Yong.