By Marilynn Marchione A new study reports one of the biggest potential advances against heart failure in more than a decade -- a first-of-a-kind, experimental drug that lowered the chances of death or hospitalization by about 20 percent. Doctors say theaNovartis drug -- which doesn't have a name yet -- seems like one of those rare, breakthrough therapies that could quickly change care for more than half of the 6 million Americans and 24 million people worldwide with heart failure. "This is a new day" for patients, said Dr.