An over-the-counter cough suppressant can knock some heart cells back into rhythm, a finding that may lead to a new way to treat a rare heart condition called long QT syndrome. In people with long QT syndrome, heart cells are not always ready to produce the next beat, a situation that can knock the heart out of its normal rhythm, which may be life-threatening. For many people with long QT, no treatment can correct the heart cells or prevent arrythmia. Heart cells in a dish The cough suppressant discovery began several years ago when Yazawa found that heart cells in...