Support WBURStudy Of Sudden Cardiac Death Exposes Limits Of Genetic TestingPlay03:50Download AudioRichard HarrisAugust 17, 2016 ShareThe condition known as hypertrophic cardiomyopathy, or HCM, is inherited and can be a killer. But some of the genetic mutations once thought linked to the illness are actually harmless, geneticists say. (Getty Images)
