No one really knows for certain, as there is no CDC for pets, but likely it's a kind of heart disease called feline hypertrophic cardiomyopathy (HCM). (stevedalepetworld.com)
A strong heart may be healthy, but too much heart muscle can be fatal: A leading cause of sudden death in young people — particularly in world - class athletes — is a condition called hypertrophic cardiomyopathy, or enlarged heart. (sciencemag.org)
A cardiac examination allows us to follow a thorough investigative protocol to determine the presence and extent of hypertrophic cardiomyopathy in cats. (bracpet.com)