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Hypertrophic cardiomyopathy, or HCM, is the most common form of heart disease seen in cats. In Ragdolls, most cases of HCM are inherited from the parents and caused by a gene mutation. Fortunately, we have DNA tests that can detect if a specific cat is carrying the mutation. Unfortunately, we don’t have a cure for HCM at this time, although medications are available that may help some cats.