Cardiomyopathy, Familial Hypertrophic, 8, is also known as hypertrophic cardiomyopathy 8, and has symptoms including dyspnea on exertion An important gene associated with Cardiomyopathy, Familial Hypertrophic, 8 is MYL3 (Myosin Light Chain 3). Affiliated tissues include heart and skeletal muscle, and related phenotypes are congestive heart failure and hypertrophic cardiomyopathy