Hereditary ventricular hypertrophy (CMH, HCM, ASH, or IHSS) in early stages produces a presystolic gallop due to an atrial heart sound, and EKG changes of ventricular hypertrophy. Progressive ventricular outflow obstruction may cause palpitation associated with arrhythmia, congestive heart failure, and sudden death. Familial hypertrophic cardiomyopathy-7 is caused by heterozygous mutation in the TNNI3 gene. (From OMIM)