Adults who test positive for a mutation associated with the development of hypertrophic cardiomyopathy (HCM) but who have not manifested left ventricular hypertrophy (LVH) at the time of that diagnosis are now commonly identified in the era of genetic testing. There are little published data, however, on the long-term outlook for these phenotypically normal gene carriers.
McTaggart DR, et al. A Long Term Follow-up Study of Carriers of Hypertrophic
Cardiomyopathy Mutations. Heart, Lung and Circulation (2016), http://dx.doi.org/10.1016/j.hlc.2016.04.019