Inclusion criteria
HCM
Written informed consent.Age 18–75 inclusive.*HCM, as defined by the ESC HCM guidelines as ‘a wall thickness≥15 mm in one or more LV myocardial segments that is not explained solely by loading conditions’(It is recognised that in the ESC guidelines, a clinical diagnosis of HCM in first-degree relatives requires a wall thickness that is less than this value; however, ≥15 mm is applied here in order to ensure that all participants have an unequivocal phenotype).NYHA class I, II or III at the most recent clinical assessment performed prior to the baseline visit.