Hypertrophic cardiomyopathy (HCM)

Autosomal dominant structural cardiomyopathy characterised by asymmetric septal hypertrophy (septal:free-wall thickness ratio > 1.3) and microscopic myocyte disarray covering > 5 percent of the ventricular cross-section. Leading structural cause of sudden cardiac death in young athletes in the UK, Italy, and US autopsy series.