title: Hypertrophic cardiomyopathy.
abstract: BACKGROUND
  Hypertrophic cardiomyopathy (HCM) is one of the most common inherited cardiac disorders, with a prevalence in young adults of one in 500 and is defined by its wall thickening.
  
  
  METHODS
  This chapter of the supplement will present major clinical impacts of this disorder in its predilection to be inherited; its reputation as the most common cause of sudden death in young, healthy, athletic individuals; and its potential to develop heart failure due to either diastolic or systolic dysfunction, so-called "burned out" HCM. Underlying etiologies; diversity of morphologic, functional, and clinical features; and variable age of onset that differentiate the childhood from the adult form of disease will be discussed based on the literature and clinical experience.
  
  
  RESULTS
  In children less than 1 year of age, hypertrophy associated with systolic dysfunction is common. In contradistinction, among apparently healthy young adults, the prevalence of echcocardiographically defined HCM was reported to be as high as 0.2% and associated with diastolic dysfunction. In addition, overlaping disorders such as infiltrative and energy-dependent forms of HCM coexist with other atypical features in childhood, further confounding the presentations, treatments, and outcomes compared to adult disease.
  
  
  CONCLUSIONS
  HCM in childhood has a variety of etiologies which may influence diagnostic testing, treatments, and outcomes.
authors: The Heart Center, Division of Pediatric Cardiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA. Jeffrey.towbin@cchmc.org
authors: Jeffrey A
authors: JA
authors: Towbin
mesh_terms: D000293:Adolescent; D000328:Adult; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis* / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D016757:Death, Sudden, Cardiac / Q000453:epidemiology* / Q000517:prevention & control*; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D055815:Young Adult