Table 2

Types of HCM and approximate incidence1-150

Types of HCM Incidence (%)
Left ventricular involvement
 Asymmetrical hypertrophy95
  Ventricular septal hypertrophy 80
  Apical hypertrophy 9
  Midventricular hypertrophy4
  Rare types2
 Symmetrical (concentric) hypertrophy 5
Right ventricular involvement
  • 1-150 At the Toronto General Hospital where approximately 1300 patients are registered in the HCM clinic. The incidence of the different types of HCM varies considerably among different centres.