Table 2. ICD demographics in patients with HCM compared to coronary heart disease.

	CAD	HCM
Age at implant	∼65 years	∼40 years
Duration of risk	Short	Long
Myocardial substrate	Often compromised	Usually intact
Multi-organ disease	Frequent	Very rare
Ejection fraction as risk factor	Yes	No
Annual intervention rate	∼30%	∼5%

Notes.

CAD

coronary artery disease

ICD

implantable cardioverter defibrillator

HCM

hypertrophic cardiomyopathy