Management of Individuals with Family History of Cardiac Arrest

Understanding the Risk

The European Society of Cardiology recommends that individuals with a family history of cardiac arrest undergo comprehensive cardiovascular evaluation to identify potentially inherited cardiac conditions, as this family history confers significantly increased risk of sudden cardiac death 1
One parental history of sudden death increases relative risk by 1.89-fold, while two parental histories increase risk to 9.44-fold (p=0.01) 1

The American Heart Association suggests that the comprehensive evaluation must include personal clinical history focusing on syncope, seizures, palpitations, chest pain, or unexplained drowning/motor vehicle accidents 3
A detailed multigenerational family pedigree documenting exact circumstances of deaths, preceding symptoms, autopsy findings, and ages at cardiac events is recommended 4
A 12-lead electrocardiogram to screen for channelopathies and signs of cardiomyopathy is necessary 1, 4

Inherited channelopathies and cardiomyopathies typically cause sudden death in young individuals (<40 years) with structurally normal or minimally abnormal hearts 1, 3
Premature coronary disease (deaths <55 years in men, <65 years in women) suggests familial hyperlipidemia or accelerated atherosclerosis 4

Genetic testing should be undertaken at the direction of a cardiologist with expertise in inherited arrhythmia conditions, with a diagnostic yield in families 4 times higher when there is a survivor of sudden cardiac arrest compared to families with sudden cardiac death 3, 9

The European Society of Cardiology recommends implantable cardioverter-defibrillator (ICD) for high-risk individuals with documented ventricular arrhythmias or specific high-risk features 7, 8
Beta-blockers are recommended for long QT syndrome and catecholaminergic polymorphic ventricular tachycardia 1

The American College of Cardiology advises against relying on symptoms alone, as many inherited cardiac conditions causing sudden death are asymptomatic until a fatal event occurs 9, 4
A normal resting ECG does not exclude life-threatening conditions like catecholaminergic polymorphic ventricular tachycardia or early hypertrophic cardiomyopathy 4