Table 3. Family history of red flags.

Any of the following findings in the family history should prompt further investigation:
Sudden cardiac death (aged <50 years)
Sudden infant death syndrome
Unexplained syncope, particularly if it occurs during physical activity
Seizures without objective ictal activity
Heart transplantation in the absence of coronary artery disease
Presence of a pacemaker and/or implantable cardioverter-defibrillator in a young person (aged <50 years)
Muscle weakness or myopathy
Individual who died of a supposed heart attack at a young age, in the absence of known coronary risk factors and with no autopsy performed.