TABLE 86.6 LESION-SPECIFIC COMPLICATIONS Current Evidence Arrhythmias may occur in healthy individuals as well as in those with heart disease They may be congenital or acquired, fast or slow, and anywhere on the spectrum from benign to fatal Cardiac catheter ablation can cure most tachyarrhythmias and is safe in young patients Implantable pacemakers and defibrillators are small enough to be used in infants and children Many diseases that predispose patients to SCD may be identified by genetic markers, facilitating primary preventive therapy Clinical Considerations Clinical Recognition