• Not all arrhythmias are amenable to catheter
• Highest success rates are for SVT due to accessory connections
or for atrioventricular nodal reentry tachycardia.
• Automatic atrial tachycardias, especially due to a single automatic
focus, are amenable to ablation, with slightly lower success rates
• Ablation of ventricular tachycardias: Lower success rate than
• Primary electrical disorders, such as long QT syndrome, are not
amenable to catheter ablation.
• Availability of noncontact mapping systems and “global positioning” systems
reduces fluoroscopy time.
• Neonatal SVT often improves substantially during first 18 months
of life and frequently recurs later, such as ages 5–8 and
• Delaying intervention until child is older and larger may be