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Pediatric arrhythmias
1Services de cardiologie pédiatrique, Hôpital Necker Enfants-Malades, Paris, France.
Insights
Children with heart defects face severe arrhythmias despite surgery. Radiofrequency ablation offers a promising, low-morbidity treatment for symptomatic tachyarrhythmias, though long-term data is pending.
Area of Science:
- Pediatric Cardiology
- Electrophysiology
- Cardiac Surgery
Background:
- Children with corrected cardiac malformations increasingly develop severe arrhythmias.
- Atrial surgery and Fontan operations are linked to difficult-to-manage atrial tachyarrhythmias.
- The link between sudden death and ventricular tachycardias post-tetralogy of Fallot repair remains debated.
Purpose of the Study:
- To review current therapeutic options for symptomatic tachyarrhythmias in pediatric cardiac patients.
- To evaluate the role and efficacy of radiofrequency ablation in this population.
- To discuss the evolving indications for antiarrhythmic therapy and devices.
Main Methods:
- Review of current literature on pediatric arrhythmias post-cardiac surgery.
- Analysis of outcomes associated with radiofrequency ablation for supraventricular tachycardias.
- Discussion of pharmacologic therapies, antiarrhythmic surgery, and device implantation.
Main Results:
- Radiofrequency ablation shows encouraging initial results with low morbidity, particularly for supraventricular reentrant tachycardias.
- Antiarrhythmic agents like class Ic drugs and amiodarone are recommended first-line therapies, especially in young children.
- Implantation of cardioverter-defibrillators is a new option for life-threatening ventricular arrhythmias.
Conclusions:
- Radiofrequency ablation is a viable alternative to long-term drug or surgical therapy for pediatric tachyarrhythmias.
- Long-term follow-up is needed to fully establish the role of ablation in children.
- Antiarrhythmic surgery indications are decreasing, while device implantation offers new hope for severe cases.
Abstract:
As children with cardiac malformations grow older, it appears that although their hemodynamic abnormalities may have been corrected by surgery, an increasing number of these patients have severe and possibly lethal arrhythmias. Atrial surgery and Fontan-type operations are complicated by atrial tachyarrhythmias that are difficult to predict and control. The relation between sudden death and ventricular tachycardias in patients who have undergone tetralogy of Fallot repair is still controversial. Application of radiofrequency energy now offers an alternative to pharmacologic therapy and surgery for children who have symptomatic tachyarrhythmias and need life-long therapy. Initial results are encouraging, with a very low morbidity, especially for children who have supraventricular reentrant tachycardias due to accessory pathways. However, the place of ablation in children is not yet fully delineated, as long-term follow-up evaluations are still lacking at this time. For this reason, antiarrhythmic agents, including class Ic drugs and amiodarone, should be tried first, especially in very young children. Indications for antiarrhythmic surgery are becoming very rare, due to the introduction of ablation techniques. For children who have life-threatening ventricular arrhythmias, implantation of a cardioverter-defibrillator represents a new therapeutic option, one that may also be used as a bridge to heart transplantation.