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Incidence and management of dysrhythmias after Fontan procedure
1Section of Pediatric Cardiology, Mayo Clinic, Rochester, Minnesota.
Insights
The modified Fontan procedure can cause various heart rhythm problems, including fast tachycardias and slow bradycardias. Effective management requires a comprehensive approach to these complex arrhythmias after surgery.
Area of Science:
- Cardiology
- Pediatric Cardiology
- Cardiac Surgery
Background:
- The modified Fontan procedure is a critical intervention for univentricular heart disease.
- Post-operative cardiac arrhythmias are a significant complication following the Fontan procedure.
Purpose of the Study:
- To comprehensively review the spectrum of cardiac arrhythmias after the modified Fontan procedure.
- To highlight the importance of diverse therapeutic strategies for managing these arrhythmias.
Main Methods:
- Review of existing literature on arrhythmias post-Fontan procedure.
- Categorization of tachyarrhythmias and bradycardias based on origin and type.
- Discussion of therapeutic options including medical management and pacemakers.
Main Results:
- The modified Fontan procedure leads to a wide range of tachycardias (supraventricular and ventricular) and bradycardias.
- Supraventricular tachycardias include atrial flutter, atrial tachycardia, atrial fibrillation, and junctional tachycardia.
- Bradycardias are often due to sinoatrial node dysfunction or atrioventricular conduction abnormalities.
Conclusions:
- A significant number of patients develop complex arrhythmias, including combined atrial tachyarrhythmias and sinoatrial node dysfunction.
- Successful treatment necessitates a full armamentarium of medical and pacemaker therapies.
- Ongoing research and clinical vigilance are crucial for optimizing outcomes in Fontan patients.
Abstract:
The modified Fontan procedure for univentricular heart disease results in the full spectrum of significant cardiac arrhythmias: tachycardias and bradycardias. The tachycardias are primarily supraventricular in origin: 1. atrial flutter, 2. primary atrial tachycardia, 3. atrial fibrillation, and 4. accelerated junctional rhythm or junctional tachycardia; however, ventricular tachyarrhythmias occur also, but less frequently. Bradycardia usually is a result of 1. sinoatrial node dysfunction resulting in junctional rhythm or 2. less commonly, atrioventricular conduction abnormalities, such as second degree and third degree atrioventricular block. Finally, the combination of atrial tachyarrhythmias and sinoatrial node dysfunction can occur in a small but significant number of patients after Fontan surgery. A complete array of medical and pacemaker therapeutic options is necessary for the physician to treat these difficult arrhythmias successfully.