Overview
Re-entrant atrioventricular (AV) tachycardia involves abnormal electrical circuits within the AV node or between atria and ventricles, leading to rapid heart rates. 1Diagnosis
Electrocardiogram (ECG) essential for identifying characteristic tachycardia patterns.
Electrophysiology study may be required for definitive diagnosis and mapping of re-entrant circuits.
Holter monitoring useful for detecting intermittent episodes 1.Management
First-line treatments:
- Antiarrhythmic drugs: Class Ic (e.g., flecainide) or Class III (e.g., amiodarone) 1.
Adjunctive treatments:
- Electrical cardioversion for unstable patients.
- Catheter ablation targeting the slow pathway in AV nodal reentrant tachycardia (AVNRT) 1.Special Populations
Cryoablation outcomes: Transient AV block observed post-ablation without recurrence of tachycardia in two cases, suggesting potential procedural risks 1.Key Recommendations
Catheter ablation is effective for treating AV nodal reentrant tachycardia with low recurrence rates post-procedure 1 (Evidence: Strong).
Monitor for transient conduction disturbances post-cryoablation, as they may occur without impacting long-term efficacy 1 (Evidence: Moderate).
Consider antiarrhythmic medications as adjunctive therapy in cases where catheter ablation is not feasible or fails 1 (Evidence: Expert opinion).References
1 González-Torrecilla E, Arenal A, Atienza F, Almendral J. Transient atrioventricular block shortly after uneventful cryoablation of atrioventricular nodal re-entrant tachycardias: report of two cases. Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology 2007. link