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Catheter ablation of atrioventricular conduction
Insights
High-energy shocks to the atrioventricular conduction system effectively treated refractory supraventricular arrhythmias. This transvenous ablation technique resulted in significant symptom relief and heart block in most patients, with no major long-term complications.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Refractory supraventricular arrhythmias pose a significant clinical challenge.
- Conventional treatments may be insufficient for certain patient populations.
Purpose of the Study:
- To evaluate the safety and efficacy of transvenous high-energy shock ablation of the atrioventricular conduction system.
- To assess outcomes in patients with refractory supraventricular arrhythmias treated with this novel approach.
Main Methods:
- Thirty-five patients with refractory supraventricular arrhythmias were treated across three centers.
- High-energy shocks were delivered to the atrioventricular conduction system via a transvenous pacing catheter.
Main Results:
- Eighty-six percent of patients (30/35) became symptom-free without further therapy.
- Seventy-four percent (26/35) developed persistent complete heart block at a mean 10-month follow-up.
- No significant long-term complications were observed.
Conclusions:
- Transvenous ablation of atrioventricular conduction is a safe and effective method for managing refractory atrial and junctional arrhythmias.
- The procedure leads to high rates of symptom resolution and controllable heart block.
Abstract:
35 patients with refractory supraventricular arrhythmias were treated in three centres by high-energy shocks delivered to the atrioventricular conduction system from a conventional transvenous pacing catheter. After a mean interval of ten months, 26 patients (74%) had persistent complete heart block, 2 (6%) had intermittent complete heart block, and 3(9%) had first-degree heart block. 3 patients continued to have conducted atrial fibrillation, but with slower ventricular rates than previously, and 1 had normalisation of dual atrio-His conduction. In 1 patient a septal accessory pathway was ablated. 30 patients (86%) are completely symptom-free without additional therapy. There were no important long-term complications. Transvenous ablation of atrioventricular conduction is a safe and effective technique for treating a wide range of refractory atrial and junctional arrhythmias.