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[Catheter-induced modulation of the electric conductivity of the atrioventricular node by high-frequency current]
K P Kunze1, M Geiger, M Schlüter
1Universitätskrankenhaus Eppendorf, Abteilung Kardiologie, Hamburg.
Insights
Radio-frequency current successfully prolonged atrioventricular (AV) node conduction time in patients with supraventricular arrhythmias. This effective treatment led to symptom freedom for ten patients without further anti-arrhythmia medication.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Context:
- Supraventricular arrhythmias pose a significant clinical challenge.
- Atrioventricular (AV) node is a critical component in cardiac conduction.
- Catheter-based interventions offer targeted treatment options.
Purpose:
- To evaluate the efficacy and safety of radio-frequency current delivery to the AV node.
- To assess the impact on AV node conduction time and arrhythmia management.
- To determine long-term outcomes and complication rates.
Summary:
- Radio-frequency current was applied to the AV node in 13 patients with supraventricular arrhythmias.
- AV node conduction time significantly increased from 95 ± 43 ms to 168 ± 72 ms.
- Ten patients achieved symptom freedom post-treatment, with no complications reported during a five-month follow-up.
Impact:
- Demonstrates a novel, minimally invasive approach for managing supraventricular arrhythmias.
- Highlights the potential for radio-frequency ablation as a safe and effective alternative to traditional methods.
- Offers a promising treatment strategy for patients refractory to conventional therapies.
Abstract:
A radio-frequency current was delivered via a catheter to the atrioventricular (AV) node in 13 patients with supraventricular arrhythmias (maximal heart rate 215/min). In nine patients with atrial fibrillation, three with AV nodal re-entry tachycardia and one with AV re-entry tachycardia, AV node conduction time was prolonged from 95 +/- 43 ms to 168 +/- 72 ms. In three patients the radio-frequency current had no lasting effect, necessitating AV node ablation with a direct-current shock. During a mean observation period of five months, all ten patients in whom the radio-frequency current had been successfully applied remained free of symptoms without any anti-arrhythmia treatment. There were no complications during or after treatment.