Copyright © 2001 by the European Society of Cardiology.
Targeting the slow pathway for atrioventricular nodal reentrant tachycardia: initial results and long-term follow-up in 379 consecutive patients
Department of Cardiology and Angiology, Westfaelische Wilhelms-Universitaet, Meunster, Germany
revised January 10, 2000; accepted January 14, 2000
Abstract
Objectives This study is designed to examine the immediate and short-term outcomes of patients who have undergone slow pathway ablation/modification for atrioventricular nodal reentrant tachycardia.
Background Targeting the slow pathway has emerged as the superior form of treatment for atrioventricular nodal reentrant tachycardia. This technique has been found effective and is associated with a low complication rate. However, little is known of the long-term outcome of patients undergoing this procedure.
Methods Over a 40-month period the slow pathway was targeted in 379 consecutive patients with proven atrioventricular nodal reentrant tachycardia. The case records of all patients were examined. Accurate follow-up data is available in 96% of patients a mean of 20·6 months after the procedure.
Results The initial success rate was 97%. The incidence of complete heart block was 0·8% and the mean fluoroscopy duration was 27·3min. The recurrence rate was 6·9%. Age, number of pulses and fluoroscopy time were positively associated with either initial failure or recurrence. A total of 11·3% of patients were still taking antiarryhthmic medication at follow-up.
Conclusions Targeting the slow pathway is an effective form of treatment for atrioventricular nodal reentrant tachycardia. The technique has a high initial success rate, a low complication rate and a low recurrence rate at long-term follow-up. Slow pathway modification is associated with similar success rates and recurrence rates as slow pathway ablation and may confer theoretical long-term benefits.
Key Words: Atrioventricular nodal reentrant tachycardia, slow pathway, radiofrequency ablation
f1 Correspondence: Jonathan R. Clague, MD, Department of Cardiology, Royal Brompton Hospital, Sydney Street, London SW3 6NP, U.K.
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