| Objective: This study sought to investigate the success,recurrence rate and atrioventricular block incidence ofatrioventricular nodal reentrant tachycardia (AVNRT) underwentradiofrequency ablation with intermittent energy delivery.Furthermore, to approve a safe and effective approach for thetreatment of AVNRT.Methods: From 1995 to 2000, 156 patients hospitalized(male76. female80, ages range from 10 to 70 years, mean age45 years) with typical AVNRT were retrospectively analyzed. Allof them underwent slow pathway modification with intermittentenergy dilivery. When appropriate target is located,radiofrequency energy is dilivered at power 25-30W If junctionalpremature beats appeared within 5 seconds, then theradiofrequency application lasted 5-10 seconds and stopped,when sinus rhythm restored, another 5-10 seconds ablation wasapplied. This procedure was repeated until total time of ablationreached 90-120 seconds. If the subsequent electrophysiologicaltest still precipitate AVNRT another target should be searchedand ablated with the same technique of energy delivery tillAVNRT could not be induced.Results: 155 patients were successfully ablated, the successrate was 99.36 % (l55/156), AVNRT recured in 2 patients within3 months after ablation, thc recurrence rate was l.28 % (2/l56),their arrhythmia were successfully eliminated by the secondablation. l patient complicated with permanent completeatrioventricular block (incidence 0.64 %)and underwentpermanent pacemaker imPlantation. l patient suffered from latecomplete 8trioventricular block 3 days after ablation, theatrioventricular conduction restored after the treatment ofdesamethasone.Conclusion: Intermittent energy delivery of radiofrequency ishighly successful with low recurrence rate fOr slow pathwayablation, meanwhile reducing the complication of completeatrioventricular block. This method is a safe and effectiveaPproach. |
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