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Among 174 patients with Wolff-Parkinson-White syndrome, 13(17.5%) had multiple atrioventricular(AV) accesory pathway. Twenty-one of the 29 pathways were identified by baseline electrophysiologic study and eight were found after the radiofrequency ablation of the initial ones. Bilateral ablation approach was tried in four patients and unilateral approach in nine. Twenty-seven of the pathways (93.1%) were eliminated permanently after a mean of 32±14 pulses of current delivery. There were no complications. The pulses was more and the procedure took more time (3.6±0.8hr) in the group compared to those in single pathway ablation (14 11 and 2.1-+ 0.8 hr respectively, P<0.05). The success ra±rate was identical in the two patient populations (93.1% vs 94.0%, P>0.05). However, the recurrence in multiple pathway ablation(7.6%) was more than that in single pathway ablation (1.9%, P < 0.01). Conclusion: radiofrequency catheter ablation is a safe and effective modality for tachyarrhythmias mediated by multiple acc
Among the 174 patients with Wolff-Parkinson-White syndrome, 13 (17.5%) had multiple atrioventricular (AV) accesory pathway. Twenty-one of the 29 pathways were identified by baseline electrophysiologic study and eight were found after the radiofrequency ablation of the initial ones Bilateral ablation approach was tried in four patients and unilateral approach in nine. Twenty-seven of the pathways (93.1%) were eliminated permanently after a mean of 32 ± 14 pulses of current delivery. the procedure took more time (3.6 ± 0.8 hr) in the group compared to those in single pathway ablation (14 11 and 2.1 - + 0.8 hr respectively, P <0.05). The success ra ± rate was identical in the two patient populations ( 93.1% vs 94.0%, P> 0.05). However, the recurrence in multiple pathway ablation (7.6%) was more than that in single pathway ablation (1.9%, P <0.01). Conclusion: Radiofrequency catheter ablation is a safe and effective modality for tachyarrhythmias media ted by multiple acc