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Abstract Objective To investigate the role of local voltage potentials (LVPs) in mapping the originating site of right ventricular outflow tract (RVOT) arrhythmia. Methods The occurrence rate of LVPs during mapping of RVOT arrhythmia, and the relative position of LVP to V potential during sinus rhythm and ventricular arrhythmia were retrospectively analyzed in 47 cases. Results Radiofrequency ablation was successful in all cases. Catheter ablation was performed at a mean of 8±6 sites per patient. LVPs were slightly earlier at effective ablation sites than at ineffective sites (- 28±8ms vs- 24± 7ms, P<0.05). The LVPs were recorded in 47 of 58 effective ablation sites (81.0%), but only in 22 of 318 ineffective sites (6.9%)(P<0.05). Ventricular arrhythmia reoccurred in two cases with no LVP in intracardiac electrogram during first abla-tion. LVP was recorded during repeat ablation. The positive and negative predictive values of LVP in discriminating effec-tive ablation sites were 68.4%and 93.1%, respectively. Conclusion LVPs may be one of features of successful ablation sites of RVOT arrhythmia and mapping of LVPs may improve success rate of ablation.
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