Considering that UB prevalence using conventional mapping was 9–33%, based on previous studies [7], and expecting that UB prevalence using UHD mapping was 9% or less, a sample size of 30 patients was calculated to achieve a power of 90% and to detect a significant difference with a two-sided 0.05 alpha level (epiR package 0.9-96, Melbourne, Australia). The statistical analysis was made with Excel (San Diego, CA, USA). Categorical variables are described as numbers and percentages. Continuous variables are described as mean ± SD for variables with normal distributions or as median with range for variables not normally distributed.

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