2.7 Statistical analysis
IBM SPSS Statistics software (version 20) was utilized to analyze the data. For checking the normality test of the data, the F-test or the t-test was used for the data in accordance with normal distribution; otherwise, the Kruskal-Wallis test was used. Two tailed P< 0.05 was set as statistical significance. The distance from the pacing electrode to the coronary artery was calculated as the mean ± standard deviation.