Statistical analysis
All statistical analyses were performed using JMP 14 software (SAS Institute Inc., Cary, NC, USA). The data are presented as the mean ± standard error (SE) for continuous variables. The differences in lesion size (maximum lesion width, surface width, and lesion depth), LI rise, and LI drop among the three catheter angles were assessed by the analysis of variance in each CF, followed by post hoc analysis using the Tukey HSD test. The level of statistical significance was set at p <0.05.