Statistical analyses
Continuous variables were expressed as mean ± standard deviation or median (25th–75th percentile). Chi-squared (χ2) analysis or Fisher’s exact test was used for categorical variables. Data were analyzed with one-way analysis of variance or Student’s t-test. A P value <0.05 was considered statistically significant. Kaplan-Meier survival curve analysis with log-rank tests was applied to examine the survival-free from AF recurrence in the samples of this study. Multivariate logistic regression included variables with P <0.05 on univariate analysis. It was used to analyze the risk factors of MI reconnection with results expressed as odds ratios with 95% confidence intervals. JMP version 14.3 (SAS institute Inc, Cary, NC, USA) was used to perform these statistical analyses.