Statistical analysis will be performed using the SPSS 20.0 statistical package. All enrolled patients will be divided into two groups according to CHA2DS2-VASC score. Clinical, laboratory, and procedural data will be compared with the use of Student t or Mann-Whitney U test for continuous variables (expressed as mean ± standard deviation for parametric variables, and median and interquartile ranges [25-75 percentile levels] for nonparametric variables) and chi-square test for categorical variables ( expressed as counts and percentages).