Figure 3: The cumulative recurrent rate of paroxysmal atrial fibrillation during the follow-up in different groups. In the second part of the study, we randomly assigned the successfully sinus rhythm reverted patients into one of the following three groups: 54 cases were given Wenxin Keli (9 g tid), 54 cases were given sotalol (40 mg bid), and 55 cases served as control. Kaplan-Meier analysis by Log-Rank χ2 test was used to determine the cumulative recurrent rate of paroxysmal atrial fibrillation in different groups during the one-year-long follow-up. Vertical axle was PAF recurrence free rate and horizontal axle was the follow-up time (WK = Wenxin Keli, PAF = paroxysmal atrial fibrillation).