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Figure 3 Kaplan-Meier analysis of freedom from recurrent arrhythmic events during follow-up according to the left ventricular ejection fraction (EF) before surgery. The difference between the groups was significant (p = 0.02) by the log-rank test. EF < 30% = the patient had an ejection fraction < 30%; EF 30% = the patient had an ejection fraction 30%.