IL6 and cardiac arrhythmia: In the present study, during routine CABG, there was a significant increase in the concentration of IL-6 and IL-8 in the group of patients with arrhythmia, which corresponds to the systematic review and meta-analysis results by Weymann A. et al. (2013) [17] and differs from the study of Bjorgvinsdottir L. et al. (2013) [18].