TNNI3 and atrial fibrillation: Various biomarkers (cardiac troponin I, creatine kinase, creatine kinase - isoenzyme MB (muscle/brain), high-sensitive cardiac troponin T, high-sensitive C-reactive protein, plasma B-type natriuretic peptide, etc.) were studied as long-term predictors of AF recurrence after the index PVI (4-8).