*median; Abbreviations: AF=atrial fibrillation, CPB=cardiopulmonary bypass, ECG=electrocardiogram, LAAO=left atrial appendage occlusion, m=month, MV=mitral valve, NR=not reported, NRSI=nonrandomized study, PVI=pulmonary vein isolation, RCT=randomized controlled trial, XCT=cross clamp time
Table 2 . Randomized controlled trials: main characteristics and risk of bias assessment.