LRPAP1 and atrial fibrillation: Next, we found that the incidence of atrial fibrillation after transfection with the miR-21 inhibitor lentiviral vector decreased from 89 % in the RAP group to 50 % in the lentiviral group (8 of 9 in the RAP group, 5 of 10 in the RAP+miR-21 inhibitor group).