No difference of atrial IL-6 levels was observed among the three groups (Fig. 2C), and no correlation was found between TLR2 and IL-6 levels in PaAF patients (r = 0.408, P = 0.131, Fig. 4A), PeAF patients (r = 0.090, P = 0.706, Fig. 4B), and AF patients (r = -0.301, P = 0.079, Fig. 4C). Here, TLR2 is linked to atrial fibrillation.