HAVCR2 and atrial fibrillation: After statistics, compared with the control group, the proportion of Tim-3+ cells in the peripheral blood of patients with atrial fibrillation in the paroxysmal and chronic groups were significantly decreased [(4.45± 0.38)% vs (2.75± 0.34)%, vs (1.12± 0.26)%], and the difference was statistically significant (F= 13.287, P < 0.05); while further pairwise comparison showed that the proportion of Tm-3 cells in the peripheral blood of patients with atrial fibrillation in the chronic group was also significantly lower than that in the paroxysmal group, (t = 15.627, P < 0.05).