HAVCR2 and atrial fibrillation: Compared with the control group, the ratio of Th17 / Tim-3+ cells in the peripheral blood of patients in paroxysmal group and chronic group were significantly higher [(0.46 ± 0.23) vs (2.35 ± 0.95) vs (7.94 ± 1.92)], and the difference was statistically significant (F = 25.333, P < 0.05); Furthermore, the ratio of Th17 / Tim-3+ cells in peripheral blood of patients with AF in chronic group was significantly higher than that in paroxysmal group (t = 28.394, P < 0.05).