CSF2 and atrial fibrillation: As shown in Table 3, compared to the control group, serum level of GM-CSF and plasma level of G-CSF were significantly decreased after irradiation (P < 0.001, P < 0.001), while levels of GM-CSF and G-CSF in PF-H (P < 0.001, P < 0.001) and AF-H significantly increased (P < 0.001, P < 0.001), respectively.