Comparison of TNF-α, IL-6, IL-8, SOD, and MDA levels at different time points. A: Comparison of TNF-α at different time points; B: Comparison of IL-6 at different time points; C: Comparison of IL-8 at different time points; D: Comparison of SOD at different time points; E: Comparison of MDA at different time points. Compared with control group, *P<0.05. T0: before anesthesia induction, T1: immediately after endotracheal intubation, T2: 1 h after one-lung ventilation; T3: 10 min before the end of operation. TNF-α: tumor necrosis factor-α; IL-6: interleukin-6; IL-8: interleukin-8; SOD: superoxide dismutase; MDA: malondialdehyde.