TNF and acute kidney injury: Biomarkers’ concentrations in the AKI group (Figure 1) were as follows: higher preoperative serum TNF-α (M = 2.7 (2.42–4.22) ng/mL vs. 2.13 (1.59–2.7) ng/mL in the control group, p = 0.012) and lower preoperative urine IL-18 (M = 19.93 (9.88–25.06) ng/mL vs. 31.05 (23.52–37.62) ng/mL in the control group, p = 0.009).