TNF and Hypertension: There were significant differences between the mean values of plasma concentrations of IL6 (4.5 ± 1.8 vs. 6.9 ± 2.3, p = 0.02), renin (22 ± 7 vs. 35 ± 10, p = 0.01), TNF (4.8 ± 1.7 vs. 7.2 ± 2.1, p = 0.01) and vWF (140 ± 30 vs. 170 ± 40, p = 0.03) between patients with and without postoperative hypertension.