Compared with VCV group,IL-6 and TNF - of PCV-VG group 1 hour after OLV and 1 hour after the end of surgery were significantly lower ( P < 0.01 ) ( IL-6 : 52.32 3.59 vs 62.65 4.17 pg/ml and 63.57 4.98 vs 82.38 4.10 pg/ml ; TNF - : 3.23 0.27 vs 4.19 0.38 pg/ml and 4.01 0.28 vs. 5.49 0.31 pg/ml ) .