• G-X Lin, T Wang, M-H Chen, Z-H Hu, and W Ouyang.
• Department of Anesthesiology, The Third Xiangya Hospital of Central South University, Changsha, China.
• Acta Anaesthesiol Scand. 2014 Jul 1;58(6):668-74.

BackgroundAccumulating evidence has indicated that inflammation may act as a potential mechanism underlying post-operative cognitive dysfunction (POCD). High-mobility group box 1 (HMGB1), as a known late mediator of inflammation, is involved in the development of post-operative complications. Thus, we sought to determine the role of HMGB1 in reflecting POCD following major gastrointestinal surgery.MethodsFifty-three elderly patients undergoing gastrointestinal surgery were recruited, and 50 patients completed the study. Serum HMGB1 and interleukin (IL)-6 levels were measured pre-operatively and at 6 h, day 1 and day 3 post-operatively. Neuropsychological tests were administered before and 1 week after surgery. POCD was determined using a Z score ≥ 1.96.ResultsSeventeen (34%, 17/50) patients developed POCD at 1 week. The POCD group had higher serum HMGB1 levels at day 1 (12.15 ± 3.12 vs. 9.91 ± 3.15 ng/ml, P = 0.021) and day 3 (11.04 ± 2.88 vs. 8.52 ± 3.31 ng/ml, P = 0.011). IL-6 levels at 6 h (51.18 ± 15.22 vs. 39.20 ± 14.32 pg/ml, P = 0.009) and day 1 (41.59 ± 11.08 vs. 33.81 ± 11.42 pg/ml, P = 0.026) were significantly higher in POCD patients. Serum values of IL-6 at 6 h, HMGB1 at day 1 and levels of education showed positive correlations with Z scores. HMGB1 at day 3 and IL-6 at 6 h were independent risk factors.ConclusionsSerum HMGB1 and IL-6 levels increase significantly after major gastrointestinal surgery in elderly patients and such elevations are associated with the occurrence of cognitive decline after surgery.© 2014 The Acta Anaesthesiologica Scandinavica Foundation. Published by John Wiley & Sons Ltd.

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