showed a trendp = 0.08
Moreover, low tidal volume ventilation increased the levels of glutamate ( p < 0.01), glycerol ( p < 0.05) and showed a trend towards higher lactate to pyruvate ratio ( p = 0.08) in cerebral microdialysate as well as higher levels of S-100B ( p < 0.05) in jugular venous plasma compared with medium–high tidal volume ventilation.