Volume Optimisation and Cognitive Function in Major Abdominal Surgery

LiDCO Rapid, unilateral INVOS and unilateral BIS monitors will be applied. Should there be pre-existing carotid stenosis, INVOS sensor will be applied on the same side. In case of pre-existing cerebral pathology, the INVOS sensor will be applied to the contralateral side. Baseline values of nominal stroke index (SI), cardiac index (CI), BIS, mean arterial pressure (MAP) and regional oxygen saturation (rSO2) will be recorded. Basal rSO2 will be recorded prior to preoxygenation which raises the value. • Before the induction, up to 250ml of balanced crystalloid solution will be administered. These will include antibiotics solvents and other pre-induction i.v. therapy.

Before the induction, up to 250ml of balanced crystalloid solution will be administered. These will include antibiotics solvents and other pre-induction i.v. therapy.