Comparison of S100β levels, and their correlation with hemodynamic indices in patients undergoing coronary artery bypass grafting with three different anesthetic techniques.

Cardiac surgery with aid of cardiopulmonary bypass (CPB) is associated with neurological dysfunction. The presence of cerebrospecific protein S100β in serum is an indicator of cerebral damage. This study was designed to evaluate the influence of three different anesthesia techniques, on S100β levels, in patients undergoing coronary artery bypass grafting on CPB. A total of 180 patients were divided into three groups - each of who received sevoflurane, isoflurane and total intravenous anesthesia as part of the anesthetic technique, respectively. S100 were evaluated from venous sample at following time intervals - prior to induction of anesthesia (T1), after coming off CPB (T2); 12 h after aortic cross clamping (T3) and 24 h after aortic cross clamping (T4). In all three groups, maximal rise in S100β levels occurred after CPB which gradually declined over next 24 h, the levels at 24 h post-AOXC being significantly higher than baseline levels. Significantly low levels of S100β were noted at all postdose hours in the sevoflurane group, as compared to the total intravenous anesthesia (TIVA) group, and at 12 and 24 h postaortic cross clamp, in comparison to the isoflurane group. Comparing the isoflurane group with the TIVA group, the S100 levels were lower in the isoflurane group only at 24 h postaortic cross clamp. It was concluded that maximum rise in S100β levels occurs immediately after CPB with a gradual decline in next 24 h. The rise in S100β levels is significantly less in patients administered sevoflurane in comparison to isoflurane or TIVA. Hemodynamic parameters had no influence on the S100β levels during the first 24 h after surgery.