The Change of GFAP or S100B Concentration in Serum Before and After Carotid Artery Stenting
Abstract In this study we monitored the concentration change of the cerebral biomarkers Glial fibrillary acidic protein (GFAP) and S100B Protein (S100B) in serum of the patients, who were performed with carotid artery stenosis before and after carotid artery stent implantation. In total, thirty patients with unilateral carotid stenosis who underwent carotid artery stenting and had no complications were enrolled in the carotid artery stenting (CAS) group. The blood samples of operation patients were collected on three different time points: T1: the day before operation; T2: one day after operation (24 hours); T3, three days after operation (72 hours). Thirty patients who were excluded for carotid artery stenosis by Digital Subtraction Angiography (DSA) were selected as the control group. The blood samples of patients in control group were collected at D1 (before DSA) and D2 (24 hours after DSA). The concentrations of GFAP and S100B in serum from patients of both groups were measured with ELISA. The results showed that the serum concentrations of GFAP and S100B in control group did not change significantly before and after DSA (P>0.05); while the serum concentrations of GFAP and S100B was higher in the CAS group before operation than those in DSA group(P<0.05). In the operation group, GFAP and S100B increased significantly on the first day after operation (T2) and decreased gradually on the third day after operation (T3) but increased compared with that before operation (T1) with statistical significance (P < 0.05). For patients with symptomatic stenosis before operation, the concentrations of GFAP and S100B in serum were higher than those in patients without symptomatic stenosis, and there was statistical difference between them (P < 0.05), but there was no statistical significance between them after operation (P > 0.05). So we confirm the cerebral biochemical markers GFAP and S100B have a certain change trend after CAS, which can be used as the cerebral biochemical markers in the pre-operative evaluation and post-operative efficacy in monitoring of carotid stent implantation.