盐酸戊乙奎醚对体外循环致大鼠脑损伤的影响

目的 评价盐酸戊乙奎醚对体外循环(CPB)致大鼠脑损伤的影响.方法 成年雄性SD大鼠30只,随机分为5组(n=6),假手术组(S组)仅进行动脉和静脉穿刺置管,CPB组、低剂量盐酸戊乙奎醚组(PL组)、中剂量盐酸戊乙奎醚组(PM组)和高剂量盐酸戊乙奎醚组(PH组)建立CPB模型,PL组、PM组和PH组分别在预冲液中加入盐酸戊乙奎醚0.2、0.6、2.0 mg/kg,CPB组加入等容量生理盐水.停CPB后2 h采集上腔静脉血样,测定血浆神经元特异性烯醇化酶(NSE)和S-100β蛋白浓度.然后取脑组织,透射电镜下观察海马区神经元的超微结构.结果 与S组比较,其余4组血浆NSE和S-100β蛋白浓度升高(P＜0.05);与CPB组和PL组比较,PH组和PM组血浆NSE和S-100β蛋白浓度降低(P＜0.05);与PM组比较,PH组血浆S-100β蛋白浓度降低(P＜0.05).PH组和PM组海马区神经元损伤程度轻于CPB组和PL组.结论 预充液中加入盐酸戊乙奎醚0.6或2.0 mg/kg可减轻CPB致大鼠脑损伤,且呈剂量依赖性.

Effect of penehyclidine hydrochloride on brain injury induced by cardiopulmonary bypass in rats

Objective To investigate the effect of penehyclidine hydrochloride on brain injury induced by cardiopulmonary bypass (CPB) in rats. Methods Thirty adult male SD rats were randomly divided into 5 groups ( n = 6 each): sham operation group (group S), CPB group, and low, median and high dose penehyclidine hydrochloride groups (group PL, PM , PH). Penehyclidine hydrochloride 0.2, 0.6 and 2.0 mg/kg were added to the priming solution in group PL, PM and PH respectively, while the equal volume of normal saline was added instead in group S. Blood samples were obtained at 2 h after termination of CPB to determine the plasma concentrations of neuron specific enolase (NSE) and S-100β protein. The brain tissues were taken to observe the ultrastructure of hippocampal neurons with electron microscope. Results The concentrations of NSE and S-100β protein were significantly higher in the other groups than in group S, while lower in group PM and PH than in group CPB and PL( P＜ 0.05). The S-100β protein concentration was significantly lower in group PH than in group PM( P ＜ 0.05). The damage to hippocampal neurons was significantly attenuated in group PM and Ps. Conclusion Penehyclidine hydrochloride 0.6 or 2.0 mg/kg can reduce the CPB-induced brain injury in a dose-dependent manner in rats.