Effects of multiple doses of propofol on cognitive function in neonatal rats / 中华麻醉学杂志

ABSTRACT

Objective To investigate the effects of multiple doses of propefol on long-term cognitive function in neonatal rats.Methods Twenty-four 7-day old SD rats weighing 12-16 g were randomly divided into 3 groups(n=8 each)group Ⅰ control(C)received intraperitoneal(IP)normal saline(NS)7.5 ml/kg once a day × 7 daysgroupⅡ propofol 1(P1)received NS 7.5 ml/kg IP once a day×6 days+propofol 75 mg/kg IP on the 7 th day and group Ⅲ propofol 2(P2)received propefol 75 mg/kg IP once a day × 7 days.Learning and memory function were assessed using Morris water maze when the rats were 4 weeks old.The animals were decapitated immediately after the tests.The cortex and hippocampus were isolated for determination of aspartate (Asp),glutamic acid(Glu),glycine(Gly)and γ-aminobutyric acid(GABA)contents using high performance liquid chromatography(HPLC).Results Long-term learning and memory function significantly declined in group P2 as compared with group C and P1.The content of Asp in hippocampus and the Glu content and Glu/GABA ratio in cortex and hippocampus were significantly lower in group P2 than in group C and P1.There was no significant difference in Gly and GABA content in cortex and hippocampus among the 3 groups.Conclusion Multiple doses of propefol decreases long-term cognitive function by decreasing the levels of excitatory amino acid transmitters in the brain in neonatal rats.