摘要目的 观察七氟烷对小鼠短期内记忆能力及其对海马突触传递效能的影响.方法 昆明小鼠吸入七氟烷后12h、24h、72h,分别用Y型迷宫测试进行自发交替和活动能力,离体脑片细胞外记录技术观测海马短时程增强(STP)的变化.结果 与对照组比较,吸入1.5％七氟烷后12h可使小鼠的自发交替的百分率明显降低[(54.7±1.7)％,P＜0.01],活动能力明显下降(16.4±1.3,P＜0.01),在海马脑片上STP诱发后群峰电位(PS)幅值明显降低[(122.3±13.9)％,P＜0.05],但在吸入七氟烷后24h和72 h均无影响.在离体海马脑片直接应用七氟烷后,可使基础[(83.5±8.9)％,P＜0.01)]和强直后[(116.5±14.9)％,P＜0.01)]PS幅值降低,但冲洗后PS幅度可恢复.结论 七氟烷在短期内可明显抑制突触传递效能,损害记忆功能,但无远期作用.

abstractsObjective To investigate the effects of sevoflurane on short-term memory impairment and the relative synaptic mechanism.Methods At 12 h,24 h and 72 h after the mice were exposed to 1.5％ sevoflurane for 1h,the spontaneous alternation and locomotor activity was assessed by Y maze,the short term potentiation (STP) were measured with extracellular recording technique in hippocampal slices.Results At 12h after administration with sevoflurane in vivo,the spontaneous alternation ( (54.7 ± 1.7) ％,P＜0.01 ) and locomotor activity (16.4 ± 1.3,P ＜ 0.01 ) decreased significantly compared with that of control group,and the population spike amplitude after induction of STP ( ( 122.3 ± 13.9) ％,P ＜ 0.05 ) decreased significantly in hippocampal slices,but there was no different at 24h and 72h.After administration with sevoflurane in vitro,the basic ( ( 83.5 ± 8.9) ％,P ＜ 0.01 ) or titanic ( ( 116.5 ± 14.9) ％,P ＜ 0.01 ) population spike amplitude decreased significantly in hippocampal slices,but the amplitude could recovery after wash-out.Conclusion Sevoflurane can impair the shortterm memory by suppressing synaptic transmission in the near future but not the long future.