Résumé
Objective To evaluate the effects of sevoflurane on learning and memory of neonatal mice .Methods 122 neonatalmice (7 days postnatal) were included in this study .72 of them were exposed to sevoflurane (1 .0 or 0 .5MAC ,minimum alveolar concentration) or 40% O2 for 2 h(hours) .Morris water maze was performed 4 and 12 weeks after anesthesia .Latency and swimming speed during training ,time on island and times across island during the research were recorded .The rest 50 mice was used in artery blood analysis during sevoflurane (1 .0 or 0 .5 MAC ,0 ,1 ,2 h) .Results pH ,PaO2 ,PaCO2 ,SaO2 were stable during anesthesia .Latency in control group were significantly shorter than the two anesthesia groups 4 weeks after anes-thesia and 3 days after the training .During the last 2 training days ,the latency in 1 .0 MAC sevoflurane-exposed mice were sig-nificantly longer than that of the 0 .5 MAC group .12 weeks after anesthesia ,the latency was still significantly longer in 1 .0 MAC sevoflurane-exposed mice on the last training day .The time on island and/or times across island were significantly decreased in anesthesia groupsduring theresearch performed 4 weeks and 12 weeks after anesthesia .Conclusion Early exposure to sevoflurane leads to a concentration and time-depended persistent learning and memory deficits to neonatal mice .