Zhiyuan Su1, Shiyuan Xu2, Tao Chen3, Junxing Chen3. 1. Department of Anesthesia, ZhuJiang Hospital of Southern Medical University, China Department of Anesthesia, The Third Affiliated Hospital of Guangzhou Medical University, China. 2. Department of Anesthesia, ZhuJiang Hospital of Southern Medical University, China xushiyuan355@163.com. 3. Department of Anesthesia, The Third Affiliated Hospital of Guangzhou Medical University, China.
Abstract
BACKGROUND: The authors tested the hypothesis that combined use of dexmedetomidine on fetal rats during isoflurane exposure in maternal anesthesia can attenuate the abnormal spatial learning and memory abilities in adults via the renin-angiotensin-aldosterone system. METHODS: Fifty timed-pregnancy rats were randomly assigned to five groups (Dex+Iso, Sal+Iso, Sal+Oxy, Dex+Oxy, and a control group ) on embryonic day 14 to receive five different dispositions, i.e. combined injection of dexmedetomidine (Dex) or saline (Sal) and inhalation of isoflurane (Iso), oxygen (Oxy), or normal air for 4 h (n = 10). RESULTS: The latency time(s) from day 1 to day 4 all showed a decreasing tendency in all four groups. The synaptic count of the Sal+Iso group was significantly lower than the Control group (p < 0.05), suggesting that severe neurodegeneration occurred under the influence of fetal isoflurane exposure. In contrast, the synapse count of the Dex+Iso group was near to that of Control group. The rats are protected in neurodevelopmental, normal development. CONCLUSION: Combine use of dexmedetomidine during exposure to isoflurane in utero during middle-pregnancy can attenuate the impairment of spatial learning and memory abilities for the rats in adulthood.
BACKGROUND: The authors tested the hypothesis that combined use of dexmedetomidine on fetal rats during isoflurane exposure in maternal anesthesia can attenuate the abnormal spatial learning and memory abilities in adults via the renin-angiotensin-aldosterone system. METHODS: Fifty timed-pregnancy rats were randomly assigned to five groups (Dex+Iso, Sal+Iso, Sal+Oxy, Dex+Oxy, and a control group ) on embryonic day 14 to receive five different dispositions, i.e. combined injection of dexmedetomidine (Dex) or saline (Sal) and inhalation of isoflurane (Iso), oxygen (Oxy), or normal air for 4 h (n = 10). RESULTS: The latency time(s) from day 1 to day 4 all showed a decreasing tendency in all four groups. The synaptic count of the Sal+Iso group was significantly lower than the Control group (p < 0.05), suggesting that severe neurodegeneration occurred under the influence of fetal isoflurane exposure. In contrast, the synapse count of the Dex+Iso group was near to that of Control group. The rats are protected in neurodevelopmental, normal development. CONCLUSION: Combine use of dexmedetomidine during exposure to isoflurane in utero during middle-pregnancy can attenuate the impairment of spatial learning and memory abilities for the rats in adulthood.
Authors: Camille E van Hoorn; Sanne E Hoeks; Heleen Essink; Dick Tibboel; Jurgen C de Graaff Journal: Paediatr Anaesth Date: 2019-01-15 Impact factor: 2.556