Journal
BRITISH JOURNAL OF ANAESTHESIA
Volume 119, Issue 3, Pages 524-531Publisher
OXFORD UNIV PRESS
DOI: 10.1093/bja/aex123
Keywords
anaesthesia; apoptosis; growth and development; isoflurane
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Funding
- US National Institute of Child Health and Human Development [R01-HD052664, R01-HD052664S, U54-HD087011]
- Intellectual and Developmental Disabilities Research Center at Washington University)
- Office of the Director, US National Institutes of Health [P51-OD011092]
- Oregon National Primate Research Center
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Background: Retrospective clinical studies suggest there is a risk for neurodevelopmental impairment following early childhood exposure to anaesthesia. In the developing animal brain, including those of non-human primates (NHPs), anaesthetics induce apoptotic cell death. We previously reported that a 5h isoflurane (ISO) exposure in infant NHPs increases apoptosis 13-fold compared with control animals. However, the majority of paediatric surgeries requiring anaesthesia are of shorter durations. We examined whether 3 h ISO exposure similarly increases neuroapoptosis in the NHP developing brain. Methods: Six-day-old NHP infants (Macaca mulatta) were exposed to 3h of a surgical plane of ISO (n = 6) or to room air (n = 5). Following exposure, NHP brains were screened for neuronal and oligodendrocyte apoptosis using activated caspase-3 immunolabelling and unbiased stereology. Results: ISO treatment increased apoptosis (neurones + oligodendrocyte) to greater than four times that in the control group [mean density of apoptotic profiles: 57 (SD 22) mm(-3) vs 14 (SD 5.2) mm(-3), respectively]. Oligodendrocyte apoptosis was evenly distributed throughout the white matter whereas neuroapoptosis occurred primarily in the cortex (all regions), caudate, putamen and thalamus. Conclusions: A 3 h exposure to ISO is sufficient to induce widespread neurotoxicity in the developing primate brain. These results are relevant for clinical medicine, as many surgical and diagnostic procedures in children require anaesthesia durations similar to those modelled here. Further research is necessary to identify long-termneurobehavioural consequences of 3h ISO exposure.
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