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Visual recognition memory is impaired in rhesus monkeys repeatedly exposed to sevoflurane in infancy

Lookup NU author(s): Dr Kathy Murphy


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© 2017 The Author. Background. Experimental studies in animals have shown that exposure to general anaesthesia in infancy can cause loss of cells in the central nervous system and long-term impairments in neurocognitive function. Some human epidemiological studies have shown increased risk of learning disability after repeated anaesthesia exposure in early childhood. Thus, we investigated in a highly translational rhesus monkey model, whether repeated exposure in infancy to the inhalation anaesthetic sevoflurane is associated with impaired visual recognition memory during the first two yr of life. Methods. Rhesus monkeys of both sexes were exposed to sevoflurane inhalation anaesthesia on approximately postnatal day 7 and then again 14 and 28 days later, for four h each time. Visual recognition memory was tested using the visual paired comparison task, which measures memory by assessing preference for looking at a new image over a previously-viewed image. Monkeys were tested at 6-10 months of age, again at 12-18 months of age, and again at 24-30 months of age. Results. No memory impairment was detected at 6-10 months old, but significant impairment (reduced time looking at the novel image) was observed at 12-18 and 24-30 months old. Conclusions. Repeated exposure of infant rhesus monkeys to sevoflurane results in visual recognition memory impairment that emerges after the first yr of life. This is consistent with epidemiological studies that show increased risk of learning disability after repeated exposure to anaesthesia in infancy/early childhood. Moreover, these deficits may emerge at later developmental stages, even when memory performance is unaffected earlier in development.

Publication metadata

Author(s): Alvarado MC, Murphy KL, Baxter MG

Publication type: Article

Publication status: Published

Journal: British Journal of Anaesthesia

Year: 2017

Volume: 119

Issue: 3

Pages: 517-523

Print publication date: 01/09/2017

Online publication date: 31/05/2017

Acceptance date: 20/12/2016

ISSN (print): 0007-0912

ISSN (electronic): 1471-6771

Publisher: Oxford University Press


DOI: 10.1093/bja/aew473


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Funder referenceFunder name
National Institutes of Health (NIH)/National Institute of Child Health and Development (grant R01-HD068388)