Abstract
Purpose
A better understanding of the complex pathophysiology of traumatic brain injury (TBI) is needed to improve our current therapies. Cerebral microdialysis (CMD) is an advanced method to monitor the brain, but little is known about its parameters in children. Brain glycerol, one of the CMD variables, is an essential component of the phospholipid bilayer cell membrane and is considered a useful marker of tissue hypoxia in adults. This study examined the time course of glycerol and its associations in paediatric TBI.
Methods
In this retrospective cohort study, we collected data on children (< 13years) with severe TBI who underwent CMD monitoring. The relationship of glycerol was examined with respect to physiological, radiological variables, and clinical outcome.
Results
Twenty-eight children underwent CMD monitoring and had evaluable data. Lesion progression on head computed tomography (CT) demonstrated a strong relationship with glycerol (median glycerol, maximum and initial-to-maximum) when lesion size increased by > 30% (p=0.01, p=0.04 and p=0.004). Absolute glycerol values had a weak but statistically significant association with intracranial pressure and brain oxygenation. We did not find an association with clinical outcome.
Conclusion
This is the first study to provide data on brain interstitial glycerol in children. CMD glycerol, particularly an increase from baseline, is associated with other markers of injury and with a significant increase in lesion size on repeat head CT. As such, it may represent a useful monitorable marker for evolving injury in paediatric TBI.
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Acknowledgements
The authors would like to thank Prof Peter Siesjo and Dr David Cederberg from Lund University for their valuable assistance in the initial setup of microdialysis monitoring at our institution. Their help was greatly appreciated.
Funding
Dr Thango received a bursary from the National Research Foundation. Anthony Figaji is supported by the NRF SARChI Chair of Clinical Neurosciences. We gratefully acknowledge the effort of the neurosurgical residents in contributing to the success of the project.
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Thango, N.S., Rohlwink, U.K., Dlamini, L. et al. Brain interstitial glycerol correlates with evolving brain injury in paediatric traumatic brain injury. Childs Nerv Syst 37, 1713–1721 (2021). https://doi.org/10.1007/s00381-021-05058-2
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DOI: https://doi.org/10.1007/s00381-021-05058-2