Kolyva, Christina and Ghosh, Arnab and Tachtsidis, Ilias and Highton, David and Cooper, Chris E and Smith, Martin and Elwell, Clare E (2014) Cytochrome c oxidase response to changes in cerebral oxygen delivery in the adult brain shows higher brain-specificity than haemoglobin. NeuroImage, 85 (Pt 1). pp. 234-244. DOI https://doi.org/10.1016/j.neuroimage.2013.05.070
Kolyva, Christina and Ghosh, Arnab and Tachtsidis, Ilias and Highton, David and Cooper, Chris E and Smith, Martin and Elwell, Clare E (2014) Cytochrome c oxidase response to changes in cerebral oxygen delivery in the adult brain shows higher brain-specificity than haemoglobin. NeuroImage, 85 (Pt 1). pp. 234-244. DOI https://doi.org/10.1016/j.neuroimage.2013.05.070
Kolyva, Christina and Ghosh, Arnab and Tachtsidis, Ilias and Highton, David and Cooper, Chris E and Smith, Martin and Elwell, Clare E (2014) Cytochrome c oxidase response to changes in cerebral oxygen delivery in the adult brain shows higher brain-specificity than haemoglobin. NeuroImage, 85 (Pt 1). pp. 234-244. DOI https://doi.org/10.1016/j.neuroimage.2013.05.070
Abstract
The redox state of cerebral mitochondrial cytochrome c oxidase monitored with near-infrared spectroscopy (δ[oxCCO]) is a signal with strong potential as a non-invasive, bedside biomarker of cerebral metabolic status. We hypothesised that the higher mitochondrial density of brain compared to skin and skull would lead to evidence of brain-specificity of the δ[oxCCO] signal when measured with a multi-distance near-infrared spectroscopy (NIRS) system. Measurements of δ[oxCCO] as well as of concentration changes in oxygenated (δ[HbO2]) and deoxygenated haemoglobin (δ[HHb]) were taken at multiple source-detector distances during systemic hypoxia and hypocapnia (decrease in cerebral oxygen delivery), and hyperoxia and hypercapnia (increase in cerebral oxygen delivery) from 15 adult healthy volunteers. Increasing source-detector spacing is associated with increasing light penetration depth and thus higher sensitivity to cerebral changes. An increase in δ[oxCCO] was observed during the challenges that increased cerebral oxygen delivery and the opposite was observed when cerebral oxygen delivery decreased. A consistent pattern of statistically significant increasing amplitude of the δ[oxCCO] response with increasing light penetration depth was observed in all four challenges, a behaviour that was distinctly different from that of the haemoglobin chromophores, which did not show this statistically significant depth gradient. This depth-dependence of the δ[oxCCO] signal corroborates the notion of higher concentrations of CCO being present in cerebral tissue compared to extracranial components and highlights the value of NIRS-derived δ[oxCCO] as a brain-specific signal of cerebral metabolism, superior in this aspect to haemoglobin. © 2013 Elsevier Inc.
Item Type: | Article |
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Uncontrolled Keywords: | Cytochrome c oxidase; Hypoxia; Hyperoxia; Hypocapnia; Hypercapnia; Near-infrared spectroscopy |
Subjects: | Q Science > QH Natural history > QH301 Biology |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 19 Sep 2014 10:31 |
Last Modified: | 07 Aug 2024 19:44 |
URI: | http://repository.essex.ac.uk/id/eprint/10189 |
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