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Title: Non-invasive assessment of cerebral oxygenation: A comparison of retinal and transcranial oximetry
Authors: Van Keer, Karel
Van Keer, Jan
Breda, Joao Barbosa
Nassiri, Vahid 
De Deyne, Cathy 
Genbrugge, Cornelia 
Pinto, Luis Abegao
Stalmans, Ingeborg
Vandewalle, Evelien
Issue Date: 2018
Source: PLOS ONE, 13(1) (Art N° e0190612)
Abstract: Background To investigate the correlation between cerebral (SO2-transcranial), retinal arterial (SaO(2-retinal)) and venous (SvO(2-retinal)) oxygen saturation as measured by near-infrared spectroscopy (NIRS) and retinal oximetry respectively. Methods Paired retinal and cerebral oxygen saturation measurements were performed in healthy volunteers. Arterial and venous retinal oxygen saturation and diameter were measured using a non-invasive spectrophotometric retinal oximeter. Cerebral oxygen saturation was measured using near-infrared spectroscopy. Correlations between SO2-transcranial and retinal oxygen saturation and diameter measurements were assessed using Pearson correlation coefficients. Lin's concordance correlation coefficient (CCC) and Bland-Altman analysis were performed to evaluate the agreement between SO2-transcranial as measured by NIRS and as estimated using a fixed arterial: venous ratio as 0.3 x SaO(2-retinal) + 0.7 x SvO(2-retinal). The individual relative weight of SaO(2-retinal) and SvO(2-retinal) to obtain the measured SO2-transcranial was calculated for all subjects. Results Twenty-one healthy individuals aged 26.4 +/- 2.2 years were analyzed. SO2-transcranial was positively correlated with both SaO(2-retinal) and SvO(2-retinal) (r = 0.44, p = 0.045 and r = 0.43, p = 0.049 respectively) and negatively correlated with retinal venous diameter (r = -0.51, p = 0.017). Estimated SO2-transcranial based on retinal oximetry showed a tolerance interval of (-13.70 to 14.72) and CCC of 0.46 (95% confidence interval: 0.05 to 0.73) with measured SO2-transcranial. The average relative weights of SaO(2-retinal) and SvO(2-retinal) to obtain SO2-transcranial were 0.31 +/- 0.11 and 0.69 +/- 0.11, respectively. Conclusion This is the first study to show the correlation between retinal and cerebral oxygen saturation, measured by NIRS and retinal oximetry. The average relative weight of arterial and venous retinal oxygen saturation to obtain the measured transcranial oxygen saturation as measured by NIRS, approximates the established arterial: venous ratio of 30:70 closely, but shows substantial inter-individual variation. These findings provide a proof of concept for the role of retinal oximetry in evaluating cerebral oxygenation.
Notes: [Van Keer, Karel; Breda, Joao Barbosa; Stalmans, Ingeborg; Vandewalle, Evelien] Univ Hosp Leuven, Dept Ophthalmol, Leuven, Belgium. [Van Keer, Jan] Univ Hosp Leuven, Dept Cardiol, Leuven, Belgium. [Nassiri, Vahid] Katholieke Univ Leuven, I BioStat, Leuven, Belgium. [De Deyne, Cathy; Genbrugge, Cornelia] Hasselt Univ, Fac Med & Life Sci, Hasselt, Belgium. [De Deyne, Cathy; Genbrugge, Cornelia] Ziekenhuis Oost Limburg, Dept Anesthesiol Intens Care Emergency Med & Pain, Genk, Belgium. [Pinto, Luis Abegao] Ctr Hosp Lisboa Norte, Dept Ophthalmol, Lisbon, Portugal. [Stalmans, Ingeborg] Katholieke Univ Leuven, Lab Ophthalmol, Dept Ophthalmol Neurosci, Leuven, Belgium.
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ISSN: 1932-6203
e-ISSN: 1932-6203
DOI: 10.1371/journal.pone.0190612
ISI #: 000419403800080
Rights: © 2018 Van Keer et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Category: A1
Type: Journal Contribution
Validations: ecoom 2019
Appears in Collections:Research publications

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