Key result
Multi-distance hyperspectral near-infrared spectroscopy detected significant cerebral responses to 30-second breath-holds in cytochrome C oxidase redox at 4 cm and in hemodynamics at 3 cm.
Why the study?
Near-infrared spectroscopy has high sensitivity to the scalp and low sensitivity to the adult human brain, limiting its ability to separate cerebral from superficial tissue responses.
What are the optimal parameters for multi-distance hyperspectral NIRS to detect cerebral responses to breath-holding in healthy adults?
Observational (n=12)
No
What are the optimal parameters for multi-distance hyperspectral NIRS to detect cerebral responses to breath-holding in healthy adults?
Multi-distance hyperspectral NIRS in the 700-900 nm waveband can successfully separate cerebral from superficial hemodynamic responses during breath-holding in adults.
Answers are grounded in this paper and cite their sources.
hNIRS optimization may enhance cerebral signal isolation in adults; leaves open clinical validation for brain monitoring applications.
A major limitation of near-infrared spectroscopy (NIRS) is its high sensitivity to the scalp and low sensitivity to the brain of adult humans. In the present work we used multi-distance hyperspectral NIRS (hNIRS) to investigate the optimal source-detector distances, wavelength ranges, and analysis techniques to separate cerebral responses to 30 s breath-holds (BHs) from the responses in the superficial tissue layer in healthy adult humans. We observed significant responses to BHs in the scalp hemodynamics. Cerebral responses to BHs were detected in the cytochrome C oxidase redox (rCCO) at 4 cm without using data from the short-distance channel. Using the data from the 1 cm channel in the two-layer regression algorithm showed that cerebral hemodynamic and rCCO responses also occurred at 3 cm. We found that the waveband 700–900 nm was optimal for the detection of cerebral responses to BHs in adults.
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Guerouah et al. (2021) conducted an observational in Healthy (n=12). 30-second breath-holding vs. Baseline rest was evaluated on Cerebral responses in cytochrome C oxidase redox (rCCO) and hemodynamics. Multi-distance hyperspectral near-infrared spectroscopy detected significant cerebral responses to 30-second breath-holds in cytochrome C oxidase redox at 4 cm and in hemodynamics at 3 cm.
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