Assessing changes in regional cerebral hemodynamics in adults with a high-density full-head coverage time-resolved near-infrared spectroscopy device

Kamar, Farah; Shoemaker, Leena N.; Eskandari, Rasa; Milej, Daniel; Drosdowech, Darren; Murkin, John M.; St. Lawrence, Keith; Chui, Jason; Diop, Mamadou

doi:10.1117/1.jbo.29.s3.s33302

J. Biomed. Opt.

2024

DOI: 10.1117/1.jbo.29.s3.s33302

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Assessing changes in regional cerebral hemodynamics in adults with a high-density full-head coverage time-resolved near-infrared spectroscopy device

Farah Kamar,

Leena N. Shoemaker,

Rasa Eskandari

et al.

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In vivo optical assessment of cerebral and skeletal muscle microvascular response to phenylephrine

Mawdsley,

Eskandari,

Kamar

et al. 2024

FASEB BioAdvances

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This study aimed to investigate the simultaneous response of the cerebral and skeletal muscle microvasculature to the same phenylephrine (PE) boluses. A hybrid optical system that combines hyperspectral near‐infrared spectroscopy (hs‐NIRS) and diffuse correlation spectroscopy (DCS) was used to monitor changes in tissue oxygenation and perfusion. Data were collected from the head and hind limb of seven male Sprague–Dawley rats while administering intravenous (IV) injections of PE or saline to all animals. The response to saline was used as a control. Skeletal muscle oxygenation decreased significantly after PE injection, while a statistically underpowered decrease in perfusion was observed, followed by an increase beyond baseline. Vascular conductance also decreased in the muscle reflecting the drug's vasoconstrictive effects. Tissue oxygenation and perfusion increased in the brain in response to PE. Initially, there was a sharp increase in cerebral perfusion but no changes in cerebral vascular conductance. Subsequently, cerebral flow and vascular conductance decreased significantly below baseline, likely reflecting autoregulatory mechanisms to manage the excess flow. Further, fitting an exponential function to the secondary decrease in cerebral perfusion and increase in muscular blood flow revealed a quicker kinetic response in the brain to adjust blood flow. In the skeletal muscle, PE caused a transient decrease in blood volume due to vasoconstriction, which resulted in an overall decrease in hemoglobin content and tissue oxygen saturation. Since PE does not directly affect cerebral vessels, this peripheral vasoconstriction shunted blood into the brain, resulting in an initial increase in oxygenated hemoglobin and oxygen saturation.

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In vivo optical assessment of cerebral and skeletal muscle microvascular response to phenylephrine

Mawdsley,

Eskandari,

Kamar

et al. 2024

FASEB BioAdvances

View full text Add to dashboard Cite

show abstract

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Assessing changes in regional cerebral hemodynamics in adults with a high-density full-head coverage time-resolved near-infrared spectroscopy device

Cited by 1 publication

References 42 publications

In vivo optical assessment of cerebral and skeletal muscle microvascular response to phenylephrine

In vivo optical assessment of cerebral and skeletal muscle microvascular response to phenylephrine

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