Bilateral regional extracranial blood flow regulation to hypoxia and unilateral duplex ultrasound measurement error

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Friend, A. T., Rogan, M., Rossetti, G. M. K. ORCID: https://orcid.org/0000-0002-9610-6066, Lawley, J. S., Mullins, P. G., Sandoo, A., Macdonald, J. H. and Oliver, S. J. (2021) Bilateral regional extracranial blood flow regulation to hypoxia and unilateral duplex ultrasound measurement error. Experimental Physiology. ISSN 1469-445X

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To link to this item DOI: 10.1113/EP089196

Abstract/Summary

Whether blood flow regulation to hypoxia is similar between left and right internal carotid arteries (ICA) and vertebral arteries (VA) is unclear. Extracranial blood flow is regularly calculated by doubling a unilateral assessment; however, lateral artery differences may lead to measurement error. This study aimed to determine extracranial blood flow regulation to hypoxia when factoring for vessel type (ICA or VA) and vessel side (left or right) effects, and investigate unilateral assessment measurement error compared to bilateral assessment. In a repeated-measures crossover design, extracranial arteries of 44 participants were assessed bilaterally by Duplex ultrasound during 90 minutes of normoxic and poikilocapnic hypoxic (12.0% fraction of inspired oxygen) conditions. Linear mixed model analyses revealed no ‘Condition’ × ‘Vessel Type’ × ‘Vessel Side’ interaction for blood flow, vessel diameter, and flow velocity (all P > 0.05) indicating left and right ICA and VA blood flow regulation to hypoxia was similar. Bilateral hypoxic reactivity was comparable [ICA, 1.4 (1.0) vs VA, 1.7 (1.1) Δ%·ΔSpO2-1; P = 0.12]. Compared to bilateral assessment, unilateral mean measurement error of the relative blood flow response to hypoxia was up to 5%, but individual errors reached 37% and were greatest in ICA and VA with the smaller resting blood flow due to a ratio-scaling problem. In conclusion, left and right ICA and VA regulation to hypoxia is comparable when factoring for vessel type and vessel side. Assessing the ICA and VA vessels with the larger resting blood flow, not the left or right vessel, reduces unilateral measurement error.

Item Type:	Article
Refereed:	Yes
Divisions:	Interdisciplinary Research Centres (IDRCs) > Centre for Integrative Neuroscience and Neurodynamics (CINN) Life Sciences > School of Psychology and Clinical Language Sciences > Department of Psychology Life Sciences > School of Psychology and Clinical Language Sciences > Neuroscience
ID Code:	97683
Publisher:	Wiley

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References

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Bilateral regional extracranial blood flow regulation to hypoxia and unilateral duplex ultrasound measurement error

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