ArticleJournal of medical ultrasound
Carotid Blood Flow Assessment during Dynamic Respiratory Maneuvers Demonstrates a Shift toward Vasoconstriction with Increasing Age.
Article in Journal of medical ultrasound. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Authors and funding
5 authors.
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Abstract
Background: Internal carotid artery (ICA) blood flow may be an alternative target to measure cerebrovascular reactivity (CVR) and endothelium-dependent vasodilatory dysfunction. We investigated the feasibility of testing CVR in the ICA during routine clinical carotid investigation. Methods: CVR was assessed by effects of breath-hold (BH) and rapid-breathing (RB) on ICA diameter, blood velocities (peak systolic velocity [PSV], end diastolic velocity [EDV], and mean velocity [MV]), volume flow, and relative to changes in end-tidal carbon dioxide (end-tidal CO Results: In 50 patients (68 ± 13 years old, 15 female), recordings during rest, BH, and RB were of good quality in 96%, 90%, and 88%, respectively. Age-related reductions in blood velocities were evident during rest (EDV: Conclusion: During routine carotid duplex assessment, assessing CVR in the ICA was feasible, practical, and associated with high quality recordings. Differential associations with age between hypercapnic and hypocapnic stimuli imply a greater tendency to vasoconstriction in older patients.
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