{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T05:35:34Z","timestamp":1789623334818,"version":"build-2803163510"},"reference-count":102,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2021,1,18]],"date-time":"2021-01-18T00:00:00Z","timestamp":1610928000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001804","name":"Canada Research Chairs","doi-asserted-by":"publisher","award":["F11\u201002423"],"award-info":[{"award-number":["F11\u201002423"]}],"id":[{"id":"10.13039\/501100001804","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000377","name":"Dunhill Medical Trust","doi-asserted-by":"publisher","award":["RTF97\/0117"],"award-info":[{"award-number":["RTF97\/0117"]}],"id":[{"id":"10.13039\/501100000377","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["physoc.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2021,3]]},"abstract":"<jats:sec><jats:title>Key points<\/jats:title><jats:p><jats:list list-type=\"bullet\">\n<jats:list-item><jats:p>We investigated the influence of arterial <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0002.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0002\"\/> (<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0003.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0003\"\/>) with and without acutely elevated arterial pH and bicarbonate ([HCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>]) on cerebral blood flow (CBF) regulation in the internal carotid artery and vertebral artery.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>We assessed stepwise iso\u2010oxic alterations in <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0004.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0004\"\/> (i.e. cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity) prior to and following <jats:sc>i.v.<\/jats:sc> sodium bicarbonate infusion (NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>) to acutely elevate arterial pH and [HCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>].<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Total CBF was unchanged irrespective of a higher arterial pH at each matched stage of <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0005.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0005\"\/>, indicating that CBF is acutely regulated by <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0006.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0006\"\/> rather than arterial pH.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The cerebrovascular responses to changes in arterial H<jats:sup>+<\/jats:sup>\/pH were altered in keeping with the altered relationship between <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0007.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0007\"\/> and H<jats:sup>+<\/jats:sup>\/pH following NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup> infusion (i.e. changes in buffering capacity).<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Total CBF was \u223c7% higher following NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup> infusion during isocapnic breathing providing initial evidence for a direct vasodilatory influence of HCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup> independent of <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0008.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0008\"\/> levels.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><\/jats:sec><jats:sec><jats:title>Abstract<\/jats:title><jats:p>Cerebral blood flow (CBF) regulation is dependent on the integrative relationship between arterial <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0009.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0009\"\/> (<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0010.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0010\"\/>), pH and cerebrovascular tone; however, pre\u2010clinical studies indicate that intrinsic sensitivity to pH, independent of changes in <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0011.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0011\"\/> or intravascular bicarbonate ([HCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>]), principally influences cerebrovascular tone. Eleven healthy males completed a standardized cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity (CVR) test utilizing radial artery catheterization and Duplex ultrasound (CBF); consisting of matched stepwise iso\u2010oxic alterations in <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0012.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0012\"\/> (hypocapnia: \u20135, \u201310\u00a0mmHg; hypercapnia: +5, +10 mmHg) prior to and following <jats:sc>i.v.<\/jats:sc> sodium bicarbonate (NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>; 8.4%, 50 mEq\u00a050\u00a0mL<jats:sup>\u20131<\/jats:sup>) to elevate pH (7.408\u00a0\u00b1\u00a00.020 <jats:italic>vs<\/jats:italic>. 7.461\u00a0\u00b1\u00a00.030; <jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.001) and [HCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>] (26.1\u00a0\u00b1\u00a01.4 <jats:italic>vs<\/jats:italic>. 29.3\u00a0\u00b1\u00a00.9 mEq\u00a0L<jats:sup>\u20131<\/jats:sup>; <jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.001). Absolute CBF was not different at each stage of CO<jats:sub>2<\/jats:sub> reactivity (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.629) following NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>, irrespective of a higher pH (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.001) at each matched stage of <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0013.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0013\"\/> (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.927). Neither hypocapnic (3.44\u00a0\u00b1\u00a00.92 <jats:italic>vs<\/jats:italic>. 3.44\u00a0\u00b1\u00a01.05% per\u00a0mmHg <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0014.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0014\"\/>; <jats:italic>P<\/jats:italic>\u00a0=\u00a00.499), nor hypercapnic (7.45\u00a0\u00b1\u00a01.85 <jats:italic>vs<\/jats:italic>. 6.37\u00a0\u00b1\u00a02.23% per\u00a0mmHg <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0015.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0015\"\/>; <jats:italic>P<\/jats:italic>\u00a0=\u00a00.151) reactivity to <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0016.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0016\"\/> were altered pre\u2010 to post\u2010NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>. When indexed against arterial [H<jats:sup>+<\/jats:sup>], the relative hypocapnic CVR was higher (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.019) and hypercapnic CVR was lower (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.025) following NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>, respectively. These changes in reactivity to [H<jats:sup>+<\/jats:sup>] were, however, explained by alterations in buffering between <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0017.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0017\"\/> and arterial H<jats:sup>+<\/jats:sup>\/pH consequent to NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup>. Lastly, CBF was higher (688\u00a0\u00b1\u00a0105 <jats:italic>vs<\/jats:italic>. 732\u00a0\u00b1\u00a089 mL\u00a0min<jats:sup>\u20131<\/jats:sup>, 7%\u00a0\u00b1\u00a012%; <jats:italic>P<\/jats:italic>\u00a0=\u00a00.047) following NaHCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup> during isocapnic breathing providing support for a direct influence of HCO<jats:sub>3<\/jats:sub><jats:sup>\u2013<\/jats:sup> on cerebrovascular tone independent of <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0018.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0018\"\/>. These data indicate that in the setting of acute metabolic alkalosis, CBF is regulated by <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tjp14517-math-0019.png\" xlink:title=\"urn:x-wiley:00223751:media:tjp14517:tjp14517-math-0019\"\/> rather than arterial pH.<\/jats:p><\/jats:sec>","DOI":"10.1113\/jp280682","type":"journal-article","created":{"date-parts":[[2021,1,7]],"date-time":"2021-01-07T16:06:55Z","timestamp":1610035615000},"page":"1439-1457","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Arterial carbon dioxide and bicarbonate rather than pH regulate cerebral blood flow in the setting of acute experimental metabolic alkalosis"],"prefix":"10.1113","volume":"599","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6072-7277","authenticated-orcid":false,"given":"Hannah G.","family":"Caldwell","sequence":"first","affiliation":[{"name":"Centre for Heart, Lung and Vascular Health School of Health and Exercise Sciences University of British Columbia Okanagan  Kelowna BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1133-2444","authenticated-orcid":false,"given":"Connor A.","family":"Howe","sequence":"additional","affiliation":[{"name":"Centre for Heart, Lung and Vascular Health School of Health and Exercise Sciences University of British Columbia Okanagan  Kelowna BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4624-4003","authenticated-orcid":false,"given":"Carter J.","family":"Chalifoux","sequence":"additional","affiliation":[{"name":"Centre for Heart, Lung and Vascular Health School of Health and Exercise Sciences University of British Columbia Okanagan  Kelowna BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5657-0059","authenticated-orcid":false,"given":"Ryan L.","family":"Hoiland","sequence":"additional","affiliation":[{"name":"Department of Anesthesiology Pharmacology and Therapeutics Vancouver General Hospital University of British Columbia  Vancouver BC Canada"},{"name":"Department of Cellular and Physiological Sciences University of British Columbia  Vancouver BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7236-1348","authenticated-orcid":false,"given":"Jay M. J. R.","family":"Carr","sequence":"additional","affiliation":[{"name":"Centre for Heart, Lung and Vascular Health School of Health and Exercise Sciences University of British Columbia Okanagan  Kelowna BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8204-1513","authenticated-orcid":false,"given":"Courtney V.","family":"Brown","sequence":"additional","affiliation":[{"name":"Centre for Heart, Lung and Vascular Health School of Health and Exercise Sciences University of British Columbia Okanagan  Kelowna BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2634-6195","authenticated-orcid":false,"given":"Alexander","family":"Patrician","sequence":"additional","affiliation":[{"name":"Centre for Heart, Lung and Vascular Health School of Health and Exercise Sciences University of British Columbia Okanagan  Kelowna BC 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