| Flow-induced changes in pial artery compliance registered with a non-invasive method in rabbits. | |
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MedLine Citation:
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PMID: 21658393 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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AIM: This study was performed: 1) to assess the relationship between blood flow velocity in the internal carotid artery (CBF(ICA)) and pial artery pulsation (cc-TQ) and 2) to evaluate flow-induced changes in pial artery compliance. METHODS: Experiments were performed on 10 crossbred male rabbits. Heart rate (HR), blood pressure (BP), left ventricle ejection fraction (LVEF), CBF(ICA), the systolic-diastolic blood volume fraction in the brain circulation (CBF(SDF)) and cc-TQ were recorded after glucagon and acetazolamide administration. cc-TQ was measured with near-infrared transillumination back scattering sounding (NIR-T/BSS), LVEF and CBF(SDF) with gated scintigraphy and BP and CBF(ICA) with electromagnetic pressure and flow transducers, respectively. Doses of drugs were chosen to exert a haemodynamic effect but not change BP or intracranial pressure. RESULTS: Acetazolamide and glucagon evoked significant increases in cc-TQ, CBF(SDF), CBF(ICA), LVEF and HR. The following interdependencies were found: 1) changes after acetazolamide administration compared to baseline: CBF(SDF) vs. LVEF (r=0.73, p<0.05), cc-TQ vs. CBF(SDF) (r=-0.67, p<0.05), cc-TQ vs. LVEF (r=-0.76, p<0.05), 2) changes after glucagon administration compared to baseline: CBF(ICA) vs. BP (r=0.73, p<0.05), CBF(SDF) vs. LVEF (r=0.87, p<0.05), cc-TQ vs. HR (r=0.85, p<0.05), cc-TQ vs. CBF(ICA) (r=-0.74, p<0.05). CONCLUSION: In the absence of systemic BP changes, pial arteries are significantly affected by changes in CBF(ICA). Pial arteries counteract changes in CBF(ICA) and CBF(SDF). The ability of pial arteries to stabilise CBF(ICA) is impaired after acetazolamide administration. Changes in cardiac output directly affect the brain's microcirculation. NIR-T/BSS recordings allow for non-invasive assessment of changes in pial artery compliance. |
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Authors:
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Andrzej F Frydrychowski; Magdalena Wszedybyl-Winklewska; Tomasz Bandurski; Pawel J Winklewski |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-31 |
Journal Detail:
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Title: Microvascular research Volume: - ISSN: 1095-9319 ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-6-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0165035 Medline TA: Microvasc Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
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Institute of Human Physiology, Faculty of Health Sciences, Medical University of Gdansk, Tuwima Str. 15, 80-210 Gdansk, Poland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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