| Characterization of volumetric flow rate waveforms at the carotid bifurcations of older adults. | |
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MedLine Citation:
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PMID: 20086276 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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While it is widely appreciated that volumetric blood flow rate (VFR) dynamics change with age, there has been no detailed characterization of the typical shape of carotid bifurcation VFR waveforms of older adults. Toward this end, retrospectively gated phase contrast magnetic resonance imaging was used to measure time-resolved VFR waveforms proximal and distal to the carotid bifurcations of 94 older adults (age 68 +/- 8 years) with little or no carotid artery disease, recruited from the BLSA cohort of the VALIDATE study of factors in vascular aging. Timings and amplitudes of well-defined feature points from these waveforms were extracted automatically and averaged to produce representative common, internal and external carotid artery (CCA, ICA and ECA) waveform shapes. Relative to young adults, waveforms from older adults were found to exhibit a significantly augmented secondary peak during late systole, resulting in significantly higher resistance index (RI) and flow augmentation index (FAI). Cycle-averaged VFR at the CCA, ICA and ECA were 389 +/- 74, 245 +/- 61 and 125 +/- 49 mL min(-1), respectively, reflecting a significant cycle-averaged outflow deficit of 5%, which peaked at around 10% during systole. A small but significant mean delay of 13 ms between arrivals of ICA versus CCA/ECA peak VFR suggested differential compliance of these vessels. Sex and age differences in waveform shape were also noted. The characteristic waveforms presented here may serve as a convenient baseline for studies of VFR waveform dynamics or as suitable boundary conditions for models of blood flow in the carotid arteries of older adults. |
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Authors:
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Yiemeng Hoi; Bruce A Wasserman; Yuanyuan J Xie; Samer S Najjar; Luigi Ferruci; Edward G Lakatta; Gary Gerstenblith; David A Steinman |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, N.I.H., Intramural; Research Support, Non-U.S. Gov't Date: 2010-01-20 |
Journal Detail:
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Title: Physiological measurement Volume: 31 ISSN: 1361-6579 ISO Abbreviation: Physiol Meas Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-23 Completed Date: 2010-05-13 Revised Date: 2011-07-25 |
Medline Journal Info:
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Nlm Unique ID: 9306921 Medline TA: Physiol Meas Country: England |
Other Details:
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Languages: eng Pagination: 291-302 Citation Subset: IM |
Affiliation:
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Department of Mechanical & Industrial Engineering, Biomedical Simulation Laboratory, University of Toronto, Toronto, Ontario, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Age Factors Aged Automation Blood Volume* Carotid Arteries / physiology* Carotid Artery, Common / physiology Carotid Artery, External / physiology Carotid Artery, Internal / physiology Cohort Studies Female Humans Longitudinal Studies Magnetic Resonance Imaging / methods* Male Middle Aged Regional Blood Flow* Retrospective Studies Sex Factors Signal Processing, Computer-Assisted* Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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MOP-62934//Canadian Institutes of Health Research; N01-AG-3-1003/AG/NIA NIH HHS; Z01 AG000244-01/AG/NIA NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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