| Time development models for perfusion provocations studied with laser-Doppler flowmetry, applied to iontophoresis and PORH. | |
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MedLine Citation:
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PMID: 19488922 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Clinical acceptance of laser-Doppler perfusion monitoring (LDPM) of microcirculation suffers from lack of quantitatively reliable signal data, due to varying tissue constitution, temperature, hydration, etc. In this article, we show that a novel approach using physiological models for response upon provocations provides quantitatively and clinically relevant time constants. METHODS: We investigated this for two provocation protocols: postocclusive reactive hyperemia (PORH) and iontophoresis shots, measured with LDPM on extremities. PORH experiments were performed on patients with peripheral arterial occlusive disease (PAOD) or diabetes mellitus (DM), and on healthy controls. Iontophoresis experiments were performed on pre-eclamptic patients and healthy controls. We developed two dynamical physical models, both based on two characteristic time constants: for PORH, an "arterial" and a "capillary" time constant and, for iontophoresis, a "diffusion" and a "decay" time constant. RESULTS: For the different subject groups, we could extract time constants that could probably be related to physiological differences. For iontophoresis, a shot saturation constant was determined, with very different values for different groups and administered drugs. CONCLUSIONS: With these models, the dynamics of the provocations can be investigated and quantitative comparisons between experiments and subject groups become available. The models offer a quantifiable standard that is independent of the type of LDPM instrumentation. |
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Authors:
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Frits F M de Mul; Judith Blaauw; Ries J Smit; Gerhard Rakhorst; Jan G Aarnoudse |
Publication Detail:
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Type: Journal Article Date: 2009-06-01 |
Journal Detail:
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Title: Microcirculation (New York, N.Y. : 1994) Volume: 16 ISSN: 1549-8719 ISO Abbreviation: Microcirculation Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2010-08-25 Completed Date: 2011-01-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9434935 Medline TA: Microcirculation Country: United States |
Other Details:
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Languages: eng Pagination: 559-71 Citation Subset: IM |
Affiliation:
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University of Groningen, Faculty of Medicine, Department of Biomedical Engineering BMSA, University Medical Center Groningen, Groningen, The Netherlands. ffm@demul.net |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Case-Control Studies Diabetes Mellitus / physiopathology Female Humans Hyperemia / physiopathology* Iontophoresis / methods* Laser-Doppler Flowmetry / methods*, standards Male Models, Theoretical* Perfusion / methods Peripheral Vascular Diseases / physiopathology Pre-Eclampsia / physiopathology Pregnancy Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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