Document Detail


Time development models for perfusion provocations studied with laser-Doppler flowmetry, applied to iontophoresis and PORH.
MedLine Citation:
PMID:  19488922     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Frits F M de Mul; Judith Blaauw; Ries J Smit; Gerhard Rakhorst; Jan G Aarnoudse
Publication Detail:
Type:  Journal Article     Date:  2009-06-01
Journal Detail:
Title:  Microcirculation (New York, N.Y. : 1994)     Volume:  16     ISSN:  1549-8719     ISO Abbreviation:  Microcirculation     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2010-08-25     Completed Date:  2011-01-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9434935     Medline TA:  Microcirculation     Country:  United States    
Other Details:
Languages:  eng     Pagination:  559-71     Citation Subset:  IM    
Affiliation:
University of Groningen, Faculty of Medicine, Department of Biomedical Engineering BMSA, University Medical Center Groningen, Groningen, The Netherlands. ffm@demul.net
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MeSH Terms
Descriptor/Qualifier:
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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