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pubmed-article:1464354pubmed:abstractTextThe purpose of this study was to describe the function of platelets throughout their life span by expressing their in vivo distribution and kinetic behaviour in mathematical terms by using multicompartmental analysis. The distribution of indium-111 labelled platelets in five normal subjects was imaged and quantified with a scintillation camera image processing system. Serial blood samples were also obtained. The data were modelled using the SAAM (Simulation Analysis and Modelling) compartmental computer program. Five models were entertained to evaluate the role of platelets that were either functional or injured during collection and their interaction with the liver, spleen and vascular endothelium. Models were evaluated by comparing F values calculated from the least squares estimate obtained from each model. The Dornhorst function was used to describe the sequestration of platelets in the compartmental model. Results indicated that the data could not be satisfactorily simulated when compartments were included that simulated only functional and sequestered platelets (model 1). It was necessary to include compartments that simulated the kinetics of collection-injured platelets in the liver (model 2) and spleen (model 3). The model that simulated the interaction with the vascular endothelium (model 5) showed a visual but not significant improvement in the fitting of the observed data compared to model 3. The mean organ uptake and range indicated in parentheses were calculated at equilibrium. There were 20% (15%-27%) of the injected platelets in the spleen, 10% (8%-11%) in the liver and 70% (64%-75%) in the circulation.(ABSTRACT TRUNCATED AT 250 WORDS)lld:pubmed
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pubmed-article:1464354pubmed:authorpubmed-author:HeynsA DADlld:pubmed
pubmed-article:1464354pubmed:authorpubmed-author:LötterM GMGlld:pubmed
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pubmed-article:1464354pubmed:authorpubmed-author:KotzéH FHFlld:pubmed
pubmed-article:1464354pubmed:authorpubmed-author:RoodtJ PJPlld:pubmed
pubmed-article:1464354pubmed:authorpubmed-author:SweetloveM...lld:pubmed
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pubmed-article:1464354pubmed:volume19lld:pubmed
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pubmed-article:1464354pubmed:pagination1023-31lld:pubmed
pubmed-article:1464354pubmed:dateRevised2004-11-17lld:pubmed
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pubmed-article:1464354pubmed:year1992lld:pubmed
pubmed-article:1464354pubmed:articleTitleBlood platelet kinetics in normal subjects modelled by compartmental analysis.lld:pubmed
pubmed-article:1464354pubmed:affiliationDepartment of Biophysics (G68), University of the Orange Free State, Bloemfontein, South Africa.lld:pubmed
pubmed-article:1464354pubmed:publicationTypeJournal Articlelld:pubmed