Document Detail


Distributed model of peritoneal fluid absorption.
MedLine Citation:
PMID:  16714354     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The process of water reabsorption from the peritoneal cavity into the surrounding tissue substantially decreases the net ultrafiltration in patients on peritoneal dialysis. The goal of this study was to propose a mathematical model based on data from clinical studies and animal experiments to describe the changes in absorption rate, interstitial hydrostatic pressure, and tissue hydration caused by increased intraperitoneal pressure after the initiation of peritoneal dialysis. The model describes water transport through a deformable, porous tissue after infusion of isotonic solution into the peritoneal cavity. Blood capillary and lymphatic vessels are assumed to be uniformly distributed within the tissue. Starling's law is applied for a description of fluid transport through the capillary wall, and the transport within the interstitium is modeled by Darcy's law. Transport parameters such as interstitial fluid volume ratio, tissue hydraulic conductance, and lymphatic absorption in the tissue are dependent on local interstitial pressure. Numerical simulations show the strong dependence of fluid absorption and tissue hydration on the values of intraperitoneal pressure. Our results predict that in the steady state only approximately 20-40% of the fluid that flows into the tissue from the peritoneal cavity is absorbed by the lymphatics situated in the tissue, whereas the larger (60-80%) part of the fluid is absorbed by the blood capillaries.
Authors:
J Stachowska-Pietka; J Waniewski; M F Flessner; B Lindholm
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Publication Detail:
Type:  Journal Article     Date:  2006-05-19
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  291     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-09-15     Completed Date:  2006-11-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H1862-74     Citation Subset:  IM    
Affiliation:
Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, ul. Trojdena 4, 02-109 Warsaw, Poland.
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MeSH Terms
Descriptor/Qualifier:
Absorption / physiology
Animals
Ascitic Fluid / metabolism*
Capillaries / physiology
Computer Simulation*
Extracellular Fluid / metabolism
Humans
Hydrostatic Pressure
Lymphatic System / physiology
Models, Theoretical*
Peritoneal Cavity / physiology
Peritoneal Dialysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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