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A two-fluid model for hematocrit distribution in microvascular networks.

J E Hokkanen1

  • 1Department of Theoretical Physics, University of Helsinki, Finland.

Medical Physics
|May 1, 1989
PubMed
Summary

A new network model reveals plasma skimming effects on blood hematocrit. Contrary to prior beliefs, hematocrit remains stable in capillaries, influenced by network structure and symmetry.

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Area of Science:

  • Physiology
  • Biophysics
  • Computational Biology

Background:

  • Understanding blood flow dynamics is crucial for microcirculation.
  • Plasma skimming at vessel bifurcations influences hematocrit distribution.
  • Previous models had limitations in predicting discharge hematocrit accurately.

Purpose of the Study:

  • To introduce a novel theoretical network model for evaluating discharge hematocrits.
  • To investigate the role of plasma skimming in hematocrit distribution within a simulated microvasculature.
  • To analyze the impact of network structure on hematocrit values.

Main Methods:

  • Developed a two-fluid network model approximating blood as a red cell core and plasma layer.
  • Simulated bat wing microvasculature geometry.
  • Solved nonlinear hydrodynamic equations iteratively using computational methods.
  • Calculated discharge hematocrit distributions for five vessel generations.

Main Results:

  • Plasma skimming was correlated with hematocrit value dispersion.
  • Mean hematocrit did not decrease towards capillaries, challenging previous hypotheses.
  • Network structure significantly affected hematocrit distributions.
  • Mean discharge hematocrit remained stable despite variations in vessel dimensions and parameters.

Conclusions:

  • The model highlights the critical role of plasma skimming and network symmetry in maintaining stable mean discharge hematocrit.
  • Enhanced network asymmetry was found to lower hematocrit.
  • The findings provide new insights into hematocrit regulation in microvascular networks.

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