Rheology of the microcirculation

A. R. Pries, Timothy W Secomb

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

The main function of the microvasculature is the controlled exchange of materials with surrounding tissues. This necessitates a large vessel surface established by a high number of vessels with small diameters and thus an inherently high individual resistance to flow. The hydrodynamic resistance of a microvascular network with given angioarchitecture depends on the apparent viscosity of blood flowing in the microvessels. Apparent viscosity declines with decreasing diameter (the Fahraeus-Lindqvist effect) and is minimal at diameters of about 5-7 μ due to the optimal alignment of red cells with the flow. In vivo, a number of additional phenomena influence blood rheology and network hemodynamics. The distribution of blood flow and red cell flux within networks is influenced by the mechanics of red cell motion at individual diverging bifurcations (phase-separation effect). Furthermore, recent studies have revealed the presence of a thick endothelial surface layer (∼0.5 μm) on the luminal surface of microvessels which is attached to the endothelial glycocalyx. This layer modulates flow resistance and may be relevant for a number of other processes such as inflammatory responses and blood coagulation. Information on microvascular rheology can be used to develop mathematical models of network hemodynamics and vascular adaptation to the local environment (angioadaptation), to investigate the complex interrelated mechanisms which establish and maintain functionally adequate microvascular networks.

Original languageEnglish (US)
Pages (from-to)143-148
Number of pages6
JournalClinical Hemorheology and Microcirculation
Volume29
Issue number3-4
StatePublished - 2003

Fingerprint

Rheology
Microcirculation
Microvessels
Hemodynamics
Glycocalyx
Blood Viscosity
Blood Coagulation
Hydrodynamics
Mechanics
Viscosity
Blood Vessels
Theoretical Models
Erythrocytes

Keywords

  • Angioadaptation
  • Blood flow
  • Endothelial surface layer
  • Microvascular networks
  • Model simulation

ASJC Scopus subject areas

  • Hematology
  • Physiology

Cite this

Rheology of the microcirculation. / Pries, A. R.; Secomb, Timothy W.

In: Clinical Hemorheology and Microcirculation, Vol. 29, No. 3-4, 2003, p. 143-148.

Research output: Contribution to journalArticle

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