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Related Experiment Videos

Mechanical factors affecting hemostasis and thrombosis

V T Turitto1, C L Hall

  • 1Biomedical Engineering Department, Herff College of Engineering, The University of Memphis, Tennessee 38152, USA. vturitto@mocha.memphis.edu

Thrombosis Research
|January 14, 1999
PubMed
Summary

Physical factors like shear rate and duration significantly impact blood clot formation. Blood flow mechanics alone can trigger platelet aggregation and influence coagulation, crucial for understanding hemostasis and thrombosis.

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Fluid Dynamics

Background:

  • Platelet and coagulation factor activity is influenced by both physical and chemical factors.
  • Physical forces alone can induce platelet aggregation, independent of chemical stimuli.
  • Understanding these physical factors is key to comprehending thrombotic and hemostatic processes.

Purpose of the Study:

  • To investigate the influence of physical factors, specifically blood flow dynamics, on hemostasis and thrombosis.
  • To elucidate the role of shear rate, shear stress, and exposure duration in platelet and coagulation activation.
  • To explore how complex flow conditions in injured vessels affect clot formation.

Main Methods:

  • Utilized controlled shear devices (viscometers) to study physical influences on blood components.

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  • Employed well-defined perfusion chambers with parallel flow streamlines to analyze flow-related mechanisms.
  • Examined platelet aggregation and fibrin formation under varying shear conditions.

    • Main Results:

    • Increased shear rate enhances platelet attachment and aggregate growth under physiological conditions.
    • Elevated shear conditions inhibit fibrin production on tissue factor-exposed surfaces.
    • Platelet aggregate formation at high shear rates, similar to stenosed vessels, depends on exposure duration.

    Conclusions:

    • Blood flow mechanics, including shear rate and stress, are critical determinants of thrombotic and hemostatic mass formation.
    • Complex flow patterns in injured vessels, with varying shear rates, present unique challenges for hemostasis and thrombosis.
    • Further research into non-parallel flow situations is necessary to fully understand in vivo clot formation.