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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
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Using microfluidic devices to study thrombosis in pathological blood flows.

Bradley A Herbig1, Xinren Yu1, Scott L Diamond1

  • 1Department of Chemical and Biomolecular Engineering, Institute for Medicine and Engineering, 1024 Vagelos Research Laboratory, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

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Summary
This summary is machine-generated.

Microfluidic devices simulate extreme blood flow conditions, revealing how von Willebrand Factor (VWF) and neutrophil NETosis contribute to disease-related thrombotic events.

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Hematology

Background:

  • Pathological blood flow in diseased vessels or assist devices causes thrombotic issues.
  • Microfluidics can replicate extreme flow conditions like elongational flow and high shear stress, which are difficult to achieve in traditional setups.

Purpose of the Study:

  • To review microfluidic devices designed to study pathological blood flow.
  • To investigate the mechanisms of thrombosis and clot formation under various flow conditions.

Main Methods:

  • Utilized microfluidic devices including extreme stenosis channels, micropost-impingement systems, and stagnation-point devices.
  • Simulated conditions such as plasma flow over collagen, flow impinging on microposts, and blood flow over procoagulant surfaces.
  • Investigated clot architecture and neutrophil responses within occlusive clots.

Main Results:

  • Observed elongation and assembly of plasma von Willebrand Factor (VWF) on collagen in stenosis channels.
  • Demonstrated VWF bundle growth around microposts due to elongational and shear stresses.
  • Characterized clots formed at stagnation points with a core-shell architecture.
  • Showed that Darcy flow in occlusive clots can drive neutrophil NETosis independently of thrombin or fibrin.

Conclusions:

  • Microfluidic devices provide powerful tools to access and study physical environments relevant to human diseases.
  • These devices enable detailed investigation of flow-induced thrombosis and cellular responses in a controlled manner.