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Modeling Clot Formation of Shear-Injured Platelets in Flow by a Dissipative Particle Dynamics Method

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Abstract

The regions with high non-physiological shear stresses (NPSS) are inevitable in blood-contacting medical devices (BCMDs) used for mechanically assisted circulatory support. NPSS can cause platelet activation and receptor shedding potentially resulting in the alteration of hemostatic function. In this study, we developed a dissipative particle dynamics model to characterize clot formation (platelet–collagen and inter-platelet adhesion) of NPSS-traumatized blood at a vascular injury site. A rectangular tube of 50 × 50 × 200 µm with an 8 × 8 µm collagen-coated area was modeled as a small blood vessel and perfusion with blood. Clot formation dynamics during perfusion was simulated. NPSS-traumatized blood was modeled to have more activated platelet and fewer adhesion receptors with weakened inter-platelet binding. Computational results showed that clots grew at a faster rate while the structure of the clots was less stable and collapsed more frequently for NPSS-traumatized blood compared with normal blood. The finding that NPSS-traumatized platelets could result in quicker but more easily breakable blood clots at injury sites may explain why increased risks of thrombotic and bleeding complications occurred concurrently in patients implanted with BCMDs.

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Acknowledgements

Research reported in this publication was partially supported by the National Heart, Lung, and Blood Institute of the National Institutes of Health (Award Nos. R01HL124170, R01HL131750). Liwei Wang was supported by the National Key Research and Development Program of China (Award Nos. 2017YFC0111100, 2016YFC1100300), National Natural Science Foundation of China (Award No. 11972215), and a Tsinghua Scholarship for Overseas Graduate Studies.

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Correspondence to Zhongjun J. Wu.

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Wang, L., Chen, Z., Zhang, J. et al. Modeling Clot Formation of Shear-Injured Platelets in Flow by a Dissipative Particle Dynamics Method. Bull Math Biol 82, 83 (2020). https://doi.org/10.1007/s11538-020-00760-9

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  • DOI: https://doi.org/10.1007/s11538-020-00760-9

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