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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
Published on: February 14, 2017
Micro-scale dynamic simulation of erythrocyte-platelet interaction in blood flow
T AlMomani1, H S Udaykumar, J S Marshall
1Department of Biomedical Engineering, 1402 SC, College of Engineering, University of Iowa, Iowa City, IA 52242-1527, USA.
Annals of Biomedical Engineering
|March 12, 2008
Summary
Platelet-red blood cell interactions in blood flow are crucial for understanding thrombus formation. Simulations show hydrodynamic forces, not collisions, drive platelet margination, increasing with hematocrit.
Area of Science:
- Biomedical Engineering
- Computational Fluid Dynamics
- Hematology
Background:
- Platelet activation, adhesion, and aggregation contribute to mural thrombi formation on blood vessels and implants.
- Erythrocyte (RBC) dynamics significantly influence platelet behavior, especially in small vessels and constricted flow regions.
- Accurate modeling of platelet motion requires accounting for platelet-erythrocyte interactions.
Purpose of the Study:
- To investigate platelet-red blood cell (RBC) interactions in shear flows using computational fluid dynamics (CFD).
- To analyze the impact of RBCs on platelet migration, activation, and aggregation dynamics.
- To explore the relationship between fluid forces, hematocrit, and platelet behavior in cardiovascular flow.
Main Methods:
- Utilized a level-set sharp-interface immersed boundary method for micro-scale dynamics simulations.
- Modeled RBCs as deformable elliptical particles and platelets as rigid circular particles.
- Employed an extended soft-sphere model to simulate forces and torques during cell collisions.
Main Results:
- Platelet migration toward vessel walls (margination) was enhanced with increasing hematocrit.
- Hydrodynamic forces, rather than collisional forces or volumetric exclusion, were identified as the primary drivers of margination.
- Fluid shear forces on platelets exhibited an exponential increase with hematocrit within the studied parameter range.
Conclusions:
- Platelet-RBC interactions are critical for predicting platelet dynamics and thrombus formation.
- Hydrodynamic forces play a dominant role in platelet margination, influenced by hematocrit.
- Micro-scale CFD analysis offers a pathway to deterministically link fluid forces to platelet activation and aggregation in cardiovascular flows.
