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Ramifications of Vorticity on Aggregation and Activation of Platelets in Bi-Leaflet Mechanical Heart Valve: Fluid-Structure-Interaction Study.
Ahmed, Meraj; Gupta, Nirmal; Jana, Rashmoni; Das, Malay K; Kar, Kamal K.
Afiliación
  • Ahmed M; Advanced Nanoengineering Materials Laboratory, Department of Mechanical Engineering, IIT-Kanpur, Kanpur, UP 208016, India.
  • Gupta N; Department of Cardiovascular and Thoracic Surgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, UP 226014, India.
  • Jana R; Department of Anatomy, Vardhman Mahavir Medical College and Safdarjung Hospital (VMMC and SJH), New Delhi 110029, India.
  • Das MK; Department of Mechanical Engineering, IIT-Kanpur, Kanpur, UP 208016, India.
  • Kar KK; Advanced Nanoengineering Materials Laboratory, Department of Mechanical Engineering, IIT-Kanpur, Kanpur, UP 208016, India; Advanced Nanoengineering Materials Laboratory, Materials Science Program, IIT-Kanpur, Kanpur, UP 208016, India.
J Biomech Eng ; 144(8)2022 08 01.
Article en En | MEDLINE | ID: mdl-35079764
Bileaflet mechanical heart valves (BMHV) are widely implanted to replace diseased heart valves. Despite many improvements in design, these valves still suffer from various complications, such as valve dysfunction, tissue overgrowth, hemolysis, and thromboembolism. Thrombosis and thromboembolism are believed to be initiated by platelet activation due to contact with foreign surfaces and nonphysiological flow patterns. The implantation of the valve causes nonphysiological patterns of vortex shedding behind the leaflets. This study signifies the importance of vorticity in platelet activation and aggregation in BMHV implants. A two-phase model with the first Eulerian phase for blood and the second discrete phase for platelets is used here. The generalized cross model of viscosity has been used to simulate the non-Newtonian viscosity of blood. A fluid-structure-interaction model has been used to simulate the motion of leaflets. This study has also estimated the platelet activation state (PAS), which is the mathematical estimation of the degree of activation of platelets due to flow-induced shear stresses that cause thrombus formation. The regions in the fluid domain with a higher vorticity field have been found to contain platelets with relatively higher PAS than regions with relatively lower vorticity fields. Also, this study has quantitatively reported the effect of vorticity on platelet aggregation. Platelet densities in fluid areas with higher vorticity are higher than densities in fluid areas with lower vorticity, indicating that highly activated platelets aggregate in areas with stronger vorticity.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tromboembolia / Trombosis / Prótesis Valvulares Cardíacas Límite: Humans Idioma: En Revista: J Biomech Eng Año: 2022 Tipo del documento: Article País de afiliación: India Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tromboembolia / Trombosis / Prótesis Valvulares Cardíacas Límite: Humans Idioma: En Revista: J Biomech Eng Año: 2022 Tipo del documento: Article País de afiliación: India Pais de publicación: Estados Unidos