Multiscale modeling of blood flow and clotting in cardiovascular devices

心血管设备中血流和凝血的多尺度建模

• 批准号: 8114454
• 负责人: DANNY BLUESTEIN
• 金额: $ 19.07万
• 依托单位: STATE UNIVERSITY NEW YORK STONY BROOK
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-15 至 2013-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8114454
• 关键词: Adhesions; Adopted; Algorithms; Anticoagulants; Biochemical; Biology; Blood; Blood Clot; Blood Platelets; Blood coagulation; Blood flow; Cardiovascular Diseases; Cardiovascular system; Cells; Chronic; Clinical; Coagulation Process; Complex; Computing Methodologies; Couples; Coupling; Devices; Engineering; Event; Goals; Health Care Costs; Heart Valve Prosthesis; Hemorrhage; Hemostatic Agents; High Performance Computing; In Vitro; Kinetics; Knowledge; Length; Life; Life Expectancy; Liquid substance; Measurement; Mechanics; Medicine; Methodology; Modeling; Molecular; Numeric Rating Scale; Patients; Pattern; Platelet Activation; Platelet aggregation; Principal Investigator; Process; Quality of life; Reaction; Recording of previous events; Regimen; Research; Risk; Shapes; Solutions; Stimulus; Stress; Stroke; Surface; Therapeutic Embolization; Thromboembolism; Tissues; Translating; Trauma; advanced simulation; base; blood pump; computing resources; improved; innovation; interdisciplinary approach; molecular scale; mortality; multi-scale modeling; nanoscale; next generation; particle; programs; response; senescence; simulation; spatiotemporal; supercomputer; tool; ventricular assist device

DESCRIPTION (provided by applicant): The advent of implantable blood recirculating devices has provided life saving solutions to patients with severe cardiovascular diseases. Ventricular assist devices (VAD), blood pumps, and prosthetic heart valves (PHV) provide short to long term solutions for such patients. However, blood clots formation and the attendant risk for stroke remains an impediment to these devices. The complex life-long anticoagulant drug regimen they require, which induces vulnerability to hemorrhage and is not a viable therapy for some patients, does not eliminate this risk. Clot formation is potentiated by contact with foreign surfaces and the non-physiologic flow patterns that enhance the hemostatic response by chronically activating platelets. It is now recognized as the salient aspect of blood trauma in devices. We offer to develop state of the art multiscale numerical simulation methodology that will be able to predict and depict flow induced thrombogenicity in devices. Stresses induced by blood flow on platelets can be represented by a continuum mechanics models down to the order of the <m level. However, molecular effects of adhesion- aggregation bonds are on the order of nm. The coupling of such disparate spatiotemporal scales represents a major computational challenge. Our approach couples a macroscopic model that provides information about the flow induced stresses that may activate clotting, transmitted to a micro-to-nanoscale model based on Discrete Particle Dynamics (DPD) approach. This multi-scale model bridges the gap between macroscopic flow and the cellular scales by allowing the platelets to change their shape continuously in response to the mechanical stimuli. The project follows specific aims (1) develop a DPD model of flow induced thrombogenicity; incorporating biochemical and cellular reaction kinetics leading to platelet aggregation, clot formation and embolization. (2)Bridge the gap between macroscopic and molecular scales by incorporating this model into a multiscale model of flow-induced thrombogenicity, translating the stress dynamics to platelet associated biochemical and cellular events. (3) Validate DPD by comparing its predictions to computational fluid dynamics (CFD), and correlating its platelets activation and aggregation predictions to measurements in a blood recirculation loop. (4) Conduct error estimation and parameter sensitivity analysis, and optimize the computational efficiency across the scales in multi-cluster supercomputers. With extended life expectancy, increasing numbers of patients will require CVS devices. The vexing problem of device thrombogenicity calls for innovative approaches that couple biophysical and biochemical transport spanning the spatial and temporal scales. The tools developed in the proposed research are essential for optimizing the next generation of devices in order to reduce mortality rates and the ensuing healthcare costs, and improve patients' quality of life. Recent progress in computational methods and HPC has put such major challenges within our reach. The proposed methodology may stimulate the burgeoning field of multiscale simulations and its application to solving complex clinical problems at the interface of engineering and biology. It represents a paradigm shift in such simulations, advancing our understanding of biotransport processes to a new level that may have a major impact on important problems in biology and medicine. PHS 398/2590 (Rev. 06/09) Page 1 Continuation Format Page PUBLIC HEALTH RELEVANCE: Better understanding of the complex interactions between living tissues and mechanical stimuli, as represented by the vexing problem of flow-induced cardiovascular devices thrombogenicity, calls for innovative multidisciplinary approaches that couple biophysical and biochemical transport phenomena spanning the spatial and temporal scales. In this proposal a multi-scale modeling approach will be developed that will efficiently utilize high performance computing (HPC) resources. The knowledge that will be gained by the proposed research is essential for developing the next generation of devices that will reduce mortality rates, improve patients' quality of life, and reduce the ensuing healthcare costs. The innovative methodology that will be developed may stimulate the burgeoning field of multiscale simulations and its application to solving complex clinical problems at the interface of engineering and biology. It has the potential to advance our understanding of biotransport processes to a new level that will have a major impact on important problems in biology and medicine.

描述（由申请人提供）：植入式血液再循环装置的出现为患有严重心血管疾病的患者提供了挽救生命的解决方案。心室辅助装置（VAD）、血泵和人工心脏瓣膜（PHV）为此类患者提供短期到长期的解决方案。然而，血栓形成和伴随的中风风险仍然是这些装置的障碍。他们需要复杂的终身抗凝药物方案，这会导致出血的脆弱性，对某些患者来说不是一种可行的治疗方法，并不能消除这种风险。与异物表面接触以及通过长期激活血小板增强止血反应的非生理性流动模式可促进凝块形成。它现在被认为是器械中血液创伤的突出方面。我们提供开发最先进的多尺度数值模拟方法，该方法将能够预测和描述器械中的流动诱导血栓形成。血液流动对血小板产生的应力可以用连续介质力学模型来表示，直至<m级别的量级。然而，粘附-聚集键的分子效应在nm量级上。这种完全不同的时空尺度的耦合代表了一个主要的计算挑战。我们的方法耦合的宏观模型，提供有关的流动诱导的应力，可能会激活凝血，传输到基于离散粒子动力学（DPD）的方法的微米到纳米级模型的信息。该多尺度模型通过允许血小板响应于机械刺激而连续地改变其形状来弥合宏观流动与细胞尺度之间的差距。该项目遵循特定目标（1）开发流动诱导血栓形成的DPD模型;结合导致血小板聚集、凝块形成和栓塞的生化和细胞反应动力学。（2）通过将该模型结合到流动诱导的血栓形成的多尺度模型中，将应力动力学转化为血小板相关的生化和细胞事件，弥合宏观和分子尺度之间的差距。(3)通过将DPD的预测与计算流体动力学（CFD）进行比较，并将其血小板活化和聚集预测与血液再循环回路中的测量结果相关联，来验证DPD。(4)进行误差估计和参数敏感性分析，优化多集群超级计算机的跨尺度计算效率。 随着预期寿命的延长，越来越多的患者将需要CVS设备。装置血栓形成的棘手问题需要创新的方法，耦合生物物理和生物化学运输跨越空间和时间尺度。在拟议的研究中开发的工具对于优化下一代设备至关重要，以降低死亡率和随之而来的医疗成本，并提高患者的生活质量。计算方法和HPC的最新进展使我们能够应对这些重大挑战。所提出的方法可能会刺激新兴领域的多尺度模拟及其应用，以解决复杂的临床问题，在工程和生物学的接口。它代表了这种模拟的范式转变，将我们对生物运输过程的理解推进到一个新的水平，可能对生物学和医学中的重要问题产生重大影响。PHS 398/2590（Rev. 06/09）第1页 公共卫生关系：更好地了解复杂的活组织和机械刺激之间的相互作用，所代表的棘手问题的流动诱导心血管装置血栓形成，要求创新的多学科方法，耦合生物物理和生化运输现象跨越空间和时间尺度。在本提案中，将开发一种多尺度建模方法，该方法将有效地利用高性能计算（HPC）资源。通过拟议研究获得的知识对于开发下一代设备至关重要，这些设备将降低死亡率，改善患者的生活质量，并降低随之而来的医疗成本。将开发的创新方法可能会刺激新兴的多尺度模拟领域及其在工程和生物学界面上解决复杂临床问题的应用。它有可能将我们对生物运输过程的理解提升到一个新的水平，这将对生物学和医学中的重要问题产生重大影响。