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Computational Modeling and Analysis of Hemodynamic Effects of Diastolic Heart Dysfunction During the Whole Cardiac Cycle

[+] Author Affiliations
Xudong Zheng, Qian Xue

University of Maine, Orono, ME

Rajat Mittal

Johns Hopkins University, Baltimore, MD

Paper No. SBC2013-14050, pp. V01AT19A001; 2 pages
doi:10.1115/SBC2013-14050
From:
  • ASME 2013 Summer Bioengineering Conference
  • Volume 1A: Abdominal Aortic Aneurysms; Active and Reactive Soft Matter; Atherosclerosis; BioFluid Mechanics; Education; Biotransport Phenomena; Bone, Joint and Spine Mechanics; Brain Injury; Cardiac Mechanics; Cardiovascular Devices, Fluids and Imaging; Cartilage and Disc Mechanics; Cell and Tissue Engineering; Cerebral Aneurysms; Computational Biofluid Dynamics; Device Design, Human Dynamics, and Rehabilitation; Drug Delivery and Disease Treatment; Engineered Cellular Environments
  • Sunriver, Oregon, USA, June 26–29, 2013
  • Conference Sponsors: Bioengineering Division
  • ISBN: 978-0-7918-5560-7
  • Copyright © 2013 by ASME

abstract

Diastolic heart dysfunction (DHD) is a common finding in a variety of cardiac diseases including hypertension, coronary disease and cardiomyopathy. Its prevalence increases with age and it manifests as incomplete or/and delayed ventricular relaxation and a compensatory stronger atrial contraction. DHD is often associated with heart failure and contributes greatly to morbidity and hospitalizations especially in the elderly[3]. DHD is a very rich problem in fluid mechanics and it involves complex hemodynamic interactions among all of major cardiac phases during the whole cardiac cycle including ventricular filling, diastatsis, atrial filling, and systole[1]. Most studies to-date have, however, employed simple time varying volume-change profiles to model and examine the dynamics of ventricular filling[2]. Intercardiac flow effects i.e. interaction between filling and ejection have, however, not been investigated in detail. Also not studied in detail is the role of multiphasic filling which consists of early (E) filling, diastasis, and atrial (A) filling. In the current study, we will utilize three dimensional simulations to study the hemodynamics of DHD during the whole cardiac cycle. The vortex structure, filling velocity, intraventricular pressure gradient and energy budget will be analyzed to uncover the biomechanical effects and genesis of DHD.

Copyright © 2013 by ASME

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