Computational modeling of volumetric soft tissue growth: application to the cardiac left ventricle

Biomech Model Mechanobiol. 2009 Aug;8(4):301-9. doi: 10.1007/s10237-008-0136-z. Epub 2008 Aug 30.

Abstract

As an initial step to investigate stimulus-response relations in growth and remodeling (G&R) of cardiac tissue, this study aims to develop a method to simulate 3D-inhomogeneous volumetric growth. Growth is regarded as a deformation that is decomposed into a plastic component which describes unconstrained growth and an elastic component to satisfy continuity of the tissue after growth. In current growth models, a single reference configuration is used that remains fixed throughout the entire growth process. However, considering continuous turnover to occur together with growth, such a fixed reference is unlikely to exist in reality. Therefore, we investigated the effect of tissue turnover on growth by incrementally updating the reference configuration. With both a fixed reference and an updated reference, strain-induced cardiac growth in magnitude of 30% could be simulated. However, with an updated reference, the amplitude of the stimulus for growth decreased over time, whereas with a fixed reference this amplitude increased. We conclude that, when modeling volumetric growth, the choice of the reference configuration is of great importance for the computed growth.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomechanical Phenomena
  • Computer Simulation
  • Finite Element Analysis
  • Growth
  • Heart Ventricles / anatomy & histology*
  • Humans
  • Models, Anatomic
  • Models, Biological
  • Models, Cardiovascular
  • Models, Statistical
  • Myocardium / pathology
  • Software
  • Stress, Mechanical
  • Time Factors