Estimating passive mechanical properties in a myocardial infarction using MRI and finite element simulations

Dimitri Mojsejenko, Jeremy R. McGarvey, Shauna M. Dorsey, Joseph H. Gorman, Jason A. Burdick, James J. Pilla, Robert C. Gorman, Jonathan F. Wenk

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Myocardial infarction (MI) triggers a series of maladaptive events that lead to structural and functional changes in the left ventricle. It is crucial to better understand the progression of adverse remodeling, in order to develop effective treatment. In addition, being able to assess changes in vivo would be a powerful tool in the clinic. The goal of the current study is to quantify the in vivo material properties of infarcted and remote myocardium 1 week after MI, as well as the orientation of collagen fibers in the infarct. This will be accomplished by using a combination of magnetic resonance imaging (MRI), catheterization, finite element modeling, and numerical optimization to analyze a porcine model ($$N = 4$$N=4) of posterolateral myocardial infarction. Specifically, properties will be determined by minimizing the difference between in vivo strains and volume calculated from MRI and finite element model predicted strains and volume. The results indicate that the infarct region is stiffer than the remote region and that the infarct collagen fibers become more circumferentially oriented 1 week post-MI. These findings are consistent with previous studies, which employed ex vivo techniques. The proposed methodology will ultimately provide a means of predicting remote and infarct mechanical properties in vivo at any time point post-MI.

Original languageEnglish
Pages (from-to)633-647
Number of pages15
JournalBiomechanics and Modeling in Mechanobiology
Volume14
Issue number3
DOIs
StatePublished - Jun 15 2015

Bibliographical note

Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.

Keywords

  • Finite element modeling
  • Left ventricular remodeling
  • MRI
  • Myocardial infarction
  • Optimization

ASJC Scopus subject areas

  • Biotechnology
  • Modeling and Simulation
  • Mechanical Engineering

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