Finite Element Analysis of Tricuspid Valve Deformation from Multi-slice Computed Tomography Images

  • Fanwei Kong
  • Thuy Pham
  • Caitlin Martin
  • Raymond McKay
  • Charles Primiano
  • Sabet Hashim
  • Susheel Kodali
  • Wei Sun
Article
  • 7 Downloads

Abstract

Despite the growing clinical interest in the tricuspid valve (TV), there is an incomplete understanding of TV biomechanics which is important in normal TV function and successful TV repair techniques. Computational models with patient-specific human TV geometries can provide a quantitative understanding of TV biomechanic. Therefore, this study aimed to develop finite element (FE) models of human TVs from multi-slice computed tomography (MSCT) images to investigate chordal forces and leaflet stresses and strains. Three FE models were constructed for human subjects with healthy TVs from MSCT images and incorporated detailed leaflet geometries, realistic nonlinear anisotropic hyperelastic material properties of human TV, and physiological boundary conditions tracked from MSCT images. TV closure from diastole to systole was simulated. Chordal lengths were iteratively adjusted until the simulated TV geometries were in good agreement with the “true” geometries reconstructed from MSCT images at systole. Larger chordal forces were found on the strut (or basal) chords than on the rough zone chords and the total forces applied on the anterior papillary muscles by the strut chords were higher than those on the posterior or septal papillary muscles. At peak systolic pressure, the average maximum stress on the middle sections of the leaflets ranged from 30 to 90 kPa, while the average maximum principal strain values ranged from 0.16 to 0.30. The results from healthy TVs can serve as baseline biomechanical metrics of TV mechanics and may be used to inform TV repair device design. The computational approach developed could be one step towards developing computational models that may support pre-operative planning in complex TV repair procedures in the future.

Keywords

Multi-slice computed tomography Tricuspid valve Finite element analysis Patient-specific geometries Biomechanics 

Notes

Acknowledgment

Research for this project was funded in part by NIH HL104080 and HL127570 Grants. The authors would like to thank Erica Shin for tissue mechanical testing of TV tissues.

Disclosures

The authors declare that they have no conflict of interest.

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Copyright information

© Biomedical Engineering Society 2018

Authors and Affiliations

  1. 1.The Wallace H. Coulter Department of Biomedical EngineeringGeorgia Institute of Technology and Emory UniversityAtlantaUSA
  2. 2.Cardiology and Cardiac SurgeryThe Hartford HospitalHartfordUSA
  3. 3.Structural Heart & Valve CenterColumbia University Medical CenterNew YorkUSA
  4. 4.The Wallace H. Coulter Department of Biomedical EngineeringGeorgia Institute of Technology and Emory UniversityAtlantaUSA

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