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Related Experiment Video

Updated: Nov 9, 2025

Intravascular Ultrasound Image-Based Finite Element Modeling Approach for Quantifying In Vivo Mechanical Properties of Human Coronary Artery
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Inverse modeling framework for characterizing patient-specific microstructural changes in the pulmonary arteries.

Reza Pourmodheji1, Zhenxiang Jiang1, Christopher Tossas-Betancourt2

  • 1Department of Mechanical Engineering, Michigan State University, East Lansing, MI, USA.

Journal of the Mechanical Behavior of Biomedical Materials
|April 9, 2021
PubMed
Summary

Pulmonary arterial hypertension (PAH) significantly alters pulmonary artery mechanics. Our study reveals elastin is key, bearing higher stress and stiffness in PAH patients compared to controls.

Keywords:
Inverse finite elementPulmonary arterial hypertensionPulmonary vascular stiffnessVascular remodeling

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Area of Science:

  • Cardiovascular Research
  • Biomedical Engineering
  • Pulmonary Medicine

Background:

  • Pulmonary arterial hypertension (PAH) involves poorly understood microstructural changes in pulmonary arteries.
  • Characterizing these changes in humans is crucial for understanding PAH.
  • Existing models lack patient-specific mechanical and structural insights.

Purpose of the Study:

  • To develop and apply a patient-specific inverse finite element (FE) modeling framework.
  • To characterize mechanical and structural changes in pulmonary artery micro-constituents.
  • To compare these changes between a pediatric PAH patient and a healthy control.

Main Methods:

  • Utilized in-vivo pressure measurements and magnetic resonance imaging.
  • Employed a constrained mixture model to optimize tissue parameters (elastin, collagen, smooth muscle cells).
  • Fitted patient-specific pressure-diameter responses of the main pulmonary artery.

Main Results:

  • Aggregated stress resultant and stiffness were 4.6 and 3.4 times higher in the PAH patient, respectively.
  • Individual stress and stiffness resultants for elastin, smooth muscle cells, and collagen fibers were elevated in the PAH patient.
  • Elastin exhibited the highest mean stress resultant in both PAH and control subjects.

Conclusions:

  • Patient-specific FE modeling can characterize pulmonary artery microstructural and mechanical changes in PAH.
  • Elastin appears to be the primary load-bearing component in pulmonary arteries for both healthy individuals and PAH patients.
  • Elevated stress and stiffness in pulmonary artery constituents are hallmarks of PAH.