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An Approach to Study Shape-Dependent Transcriptomics at a Single Cell Level
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Left-ventricular shape determines intramyocardial mechanical heterogeneity.

Hon Fai Choi1, Frank E Rademakers, Piet Claus

  • 1Division Imaging and Cardiovascular Dynamics, Department of Cardiovascular Diseases, Katholieke Universiteit Leuven, University Hospitals–Campus Gasthuisberg, Belgium.

American Journal of Physiology. Heart and Circulatory Physiology
|September 28, 2011
PubMed
Summary

Left-ventricular shape significantly impacts heart mechanics. Changes in shape, particularly increased sphericity, reduce ejection performance by altering stress and strain within the heart muscle.

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Area of Science:

  • Cardiovascular Physiology
  • Computational Biology
  • Biomedical Engineering

Background:

  • Left-ventricular remodeling is a key factor in heart disease progression and mechanical dysfunction.
  • The precise relationship between left-ventricular shape changes and impaired cardiac function remains unclear.
  • Understanding this interaction is crucial for developing effective therapeutic strategies.

Purpose of the Study:

  • To investigate the influence of left-ventricular shape on systolic mechanical function using computational modeling.
  • To determine how variations in left-ventricular geometry affect intramyocardial stress, strain, and work density.

Main Methods:

  • Finite-element models of the left ventricle were created with shapes ranging from ellipsoidal to spherical.
  • A realistic transmural gradient of fiber orientation was incorporated.
  • Passive material properties and myocyte activation/contraction models were employed to simulate cardiac function during filling and ejection.

Main Results:

  • Intramyocardial distributions of fiber stress, strain, and stroke work density were found to be dependent on left-ventricular shape.
  • Increasing sphericity of the left ventricle led to reduced ejection performance.
  • This reduction was associated with decreased active fiber stress, shortening, and work in the midwall and subepicardial regions.

Conclusions:

  • A significant interaction exists between left-ventricular shape and regional myofiber mechanics.
  • Left-ventricular shape alterations play a critical role in systolic dysfunction.
  • Further research is needed to fully elucidate the importance of these findings in the context of left-ventricular remodeling.